Freshwater Mussels (Unionidae) in the Paint Rock River
(Jackson, Madison, and Marshall Counties), Alabama
Todd B. Fobian, Michael L. Buntin, Jesse T. Holifield, Thomas A. Tarpley, Jeffrey T. Garner, and Paul D. Johnson
Southeastern Naturalist, Volume 13, Issue 2 (2014): 347–366
Full-text pdf (Accessible only to subscribers.To subscribe click here.)
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22001144 SOUTHEASTERN NATURALIST 1V3o(2l.) :1334,7 N–3o6. 62
Freshwater Mussels (Unionidae) in the Paint Rock River
(Jackson, Madison, and Marshall Counties), Alabama
Todd B. Fobian1,*, Michael L. Buntin1, Jesse T. Holifield1, Thomas A. Tarpley1,
Jeffrey T. Garner2, and Paul D. Johnson1
Abstract - The Paint Rock River (PRR) drainage in northern Alabama and southern Tennessee
historically supported 58 freshwater mussel species. This study semi-quantitatively
examined the mussel assemblage at 42 sites in the Paint Rock mainstem and 5 sites in Estill
Fork, a headwater tributary. A total of 1825 live mussels were collected over 78.9 personhours,
with an overall catch per unit effort (CPUE) of 23.1 mussels/person-hour. Forty-one
species were collected live and/or fresh dead, including federally protected Epioblasma
triquetra (Snuffbox), Fusconaia cor (Shiny Pigtoe), Lampsilis abrupta (Pink Mucket),
Lampsilis virescens (Alabama Lampmussel), Pleuronaia dolabelloides (Tennessee Pigtoe),
Quadrula cylindrica cylindrica (Rabbitsfoot), and Toxolasma cylindrellus (Pale Lilliput).
The river system continues to support a high diversity of mussels (48 species collected in
the past 25 years). The survey also identified several sites in the basin suitable for the reintroduction
of extirpated species.
Introduction
The Paint Rock River (PRR) drainage in northern Alabama and southern Tennessee
is identified as a global hotspot for aquatic biodiversity, historically supporting
58 freshwater mussel and 98 fish species (Boschung and Mayden 2004, Williams
et al. 2008). Surveys over the past 25 years indicate the continued presence of at
least 48 mussel species (Godwin 2002, Williams et al. 2008), including Cumberlandian
Basin endemics, whose range is limited to the upper and middle Tennessee
and Cumberland River watersheds. Currently, 10 of 58 documented mussel species
appear extirpated from the drainage, including four federally protected and two extinct
species. Eight federally protected species are currently extant (USFWS 1976,
2011; Williams et al. 2008).
This survey is part of a multifaceted effort by the Alabama Aquatic Biodiversity
Center (AABC; Alabama Department of Conservation and Natural Resources
[ADCNR]), Marion, AL, to restore the PRR mussel fauna. Due to the high species
richness and improved habitat quality over the past two decades as a result of the
ADCNR Landowner Incentive Program and efforts by The Nature Conservancy
(TNC), the river is identified as a primary location for Cumberlandian mussel
restoration efforts (CRMRC 2010). Mussel recovery through reintroduction, translocation,
and augmentation is a viable restoration strategy identified by the USFWS
and NMFS (2000).
1Alabama Division of Wildlife and Freshwater Fisheries, 2200 Highway 175, Marion, AL
36756, (334) 683-5000. 2Alabama Division of Wildlife and Freshwater Fisheries, 350 County
Road 275, Florence, AL 35633.*Corresponding author - todd.fobian@dcnr.alabama.gov.
Manuscript Editor: Arthur Bogan
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Prior to commencement of species-restoration activities, a thorough assessment
of the current mussel population was necessary. Previous mussel surveys of
the mainstem river were completed in 1980 (Ahlstedt 1986) and 1991 (Ahlstedt
1995), and headwaters tributaries (Estill Fork, Larkin Fork, and Hurricane Creek)
were last surveyed in 1995 and 2002 (Godwin 2002; McGregor and Shelton 1995).
Mussel species historically inhabiting the river system can be inferred based on
the following sources: Ortmann (1925), a summary of multiple collector’s material
prior to 1925; Johnson et al. (2008), a catalog of curator Herbert D. Athearn’s
mollusk collection that were acquired between the years of 1957–1969; Isom and
Yokley (1973), a mussel-fauna report between1965–1967; and Williams et al.
(2008), a comprehensive review of US museum material. The present study updates
the freshwater mussel inventory of the PRR and recommends priority restoration
actions to improve mussel populations within the drainage.
Fieldsite Description
The PRR is located in Jackson, Madison, and Marshall counties in northeast
Alabama (Fig. 1). The river flows southwest along the southern edge of the Cumberland
Plateau for 97 river km (rkm; 60 river miles [rm]), confluencing with
the Tennessee River at TRM 343.2. The lower 21 rkm (13 rm) is impounded by
Wheeler Reservoir. The river drainage area encompasses 1186 km2 (458 mi2) and
includes three major headwater tributaries: Larkin Fork, Estill Fork, and Hurricane
Creek. Estill Fork and Hurricane Creek originate in Franklin County, TN,
and flow south where they join to form the PRR. The upper headwaters of the
river system generally have narrow floodplains adjacent to forested mountains.
These areas have a low residential density, and land use is primarily large farms
and commercial timberlands. Lower reaches of the watershed consist of a wider
river valley floodplain with a narrow riparian zone usually surrounded by pasture
and row crops (Ahlstedt 1995).
