2007 NORTHEASTERN NATURALIST 14(4):545–570
Mannahatta: An Ecological First Look at the Manhattan
Landscape Prior to Henry Hudson
Eric W. Sanderson1,* and Marianne Brown2
Abstract - The British Headquarters Map, circa 1782, provides a remarkable window
onto the natural topography, hydrology, and land cover of Manhattan Island,
NY, before extensive urbanization. Manhattan formerly hosted a rugged topography
watered by over 108 km of streams and at least 21 ponds, fl owing in and out
of wetlands that covered nearly 10% of the island in the late 18th century. These
features are largely representative of the landscape prior to European settlement.
We used ecological features interpreted from the British Headquarters Map, and additional
historical, ecological, and archeological information, to hypothesize about
the ecosystem composition of the pre-European island. We suggest that 54 different
ecological communities may have once been found on the island or in nearby waters,
including chestnut-tulip tree forests, Hempstead Plains grasslands, freshwater and
tidal marshes, hardwood swamps, peatlands, rocky headwater streams, coastal-plain
ponds, eelgrass meadows, and culturally derived ecosystems, such as Native American
village sites and fi elds. This former ecosystem mosaic, consisting of over 99%
natural areas, stands in sharp contrast to the 21st-century state of the island in which
only 3% of its area is dedicated to ecological management.
Introduction
To students of the natural history of New York City, an interest in the
past ecology of the local region is almost inevitable because the modern
cityscape is so markedly different from the historical landscape (Hornaday
1909, Kieran 1959, Shorto, 2004). Although striking remnants of tidal wetlands
and upland forests remain, these fragments just hint at the remarkably
abundant natural environment in which this archetypical city has been constructed
(Barlow 1969). Early Dutch and English accounts overfl ow with
fantastic descriptions of the abundant wildlife, magnifi cent park-like forests,
and extensive marshlands of Manhattan Island and neighboring areas
(Table 1). Unfortunately, nearly 400 years of development have rendered
this earlier abundance as diffi cult to imagine to us as perhaps our modern
roads, skyscrapers, and wealth would be to those fi rst European colonists
and their Native American neighbors.
Fortunately, the past natural communities of Manhattan Island are not
totally lost, as a combination of historical resources, ecological understanding,
and modern geographic tools can be applied to the rich ecological and
historical research resources of New York to understand the past natural
1Living Landscapes Program, Wildlife Conservation Society, 2300 Southern Boulevard,
Bronx, NY 10460. 2Department of Geography, Hunter College, City University
of New York, 696 Park Avenue, New York, NY 10021. *Corresponding author - esanderson@
wcs.org.
546 Northeastern Naturalist Vol. 14, No. 4
Table 1. Selected 17th-century descriptions of Manhattan Island from Dutch, French, and English
sources. Translations are reprinted from Jameson (1909). Notes in brackets are provided
by the authors. Year = year described.
Description Year Source
“When I came on shore, the swarthy natives all stood and sang
in their fashion. Their clothing consists of the skins of foxes and
other animals, which they dress and make garments from skins
of various sorts. Their food is Turkish wheat [maize], which they
cook by baking, and is excellent eating…. It is as pleasant a land
as one can tread upon, very abundant in all kinds of timber suitable
for ship-building, and for making large casks.”
1609 Henry Hudson,
quoted by De
Laet (1625)
“…and hard by it there was a Cliffe, that looked of the colour of
a white greene, as though it were either Copper, or Silver myne:
and I thinke it to be one of them, by the Trees that grow upon it.
For they be all burned, and the other places are greene as grasse,
it is on the side of the River that is called Manna-hata.”
1609 Juet (1610)
“On this river there is a great traffi ck in the skins of beavers,
otters, foxes, bears, minks, wild cats, and the like. The land
is excellent and agreeable full of noble forest trees and grape
vines, and nothing is wanting but the labor and industry of man
to render it one of the fi nest and most fruitful lands in that part
of the world.”
1624 De Laet (1625)
“The island of Manhatas extends two leagues in length along
the Mauritse River [Hudson River], from the point where the
Fort “New Amsterdam” is building. It is about seven leagues
in circumferance, full of trees, and in the middle rocky to the
extent of two leagues in circuit. The north side has good land
in two places, where two farmers, each with four horses, would
have enough to do without much clearing at fi rst. The grass is
good in the forest and valleys, but when made into hay is not so
nutritious for cattle as here [in Holland], in consequence of its
wild state, but it yearly improves by cultivation. On the east side
there rises a large level fi eld, of from 70 to 80 morgens of land
[140–160 acres], through which runs a very fi ne fresh stream; so
that land can be ploughed without much clearing. It appears to
be good….” (p. 104)
1626 De Rasieres
(1628?)
”I began to make a plantation, a league and a half or two leagues
above the fort [New Amsterdam, the plantation was probably in
Harlem], as there was there a fi ne location, and full thirty-one
morgens [62 acres] of maize-land, where there were no trees
to remove; and hay-land lying all together, suffi cient for two
hundred cattle, which is a great commodity there. I went there to
live, half on account of the pleasure of it, as it was all situated
along the river.”
1640 De Vries (1655)
“The fi rst comers found lands fi t for use, deserted by the savages,
who formerly had fi elds here. Those who came later have
cleared the woods, which are mostly oak. The soil is good. Deer
hunting is abundant in the fall. There are some houses built of
stone; lime they make of oyster shells, great heaps of which are
found there, made formerly by the savages, who subsist in part
by that fi shery.”
1643 Jogues (1646)
2007 E.W. Sanderson and M. Brown 547
environment. The Mannahatta Project (www.wcs.org/mannahatta) is an
effort to document, through historical research and ecological modelling,
the Manhattan landscape immediately prior to Henry Hudson’s arrival on
September 12, 1609. Our hope is that by providing a vivid, ecologically
sound, geographically referenced reconstruction of Mannahatta (the Native
American name for the island), we can encourage interest in conservation of
wild places and wildlife in the city, in the Northeast, and abroad.
This project would not be possible were it not for the existence of the
British Headquarters Map from the British occupation of New York during
the American Revolution (Fig. 1). Through most of the war, the British worried
that George Washington’s Continental Army would attempt to re-take
the city after its retreat in 1776. Although this attack never materialized,
planning for this contingency led to the creation of the British Headquarters
Map of approximately 1782 (the date and exact authorship are uncertain),
now held in The National Archives in London and recently published for the
fi rst time in color (Cohen and Augustyn 1997).
British Army cartographers documented features of military interest at a
fi ne scale: hills and valleys, watercourses, ponds, wetlands, beaches, and the
shoreline, as well as an extensive network of roads, fortifi cations, orchards,
and farmlands, and a scattering of buildings north of New York City, which
at that time reached just beyond the modern City Hall Park. Many of these
same features, particularly the topography, watercourses, wetlands, and
shoreline, are also of ecological interest, providing information on landscape
drivers of the ecosystem mosaic (Forman 1995). Although created for military
reasons, the British Headquarters Map’s ultimate value may be found in
landscape ecology.
The representation of the natural features of Manhattan at the end of
the Revolution is particularly noteworthy because soon after the landscape
would be significantly altered. In the years following the Revolution, New
York blossomed from a small colonial town into a major city, particularly
after the opening of the Erie Canal in 1825, making New York the primary
port for goods traveling between the Midwest and Europe (Burrows and
Wallace 1999). As the city developed northward, expanding along a rectangular
grid according to the Commissioner’s Plan of 1811 (Cohen and
Augustyn 1997), hills were leveled, valleys filled, and streams diverted
into sewers; new buildings, streets, and infrastructure were continually
being constructed to support the growing population. Manhattan’s population
swelled throughout the 19th century, from a little over 33,000 people
in 1790 to over 1.4 million by 1890, as new economic wealth created jobs
and opportunities for millions of European immigrants (Kantrowitz 1995).
This rapid expansion led some New Yorkers to worry about the loss of
open space that only 50 years earlier had been available in abundance. William
Cullen Bryant and Horace Greeley, among others, led the charge to
create Central Park on rocky and swampy lands in the middle of the island
(Rosenzweig and Blackmar 1992); other parks were left where the land
548 Northeastern Naturalist Vol. 14, No. 4
Figure 1. The British Headquarters Map, circa 1782 (left image), in contrast with
modern aerial photography of New York City, circa 1998 (right image). Insets A and
B show details of the British Headquarters Map.
