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2016 SOUTHEASTERN NATURALIST 15(4):586–594
Vertebrate Use of Gopher Tortoise Burrows and Aprons
Michelina C. Dziadzio1,2,* and Lora L. Smith1
Abstract - Gopher Tortoise (Gopherus polyphemus) burrows are used by more than 60
vertebrate species, but the frequency with which species use burrows and the extent to
which other vertebrates use the mound of sand at the burrow entrance, called the burrow
apron, has not been quantitatively assessed. Between 2 June and 9 October 2014,
we monitored active and inactive adult Gopher Tortoise burrows with motion-triggered
trail cameras to identify and enumerate vertebrate burrow visitors. We recorded 12,238
video clips during 2299 trap nights, of which 10,151 (83%) contained a Gopher Tortoise
and 1732 (14%) contained other vertebrate species. We reduced multiple videos of a
single burrow visitation to 1 observation, resulting in 929 observations of 14 vertebrate
species (not including the Gopher Tortoise) using tortoise burrows and 34 species on burrow
aprons. Mammals were the most commonly recorded taxa (54%), followed by birds
(32%), amphibians (9%), and reptiles (5%). Active burrows were visited more frequently
than inactive burrows across all taxa, and burrow aprons were used more frequently than
the burrow tunnel. Although active and inactive Gopher Tortoise burrows provide refuge
for some vertebrate species, active burrows may provide additional resources, such as increased
prey for insectivorous species. More species were found to be present on burrow
aprons than within burrows, indicating the apron may be an important microhabitat for
species, including those not known to use burrows.
Introduction
Gopherus polyphemus (Daudin) (Gopher Tortoise) are found throughout the
Coastal Plain of the southeastern United States, but habitat loss and degradation
have resulted in population declines of up to 80% in the last century (Auffenberg
and Franz 1982). Gopher Tortoises occurring west of the Mobile and Tombigbee
Rivers are federally protected under the Endangered Species Act (USFWS 1987),
and the eastern population is currently listed as a candidate species for federal
protection (USFWS 2011). Gopher Tortoise population declines may impact a multitude
of species because their burrows are used by more than 300 invertebrate and
60 vertebrate species as refuge from extreme weather conditions, fire, desiccation,
and predators (Jackson and Milstrey 1989, Kent and Snell 1994). Consequently,
the Gopher Tortoise is considered a keystone species of the Pinus palustris Mill
(Longleaf Pine)–Aristida stricta Michx. (Wiregrass) ecosystem (Eisenberg 1983).
In addition, the mound of sand at the burrow entrance may be used for foraging and
nesting habitat by other vertebrates (DeGregorio et al. 2011, Heinrich and Richardson
1993, Kent and Snell 1994).
1Joseph W. Jones Ecological Research Center, Newton, GA 39870. 2Warnell School of
Forestry and Natural Resources, University of Georgia, Athens, GA 30602. *Corresponding
author - michelina.dziadzio@gmail.com.
Manuscript Editor: Max Nickerson
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Gopher Tortoises excavate burrows in deep, well-drained, sandy soils; the burrows
average 4.6 m long and 2 m deep (Hansen 1963). Gopher Tortoise burrows
can be identified by their characteristic half-moon–shaped tunnel and the mound
of sand at the burrow entrance, called the burrow apron (Cox et al. 1987). Burrow
width is highly correlated to the length of the tortoise occupying the burrow
(Doonan and Stout 1994), and adult burrows (>23 cm in width; Alford 1980) have
a 29° angle of declination (Hansen 1963). Because tortoise burrow depth increases
gradually, there is a thermal gradient from the entrance to the bottom of the burrow;
temperature and humidity become increasingly stable toward the burrow end,
where it remains fairly constant at ~27° C throughout the year (Douglass and Layne
1978, Pike and Mitchell 2013). Other species may modify existing Gopher Tortoise
burrows by excavating side channels within the burrow (Kinlaw and Grasmueck
2012), creating additional structural and thermal complexity.
Species relationships to Gopher Tortoise burrows have been described as “obligate
commensal” or “facultative associate”, and burrow associates have been
described as frequent or occasional (Cox et al. 1987, Jackson and Milstrey 1989).