The PRR drainage was severely affected in past decades by small impoundments,
stream channelization, erosion, and agricultural runoff. These habitat
influences have led to the possible extirpation of 10 mussel and 8 fish species from
the river within the past 75 years (Boschung and Mayden 2004, Mirarchi 2004,
Williams et al. 2008). A major detrimental impact on habitat occurred with the
channelization and removal of snags and riverbank timber in the upper drainage
and the lower reaches of Larkin and Estill forks and Hurricane Creek by the US
Army Corps of Engineers during the 1960s (Ahlstedt 1995). This direct headwater
habitat manipulation was probably a large contributor to freshwater mussel loss
in the drainage. Wheeler Dam was completed by the Tennessee Valley Authority
(TVA) in 1936, resulting in loss of most of the mussel fauna and riverine habitat in
the lower 21 km of PRR (Ahlstedt 1995). Loss of habitat and fragmentation created
by impoundments is the leading cause of decline and extinction of North American
mollusk species (Vaughn and Taylor 1999).
Continuing threats to the watershed include siltation and erosion from poor
farming practices along with commercial and residential development (Godwin
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Figure 1. Paint Rock River drainage mollusk survey sites in Jackson, Madison, and Marshall
counties, AL.
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2002). A heavy layer of silt can suffocate entire mussel beds and has contributed
to extirpation of mussels in several rivers (Anderson et al. 1991). Specific activities
that increase siltation and erosion include clearing of riparian vegetation,
cattle access/grazing, timber clear cutting, head cutting, gravel mining, in-stream
ATV traffic, and runoff from poor farming and construction practices (Vaughn
and Taylor 1999).
Nonpoint source agricultural runoff and chemical spills are also a threat. There
appears to be direct and inadvertent impacts from some of the widely used pesticides,
herbicides, and fertilizers, but many of the potential effects are still not
fully understood (Cope et al. 2008). Uncertainties remain about the relationship of
laboratory data to actual contaminant exposure routes for various mussel species
and life stages. Additional research is needed to understand these complex environmental
interactions so that the risks of exposures can be properly assessed and
managed (Cope et al. 2008, Milam et al. 2005).
Methods
Free-flowing sections of the river were float surveyed by kayak (RM 14–60)
and motor boat (RM 5–14) in June, July, and August 2008, and an additional 10
rkm (6 rm) of Estill Fork, was kayaked and surveyed in June 2008. We used US
Geological Survey (7.5-minute) topographical maps and a hand held global positioning
system (GPS) (Magellan Meridian Platinum unit, WAAS enabled) for
navigation and sample-site location. The GPS coordinates were verified and plotted
on topographical maps using Maptech Terrain Navigator GIS software. We based
sampling-site selection on three criteria: 1) presence and abundance of live mussels
and fresh dead shell, 2) stream-bank and channel stability, and 3) maintenance of
uniform spacing of sites throughout the study area. Searches focused on shoal areas
consisting of riffles, runs, and shallow pools.
The total amount of time spent sampling was recorded as catch per unit effort
(CPUE), a semi-quantitative method used for determining the number of mussels
collected per person-hour (ph). This technique is reliable for estimating total species
richness and locating rare species, the primary goal of this study (Obermeyer
1998). Each site was sampled by a three-person crew.
Collection methods included snorkeling, visual searching, and hand grubbing. We
collected all mussels encountered within a sampling reach approximately 50–100 m
long. Collected mussels were placed in net bags and taken to shore where they were
identified and counted. Taxonomy followed that of Williams et al. (2008). Mussel
species considered abundant were counted in situ and left undisturbed in the substrate.
We determined maximum total length by measuring the distance from the
anterior to posterior end of the shell margins parallel to the hinge line to the nearest
millimeter (mm) using vernier calipers. Collecting time varied among sites and continued
until no additional species were present and all suitable habitats adequately
examined. Live individuals were returned to location of capture.
Dead shells were gathered along the shore, streambed, and feeding stations
(middens) left by Ondatra zibethica (L.) (Muskrat), and were classified as fresh
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dead (shiny nacre, intact hinge ligament, decomposing tissue inside shell), weathered
dead (dull nacre, relatively intact periostracum), and relic (chalky nacre, flaky
or absent periostracum). Shell materials from different sites were segregated, labeled,
and curated at the North Carolina Museum of Natural Science (NCMNS) in
Raleigh, NC.
Recorded site descriptions include date and general habitat information. We
took site photographs and described the distribution of mussel beds. These details
are not included in this manuscript, but are on file at the Alabama Aquatic Biodiversity
Center (AABC).
Results
During this study, we assessed a total of 46 sites in the PRR system, including
5 in Estill Fork and 41 in the mainstem (Tables 1, 2). The mainstem covered 88.5
rkm (55 rm; from PRR mile [RM] 5–60; Fig. 1). River discharge was 302 cfs and
196 cfs, respectively, during the first two sampling trips in June 2008. However,
flows ranged from 12–24 cfs for the remainder of the sampling trips in July and
August (USGS gage station # 03574500 Woodville, AL). In all, 1825 live mussels
were collected during 78.9 ph (mean = 1.7 ph/site, range = 0.5–5.3 ph/site). Overall
CPUE was 23.1 live mussels/ph. Forty-one species were found live and/or fresh
dead, and all species occurred in the mainstem except Medionidus conradicus (Lea)
(Cumberland Moccasinshell) and Toxolasma cylindrellus (Lea) (Pale Lilliput),
which were found only in Estill Fork.