2007 E.W. Sanderson and M. Brown 549
was too steep to build on (Marcus Garvey Park, Morningside Heights Park,
High Bridge Park). By the time the Greater City of New York was formed
in 1898, nearly all of Manhattan, save the Inwood neighborhood at the
northern end of the island, had been allocated to buildings, streets, factories,
rail yards, cemeteries, and other intensive land uses (Burrows and
Wallace 1999). The 20th century saw the famous skyscrapers of Manhattan
rise above what were once leafy hills, and Robert Moses’ expressways
wrap the shore over the once sandy beaches. (Fig. 1).
The Mannahatta Project is not the first attempt to map the “primeval”
island. Egbert Viele in 1865 and Townsend MacCoun in 1909 created
maps of the pre-development landscape, which civil engineers have subsequently
praised for their accuracy in charting lost streams (Koeppel
2000). Unfortunately it appears that neither of these early cartographers
had access to the British Headquarters Map, which in Robert Augustyn’s
words “could have suggested schemes of development in greater harmony
with the area’s natural characteristics than the rigid grid plan that was
adopted” (Cohen and Augustyn 1997). It is just such schemes of development
in harmony with nature that we hope the city will adopt over its next
four hundred years.
The objectives of this paper are to summarize what we currently understand
about the ecological community (ecosystem) composition of
Manhattan in 1609, based on interpretation of the British Headquarters
Map in the context of other ecological (including palynological), archaeological,
and historical evidence. Our use of the British Headquarters Map
and comparison to modern GIS data for the city also allow us to describe
how the ecosystem composition of the island has changed through time and
thus, in effect, to do a retrospective land-cover analysis over 400 years of
Manhattan’s history. Finally we summarize the distributional factors that
will allow us in the future to begin mapping the distribution of Manhattan’s
former ecosystem mosaic and compare it to the modern city.
Methods
The British Headquarters Map, circa 1782
The British Headquarters Map was drawn and colored in pen, ink, and
watercolor on paper, 95.25 cm (37.5 inches) wide and 317.5 cm (125 inches)
long, resulting in a scale of 6.5 inches for 1 mile (approximately 1:10,000)
(Penfold 1974). The original map was drawn on two pieces of paper, which
have been attached together, after previously being folded. A limited edition
reproduction of the British Headquarters Map was published by B.F.
Stevens in 1900, but does not show all the same details as on the manuscript
map. An earlier draft of the map is also available (Penfold 1974). There is
no documented evidence linking this map to the actual British Headquarters
in Manhattan during the American Revolution; Stevens (1900) gave it that
name on supposition.
550 Northeastern Naturalist Vol. 14, No. 4
Conversion to geographic information system data
The British Headquarters Map was scanned in color at 600 dpi from three
separate plates in Cohen and Augustyn (1997) using a HP ScanJet 5300C
scanner (Hewlett-Packard Company, Menlo Park, CA) and then reassembled
by matching overlapping features from the three plates. In the process of
reassembling the map, we discovered that the map reproduced by Cohen and
Augustyn (1997) was itself not assembled correctly from the original two
mapsheets. Close examination of the Cohen and Augustyn plate shows that
the two sheets should have been matched along a dotted, diagonal line rather
than straight across the island. As reproduced in the book, the “E” in the label
for the East River appears to be misplaced with respect to the remaining
letters. We were able to correct this problem by splitting one of the scanned
images and aligning it properly.
The reassembled scanned image was georeferenced to a modern coordinate
system (Universal Transverse Mercator, zone 18) by finding a series
of points on the map which are still extant in the modern New York City
landscape and obtaining their geographic coordinates using a handheld
GPS unit (Garmin 12XL, Garmin International Inc., Olathe, KS), with a
nominal positional accuracy of approximately 15 m. Rectification was accomplished
using the ImageWarp extension (McVay 1998) to Arcview GIS,
version 3.2 (Environmental Systems Research Institute, Redlands, CA).
To verify the accuracy of this georeferencing, we compared other features
visible on the map to their modern locations, based on contemporary geographic
data (see below).
We digitized features from the rectifi ed British Headquarters Map by
hand at 1:5000 scale. We were able to recognize the following features:
shoreline, streams, ponds, wetlands, beaches, and upland areas (Fig. 2).
In addition, numerous human modifi cations of the landscape were visible,
including roads, fortifi cations (both batteries and walls), fi elds, orchards,
manors, bridges, and individual buildings. An urban land-cover classifi cation,
indicated in light pink in lower Manhattan, estimated the extent of the
built city at that time. Areas of various features were measured to the nearest
10 m2, and lengths to the nearest 10 m.
Hydrological features represented as polygons with discernable
width at the 1:5000 scale were digitized as polygons and identified as
either ponds or part of watercourses. All other hydrologic features (e.g.,
upland streams) were digitized as lines. In combining the land-cover
data with the hydrology, we buffered all the linear watercourses with a
1-m buffer as a crude approximation of the riparian area directly influenced
by the stream.
Wetlands immediately adjacent to the shoreline were coded as salt or
brackish wetlands. Marshes not adjacent to the shoreline were coded as
freshwater wetlands. In practice, these estuarine (salt) and palustrine (fresh)
ecosystems graded into one another along the line of mean high tide.
2007 E.W. Sanderson and M. Brown 551
The scope of the Mannahatta Project includes the near-shore waters in
New York harbor and the Hudson, East, and Harlem rivers, as well as adjacent
Governor’s Island and Roosevelt Island. We buffered 100 m from the
shoreline shown on the British Headquarters Map to create the study extent
for this paper.
Figure 2. Natural features of Manhattan Island and the extent of New York City
interpreted from the British Headquarters Map, circa 1782. Selected features are
labeled with their 18th-century names; see text for details. Inset map shows features
from central Manhattan at fi ner resolution. The inset map shows the central part of
the island, including parts of the modern day Upper West Side, Upper East Side,
Harlem, and northern Central Park.
552 Northeastern Naturalist Vol. 14, No. 4
Ecosystems of pre-European Manahatta
Although the British Headquarters Map does not provide exact information
on the ecosystem types that once clothed the island, it does provide
some direct and indirect indications relating to the former ecosystem mosaic.
The boundary between salt and fresh water, the paths and sizes of hydrological
features and topographic relief, and the distribution of wetlands, are all
major factors infl uencing the types and locations of ecosystems that can be
read directly from the map. Selected wooded areas on the map are indicated
with small trees with either rounded or triangular tops, indicating broadleaf
or conifer trees, respectively, although by the time this map was drawn, most
of Manhattan had been deforested.
Table 2. Estimated land-cover distribution on Manhattan Island, A. circa 1609, B. circa 1782,
and C. circa 2004.
Land-cover type Area (ha) % total
A. 1609
Human-dedicated areas
Agricultural fi elds ≈4 less than 1%
Habitation sites ≈1 less than 1%
Human-dedicated areas subtotal 5 0.1%
Natural areas
Forest and shrub 3692 77%
Grasslands 474 10%
Salt and brackish marshes 368 8%
Freshwater marshes, swamps, and bogs 102 2%
Beach and mudfl at 65 1%
Old fi elds and successional shrub 40 1%
Freshwater riparian zones 27 1%
Ponds 7 less than 1%
Tidal creeks 2 less than1%
Natural areas subtotal 4777 99.9%
Island-wide total 4782 100%
B. 1782
Human-dedicated areas
Agricultural fi elds 268 5%
Orchards 210 4%
Roads 194 4%
Built-up area, buildings, and fortifi cations 124 3%
Gardens 10 less than 1%
Human-dedicated areas subtotal 806 16%
Natural Areas
Degraded forest and shrub 3607 73%
Salt and brackish marshes 345 7%
Freshwater marshes, swamps, and bogs 102 2%
Beach and mudfl at 52 1%
Ponds and Reservoirs 13 less than 1%
Freshwater riparian zones 13 less than 1%
Tidal creeks and ditches 5 less than 1%
Natural areas subtotal 4138 84%
Island-wide total 4944 100%
2007 E.W. Sanderson and M. Brown 553
We drew on additional information to inform the potential types of
ecological communities that might have been found on Mannahatta,
including other historical accounts and maps, archaeological evidence,
palynological evidence, and modern ecological studies in the Northeast
relevant to New York City, as referenced in the text. We followed Reschke’s
(1990) system of New York State ecological community types,
divided into marine, estuarine (salt water wetlands), riverine (streams),
lacustrine (lakes), palustrine (freshwater wetlands), and terrestrial (upland)
communities or systems, in the discussion below; Edinger et al.
(2002) provide a revised version of these communities, which was also
consulted. These assignments are all hypothetical, based on the information
provided, and should be considered first guesses to be verified
through additional investigation. We summarize the environmental factors
that would predict where a particular ecosystem would have occurred
based on Reschke (1990), Edinger et al. (2002), and Jorgensen (1977)
(Table 2). This information will be used in subsequent studies to predict
the distribution of ecosystems. For clarity, Reschke’s (1990) community
type names are shown in quotes in the forthcoming discussion.