While both obligate commensals and associate species use Gopher Tortoise burrows,
the former, by definition, are thought to require the burrows to survive,
whereas the latter are not dependent on them (Jackson and Milstrey 1989, Young
and Goff 1939). Jackson and Milstrey (1989) classified species as frequent burrow
associates if there were at least 10 records of the species using burrows, and suggested
data on frequency of burrow use by many species were limited. Burrow use
may vary by habitat, season, and burrow status (Eisenberg 1983, Hyslop et al. 2009,
Kent and Snell 1994, Lips 1991, Witz et al. 1991). For example, in the northern portion
of its range, Drymarchon couperi Holbrook (Eastern Indigo Snake) is thought
to be a Gopher Tortoise burrow commensal, though their use of burrows varies
seasonally, with peak use in winter months (Hyslop et al. 2009). Some species
exhibit positive associations with “active” tortoise burrows, including Lithobates
capito LeConte (Gopher Frog; Eisenberg 1983). Active burrows are those which
are occupied or were recently occupied by a Gopher Tortoise. This association may
be related to higher invertebrate abundance in active burrows, creating greater food
availability for insectivorous species (Witz et al. 1991).
Previous studies examining the use of Gopher Tortoise burrows by vertebrate associates
have used funnel traps (Lips 1991) and burrow excavation (Kent and Snell
1994, Witz et al. 1991) to sample burrows. Passive sampling techniques, which
allow an assessment of frequency of use and also capture activities of associate
species are much less common (see Alexy et al. 2003). We monitored active and
inactive Gopher Tortoise burrows with motion-triggered trail cameras to determine
frequency of use of Gopher Tortoise burrows and burrow aprons by vertebrates.
Field-Site Description
Our study was conducted at the 11,600-ha Joseph W. Jones Ecological Research
Center at Ichauway, located in Baker County, GA. The study site consisted of
primarily Longleaf Pine forest with a sparse midstory. Native ground cover was
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dominated by Wiregrass, Andropogon spp. (bluestem), and legumes (Fabaceae).
Upland habitats were managed with prescribed fire on a ~2-year return interval.
Gopher Tortoise density on this site was 0.71 ± 0.10 tortoises per ha; burrow density
was 2.46 ± 0.24 burrows per ha (L.L. Smith, unpubl. data).
Methods
Between 2 June and 9 October 2014, we monitored 34 active and 20 inactive
adult Gopher Tortoise burrows (i.e., tortoise burrow width >23 cm; Alford 1980)
that contained an artificial or natural Gopher Tortoise nest in the burrow apron
(Dziadzio et al. 2016). Burrows were classified as active if we observed signs of
recent tortoise activity such as fresh scat and tortoise tracks on the burrow apron,
and inactive if the apron lacked fresh scat or tortoise tracks (Auffenberg and
Franz 1982).
We used motion-triggered trail cameras (UWAY VH400HD, Norcross, GA)
mounted on 5 cm × 5 cm × 107 cm wooden stakes within 1–2 m from the burrow
entrance to identify vertebrate burrow visitors. We checked cameras daily, and videos
were date and time stamped and stored on digital memory cards (SanDisk 8GB
SDHC, SanDisk Corporation, Milpitas, CA). We reviewed videos to determine
behavior and frequency of use of burrows and aprons by vertebrate associates. To
determine temporal differences in burrow use, we considered day observations as
those between 0630 h and 2029 h and night observations as those between 2030 h
and 0629 h. Observations of movement (i.e., hopping, running, walking, etc.) were
classified as “moving”. We classified as “stationary” animals that were motionless
during the length of the video clip, and as “foraging” animals that were observed
eating or carrying away plant material, or depredating natural or artificial tortoise
nests in burrow aprons. Finally, the “other” category included rarely observed
behaviors such as dust bathing and calling by birds, investigation of trail cameras
by mammals, and behaviors that could not be determined. We considered multiple
videos with a lapse time of less than 10 min to be a single event to minimize bias due to
duration of time an individual spent at the burrow apron. Because we could not distinguish
between species on video, we combined all mouse observations. Possible
species included Peromyscus gossypinus LeConte (Cotton Mouse), Ochrotomys
nuttalli Harlan (Golden Mouse), Mus musculus L. (House Mouse), and Peromyscus
polionotus Wagner (Oldfield Mouse) (Smith et al. 2006). Some individual anurans
and birds could not be identified to species.
Results
Our trail cameras recorded a total of 12,238 videos between 2 June and 9 October
2014, of which 10,151 (83%) contained a Gopher Tortoise. We reduced multiple
videos of an individual to 1 event and removed Gopher Tortoise and unknown
observations, resulting in 929 recorded burrow visits by vertebrate associates. Seventy
video events contained more than 1 individual, 28 of which were conspecifics.
We observed 14 vertebrate species using Gopher Tortoise burrows and 34 species
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using burrow aprons (Fig. 1). Mammals were the most commonly recorded taxa,
with 504 visits by 11 species, followed by birds with 298 visits by 17 species.