The most abundant species encountered was Amblema plicata (Say) (Threeridge),
which comprised 30.0% of the cumulative total, followed by Quadrula
cylindrica cylindrica (Say) (Rabbitsfoot; 12.0%), Quadrula verrucosa (Rafinesque)
(Pistolgrip; 8.2%), Lampsilis ovata (Say) (Pocketbook; 7.9%), Potamilus
alatus (Say) (Pink Heelsplitter; 7.2%), and Cyclonaias tuberculata (Rafinesque)
(Purple Wartyback; 6.0%). The remaining species were all below 4.0% in relative
abundance.
The most widely distributed mussel was Villosa vanuxemensis (Lea) (Mountain
Creekshell), which was found at 63.8% of the sites sampled, followed by A. plicata
at 61.7%, Lampsilis fasciola (Rafinesque) (Wavyrayed Lampmussel) at 61.7%,
L. ovata at 57.4%, Villosa iris (Lea) (Rainbow) at 55.3%, and Pleuronaia barnesiana
(Lea) (Tennessee Pigtoe) at 48.9%. The remaining species were detected at
fewer than 45.0% of the sites.
Table 1. Estill Fork river mile/kilometer (RM/KM), locality, and latitude/longitude coordinates for
sites sampled during summer 2008 in Jackson County, AL.
RM/KM Locality Coordinates
EF 5.6/9.0 Downstream of Burks Creek confluence N34º 57.759', W86º 09.241'
EF 3.6/5.8 Upstream of Reid Hollow tributaries N34º 56.332', W86º 09.355'
EF 2.8/4.8 Downstream of Houston Hollow confluence N34º 55.793', W86º 09.562'
EF 2.2/3.5 Northeast of Estill Fork N34º 55.327', W86º 09.533'
EF 1.0/1.6 Upstream of Freedom Bridge N34º 55.330', W86º 09.528'
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The following species were represented by single live individuals: Ellipsaria
lineolata (Rafinesque) (Butterfly), Elliptio dilatata (Rafinesque) (Spike), Fusconaia
ebena (Lea) (Ebonyshell), M. conradicus, Pleurobema cordatum (Rafinesque)
(Ohio Pigtoe), Pleurobema rubrum (Rafinesque) (Pyramid Pigtoe), Pyganodon
grandis (Say) (Giant Floater), and T. cylindrellus. Other relatively rare species, represented
by five or fewer individuals, included: Actinonaias ligamentina (Lamarck)
Table 2. Paint Rock river mile/kilometer (RM/RKM), locality, and latitude/longitude coordinates for
sites sampled during summer 2008 in Jackson, Madison, and Marshall Counties Alabama.
RM/RKM Locality Coordinates
60.0/96.6 Hurricane Creek confluence N34º 53.883', W86º 10.237'
59.8/96.2 East of Bostik Hill Church N34º 53.753', W86º 10.315'
59.6/95.9 Upstream of private bridge N34º 53.545', W86º 10.400'
59.4/95.6 Downstream of private bridge N34º 53.397', W86º 10.483'
59.2/95.3 Downstream of Henshaw Cove N34º 53.293', W86º 10.497'
59.1/95.1 East of Henshaw Cemetery N34º 52.198', W86º 10.674'
59.0/95.0 Southeast of Henshaw Cemetery N34º 53.069', W86º 10.898'
58.3/93.8 West of Bouldin Cemetery N34º 52.739', W86º 11.277'
58.0/93.3 Upstream of Robertson Cove confluence N34º 52.655', W86º 11.341'
57.5/92.5 West of Swaim N34º 52.162', W86º 11.536'
56.7/91.2 Upstream of Fowler Cove tributaries N34º 51.598', W86º 11.935'
56.2/90.4 Downstream of Fowler Cove tributaries N34º 51.603', W86º 12.203'
55.3/89.0 Downstream of Larkin Fork confluence N34º 51.674', W86º 12.649'
54.7/88.0 Northeast of Church Hill Cemetery N34º 51.510', W86º 13.001'
53.9/86.7 Downstream of County Road 142 bridge N34º 51.017', W86º 13.302'
53.3/85.8 West of Princeton N34º 50.657', W86º 13.601'
52.3/84.2 Upstream of Cowen Hollow confluence N34º 51.031', W86º 13.952'
50.7/81.6 Upstream of gravel ford N34º 49.225', W86º 14.615'
50.3/81.0 Upstream of Graham Cove confluence N34º 49.093', W86º 14.339'
48.4/77.9 Downstream of County Road 12 bridge N34º 47.826', W86º 14.418'
48.2/77.6 Downstream of County Road 12 bridge N34º 47.330', W86º 14.396'
46.7/75.2 South of Hollytree N34º 46.762', W86º 14.950'
44.4/71.5 Upstream of Frazier Cove confluence N34º 45.434', W86º 14.246'
43.6/70.2 Downstream of County Road 20 bridge N34º 44.898', W86º 13.906'
42.0/67.6 Downstream of Flippo Ford N34º 44.224', W86º 14.198'
38.5/62.0 North of Gilliam Spring N34º 43.303', W86º 16.709'
36.5/58.7 Downstream of heavy equipment ford N34º 42.861', W86º 18.122'
34.3/55.2 Downstream of Big Lake bridge N34º 41.868', W86º 18.604'
33.7/54.2 Downstream of Hales Cove confluence N34º 41.414', W86º 18.658'
33.3/53.6 Upstream of gravel ford N34º 41.245', W86º 18.610'
30.0/48.3 Downstream of Whitaker Preserve N34º 38.978', W86º 19.107'
29.2/47.0 Upstream of Webb Hollow confluence N34º 39.318', W86º 19.512'
27.6/44.4 West of Splitrock Mountain N34º 38.266', W86º 18.514'
25.2/40.6 Downstream of Stillhouse Branch N34º 36.652', W86º 19.331'
21.2/34.1 Upstream of Butler ’s Mill bridge N34º 34.880', W86º 18.080'
20.6/33.2 Downstream of Butler's Mill bridge N34º 34.711', W86º 18.368'
19.0/30.6 Bend upstream of Tremble Creek N34º 34.396', W86º 19.904'
18.2/29.3 Bend downstream of Tremble Creek N34º 33.886', W86º 19.631'
16.7/26.9 Near Butlers Mill Road bend N34º 33.545', W86º 18.475'
15.5/24.9 Downstream of Fish Trap Ford N34º 32.665', W86º 18.743'
13.1/21.1 Downstream of Buck Ford N34º 31.090', W86º 19.915'
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(Mucket), Lampsilis teres (Rafinesque) (Yellow Sandshell), Lampsilis virescens
(Lea) (Alabama Lampmussel), Quadrula pustulosa (Lea) (Pimpleback), Truncilla
donaciformis (Lea) (Fawnsfoot), and Truncilla truncata (Rafinesque) (Deertoe).