We estimated the areas of ecosystem types in 1609 and 1782 based on
interpretation of the British Headquarters Map, supplemented by other
information. To estimate 1609 features, we needed to remove the effect of
development between 1609 and 1782. Pre-1782 features in lower Manhattan
were based on interpretation of the Castello Plan (Cortelyou c. 1665), the
Table 2, continued.
Land-cover type Area (ha) % total
C. 2004
Human-dedicated areas
Buildings 1843 34%
Sidewalks, courtyards, parking lots, gardens, 1474 27%
and other open areas
Roads 1303 24%
Recreational open space (over 2 acres) 569 10%
Ball fi elds, hard courts, skating rinks, swimming 86 2%
pools, and playgrounds
Cemeteries 9 <1%
Human-dedicated areas subtotal 5289 97%
Natural areas
Forests* 111 2%
Reservoirs and lakes 54 1%
Salt marshes* 7 <1%
Freshwater riparian zones 4 <1%
Natural areas subtotal 172 3%
Island-wide total 5460 100%
*Areas designated as “forever wild” by the City of New York Department of Parks and
Recreation in Central Park (The Ramble and Hallett Nature Sanctuary) and Inwood Park
(Shorakapok Preserve).
†Includes Swindler Cove Restoration Project salt marsh.
554 Northeastern Naturalist Vol. 14, No. 4
Grim Plan c. 1742–1743 (Grim 1813), and the Maerschalck Plan (Maerschalck
1755), as reproduced in Cohen and Augustyn (1997). Other features
that were the result of colonial development and land use were also removed
from the 1609 calculations. For example, construction roads blocked some
streams and created wetlands; in other cases, marshes were ditched to increase
drainage. In at least one case, a dam backed up a stream to create a
small lake. Riparian areas along streams and tidal creeks were estimated by
buffering streams and creeks with a 2-m buffer. We estimated the area of
Native American habitation sites by placing a 50-m buffer around six known
locations where archaeological evidence indicates prior habitation (Bolton
1934). Active Native American agricultural fi elds were assumed to cover another
50-m buffer around habitation sites. Old fi elds and successional shrubs
following abandonment of agriculture were assumed to be ten times larger
than active fi elds based on preliminary results from Sarna-Wojcicki (2005).
All the fi gures related to Native American use areas should be considered
preliminary. Features from 1782 were interpreted directly from the map in
the context of historical descriptions from the late 18th century.
Scientifi c names and authorities of plants and animals are based on listings
in the Integrated Taxonomic Information System (www.itis.usda.gov)
(US Department of Agriculture 2006).
Historical features
Where possible, we assigned names to historical features shown on the
British Headquarters Map based on an extensive review of the historical literature
(Fig. 2). The history of naming on the island is a complicated subject
derived from at least three different languages: Munsee, the language of the
original inhabitants; Dutch, of the New Amsterdam colonists; and English,
of the subsequent British and American occupations. For the purposes of
this paper, we provided feature names that appear to have been in use during
the American Revolution, though occasionally refer to earlier names where
appropriate. Major sources for historical names and the approximate street
locations of historical features are Hill and Waring (1897), Riker (1904),
Stokes (1915–1928), Grumet (1981), Jackson (1995), and Koeppel (2000)
and the maps of Viele (1865), and MacCoun (1909), as well as the British
Headquarters Map itself.
Modern datasets
We compared the historical features to modern geographic datasets for
Manhattan roads from the New York City “PCPLION” roads dataset (City
of New York - Department of City Planning 2005). The positional accuracy
of the PCLION dataset is reported as 0.65 mm. Modern land use, including
buildings, open space and roads, and shoreline data was derived from the
New York City Base Map (Richter and Ostroff 2001). Modern riparian zones
were estimated from a map of Central Park and unpublished surveys by E.W.
Sanderson on Harlem Heights.
2007 E.W. Sanderson and M. Brown 555
Results and Discussion
The British Headquarters Map provides a remarkable view of the landscape
of Manhattan in 1782 and allows us to make inferences about the
ecological landscape then, and in earlier times. We review the geometrical
accuracy of the map and then summarize the presumed main land-cover
types on the island in 1609 in contrast to the island in 2004, before turning
to a more speculative discussion about the nature of the ecological communities
within each of the major land-cover types. We also identify the
geographical highlights (e.g., the longest stream, the largest wetland) and
where possible, indicate some of the species that might have been found on
Mannahatta. Although the British Headquarters Map is the primary resource,
we draw on other historical, archaeological, and ecological lines of evidence
as well.
Geometrical accuracy
Using a fi rst-order rectifi cation process, we were able to obtain a root mean
square error of approximately 40 m for the British Headquarters Map; in
city terms, approximately half an uptown block in midtown Manhattan. The
actual geometric accuracy based on comparisons of historical sites to known
contemporary locations varied from less than 5 m to more than 150 m, with
more variation toward the northern tip of the island. These errors may be due
to problems with the map assembly, reproduction of the map, our selection of
positions used in the georeferencing, and/or miscalculations in the original
surveys. However, these problems should not greatly impact the fi nal results
as they extend over only a limited area and we report only summary statistics
for the whole island here. Moreover, this geometric accuracy is quite remarkable
for a map of this era, comparing favorably with the best county survey
maps made in peacetime England in the 18th century (Laxton 1976).
Manhattan and adjacent islands
The shoreline of Manhattan shown on the British Headquarters map
was 81.5 km long and varied between 0.5–3.4 km wide, enclosing an area
of approximately 4944 ha. This area is approximately 3.3% larger than the
area of the island in 1609, but 9.4% smaller than the island in 2004 (Tables
2a–c). These calculations include the numerous marshy islands immediately
adjacent to Manhattan uplands (mainly along East and Harlem Rivers), but
excludes major East River and Upper Bay islands: Governor’s Island and
Blackwell’s Island (now Roosevelt Island) (Seity and Miller, 1996). Expanding
Manhattan by using the near-shore waters as a dump began in Dutch
times and continued well into the 20th century (Buttenweiser 1999). At the
time of the British Headquarters Map in 1782, two blocks (Pearl to Water
Street, and Water to Front Streets) had already been created, with docks and
slips extending farther into the East River. The “fi ll” came from garbage,
including sewage, and hills removed in lower Manhattan. (Koeppel 2000).
Development of industrial sites, road construction, and promenades enlarged
the island to its modern size (Buttenweiser 1999).
556 Northeastern Naturalist Vol. 14, No. 4
The shores of Manhattan used to have numerous sandy beaches, especially
along the Hudson shore, covering a total area of 52 ha on the British
Headquarters Map. A nearly continuous line of beaches extended from
modern day Vesey Street to 33rd Street (4.6 km long), then again from 43rd to
57th Street (1.2 km). Formerly, some of these beaches wrapped around lower
Manhattan and up the East River shore. Other beaches fi lled pocket coves
along the Hudson and were found north of Corlear’s Hook, in Turtle Bay,
and along the Harlem shore on the east side of the island. Gifford Audubon,
John James Audubon’s son, painted his father sitting on one of the Hudson
River beaches near 155th Street in 1845 (Museum of the City of New York
1997), and the Ratzer Map (1767) has an inset image which shows the beach
on Governor’s Island, facing Manhattan (Cohen and Augustyn 1997).
Watercourses and water bodies
We identifi ed sixty-six separate hydrological networks on the British
Headquarters Map, varying in network length and number of channel segments.
The total length of all of the watercourses on the island circa 1782
was 108 km (≈67 miles). The largest hydrological network (by length) was
Old Arch Brook, or Saw Kill to the Dutch, a 13,710-m long fourth-order
stream, which drained the central part of the island in what later became
Central Park. Other noteworthy stream courses were: Minetta Water
(4370 m), which drained through what has since become Washington Square
Park and Greenwich Village; the Great Kill (4640 m), which drained the area
from around Times Square to the Hudson River and which was known for
its hunting and fi shing (Stokes 1915–1927); and Pension’s Creek (6750 m),
probably the largest stream course by volume, which drained Morningside
Heights down through the Harlem Plains.
The majority of the watercourses (60% on an areal basis) flowed
through upland areas, forming various riverine and associated palustrine
ecosystem types (see below). Twenty-five percent of watercourses flowed
through saltwater (estuarine) wetlands and 12% through freshwater
(palustrine) wetlands.
