Conservation Biology of Freshwater Turtles and Tortoises:
Emydidae
— Graptemys
gibbonsi Turtle Specialist Group
A Compilation Project of
the IUCN/SSC
Tortoise and Freshwater
A.G.J. Rhodin, P.C.H. Pritchard, P.P. van Dijk, R.A. Saumure, K.A. Buhlmann, J.B. Iverson, and R.A. Mittermeier, Eds.
Chelonian Research Monographs (ISSN 1088-7105) No. 5, doi:10.3854/crm.5.029.gibbonsi.v1.2009
© 2009 by Chelonian Research Foundation • Published 26 October 2009
029.1
Graptemys gibbonsi Lovich and McCoy 1992 –
Pascagoula Map Turtle, Pearl River Map Turtle, Gibbons’ Map Turtle
Jeffrey e. Lovich1, WiLL SeLman2, and c.J. mccoy3
1
U.S. Geological Survey, Southwest Biological Science Center,
2255 North Gemini Drive, MS-9394, Flagstaff, Arizona 86001 USA [jeffrey_lovich@usgs.gov];
2
The University of Southern Mississippi, Hattiesburg, Mississippi 39402 USA [will.selman@usm.edu];
3
Deceased
Summary. – The Pascagoula map turtle, Graptemys gibbonsi (Family Emydidae), is a large
aquatic species endemic to the Pascagoula and Pearl River drainages of Mississippi and southeastern
Louisiana. It was previously considered part of the composite species G. pulchra. Sexual dimorphism
is pronounced, with adult females (carapace length to 295 mm) attaining more than twice the size
of adult males (to 141 mm). Although the species is locally abundant, populations are threatened
by habitat destruction, commercial collecting, and target practice by unethical people who shoot
basking turtles. The current IUCN Red List status is Lower Risk/Near Threatened, but the status
should be re-examined due to recent surveys indicating population declines or the disappearance
of the species from previously documented localities. In addition, genetic and pattern differences
between populations in the Pearl and Pascagoula rivers suggest that the two entities should be
managed separately to protect signiicant biodiversity.
DiStribution. – USA. Restricted to the Pascagoula and Pearl River systems of Mississippi and
Louisiana, as well as the lower Escatawpa River of southeastern Mississippi.
Synonymy. – Graptemys gibbonsi Lovich and McCoy 1992, Graptemys pulchra gibbonsi.
SubSpecieS. – None recognized.
StatuS. — IUCN 2008 Red List Status: Lower Risk / Near Threatened (LR/NT) (assessed 1996,
needs updating); CITES: Appendix III (all Graptemys spp.; USA); US ESA: Not Listed.
Taxonomy. — The Pascagoula map turtle, Graptemys
gibbonsi, was described by Lovich and McCoy (1992),
who demonstrated that the species Graptemys pulchra Baur
1893 was a composite of three distinct, allopatric species.
The other species in the complex include the Alabama map
turtle (G. pulchra, sensu stricto) in rivers and tributaries
of the Mobile Bay drainage, and the Escambia map turtle
(G. ernsti) of the Escambia Bay drainage of southeastern
Alabama and western Florida. The three species are welldifferentiated on the basis of morphology and pattern, and
Figure 1. Adult male Graptemys gibbonsi from the Chickasawhay River, near Leakesville, Mississippi, USA. Photo by Jeffrey Lovich.
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Conservation Biology of Freshwater Turtles and Tortoises • Chelonian Research Monographs, No. 5
Figure 3. Graptemys gibbonsi exhibits dramatic sexual dimorphism between adult males (foreground) and females (background). Individuals from the Leaf River, Mississippi, USA.
Photo by Will Selman.
Figure 2. Head pattern of a female Graptemys gibbonsi from the
Leaf River, Mississippi, USA. Photos by Will Selman.
exhibit divergent mtDNA genotypes (Lovich and McCoy
1992; Lamb et al. 1994). These three species, together with
G. barbouri, form the Graptemys pulchra species group of
the genus (Lovich and McCoy 1992) and all are characterized by extreme sexual size dimorphism and megacephalic
adult females (Lindeman 2000). Additional information on
G. gibbonsi (as G. pulchra, partim) was summarized by
Lovich (1985).