Two live A. ligamentina were found at Paint Rock RM 43.6. Prior to this survey,
this species was last reported live in Alabama from Wheeler Reservoir in the
early 1990s with no indication of abundance (Bowen et al. 1994), and subsequent
status assessments of freshwater mussels in this Tennessee River reach indicate
that if present it is very rare (Garner and McGregor 2001). Obovaria subrotunda
(Rafinesque) (Round Hickorynut), occurred at 10% of the sites sampled, but was
only collected fresh dead; no live specimens were found. Another rare species,
Lampsilis abrupta (Say) (Pink Mucket), was not found during this survey, but a
fresh-dead individual was collected during the survey period (Paul Freeman, TNC,
Birmingham, AL, pers. comm.). A lotic-habitat specialist, Utterbackia imbecillis
(Say) (Paper Pondshell), was collected fresh dead from Cole Spring Branch, a PRR
tributary, on 25 November 2007 (Paul Freeman, pers. comm.). Three species were
represented by weathered dead and/or relic shells only: Fusconaia cuneolus (Lea)
(Finerayed Pigtoe), Ligumia recta (Lamarck) (Black Sandshell), and Quadrula
quadrula (Rafinesque) (Mapleleaf).
Seven sites had mussel species richness ≥19 live or fresh dead, and 12 sites had
a CPUE of ≥19 live mussels per ph. (Appendix 1). Sites with both high species
richness and CPUE included RM 48.2, RM 43.6, RM 34.3, RM 33.3, and RM 19.0.
Based on our survey results, these five localities were considered the best mussel
habitat in the river.
We observed evidence of recent recruitment for 26 species as indicated by the
presence of subadult/juvenile age classes (1–5 annuli, ≤50 mm shell length for most
medium-to-large species). Populations of abundant mussels, A. plicata, Q.c. cylindrica,
C. tuberculata, and Pleuronaia dolabelloides (Lea) (Slabside Pearlymussel),
appeared healthy and comprised of several age classes, though most individuals
were large adults. Interestingly, subadult Fusconaia subrotunda (Lea) (Longsolid)
and Pleurobema oviforme (Conrad) (Tennessee Clubshell) outnumbered older individuals
of those species.
Species of Conservation Concern
Of the twelve federally protected mussel species historically present in the
PRR system, we encountered only seven live or fresh dead: Epioblasma triquetra
(Rafinesque) (Snuffbox), Fusconaia cor (Conrad) (Shiny Pigtoe), L. abrupta
(1 fresh dead), L. virescens, P. dolabelloides, Q.c. cylindrical, and T. cylindrellus.
Only weathered dead and relic shells of F. cuneolus were collected. All federally
protected species and candidates encountered are considered priority 1 (species of
highest conservation concern in Alabama; Mirarchi 2004). In the Cumberlandian
Region Mollusk Recovery Plan, F. cor, F. cuneolus, L. virescens, and T. cylindrellus
are tier 1 species (highest priority); P. dolabelloides is tier 2; and E. triquetra,
L. abrupta, and Q.c. cylindrica are tier 3 (CRMRC 2010). Federally protected
species historically found in the PRR but not collected during this survey are
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Epioblasma capsaeformis (Lea) (Oyster Mussel), Epioblasma florentina (Lea)
(Yellow Blossom), Pleurobema plenum (Lea) (Rough Pigtoe), and Villosa trabalis
(Conrad) (Cumberland Bean).
Epioblasma triquetra
This survey collected 21 live individuals from seven sites and fresh dead from
eight sites (RM 46.7–13.1). The sizes ranged from 9–52 mm in length, and 15 sexually
mature individuals yielded a 3:2 male-to-female ratio. Epioblasma triquetra
appears to be recruiting and viable, and its presence in PRR is considered the best
of only two known Alabama populations.
Fusconaia cor
This survey collected seven live F. cor from three sites (RM 43.6, RM 33.3, and
between RM 34.3–33.7), and fresh dead from two sites (RM 48.2 and RM 46.7).
Weathered dead shells also occurred at six sites (RM 25.2–RM 59.05). The size range
of live individuals was 21–80 mm in length. RM 43.6, at which five of the seven live
specimens were found, had a CPUE of 44.5 mussels/ph and a species richness of 20,
making it one of the best sites evaluated. The presence of a single live sub-adult and
multiple fresh dead juveniles suggests that F. cor is reproducing in PRR.