Twenty-one ponds or other wide watercourses are shown on the British
Headquarters Map. The most important pond was the Collect Pond or Fresh
Water (2.2 ha), an important freshwater source for New York City for its
fi rst 200 years, but which was later fouled with pollution from a tannery and
fi lled; later this neighborhood became infamous as the Five Points area (see
Koeppel 2000 for a detailed history). Richmond Hill Pond, which collected
the Minetta Water, was larger in area (3.2 ha) though probably shallower
and may have been brackish. This pond was probably created as a defensive
measure during the Revolutionary War, as it does not appear on maps from
before the war (e.g., Ratzer Map). Other ponds varied in size from 0.01 ha
to 1.3 ha. Nine salt ponds are shown within saltwater wetlands, varying in
size from 0.03 to 0.5 ha.
2007 E.W. Sanderson and M. Brown 557
Many of the watercourses and wetlands show modification by human
beings. Channels in both the Lispernard Meadows and Stuyvesant’s
Meadows near New York City show signs of channel straightening and
ditching. Salt marshes were ditched then, as they still are now, to improve
drainage and lower the water table; during the Revolutionary period,
such management was an attempt to increase production of salt hay for
domestic livestock (Stilgoe 1994). The main stream through Lispernard
Meadows, for example, was deepened and straightened into a canal that
eventually lent its name to modern day Canal Street. Other watercourses
were impacted by roads, which either foreshortened them or caused alterations
in their course (e.g., the stream flowing into Sun-fish Pond);
however, most of these modifications were limited to the southern half of
the island, nearest the city.
The most dramatically modifi ed watercourses are those that cannot be
seen on the British Headquarters Map because they had already been lost
beneath the 18th century city. These include the small stream the Dutch colonists
enlarged to form the “Heere Gracht” along modern Broad Street, and its
smaller auxiliary, whose former inhabitants gave their name to Beaver Street
(Stokes 1915–1928). Hill and Waring (1897) write of a lovely, pebble-lined
brook called the Maagde Paetje (or Virgin’s Path) along the line of Maiden
Lane, which by 1782 had been buried. Other streams were modifi ed by roads
and agricultural areas in the 18th century. In total, there was nearly twice as
much area classifi ed as “riparian” in 1609 as in 1782. Nearly all of these
streams have been lost from the 21st-century city.
Wetlands
Wetlands of various types covered nearly 10% of Manhattan Island, circa
1782. We identifi ed 25 saltwater wetlands or wetland complexes (totaling
345 ha, inclusive of associated watercourses) and 9 freshwater wetlands on
Manhattan Island (totaling 102 ha). Upland riparian areas associated with
streams covered another 13 ha.
The largest single wetland on the island was the salty Stuyvesant’s
Meadows, just north of Corlear’s Hook on the East River shore. The largest
wetland complex was associated with Pension’s Creek in Harlem, also
a large salt marsh. Together the wetlands along the East River near Harlem
amounted to about 40% of Manhattan’s total, nearly 151 ha. Other signifi
cant salt marshes were Lispernard Meadows (31 ha), which probably
enclosed a gradient from salt water to brackish to fresh water where they
drained the Collect Pond; the wetlands around Sherman Creek (33 ha), also
probably partially brackish; and the wetlands surrounding Marble Hill at
Spuyten Duyvil (21 ha). In general, the topography of the island along the
East and Harlem Rivers favored salt marshes more than the Hudson River
side because it was more protected from wave action.
A series of freshwater wetlands are shown fi lling valley depressions in
the center part of the island, contributing to streams that drained both east
and west. Several were found in the grounds of today’s Central Park; one
558 Northeastern Naturalist Vol. 14, No. 4
of these (38 ha) nearly surrounded a large hill that provided the headwaters
to Old Arch Brook. During the construction of Central Park, large drainage
structures and tile fi elds were installed to remove these waters, and workmen
complained of the boggy lands they were converting to a park (Rosenzweig
and Blackmar 1992). Other freshwater wetlands were associated with Montayne’s
Rivulet (12 ha), Minetta Water (5 ha) near Washington Square Park,
and many of the unnamed smaller waterways coursing across the island.
Uplands
The remaining 90% of the island was composed of upland ecosystems,
largely forests, except on the Harlem Plains, which may have been
a grassland, and along the shores, where there were often beaches. Early
commentators lavished praise on the forests that once clothed the island
(Table 1). Unfortunately, by 1782 these fine woods had experienced extensive
deforestation, accelerated by the harsh winters of 1779–1780 and
1780–1781. The large occupying forces, intermittently cut off from access
to the surrounding hinterland, were forced to turn on the local resources
of Manhattan with dire effect. Burrows and Wallace (1999) quote George
Washington’s comments a year later, observing the successional shrubland
where once trees had stood: “the island is totally stripped of trees; low
bushes … appear in places which were covered with wood in the year
1776.” These areas of degraded forest and shrub covered 3607 ha (73%)
of the island in 1782. In contrast, there would have been approximately
3692 ha of old-growth primary forest, in several different forest types (see
below), in 1609.
The main exception to the dominant forest cover of the island may have
been the Harlem Plains. In a letter, an early Dutch settler, De Rasieres
(1628?), wrote “On the east side (of Manhattan Island) there rises a large
level fi eld, of from 70 to 80 morgens of land (140–160 acres), through which
runs a very fi ne fresh stream; so that land can be ploughed without much
clearing,” (parenthetical comments added by the editor, Jameson). Similarly,
Riker (1904), in his History of Harlem, imagines standing at McGown’s
Pass and seeing “a fi ne level plain” where a Dutchman could fi nd a “future
home [on] the rich fl ats of Muscoota, promising to rival in productiveness
the fertile meadows around his native Leyden.” Torrey et al. (1817) reports
a large number of species from “meadows” on the island, though many of
these 19th-century meadows were likely the result of local clear cutting.
De Rasieres (1628?) identifi ed another patch of land where two farmers
“would have enough to do without much clearing at fi rst” that may have occurred
north of Sherman Creek and south of Marble Hill in an area known
as Round Meadow. If both these areas were grasslands, they would have
amounted to a signifi cant area, over 450 ha or nearly 10% of the island.
If the Harlem Plains and Round Meadow were grasslands of some sort,
they were likely maintained by Native American burning. Bean (2004)
showed that a fi re frequency of 10 years or less would be suffi cient to keep
this area open. These factors are discussed further below.
2007 E.W. Sanderson and M. Brown 559
A much smaller area in what is now Tribeca was dominated by sandy
soils, extending in some places 110 m from the shore and enclosing two
ponds, a total area of 0.6 ha. This area may have contained dunes and may
have been part of the same geological formation as the Sand Hills, or Zandtberg
in Dutch, that extended to Richmond Hill overlooking Minetta Water,
and north into Greenwich Village. These areas, plus the sandy beaches described
previously, covered nearly 52 ha in 1782 and 65 ha in 1609 (Table 2).
Today these features do not exist.
Human-dedicated areas
The most dramatic change on Manhattan Island over the last 400 years
has been the amount of land dedicated to exclusively human uses. In 1609,
such areas probably covered less than 1% of the island, in terms of area occupied
by habitations and used for active agriculture (Table 2a). Of course,
more extensive areas were hunted, fi shed, and likely infl uenced by Native
American burning. By 1782, the diversity of human uses and the area occupied
had increased dramatically, from approximately 5 ha in 1609 to 806 ha
by 1782 (Table 2b). Human uses in 1782, apparent on the British Headquarters
Map, include urban areas and buildings, agricultural fi elds and orchards,
and gardens. Other natural areas, however, would have been used for hunting
and fi shing and cutting of fi rewood. By 2004, the island had again changed
dramatically, with approximately 97% of the land area dedicated to human
use, including buildings, roads, recreational open spaces, and a complicated
intermixture of sidewalks, plazas, gardens, and parking lots (Table 2c). The
forest areas managed for ecological value cover only 111 ha (about 2% of the
2004 island). Open-water lakes and reservoirs provide some aquatic habitat
(54 ha), and there are a few salt marshes remaining in northern Manhattan as
the result of restoration efforts (7 ha).