Trap effort varied between active (n = 1532 trap nights, i.e., a 24-hr period)
and inactive (n = 767 trap nights) burrows. We calculated observations per 100
trap nights for both burrow-activity classes and found a difference in frequency of
use by vertebrates between active and inactive burrows and aprons (Fig. 1). Active
burrows were visited more frequently than inactive burrows by all taxa, and
several species were observed exclusively at active burrows, including the Gopher
Frog, Thryothorus ludovicianus Latham (Carolina Wren), and Colinus virginianus
L. (Northern Bobwhite) (Fig. 1). We also observed several species exclusively at
inactive burrows (e.g., Sciurus niger L. [Fox Squirrel] and Mephitis mephitis Schreber
[Striped Skunk]), but these observations were based on only a few individuals
captured by trail cameras (Fig. 1). Several species, including Peucaea aestivalis
M.H.K. Lichtenstein (Bachman’s Sparrow), Aspidoscelis sexlineata L. (Six-lined
Racerunner), and the “mouse” group, were observed at both burrow categories but
most frequently at active burrows (Fig. 1).
We recorded 708 individual events of 34 species using Gopher Tortoise burrow
aprons. The highest species diversity observed on burrow aprons was among
birds (n = 17 species). Bachman’s Sparrow was the most common bird recorded,
observed at 11.6% of all trap nights (Fig. 1). Behaviors were different between
species, but similar within taxa (Table 1). The most frequently observed behavior
Figure 1. Vertebrate observations at active and inactive Gopherus polyphemus (Gopher
Tortoise) burrows and aprons between 2 June to 9 October 2014 at Ichauway, Baker County,
GA. Observations for each species were calculated for 100 trap nights at each burrow type
because of unequal trap effort at active (n = 1532 trap nights) and inactive burrows (n =
767 trap nights).
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Table 1. Observations of vertebrates at Gopher Tortoise (Gopherus polyphemus) burrows and aprons
from 2 June to 9 October 2014 at Ichauway, Baker County, GA. Behaviors were classified as “moving”
(M), which referred to movement behavior (i.e., hopping, walking, running, and entering or
exiting the burrow); “stationary” (S) when an animal remained still through the duration of the video;
“foraging” (F) when an animal was observed actively foraging on the burrow apron; or “other” (O),
which included rarely observed and unknown behaviors.
Behavior
(% of observations)
Common name Species M S F O
Mammals (total) 75 9 15 1
Coyote Canis latrans Say 67 0 0 33
Eastern ChipmunkA Tamias striatus L. 100 0 0 0
Eastern Cottontail Sylvilagus floridanus J.A. Allen 57 42 2 0
Hispid Cotton Rat Sigmodon hispidus Say and Ord 86 14 0 0
Mouse spp. Mouse spp. 89 8 3 0
Nine-Banded ArmadilloB Dasypus novemcinctus L. 62 1 37 1
Raccoon Procyon lotor L. 51 0 40 9
Sherman's Fox Squirrel Sciurus niger shermani Moore 100 0 0 0
Striped Skunk Mephitis mephitis Schreber 100 0 0 0
Virginia Opossum Didelphis virginiana Kerr 83 0 17 0
White-tailed DeerA Odocoileus virginianus Zimmermann 67 8 25 0
Birds (Total) 64 11 20 5
Bachman’s Sparrow Peucaea aestivalis Lichenstein 63 8 22 6
Bird spp. Bird spp. 69 13 16 3
Blue GrosbeakA Passerina caerulea L. 0 0 100 0
Blue JayA Cyanocitta cristata L. 0 0 100 0
Brown ThrasherA Toxostoma rufum L. 100 0 0 0
Carolina Wren Thryothorus ludovicianus Latham 89 6 6 0
Common Ground-DoveA Columbina passerina L. 100 0 0 0
Crow sp.A Corvus sp. 50 50 0 0
Eastern BluebirdA Sialia sialis L. 0 0 0 100
Florida Burrowing Owl Athene cunicularia floridana Ridgway 0 43 57 0
Great Crested FlycatcherA Myiarchus crinitus L. 20 40 0 40
Indigo BuntingA Passerina cyanea L. 100 0 0 0
Mourning DoveA Zenaida macroura L. 81 10 10 0
Northern Bobwhite Colinus virginianus L. 88 12 0 0
Northern MockingbirdA Mimus polyglottos L. 67 8 17 8
Pine WarblerA Setophaga pinus Wilson 100 0 0 0
Tufted TitmouseA Baeolophus bicolor L. 0 0 100 0
Wood ThrushA Hylocichla mustelina Gmelin 0 100 0 0
Amphibians (total) 29 71 0 0
Anuran spp. Anuran spp. 29 71 0 0
Eastern Spadefoot Toad Scaphiopus holbrookii Harlan 67 33 0 0
Gopher Frog Lithobates capito LeConte 6 94 0 0
Southern Toad Anaxyrus terrestris Bonnaterre 52 48 0 0
Reptiles (total) 89 0 7 4
Black Racer Coluber constrictor L. 100 0 0 0
Eastern Coachwhip Coluber flagellum Shaw 82 0 0 18
Eastern Hog-Nosed Snake Heterodon platyrhynos Latreille 50 0 50 0
Six-Lined Racerunner Aspidoscelis sexlineata L. 94 0 6 0
ASpecies not previously described using tortoise burrows or burrow aprons.