Fusconaia cuneolus
This survey did not yield any live Fusconaia cuneolus, but did find weathered
dead shells at RM 20.6 and relic shells at four sites. The identification of relic F. cuneolus
is difficult since they are very similar to those of F. cor, and the most discerning
differences between the two species (periostracum color and texture), are generally
absent. Fusconaia cuneolus has not been collected live in the river since 1991
(Ahlstedt 1995), when two old individuals were found at RM 13.3 and RM 16.0.
Lampsilis abrupta
This survey did not find any Lampsilis abrupta, but a single fresh-dead shell was
reported from RM 34.0 during the survey period (Paul Freeman, pers. comm.). No
additional individuals were found despite a concerted effort at RM 34.3. That site
was one of the best sampled, with a CPUE of 64.3 mussels/ph and species richness
of 23.
Lampsilis virescens
This survey found live Lampsilis virescens at three sites (RM 50.3, RM 48.2,
and Estill Fork mile 3.6), fresh dead at two (RM 53.9 and RM 52.3) weathered dead
shells at RM 50.7, and relic shells at RM 53.3. This mussel occurred at 10.6% of
sites surveyed. Extant populations were believed restricted to Estill Fork, but this
survey extended the known range downstream into the river (RM 48) where it is
rare. The size range of live individuals was 53–89 mm in length.
Pleuronaia dolabelloides
This survey collected a total of 66 live P. dolabelloides at 13 sites and fresh dead
from four (RM 59.05–13.1). The cumulative relative abundance of P. dolabelloides
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was 3.62%, and the size range of live individuals was 11–78 mm in length. Several
size classes are indicative of recent recruitment and healthy populations.
Quadrula c.cylindrica
This survey collected a total of 218 live Q.c.cylindrica from 18 sites and fresh
dead at one site (RM 56.7–RM 13.1). The size range of live individuals was 21–117
mm in shell length. Several size classes suggest recent recruitment and healthy
populations.
Toxolasma cylindrellus
This survey found one live gravid female at Estill Fork mile 5.6. A weathered
dead shell was collected from Estill Fork mile 2.2, and one relic valve was collected
from Estill Fork mile 1.0. The presence of a gravid female is a positive sign
of reproduction potential, but recruitment viability is unknown.
Discussion and Summary
There appears to have been little interest in the PRR mussel fauna prior to the
latter half of the 20th century, since there were no systematic surveys of the system
up to that point. Ortmann (1925) summarized early mussel records from the middle
and lower Tennessee River based on material collected by other individuals. Herbert
D. Athearn, a collector of southeastern aquatic mollusks visited several PRR
system sites from 1957–1969 and documented 39 mussel species, which he curated
privately (Johnson et al. 2008, Williams et al. 2008). His personal collection was
donated in 2007 to NCMNS where it was reviewed and is being databased (Johnson
et al. 2008, Williams et al. 2008). The first published account of PRR mussels was
Isom and Yokley (1973), who made several visits to the river from 1965–1967 and
reported 30 species from 6 sites. Subsequent surveys were more intensive, but results
were variable. The TVA surveyed the PRR in 1980 (Ahlstedt 1986) and again
in 1991 (Ahlstedt 1995), reporting 25 and 37 species, respectively. Godwin (2002)
reported only 19 species from a survey that was concentrated in the headwaters.
Williams et al. (2008) included a comprehensive review of museum material from
US institutions that house significant collections of mussel mat erial.
Parmalee and Bogan (1998) report 102 species of mussels known to occur in
the Tennessee River system and its tributaries; 58 species, approximately 57%,
are known from the PRR drainage (Ahlstedt 1995, Isom and Yokley 1973, Mc-
Gregor and Shelton 1995, Ortmann 1925). Based on the 41 species collected live
and/or fresh dead during this survey, the PRR system ranks among those with
the highest remaining mussel diversity in North America. For comparison, the
Duck and Clinch rivers in Tennessee are both nationally recognized as significant
conservation resources for their diverse mussel faunas (Hubbs et al. 2011, Jones
and Neves 2011). The Duck River historically supported 75 mussel species and
harbors 56 extant species (Ahlstedt et al. 2004). The Clinch River presumably
supports >40 mussel species (Ahlstedt 1991). The current PRR mussel assemblage
includes at least eight federally protected species (E. triquetra, F. cor,
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L. abrupta, L. virescens, P. dolabelloides, Q.c. cylindrical, and T. cylindrellus,
plus the potentially extant F. cuneolus). The mussel fauna is globally significant,
including the last remaining population of T. cylindrellus and one of two remaining
populations of L. virescens.
The PRR mussel fauna remains diverse and relatively healthy, but some species
are healthier than others. Recent recruitment and the presence of smaller size
classes suggest healthy populations observed for several species, including federally
protected E. triquetra, F. cor, and P. dolabelloides. Two species, P. oviforme
and F. subrotunda, have been eliminated from much of their former ranges and
are among species considered in the CRMRC (2010). Both mussels were more
commonly encountered as sub-adults rather than older individuals. Two species
previously thought extirpated from the drainage, A. ligamentina and L. abrupta,
were collected in the 2008 survey, and Lasmigona complanata (Barnes) (White
Heelsplitter) and U. imbecillus were subsequently found live by the authors.