Marine and estuarine ecosystems
The near-shore waters of Manhattan are reported to have once teemed
with marine life, including organisms usually associated with “marine deepwater”
communities. In a letter, De Vries (1655) wrote of the many marine
fi sh accessible from New Amsterdam including Morone saxatilis Walbaum
(Striped Bass), Pseudopleuronectes americanus Walbaum (fl ounder, e.g.,
Winter Flounder), Alosa sapidissima Wilson (herring, e.g., American Shad),
Morone americana Gmelin (White Perch), and Anguilla rostrata Lesueur
(American Eel), many of which still frequent the New York Bight (Steinberg
et al. 2004, Waldman 1999). Briggs and Waldman (2002) summarize the historical
marine fauna in detail, including fi sh of the New York harbor to the tip
of the Battery. One of the reasons Manhattan was selected for the site of New
Amsterdam was the deep water just off the tip of the island. Measurements
reported on the Debarres Chart, circa 1776 (also reproduced in Cohen and
Augustyn [1997]), indicate 5–10 fathom (10–20 m) depths between Manhattan
and Governor’s islands. The original charter for Trinity Church in lower
560 Northeastern Naturalist Vol. 14, No. 4
Manhattan included rights to whales that stranded themselves on the nearby
beach (Stokes 1915–1928).
In shallower water, “marine eelgrass meadows” likely fl ourished with their
distinctive fauna, although no indication is given on the British Headquarters
Map. Kieran (1959) noted that Zosteva L. (eelgrass) once occurred near the
city and may have been returning in the 1950s; Torrey et al. (1817) documented
Zostera marina L. (seawrack) in their botanical surveys of the vicinity of
New York. We speculate that eelgrass meadows may have occurred in shallow
protected coves in the lower part of the East River, particularly in Kip’s and
Turtle bays. Sea turtles as well as freshwater turtles may have frequented these
areas, although the name for Turtle Bay may also come from the shape of the
bay, like a turtle’s curved back (Moscow 1990). Extensive eelgrass beds were
known from comparable areas along the Long Island shore (Conrad 1935);
however, a wasting disease in the 1930s suddenly decimated the beds (McRoy
and Helfferich 1977).
The salt marsh ecosystems that can be seen on the British Headquarters
Map were variations of tidal salt marsh, stratifi ed into different communities
by small changes in elevation relative to mean sea level (Bertness 1999). At
the lowest end, below mean sea level, tidal creeks drained the salt-marsh ecosystems
along the shores of the island. Along the margins of the tidal creeks
and extending into the marsh at elevations from mean sea level to mean high
tide may have been low salt marsh, replaced by high salt marsh from mean
high tide up to the highest limit of the spring tidal infl uence. Salt pannes would
form where there was poor drainage from the salt marsh, creating shallow
depressions. It is not clear whether the small oblongs in Stuyvesant’s Meadows
on the British Headquarters Map are salt pannes covered by water or salt
pond ecosystems (they are counted in the numbers above as ponds). Along the
upland edge of the salt marshes, there would have been borders of “salt scrub”
that may have extended some distance inland along the swampy watercourses
of lower Manhattan.
Upstream in the many watercourses that drained into salt marshes, there
would be a transition from fully salt to brackish communities. The width of
this transition would depend on the slope of the channel above mean high tide;
in areas of gentle slope, for example, around Sherman Creek, there probably
were extensive brackish marshes and the possibility for brackish mudfl ats
or rocky shores. The marshes that were rapidly drained and buried in lower
Manhattan (e.g., Beekman’s Swamp, near Kip’s Bay) may have been brackish
marshes, or combinations of brackish marsh and salt scrub. In the watercourse
channels, brackish subtidal aquatic beds would have replaced tidal creeks upstream
where freshwater fl ow began to dominate the stream.
Palustrine, riverine, and lacustrine ecosystems
Palustrine ecosystems stretched across a continuum from brackish
marshes to fully freshwater ecosystems upstream. In palustrine ecosystems,
the depth and frequency of flooding are main drivers of ecosytem type,
creating wetlands that varied from herbaceous marshes to wooded swamps.
2007 E.W. Sanderson and M. Brown 561
Deep and shallow emergent marshes probably occurred along watercourses
and near the margins of many of the eutrophic ponds where there were
permanently flooded conditions, with the difference between “deep” and
“shallow” water being approximately 15 cm (6 inches). If the Collect Pond
had the tidally or seasonally variable water levels of a coastal plain pond
(see below), then the surrounding marsh vegetation may have had characteristics
more like the coastal-plain pond-shore ecosystem type. Shrub
swamps (e.g., shrub carr, alder thickets) would have occurred where slightly
drier conditions allowed shrubs to establish, and may have been replaced
successionally by red maple hardwood swamps and perhaps floodplain
forest (Luttenberg et al. 1993), particularly in the wetlands in the center of
the island. Engineers and construction crews complained of the extensive
wooded swamps that had to be cleared during the construction of Central
Park in the 1850s (Rosenzweig and Blackmar 1992).
Manhattan is near the southern limit of sphagnous peatlands (Johnson
1985), however there are a number of indications that these ecosystems were
interlaced among other fresh-water wetlands types. Torrey et al. (1817) reported
bog meadows and sphagnous swamps on Manhattan Island in his day,
including “wooded, boggy” places in Bloomingdale (now the Upper West
Side) and Central Park construction crews found bogs as well as swamps
(Rosenzweig and Blackmar 1992). Peatlands typically form in permanently
fl ooded areas where anoxic conditions develop. The open, bog meadows of
early Manhattan were probably related to the “coastal plain poor fens” of Long
Island and peatlands partially covered by shrub cover were likely “highbush
blueberry bog thickets,” co-dominated by Rhododendron viscosum (L.) Torr.
(swamp azealea)—these ecosystems probably existed in the coolest, wettest
parts of shallow emergent marshes and shrub/red maple hardwood swamps,
respectively. The nutrient character of these bogs may have varied from place
to place, depending on the extent to which the local groundwater was enriched
by underlying bedrock (e.g., calcareous Inwood marble type). Cedar swamps
were known to occur near Manhattan Island in New Jersey and Long Island
(Torrey et al. 1817), and a wetland with conifer-type trees is shown on the British
Headquarters Map in the vicinity of modern Central Park. Kieran (1959)
indicated that Chamaecyparis thyoides (L.) B.S.P. (Atlantic white cedar) was
once common in swamps and bogs around the city. Thus, if forested peatland
was once found on Manhattan, it would have likely been of the “coastal plain
Atlantic white cedar swamp” type.
“Rocky headwater stream” probably described most of small streams visible
in the uplands on the British Headquarters Map, particularly where there
was signifi cant slope. However, there were also other streams, including
some of the largest, that arose from springs or groundwater sources associated
with freshwater wetlands in the center of the island and were probably of
the marsh headwater stream type. These streams are generally shown with
the associated wetlands on the British Headquarters Map. Regardless of
source, some of the larger streams may have conformed to the more regular
562 Northeastern Naturalist Vol. 14, No. 4
“midreach stream” type before reaching salt water, where they would have
become increasingly brackish and then saline. Many of these streams may
not have fl owed year-round, particularly in drought years. Hill and Waring
(1897) note that Sun-fi sh Pond nearly disappeared during times of protracted
drought, suggesting that many of the freshwater streams may have been
seriously affected by times of low water. These stream courses would have
been punctuated by shoreline rocks and outcrops, remnants of the former
glaciation of the island; these outcrops supported separate terrestrial communities
of plants, mosses, and lichens. The community structure of these
outcrops depended on whether the substrate was calcareous in origin or not
(“shoreline outcrop” and “calcareous shoreline outcrop”). Calcareous rocks
underlay Manhattan in some places (e.g., Inwood marble), although outcrops
of calcareous type were probably rare.
Most of the small freshwater ponds on the island were probably
“eutrophic ponds,” not deep enough to stratify during the summer. These
ponds might have supported a characteristic warm-fi sh biota, although its
composition is uncertain since it would have depended on the connectivity
of freshwater networks during the post-glacial phase before sea-level rise
created Manhattan Island (see discussion in Schmidt 1986). Possibilities
include such Northeast regulars as Lepomis gibbosus L. (pumpkinseed),
Pomoxis nigromaculatus Lesueur in Cuvier and Valenciennes (Black Crappie),
and Lepomis auritus L. (Redbreast Sunfi sh; there was a Sun-fi sh Pond
on Manhattan). Ponds connected to the marine waters likely were visited
by Alosa pseudoharengus Wilson (Alewife) and Anguilla rostrata Lesueur
(American Eel) (Halliwell et al. 2001; Whittier et al. 1999, 2000, 2001).
The one pond that may have been suffi ciently deep to stratify twice per
year was Collect Pond, which, following Reschke (1990), may have been a
“coastal plain pond,” formed in a kettle-hole left after the retreating glaciers.
Nineteenth-century accounts remark on the depth of this pond, anywhere
from 40–70 feet deep (e.g., Hill and Waring 1897, Stokes 1915–1928). We
know that Collect Pond received groundwater feeders (Koeppel 2000), but
it’s less clear whether the water level may have risen tidally; some authors
(e.g., Barlow 1969) indicate that it may have once been possible to paddle
through the marshes and across Collect Pond, from the Hudson River to the
East River, at high tide.