Recently, Pearl and Pascagoula River populations of
G. gibbonsi were shown to exhibit a high degree of genetic
differentiation (Ennen et al. 2007a). The molecular divergence was greater than that exhibited between two other
Graptemys taxa from the same rivers with longstanding
recognition as valid species. In this case, the yellow-blotched
sawback (G. lavimaculata) from the Pascagoula River and
the ringed sawback (G. oculifera) from the Pearl River are
more similar to each other than the two populations of G.
gibbonsi are to each other (Ennen et al. 2007a). The observed
degree of differentiation requires recognition of populations
in the Pearl and Pascagoula rivers as separate evolutionary
entities to protect signiicant biodiversity. The authors are
currently collaborating with others to further examine the
level of differentiation exhibited between populations in the
two rivers.
Description. — The Pascagoula map turtle is a large
turtle that exhibits dramatic sexual dimorphism (females to
295 mm carapace length [CL], 3150 g; males to 141 mm
CL, 340 g). The shell is high-domed, possesses a median
keel, and has a single, wide, vertical, yellow bar on the
dorsal surface of each marginal scute (Fig. 1). The median
carapace keel is composed of salient spines on the posterior
Figure 4. Hatchling Graptemys gibbonsi from Mississippi, USA. Left: from the Pearl River. Photo by Bill Love. Right: from the
Leaf River. Photo by Will Selman.
Emydidae — Graptemys gibbonsi
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Figure 5. Distribution of Graptemys gibbonsi in the southeastern USA (Louisiana and Mississippi). Red points = museum and literature
occurrence records based on Iverson (1992) plus more recent and authors’ data; green shading = projected distribution based on GISdeined hydrologic unit compartments (HUCs) constructed around veriied localities and then adding HUCs that connect known point
localities in the same watershed or physiographic region, and similar habitats and elevations as veriied HUCs (Buhlmann et al., in press),
and adjusted based on authors’ data.
portions of the second and third vertebrals, these features
are more prominent in males and juveniles. A complete or
broken black stripe, most pronounced anteriorly, marks the
median keel of the vertebrals, and pleural scutes 1–3 have
circular yellow markings on the distal parts. The plastron
is pale yellow with dark pigment on some seams. Ground
color of head and limbs is brown to olive with light yellow
or yellowish-green stripes and blotches. The head pattern
consists of a large interorbital blotch that is connected to the
large postorbital blotches (Fig. 2). Supraoccipital spots are
absent. The dorsal paramedian neck stripes are not expanded
anteriorly, but may contact the postorbital blotches. A threepronged yellow blotch (nasal trident) is usually present on
the dorsal head surface behind the nares and occurs more
frequently in turtles from the Pearl River (Lovich and McCoy 1992).
In addition to being over twice the size of adult males,
females (Fig. 3) have conspicuously enlarged heads with
broad jaw surfaces. Males have longer tails with the vent
posterior to the rim of the carapace, but do not have pronounced long foreclaws in comparison to other narrowheaded Graptemys species. Both sexes have relatively lat
plastrons.
The color of G. gibbonsi hatchlings resembles the coloration of adults, but is much more vivid with greater contrast,
particularly the net-like pattern on the pleural scutes (Fig.
4). Hatchlings are as wide as they are long (39 mm CL, 40
mm carapace width, 36 mm plastron length, 10 grams; W.
Selman, unpubl. data) and have a serrate carapace edge at
all marginal scutes, as well as a well-pronounced vertebral
keel that is not as laterally compressed as adult males. The
plastral markings of hatchlings often cover more area than
the adult markings.
Allopatric species in the G. pulchra species group differ
as follows: G. pulchra has the interorbital and postorbital
blotches connected, concentric yellow circles on the dorsal
sides of marginal scutes, and lacks supraoccipital spots and
a nasal trident; in G. ernsti the interorbital and postorbital
blotches are not connected, a nasal trident and supraoccipital spots are usually present; G. barbouri has a narrow
interorbital blotch that ends in a point on the rostrum, a
heart-shaped marking between the orbits, and a transverse
bar on the lower jaw. Pascagoula River G. gibbonsi appear to have brighter coloration in comparison to those
from the Pearl River. The former have wider yellow bars
on the upper marginal scutes and narrower black bars on
the lower marginal scutes, relative to those from the Pearl
River (Lovich and McCoy 1992).