Mussel species reported from the drainage within the last 25 years that were
not found during this survey are presented in Appendix 2. However, among those
listed are Alasmidonta viridis (Rafinesque) (Slippershell Mussel) and Lasmigona
holstonia (Lea) (Tennessee Heelsplitter); both species occur almost exclusively in
small headwater streams that were not covered in this survey. Weathered dead shells
of F. cuneolus found suggest that it may still occur in the PRR at very low densities.
Toxolasma parvum (Barnes) (Lilliput) is a widespread species that typically
occurs in lotic habitats, which are not prevalent in the river. A non-dated T. parvum
record near RM 30 (Williams et al. 2008) suggests it may still be extant despite not
being found. Alasmidonta marginata (Say) (Elktoe) was not collected, but a shell
was found in 2004 in a Muskrat midden near Whitaker Nature Preserve at RM 30
(Doug Shelton, private consultant, Mobile, AL, pers. comm.), which indicates its
continued persistence in the river. Two species more commonly found in big rivers,
L. recta and Quadrula metanevra (Rafinesque) (Monkeyface), are likely peripheral
to their primary distributions in larger rivers. Their density in PRR was probably always
low, and they might still persist at very low densities. Similarly, for all species
reported from the PRR in the last 25 years but not encountered during this survey,
the possibility exists that they are still extant but rare.
There have been some losses to the historically documented mussel fauna. Two
species are now considered extinct: Epioblasma biemarginata (Lea) (Angled Riffleshell)
and Epioblasma lenior (Lea) (Narrow Catspaw). Three species, P. plenum,
Pleurobema sintoxia (Rafinesque) (Round Pigtoe), and Q. quadrula, are primarily
big-river species, and the PRR was likely peripheral to their primary distributions.
Potamilus ohiensis (Rafinesque) (Pink Papershell) is also a big-river species that
has expanded its range into Alabama since impoundment of the Tennessee River
increased the prevalence of its preferred lotic habitats (Williams et al. 2008). The
only report of PRR P. ohiensis is Williams et al. (2008), and no date was provided
for the record. However, Ortmann (1925) reported P. ohiensis from adjacent Flint
River, indicating that the species occurred at least in the PRR vicinity prior to Tennessee
River impoundment. Other historically reported species include Actinonaias
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pectorosa (Conrad) (Pheasantshell), E. capsaeformis, E. florentina, and V. trabalis
(Appendix 2). All Epioblasma spp. disappeared from the PRR except E. triquetra,
and current numbers of that species appear to have increased (Ahlstedt 1995, Isom
and Yokley 1973).
In summary, the PRR drainage remains home to a diverse, globally significant
freshwater mussel assemblage, despite the loss of major faunal components due
to habitat alteration and poor land-use practices. However, past habitat perturbations
have diminished over time, and for over a decade, the Alabama TNC and
the ADCNR Landowner Incentive Program have worked to accelerate land-use
improvements. Also, great strides have been made in techniques for captive propagation
of mussels, and ADCNR has made a large investment in facilities dedicated
to that purpose at AABC. With these recent developments taken into account, pro -
tection of the remaining mussel assemblage appears promising, and restoration of
its extirpated fauna is a real possibility.
Acknowledgments
Thanks to Doug Fears and Paul Freeman of The Nature Conservancy for help with this
study. They provided river-access information, housing, local knowledge and shell material
during the survey efforts. Additional expertise in shell identification was provided by
Steven Ahlstedt, Mike Gangloff, and Art Bogan. Funding was provided by Section 6 of the
Endangered Species Act and the Alabama Division of Wildlife and Freshwater Fisheries.
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Appendix 1. Summary of PRR system mussel collections. Includes species collected at each site (denoted by Paint Rock meanstem and Estill Fork river