Finally, “vernal pools” most likely fi lled small, localized depressions in
the upland woodlands after signifi cant rains and snowmelt, drying over the
course of the summer, but were too small and/or of too little signifi cance
to be recorded by military surveyors. These areas did provide an important
ephemeral habitat for many woodland-dwelling amphibians, so much so that
Peter Kalm, during his 1744 visit to New York City, complained of all the
noise. He wrote: “Tree frogs, Dr. Linnaeus’s Rana arborea (Kalm) [probably
means Hyla cinerea Schneider, the Green Tree Frog] are so loud it is diffi cult
for a man to make himself heard” (cited in Kieran [1959]).
2007 E.W. Sanderson and M. Brown 563
Terrestrial ecosystems
The British Headquarters Map provides only scattered information about
the natural forest cover of Manhattan, largely because it was nearly gone by
the time the map was created, but all the evidence points to the island being
extensively forested in pre-contact times. Burrows and Wallace (1999) quote
anonymous travelers describing forests with towering stands of walnut, cedar,
chestnut, maple, and oak. Other early chroniclers, eager to fi nd resources
suitable for merchandise focus on the “abundance of blue plums and the
fi nest oaks for height and thickness that one could ever see; together with
poplars, Lonen, and various other woods useful in ship-building” (De Laet
1625; also see Table 1). The palynological evidence from Staten Island and
Queens also supports a diverse forest including Quercus, Pinus, Carya,
Betula, and Tsuga species (Kleinstein 2003, Sirkin 1967). Data from witness
trees and other colonial records confi rms these same major tree species
in 18th century Queens (Greller 1972, 1975). Nicholls’ Map of 1664, drawn
shortly after the British captured Manhattan from the Dutch, shows the
island extensively forested, especially from Murray Hill north (Cohen and
Augustyn 1997), part of the vast mixed deciduous forests that once cloaked
the eastern third of North America (Whitney 1994).
The forests of Mannahatta were likely mainly of the “chestnut-oak forest”
and “oak-tulip tree forest” types, mixed with occasional patches of
“hemlock–northern hardwood forest” in cooler, wetter ravines, an extension
of the vast broadleaf deciduous forests that cloaked the Northeast (Kershner
1998, Luttenberg et al. 1993). Castanea dentata (Marsh.) Borkh. (American
chestnut) was most likely the dominant species of these forests (Paillet
2002), though other hardwoods (e.g., Quercus rubra L. [northern red oak],
Quercus alba L. [white oak], Liriodendron tulipifera L. [tulip tree], Acer
rubrum L. [red maple], and Fagus grandifolia Ehrh. [American beech]) were
also likely to be important.
There are also records of some softwoods from the island, including Pinus
strobus L. (white pine) and Pinus rigida P. Mill. (pitch pine) (Torrey et
al. 1817), which may indicate a community like the “Appalachian oak-pine
forest type” as well as “pitch pine-scrub oak barrens,” depending on fi re
frequency and substrate.
The subtle differences in these mixed deciduous forest types would have
been due to gradients in edaphic factors such as soil depth and moisture, so
that hilltops and areas with sandy soils would have been drier, possibly supporting
the more xeric chestnut-oak forest type; hillside slopes and deeper
soils may have supported the more mesic oak-tulip forest. Luttenberg et
al. (1993), in suggesting native plants for New York City, expanded this
description to include “rich mesophytic forests” (on the mesic end) and
“oak openings” (on the xeric end), though Reschke (1990) does not describe
either of these forest types from the New York City region. These forests
types grade into each other so continuously that a classifi cation system like
Jorgensen’s (1977) description of hilltop, mid-slope, and low-slope oak
564 Northeastern Naturalist Vol. 14, No. 4
forest communities may be as useful for describing their inter-relationships
as the Reschke (1990) community types. At the wettest end, “red maple hardwood
swamps” or “shrub swamps,” already discussed, fi lled the lower-lying
depressions. Along the steepest slopes (e.g., along Morningside Heights
overlooking Harlem), all of these communities would have been replaced
with open-cliff communities, whose species composition varied with substrate
(“cliff community” and “calcareous cliff community”), though, as
stated earlier, calcareous substrates may have been rare.
Conceptualizing these ancient forests in light of the forests of today
is difficult because of the loss of the major overstory dominant tree
(American chestnut), the dramatic history of deforestation and then reforestation
over most of the Northeast (though not Manhattan), introduction
of new species, and changes in disturbance regime. Dunwiddie et al.
(1996), White and White (1996), and Whitney (1994) provide quantitative
descriptions of representative old-growth stands comparable to Mannahatta’s
former forests; Brash (2004) summarized much of this data to
generate a “type specimen” description that conforms to the ecological
communities described here.
These forests were often impacted by fi res set by Native Americans; Van
der Donck (1650) describes mid-17th-century Native American fi re use on
Manhattan and in nearby areas, and fi re has been documented in southern
New England (Cronon 1983) and with many other Native American groups
in the 17th century (Day 1953). Native Americans lit fi res to clear the underbrush
to ease travel and to increase levels of game—practices which are
still used by rural peoples today (Putz 2003). These fi res likely were a major
infl uence on the terrestrial ecosystems of the island (Foster et al. 2002).
Bean (2004) showed through fi re disturbance and succession modeling,
that fi res occurring more often than once every 10 years would have been
suffi cient to create the large “meadows” that De Raiseres (1628?) described
in his letters. Moreover, it is unlikely that non-anthropogenic ignitions (i.e.,
lightening strikes) occurred frequently enough in such a small area to create
a grassland (e.g., Loope and Anderton 1998). Archaeological evidence,
though fragmentary, confi rms that there was at least one Lenape settlement
in Harlem in early 17th century (Bolton 1934, Grumet 1981). The Nicholls’
Map of 1664, mentioned above in the context of forest cover, shows Harlem
without forest, though by that time, at least some of the area had been converted
for Dutch agriculture (Riker 1904).
There are precedents for grasslands in the New York region. On western
Long Island, there was once an extensive grassland ecosystem, the
Hempstead Plains grassland, which covered over 24,000 ha and extended
into scattered pockets in Brooklyn (Harper 1911). This grassland type was
remarkable for its physiognomic similarities to the tallgrass prairies of the
Midwest, although there were subtle differences in species composition
(Cain et al. 1937, Conrad 1935). The persistence of these grasslands may
have been due in part to periodic fi res set by the native people, as today
2007 E.W. Sanderson and M. Brown 565
national park service personnel seek to restore Brooklyn’s Floyd Bennett
Field’s grasslands using fi re (Mittelbach and Crewdson 1997). So if Harlem
were once a grassland, it is likely to been of the “Hempstead Plain grassland
type”, or at least closely related.
It is possible that the Sand Hills (Zandtberge to the Dutch) of lower
Manhattan that stretched from Tribeca along the southern edge of Greenwich
Village up to Astor Place originally hosted another fi re-dependent ecosystem,
“pitch pine-scrub oak barrens,” akin to the pine barrens of Long Island
and New Jersey. Some of these hills on the British Headquarters Map show
the same markings as the sandy beaches. Torrey et al. (1817) documented
pitch pine in the vicinity of New York, but indicated this species was rare at
the beginning of the 19th century when these hills would have already been
largely cleared. These forest barren community types depend on a frequentfi
re regime (6–15 year repeat cycle) that may have been supplemented by
fi res set by the nearby Lenape communities near Collect Pond, in Sappokinican
(Greenwich Village), and an unnamed habitation site identifi ed in the
East Village (Grumet 1981).
Rounding out the list of terrestrial ecological communities, there would
have been a number of cultural ecological communities associated with the
human inhabitants of Manhattan. Early accounts document that the Lenape
people who lived on Manhattan at the beginning of the 17th century were garden
horticulturalists (though see discussions in Ceci 1979, 1982), so likely
there were actively cultivated fi elds at several locations on the island (“cropland”
types). Grumet (1981) maps several of these, following the suggestions
of Bolton (1934), though all of this should be treated skeptically. As these
fi elds were depleted over the course of several growing seasons, the people
probably moved to clear new fi elds, leaving the old fi elds to become successional
ecosystems—“successional old fi elds,” then “succesional shrublands,”
and eventually forest again, barring further disturbance (Sarna-Wojcicki
2005). These successional communities probably also characterized forest
recovery after windthrows associated with hurricanes and other severe storms.