BNon-native species.
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classification was moving among mammals (75%), birds (64%), and reptiles (89%)
and stationary among amphibians (71%). Birds spent the most time foraging on the
burrow apron (20%), followed by mammals (15%). Other observed behaviors included
birds dust bathing (n = 5), collecting vegetation (n = 8), and calling (n = 1),
and mammals investigating trail cameras (n = 3).
There was a difference in the temporal pattern of burrow visits among taxa.
Mammals (n = 448) and amphibians (n = 61) were most frequently observed at
night, between 2030 and 0629 h, whereas birds (n = 269) and reptiles (n = 45) were
most commonly observed during the day, between 0630 and 2029 h (Fig. 2). Nocturnal
bird observations were the result of Athene cunicularia floridana Ridgway
(Florida Burrowing Owl; n = 14) foraging on a burrow apron between 2300 and
0516 h, and passerines at burrow aprons up to 2 hours before dawn, from 0435 to
0629 h (n = 15).
Discussion
This study provides novel information about the frequency with which vertebrate
taxa used tortoise burrows and burrow aprons. Many studies have examined
vertebrates using tortoise burrows (e.g., Alexy et al. 2003, Jackson and Milstrey
1989, Kent and Snell 1994, Lips 1991, Witz et al. 1991), but data documenting use
of burrow aprons are much more limited. Mammals were the most commonly observed
taxa, with more than 500 visits by at a total of at least 11 species, followed
by birds, with nearly 300 visits by 17 species. We found birds used burrow aprons
Figure 2. Vertebrate observations at Gopher Tortoise (Gopherus polyphemus) burrows
and aprons monitored using motion sensor cameras between 2 June to 9 October 2014 at
Ichauway, Baker County, GA. Day observations were between 0630 h and 2029 h and night
observations were between 2030 h and 0629 h.
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as foraging sites, including species not previously known to be associated with
tortoise burrows, such as Zenaida macroura L. (Mourning Dove) and Mimus polyglottos
L. (Northern Mockingbird). Bachman’s Sparrows have been documented
occasionally using Gopher Tortoise burrows as a refuge (Pittman 1960, Stevenson
2013), but Gopher Tortoise burrows may also benefit Bachman’s Sparrows in other
ways. Bachman’s Sparrows are strictly ground-foragers (Allaire and Fisher 1975),
and their abundance appears to be positively correlated with percent bare ground
and negatively correlated with increases in understory density and height (Cox and
Jones 2009). The open sand at burrow aprons may be important to Bachman’s Sparrows,
especially in areas of marginal habitat where fire suppression has resulted in
a dense understory and midstory.
Overall, active Gopher Tortoise burrows and burrow aprons were used more
frequently than inactive burrows, suggesting active burrows provide additional
resources for associate species. We did not examine if burrow occupancy by a tortoise
impacted vertebrate associate use, but previous research suggests there is no
effect (Kent and Snell 1994, Witz et al. 1991). Active burrows may contain more
tortoise scat than inactive burrows, which could have cascading effects on burrow
use by associates (Kent and Snell 1994, Lips 1991). The presence of scat may attract
coprophagous invertebrates (Young and Goff 1939), which may increase the
abundance of insectivorous predators, potentially leading to an increase in abundance
of carnivorous predators (Lips 1991).
Use of trail cameras to record burrow visits may have biased our data against observations
of small species, including lizards and toads, because their movements
may not have triggered the cameras. Also, our study took place during the tortoise
nesting season, from June through October, and burrow use by other vertebrate species
may differ in late fall, winter, and spring. It is also likely that we observed more
mesomammals than would naturally occur during the sampling period because they
are the primary predators of Gopher Tortoise nests (Dziadzio et al. 2016, Landers et
al. 1980). Despite these limitations, trail cameras were a useful tool to examine use of
Gopher Tortoise burrows and aprons without altering the behavior of most species.
Acknowledgments
We are grateful to the Warnell School of Forestry and Natural Resources, the Joseph W.
Jones Ecological Research Center, and the Gopher Tortoise Council for financial support.
We also thank G. Morris, B. O’Hanlon, and B. Schlimm for assistance with species identification
and J. Howze for providing helpful suggestions on an earlier draft of the manuscript.
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