mile), search time, CPUE, and species richness. * = federally protected species, FD = fresh-dead shell, WD = weathered-dead shell, and R = relic shell.
Paint Rock River mainstem (RM)
Species 60.0 59.8 59.6 59.4 59.2 59.1 59.0 58.3 58.0 57.5 56.7 56.2 55.3 54.7 53.9
Actinonaias ligamentina
Amblema plicata R R R R R 4 4 FD 57 2 7
Cyclonaias tuberculata
Ellipsaria lineolata
Elliptio crassidens (Lamarck) 1 R
Elliptio dilatata
Epioblasma triquetra*
Fusconaia cor* WD WD
Fusconaia ebena
Fusconaia subrotunda 4 WD R 3 2 R
Lampsilis abrupta*
Lampsilis fasciola WD 1 1 FD WD R 1
Lampsilis ovata 1 R 2 5 1 9 R
Lampsilis teres
Lampsilis virescens* R FD
Lasmigona costata (Rafinesque) 1 FD 1 R 2 R R
Leptodea fragilis (Rafinesque)
Medionidus conradicus
Megalonaias nervosa (Rafinesque) R
Obliquaria reflexa Rafinesque
Obovaria subrotunda R R
Pleurobema cordatum
Pleurobema oviforme 1 FD
Pleurobema rubrum
Pleuronaia barnesiana R R R WD 2 1 FD 1 2 FD 2 R 2
Pleuronaia dolabelloides WD 1 R R R 1 2 R 1
Potamilus alatus 1 R 1
Ptychobranchus fasciolaris (Rafinesque) 1 WD R 2 1 R 3
Pyganodon grandis
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Paint Rock River mainstem (RM)
Species 60.0 59.8 59.6 59.4 59.2 59.1 59.0 58.3 58.0 57.5 56.7 56.2 55.3 54.7 53.9
Quadrula c.cylindrica* R R R 2 6 R
Quadrula pustulosa
Quadrula verrucosa 1 R R 2
Toxolasma cylindrellus*
Toxolasma lividum Rafinesque 2 WD FD FD
Truncilla donaciformis
Truncilla truncata
Villosa iris 1 FD FD 2 FD R
Villosa taeniata (Conrad) WD 1 9 WD WD 1 WD 4 FD
Villosa vanuxemensis 1 WD WD 2 1 WD FD WD FD FD FD FD 1
Search time (ph) 1.0 1.0 1.0 0.5 2.0 1.75 0.75 1.25 1.0 3.0 3.0 2.25 2.25 0.5 3.0
Total number of mussels 1 0 2 0 16 9 1 1 1 10 22 1 88 2 17
CPUE (mussels/hour) 1 0 0.5 0 8.0 5.1 1.3 0.8 1 3.3 7.3 0.4 39.1 4 5.6
Total number of species (L, FD) 1 0 2 0 6 5 1 4 2 9 12 5 12 1 10
Paint Rock River mainstem (RM)
Species 53.3 52.3 50.7 50.3 48.4 48.2 46.7 44.4 43.6 42.0 38.5 36.5 34.3 33.7 33.3
Actinonaias ligamentina 2
Amblema plicata 5 10 29 6 2 50 L 12 74 34 3 5 85 18 125
Cyclonaias tuberculata 2 1 1 WD 5 2 1 2 2 2 22
Ellipsaria lineolata
Elliptio crassidens R FD WD 2 1 1
Elliptio dilatata
Epioblasma triquetra* FD 1 1 3 4 3
Fusconaia cor* FD FD WD 5 WD WD 1
Fusconaia ebena 1
Fusconaia subrotunda WD FD 1 WD 1 7 WD 1 3 1 11
Lampsilis abrupta* FD
Lampsilis fasciola 2 1 2 1 FD 1 L 2 9 2 FD 2 2 WD 2
Lampsilis ovata 4 1 7 11 2 10 L 14 8 7 13 9 7 13
Lampsilis teres 1
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Paint Rock River mainstem (RM)
Species 53.3 52.3 50.7 50.3 48.4 48.2 46.7 44.4 43.6 42.0 38.5 36.5 34.3 33.7 33.3
Lampsilis virescens* FD WD 1 2
Lasmigona costata 2 2 7 1 10 FD 11 10 1 1 5 2 13
Leptodea fragilis 2 FD 1 4 3 FD 2
Medionidus conradicus
Megalonaias nervosa 1 1 3 4
Obliquaria reflexa 2 1 2 FD 2
Obovaria subrotunda FD FD FD
Pleurobema cordatum WD R
Pleurobema oviforme R FD WD 1 19 1 28
Pleurobema rubrum
Pleuronaia barnesiana 2 2 2 1 1 L FD 2 2
Pleuronaia dolabelloides WD 3 1 R FD WD 4 WD 4 15 4 14
Potamilus alatus 1 R 2 2 4 3 R FD 15 13 2 15 19 15 32
Ptychobranchus fasciolaris 2 2 2 1 WD FD L FD 6 FD FD 1 WD FD
Pyganodon grandis 1
Quadrula c.cylindrica* 3 R 13 1 12 7 8 11 4 14 3 119
Quadrula pustulosa R 1
Quadrula verrucosa 1 R 20 2 4 100 L 5 2 12
Toxolasma cylindrellus*
Toxolasma lividum FD 1 FD FD 1 FD 1 6
Truncilla donaciformis FD 2
Truncilla truncata FD 1 FD 1
Villosa iris 2 2 2 1 FD FD FD 4 WD FD
Villosa taeniata WD FD 2
Villosa vanuxemensis WD FD FD 1 2 FD FD FD 3 WD FD FD 1 WD
Search time (ph) 1.5 1.3 2.7 2.25 1.5 2.25 0.75 3.0 4.0 1.25 0.6 1.0 3.0 1.0 3.0
Total number of mussels 24 22 87 37 17 196 N/A 17 178 78 27 52 193 61 410
CPUE (mussels/hour) 16 16.9 32.2 16.4 11.3 87.1 N/A 5.7 44.5 62.4 45 52 64.3 61 137
Total number of species (L, FD) 12 10 16 12 12 22 11 13 19 9 12 12 22 16 21
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Paint Rock River mainstem (RM) Estill Fork (RM)
Species 30.0 29.2 27.6 25.2 21.2 20.6 19.0 18.2 16.7 15.5 13.1 5.6 3.6 2.8 2.2 1.0 Totals
Actinonaias ligamentina R 2
Amblema plicata 2 1 1 2 6 1 1 R FD R R 2 R 548
Cyclonaias tuberculata 5 1 8 2 43 10 1 WD L 110
Ellipsaria lineolata 1 R 1
Elliptio crassidens FD FD 2 4 R FD 11
Elliptio dilatata R R R 1 R 1