Native Americans also populated village sites on the island, building wigwam
and longhouse living structures out of natural materials and depositing their
wastes in piles or middens (“landfi lls/dumps”). Apparently, the hill above Collect
Pond was the site of a shell midden; several early authors cite the Dutch
name of Kalck Hoeck as a corruption of “kalch” meaning lime, probably referring
to oyster shells left by Indians (e.g., Hill and Waring 1897, Stokes 1915–
1928). “Unpaved paths” connected these community and fi elds, creating small
disturbances in the understory of forests and grasslands. All of the culturally
derived ecological communities types need redefi nition from the cultural communities
offered by Reschke (1990), whose defi nitions focus on contemporary
communities much different from those that once occupied Manhattan Island.
Summary of predictors of ecosystem distribution
Finally, we summarized in the on-line supplemental materials the
factors that would have predicted the spatial distribution of ecosystems
566 Northeastern Naturalist Vol. 14, No. 4
(Table S1). The factors across the top of the table can be thought of as
the GIS layers necessary to predict the communities listed along the side
of the table. We found that 27 factors are necessary to map the potential
distribution of ecological communities on Mannahatta; ten of these can
be derived directly from the British Headquarters Map, the remainder
will require additional information (e.g., derivate soil characteristics)
and ecological modeling (e.g., disturbance processes). We also found that
these factors fit into five super-categories of predictors: topography, geomorphology,
soil, water, and disturbance. Combinations of these five core
elements are sufficient to predict the distributions of the 54 communities
that once occurred on Manhattan Island.
Conclusions
The British Headquarters Map provides an important, geometrically
accurate and extraordinarily detailed window on the past environment of
Manhattan. Although all historical sources need to be used with care, this
map provides a starting point for understanding the natural landscape of
Manhattan, not only in 1782, when the map was created, but farther into the
past, including the pre-contact landscape of 1609. We also take advantage
of historical accounts, ecological evidence, and archaeological information
to supplement information derived directly from the British Headquarters
Map and support hypotheses about the ecological community composition
of the island. In turn, these comparisons will eventually allow us to create
geographically precise descriptions of the natural features extant circa 1609,
not only speculating about these communities, but putting them on the map
in such a way that they can be compared directly to the block-by-block geography
that is home to over 1.5 million people and workplace for another
2.6 million people (US Census Bureau 2006).
Acknowledgments
The authors would like to gratefully acknowledge Han-Yu Hung and Everett W.
Sanderson for their assistance in the fi eld, and Jerry Jenkins, Dorothy Peteet, Kent
Redford, John Robinson, Amy Vedder, and John Waldman for their advice and support.
Robert DeCandido, Sidney Horenstein, and Andrew Greller provided helpful
comments on an earlier draft of this manuscript. The guest editor and two anonymous
reviewers made additional helpful comments. Gillian Woolmer provided GIS
advice and Christina Baranetsky, Timothy Bean, and Daniel Sarna-Wojcicki assisted
with the GIS analysis during internships supported by the Center for Environmental
Research and Conservation at Columbia University. Markley Boyer made suggestions
on the illustrations. Environmental Systems Research Institute’s Conservation
Program provided GIS software. The Wildlife Conservation Society, the Prospect
Hill Foundation and the Sanderson-Hung Family Foundation supported this work
fi nancially. The contributions of all are greatly appreciated.
Literature Cited
Barlow, E. 1969. The Forests and Wetlands of New York City. Boston, Little, Brown,
New York, NY. 160 pp.
2007 E.W. Sanderson and M. Brown 567
Bean, T. 2004. What made the harlem plains a grassland? Computer modeling for historical
ecology of an urban environment. Senior Honors Thesis. Columbia University,
New York, NY.
Bertness, M.D. 1999. The Ecology of Atlantic Shorelines. Sinauer Associates, Inc.
Sunderland, MA.
Brash, A. 2004. New York City’s primeval forest: Depicting the “type specimen.”
Transactions of the Linnaean Society of New York. Spring 2004.
Briggs, P.T., and J.R. Waldman. 2002. Annotated list of fi shes reported from the marine
waters of New York. Northeastern Naturalist 9:47–80.
Bolton, R.P. 1934. Indian Life of Long Ago in the City of New York. J. Graham, New
York, NY. 167 pp.
Burrows, E.G., and M. Wallace. 1999. Gotham: A History of New York City to 1898.
Oxford University Press, New York, NY. 1383 pp.
Buttenweiser, A.L. 1999. Manhattan Water-bound: Manhattan’s Waterfront from
the Seventeenth Century to the Present. Syracuse University Press, Syracuse,
NY. 308 pp.
Cain, S.A., M. Nelson, and W. McLean. 1937. Andropogonetum hempsteadi: A Long
Island grassland vegetation type. American Midland Naturalist 18:334–350.
Ceci, L. 1979. Maize cultivation in coastal New York: The archeological, agronomical
and documentary evidence. North American Archaeologist 1:45–74.
Ceci, L. 1982. Method and theory in coastal New York archaeology: Paradigms of
settlement behavior. North American Archaeologist 3:5–36.
City of New York-Department of City Planning. 2005. LION. Vector digital data.
Available online at http://www.nyc.gov/html/dcp/html/bytes/applbyte.shtml#geo.
Accessed 23 September 2002.
Cohen, P.E., and R.T. Augustyn. 1997. Manhattan in Maps 1527–1995. Rizzoli, New
York, NY. 164 pp.
Conrad, H.S. 1935. The plant associations of central Long Island. American Midland
Naturalist 16:433–516.
Cronon, W. 1983. Changes in the Land: Indians, Colonists, and the Ecology of New
England. Hill and Wang, New York, NY. 241 pp.
Day, G.M. 1953. The Indian as an ecological factor in the northeastern forest. Ecology
34:329–346.
De Laet, J. 1625. New world. Pp. 29–58, In J.F. Jameson (Ed.). Narratives of New
Netherland, 1609–1664. Barnes and Noble, Inc., New York, NY.
De Rasieres, I. 1628? Letter to Samuel Blommaert. Pp. 97–113, In J.F. Jameson (Ed.).
Narratives of New Netherland, 1609–1664. Barnes and Noble, Inc., New York, NY.
De Vries, D.P. 1655. Court Historiael Ende Journaels Aenteyckeninge. Pp. 181–234, In
J.F. Jameson (Ed.). Narratives of New Netherland, 1609–1664. Barnes and Noble,
Inc., New York, NY.
Dunwiddie, P., D. Foster, D. Leopold, and R.T. Leverett. 1996. Old-growth forests in
southern New England, New York, and Pennsylvania. Pp. 126–143, In M.B. Davis
(Ed.). Eastern Old-Growth Forests: Prospects for Rediscovery and Recovery. Island
Press, Washington, DC. 383 pp.
Edinger, G.J., D.J. Evans, S. Gebauer, T.G. Howard, D.M. Hunt, and A.M. Olivero
(Eds.). 2002. Ecological Communities of New York State. Second Edition. A revised
and expanded edition of Carol Reschke’s Ecological Communities of New
York State. (Draft for review). New York Natural Heritage Program, New York
State Department of Environmental Conservation, Albany, NY.
568 Northeastern Naturalist Vol. 14, No. 4
Egan, D., and E.A. Howell. 2001. The Historical Ecology Handbook: A Restorationist’s
Guide to Reference Ecosystems. Island Press, Washington, DC.
Forman, R.T.T. 1995. Land Mosaics: The Ecology of Landscapes and Regions. Cambridge
University Press, Cambridge, UK. 632 pp.
Foster, D.R., S. Clayden, D.A. Orwig, B. Hall, and S. Barry. 2002. Oak, chestnut, and
fi re: Climatic and cultural controls of long-term forest dynamics in New England.
Journal of Biogeography 29:1381–1400.
Greller, A.M. 1972. Observations on the forests of northern Queens County, Long
Island, from colonial times to the present. Bulletin of the Torrey Botanical Club
99:202–206.
Greller, A.M. 1975. Persisting natural vegetation in northern Queens County, New York,
with proposals for its conservation. Environmental Conservation 2:61–71.
Grumet, R.S. 1981. Native American Place Names in New York City. Museum of the
City of New York, New York, NY. 79 pp.
Halliwell, D.B., T.R. Whittier, and N.H. Ringler. 2001. Distribution of Lake Fishes in the
Northeast: III Salmonids and associated coldwater species. Northeastern Naturalist
8:189–206.
Harper, R.M. 1911. The Hempstead Plains: A natural prairie on Long Island. Bulletin
American Geographical Society 43:351–360.
Hill, G.E., and G.E. Waring, Jr. 1897. Old wells and water-courses on the Isle of Manhattan.
Parts I and II. Pp. 191–262, In M.W. Goodwin, A.C. Royce, and R. Putnam
(Eds.). Historic New York: Being the First Series of the Half Moon Papers. G.P. Putnam’s
Sons, New York, NY.
Hornaday, W.T. 1909. The Wild Animals of Hudson’s Day and the Zoological Park of
Our Day. Hudson-Fulton Commission in cooperation with the New York Zoological
Society, New York, NY.
Jackson, K.T. 1995. The Encyclopedia of New York City. Yale University Press, New
Haven, CT. 1350 pp.
Johnson, C.W. 1985. Bogs of the Northeast. University Press of New England. Hanover,
NH. 269 pp.
Jogues, I. 1646. Novum Belgium. Pp. 259–263, In J.F. Jameson (Ed.). Narratives of New
Neterland, 1609–1664. Barns and Noble, Inc., New York, NY.
Jorgensen, N. 1977. A Sierra Club Naturalist’s Guide to Southern New England. Sierra
Club Books, San Francisco, CA. 417 pp.
Kantrowitz, N. 1995. Population. Pp. 920–923, In Jackson, K.T. (Ed.). The Encyclopedia
of New York City. Yale University Press, New Haven, CT.
Kershner, B. 1998. Guide to Ancient Forests in Vicinity of New York City. New York Old
Growth Forest Association, Williamsville, NY.
Kieran, J. 1959. A Natural History of New York City. Houghton Miffl in, Boston, MA.
428 pp.
Koeppel, G.T. 2000. Water for Gotham: A History. Princeton University Press, Princeton,
NJ.
Kleinstein, D.S. 2003. Paleoecological change during the past millennium at Saw
Mill Creek Salt Marsh, Staten Island, NY. M.Sc. Thesis. Columbia University,
New York, NY.
Laxton, P. 1976. The geodetic and topographical evaluation of English county maps,
1740–1840. Cartographic Journal 13:37–54.
Loope, W.L., and J.B. Anderton. 1998. Human vs. lightning ignition of presettlement
surface fi res in coastal pine forests of the upper Great Lakes. The American Midland
Naturalist 140:206–218.
2007 E.W. Sanderson and M. Brown 569
Luttenberg, D., D. Lev, and M. Feller. 1993. Native Species Planting Guide for New
York City and Vicinity. Natural Resources Group, City of New York, Department
of Parks and Recreation, New York, NY.
MacCoun, T. 1909. The Island of Manhattan (Mannahtin) at the time of its discovery,
1609. Map in the collection of the New York Historical Society, New York, NY.
McRoy, C.P., and C. Helfferich. 1977. Seagrass Ecosystems: A Scientifi c Perspective.
Marcel Dekker, Inc., New York, NY. 314 pp.
McVay, K.R. 1998. ImageWarp ver. 2.0. Available online at http://www.esri.com/
arcscripts. Accessed 1 March 2001.
Mittelbach, M., and M. Crewdson. 1997. Wild New York: A Guide to the Wildlife,
Wild Places, and Natural Phenomena of New York City. Three Rivers Press, New
York, NY. 196 pp.
Moscow, H. 1990. The Street Book: An Encyclopedia of Fordham University Press,
Bronx, NY.
Museum of the City of New York. 1977. Our Town: Images and Stories from the
Museum of the City of New York. Museum of the City of New York, New York,
NY. 222 pp.
Paillet, F. 2002. Chestnut: The history and ecology of a transformed species. Journal
of Biogeography 29:1517–1530.
Penfold, P.A. 1974. Maps and Plans in the Public Record Offi ce, Vol. 2: American
and West Indies. Public Records Offi ce, London, UK.
Putz, F.E. 2003. Are rednecks the unsung heroes of ecosystem management?
WildEarth 13:10–14.
Reschke, C. 1990. Ecological Communities of New York State. New York Natural
Heritage Program, Latham, NY. 96 pp.
Richter, V., and Ostroff, G. 2001. New York City’s New Base Map: The Holy Grail?
ESRI User Conference Proceedings, July 9–13, 2001, San Diego, CA. Available
online at http://gis.esri.com/library/userconf/proc01/professional/papers/
pap949/p949.htm. See also: http://gis.nyc.gov/doitt/mp/Portal.do. Accessed 26
April 2006.
Riker, J. 1904. Revised History of Harlem (City of New York): Its Origin and Early
Annals. New York, NY. 95 pp.
Rosenzweig, R., and E. Blackmar. 1992. The Park and the People: A History of Central
Park. Cornell University Press, Ithaca, NY. 623 pp.
Sanderson, E.W. In press. A view of Manhattan Island at the end of the American
Revolution: A quantitative analysis of the British Headquarters Map, c. 1782,
including comments on its accuracy. Imago Mundi.
Sarna-Wojcicki, D. 2005. Horticulture in Lenape Native American diet and its impact
on the landscape ecology of “Manahatta.” Senior Honors Thesis. Columbia University,
New York, NY. 66 pp.
Schmidt, R.E. 1986. Zoogeography of the northern Appalachians. Pp. 137–159, In
C.H. Hocutt and E.O. Wiley (Eds.) The Zoogeography of North American Freshwater
Fishes. John Wiley and Sons, New York, NY. 866 pp.
Seitz, S., and S. Miller. 1996. The Other Islands of New York City. Countryman
Press, Woodstock, VT. 288 pp.
Shorto, R. 2004. The Island at the Center of the World: The Epic Story of Dutch
Manhattan and the Forgotten Colony that Shaped America. Doubleday, New
York, NY. 385 pp.
Sirkin, L.A. 1967. Late Pleistocene pollen stratigraphy of western Long Island and
eastern Staten Island, New York. Pp. 249–274, In E.J. Cushing and H.E. Wright,
Jr., (Eds.). Quaternary Paleoecology. Yale University Press, New Haven, CT.
570 Northeastern Naturalist Vol. 14, No. 4
Stevens, B.F. 1900. B.F. Stevens’ facsimile of the unpublished British headquarters
coloured manuscript map of New York and environs, 1782. Reproduced from the
original drawing in the War Offi ce, London. Self-published. New York Public
Library Map Division, New York, NY.
Steinberg, N., D.J. Suszkowski, L. Clark, and J. Way. 2004. Health of the harbor: The
fi rst comprehensive look at the state of the NY/NJ harbor estuary. Hudson River
Foundation, New York, NY. 86 pp.
Stilgoe, J.R. 1994. Alongshore. Yale University Press, New Haven, CT. 443 pp.
Stokes, I.N.P. 1915–1928. The Iconography of Manhattan Island, 1498–1909, 6 volumes.
R.M. Dodd, New York, NY.
Torrey, J., C.W. Eddy, and D.J.V. Knevels. 1817. Catalogue of Plants, Growing
Spontaneously within Thirty Miles of the City of New York. Lyceum of Natural
History of New York, NY. 100 pp.
US Census Bureau. 2006. US Census 2000 Gateway. US Department of Commerce,
US Census Bureau, Geography Division, Washington, DC. Available online at
http://www.census.gov/main/www/cen2000.html. Also see http://www.nyc.gov/
html/dcp/pdf/census/demonyc.pdf. Accessed 14 Mrch 2002.
US Department of Agriculture 2006. Integrated Taxonomic Information System (ITIS).
Available online at http://www.itis.usda.gov. Accessed on April 12, 2006.
Waldman, J. 1999. Heartbeats in the Muck: A Dramatic Look at the History, Sea
Life, and Environment of New York Harbor. The Lyons Press, New York, NY.
178 pp.
White, P.S., and R.D. White. 1996. Old-growth oak and oak-hickory forests. Pp.
178–198, in M.B. Davis (Ed.). Eastern Old-growth Forests: Prospects for Rediscovery
and Recovery. Island Press, Washington, DC. 383 pp.
Whitney, G.G. 1994. From Coastal Wilderness to Fruited Plain. Cambridge University
Press, New York, NY.
Whittier, T.R., D.B. Halliwell, and R.A. Daniels. 1999. Distribution of lake fi shes in
the northeast. I. Centrarchidae, Percidae, Esocidae, and Moronidae. Northeastern
Naturalist 6:283–304.
Whittier, T.R., D.B. Halliwell, and R.A. Daniels. 2000. Distribution of lake fi shes in
the northeast. II. The minnows (Cyprindae). Northeastern Naturalist 7:131–156.
Whittier, T.R., D.B. Halliwell, and R.A. Daniels. 2001. Distribution of lake fi shes in
the northeast. IV. Benthic and small water-column species. Northeastern Naturalist
8:455–482.
Viele, E.L. 1865. Sanitary and topographical map of the city and island of New York.
Library of Congress, Washington, DC.