Epioblasma triquetra* FD FD FD 2 7 FD FD FD FD 21
Fusconaia cor* WD 6
Fusconaia ebena 1
Fusconaia subrotunda WD WD 1 5 6 FD 1 FD FD 47
Lampsilis abrupta* R FD
Lampsilis fasciola 1 FD FD 1 FD FD 6 FD FD 1 FD 38
Lampsilis ovata 4 FD 7 1 5 2 3 L 144
Lampsilis teres R FD FD R 1 2 FD 4
Lampsilis virescens* 1 4
Lasmigona costata FD R R FD FD 69
Leptodea fragilis 2 2 FD FD FD FD 16
Medionidus conradicus 1 1
Megalonaias nervosa 3 2 1 1 WD FD 16
Obliquaria reflexa WD FD FD 1 FD 8
Obovaria subrotunda WD WD FD FD
Pleurobema cordatum 1 R R R FD 1
Pleurobema oviforme WD FD 1 9 4 FD 1 L 65
Pleurobema rubrum WD R 1 1
Pleuronaia barnesiana WD 3 FD FD 5 2 1 WD 31
Pleuronaia dolabelloides R 3 15 FD FD FD L 66
Potamilus alatus 3 1 2 1 FD L 132
Ptychobranchus fasciolaris FD FD FD R 21
Pyganodon grandis 1
Quadrula c.cylindrica* 3 2 4 6 FD L 218
Quadrula pustulosa WD WD FD WD 1 FD FD L 2
Quadrula verrucosa R FD R 149
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Paint Rock River mainstem (RM) Estill Fork (RM)
Species 30.0 29.2 27.6 25.2 21.2 20.6 19.0 18.2 16.7 15.5 13.1 5.6 3.6 2.8 2.2 1.0 Totals
Toxolasma cylindrellus* 1 WD R 1
Toxolasma lividum FD FD FD 2 WD 2 FD 2 1 L WD 1 19
Truncilla donaciformis 2
Truncilla truncata 1 3
Villosa iris FD FD 1 FD FD 1 FD FD FD FD WD 4 4 WD 24
Villosa taeniata 1 18
Villosa vanuxemensis 1 2 FD FD FD FD WD FD 4 FD WD 19
Search time (ph) 1.25 1.0 0.75 1.0 3.0 3.0 5.3 1.0 1.25 1.5 1.0 1.5 1 0.75 1.0 1.25
Total number of mussels 22 2 2 5 38 21 108 22 6 6 N/A 12 5 2 7 1 1825
CPUE (mussels/hour) 17.6 2 2.7 5 12.7 7 20.3 22 4.8 4 N/A 8 5 2.7 7 0.8
Total # of species (L, FD) 10 7 5 5 22 16 22 17 13 9 23 5 2 1 4 1
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Appendix 2. Historical species documentation and PRR mussel-survey comparisons. W = Williams
et al. (2008) , O = Ortmann (1925, At = Athearn (1957–1969) collections from North Carolina State
Museum of Natural Sciences (Johnson et al. 2008), I & Y = Isom and Yokley (1973), Ah 86 = Ahlstedt
(1986), Ah 95 = Ahlstedt (1995), G = Godwin (2002), and PS = present survey (2008). *Not found
during this survey but collected by P. Freeman (TNC) during survey period. **Not found during this
survey but subsequently collected by the authors and P. Freeman.
Species W O At I & Y Ah 86 Ah 95 G PS
Actinonaias ligamentina X 2
Actinonaias pectorosa X
Alasmidonta marginata X X
Alasmidonta viridis X X 2 1
Amblema plicata X X X X 27 182 79 548
Cyclonaias tuberculata X X X 99 110
Ellipsaria lineolata X X X 4 1
Elliptio crassidens X X X X 10 11
Elliptio dilatata X X X X 1 1
Epioblasma biemarginata X X
Epioblasma capsaeformis X X X X 1
Epioblasma florentina X
Epioblasma lenior X X
Epioblasma triquetra X X X 12 21
Fusconaia cor X X X X 16 30 4 6
Fusconaia cuneolus X X X X 1 2
Fusconaia ebena X X 1
Fusconaia subrotunda X X 10 47
Lampsilis abrupta X FD*
Lampsilis fasciola X X X X 8 26 1 38
Lampsilis ovata X X X X 24 60 12 144
Lampsilis teres X X 4 4
Lampsilis virescens X X X X 8 1 4
Lasmigona complanata X X**
Lasmigona costata X X X X 12 37 7 69
Lasmigona holstonia X 1 50
Leptodea fragilis X X X X 8 16
Ligumia recta X X X 1
Medionidus conradicus X X X 6 2 3 1
Megalonaias nervosa X X 1 47 16
Obliquaria reflexa X X X 2 37 8
Obovaria subrotunda X X X X 7 9 FD
Pleurobema cordatum X X X 8 1
Pleurobema oviforme X X X X 2 1 65
Pleurobema plenum X X
Pleurobema rubrum X 1
Pleurobema sintoxia X
Pleuronaia barnesiana X X X X 8 1 48 31
Pleuronaia dolabelloides X X X X 14 309 4 50
Potamilus alatus X X X X 20 103 6 132
Potamilus ohiensis X
Ptychobranchus fasciolaris X X X X 12 29 1 21
Pyganodon grandis X X X 1 1
Quadrula c.cylindrica X X X X 2 40 1 218
Quadrula metanevra X X 4
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Species W O At I & Y Ah 86 Ah 95 G PS
Quadrula pustulosa X X X X 1 14 2
Quadrula quadrula X
Quadrula verrucosa X X X X 8 8 149
Toxolasma cylindrellus X X 3 1 5 1
Toxolasma lividum X X X X 3 82 2 19
Toxolasma parvum X
Truncilla donaciformis X X X X 2
Truncilla truncate X X X X 3 3
Utterbackia imbecillis X X FD*
Villosa iris X X X X 14 109 80 24
Villosa taeniata X X X X 24 10 18
Villosa trabalis X X
Villosa vanuxemensis X X X X 4 81 17 19
Total species 57 39 39 30 25 37 19 41