Distribution. —The Pascagoula map turtle is found in
large rivers to small creeks within the Pascagoula and Pearl
River systems of Mississippi and eastern Louisiana (Fig. 5).
Previously published Pascagoula River system localities are
in the Pascagoula, Leaf, and Chickasawhay rivers, Red, Bouie
(aka Bowie), Okatoma creeks (Cliburn, 1971), Chunky River,
and Tallahala Creek (Lindeman, 1998). Mount (1975) noted
that G. pulchra (= G. gibbonsi) did not occur in either Big
Creek or the Escatawpa River, which are Alabama tributaries
of the Pascagoula River. However, recent surveys by Selman
and Qualls (2009) found G. gibbonsi present in the Lower
Escatawpa in Mississippi, but no individuals in the Upper
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Escatawpa River of Mississippi that nears Alabama. The
southernmost distribution within the Pascagoula River is
near Vancleave, Mississippi, in the Lower Pascagoula River
(Selman and Qualls 2009). These surveys also documented
G. gibbonsi within a multitude of smaller creeks within the
Pascagoula River system that were unsearched by previous
surveys including: Bogue Homa, Bucatunna, Long, Gaines,
Oakohay, Okatibbee, Souinlovey, and Tallahoma creeks.
Pearl River drainage populations occur in Ross Barnett
Reservoir (Boyd and Vickers 1963; Lindeman 1998), the
main stem Pearl River, Bogue Chitto River (Lovich and McCoy 1992), as well as the Yockanookany and Strong rivers
(Lindeman 1998). Dundee and Rossman (1989) published
a record of this species (as G. pulchra) from the Tickfaw
River at U.S. Highway 190, Livingston Parish, Louisiana.
Lovich and McCoy (1992) questioned that record, as the
species is unknown in the Tangipahoa, Tchefuncte, and
Amite rivers, which are located between the Tickfaw River
and Bogue Chitto River (Cagle 1952; Cliburn 1971), the
latter a known locality for the species. The southernmost
distribution within the Pearl River is near the former town
of Napolean, Mississippi, within the East Pearl River (W.
Selman, pers. obs.).
Habitat and Ecology. — Graptemys gibbonsi is most
abundant in large to medium sized rivers, where basking
sites (logs and snags: Lindeman 1999), nesting sites (sandy
beaches), and food species (especially clams and snails)
are abundant. The species prefers clean water. Ernst and
Lovich (2009) observed that G. gibbonsi was conspicuously
absent below a paper mill outlow on the Leaf River in 1986,
although the species was abundant in the river upstream
from the pollution source. During recent surveys (2006 and
2008), this same locality had the highest abundance of G.
gibbonsi within the Pascagoula River system (Selman and
Qualls 2009), suggesting that pollution in that river stretch
may have decreased in the intervening years. Saltwater is
apparently avoided, and populations do not occur within a
mile of estuaries (McCoy and Vogt, unpubl. data).
The introduced Asian mussel (Corbicula sp.) is an
important food source for the species, especially for adult
females which have broad crushing jaw surfaces (Ennen et
al. 2007b; Lindeman and Sharkey 2001). Adult females also
eat native clams, snails, and crustaceans. McCoy and Vogt
(unpubl. data) found that G. gibbonsi (both sexes, all sizes
combined) in the Chickasawhay River ate 82% (by volume)
mollusks, and 5.7% each insects and vegetation. At a site
on the Pearl River the diet was broader, with approximately
25% each insects and mollusks and 44% ish in stomach
contents sampled. Males and small females (especially those
less than 100 mm CL) are highly insectivorous.
Graptemys gibbonsi is primarily diurnal; basking, which
is the most conspicuous surface activity, occurs at all times
of the day. Basking times appear similar to the sympatric
yellow-blotched sawback (G. lavimaculata) with midday
and late afternoon basking peaks (Selman, unpubl. data).
Inter- and intraspeciic basking competition has been also
been observed with this species (Selman and Qualls 2008;
Selman, pers. obs.). Additionally, voluntary parasite release
while basking has been observed on a female G. gibbonsi
(Selman et al. 2008): observations noted that the carapace
temperature of the basking turtle became hot enough to
induce a leech to detach.
Gravid females were found from 3 May to August
in 1978 and 1979 on the Pearl and Chickasawhay rivers
(McCoy and Vogt, unpubl. data). Average clutch size was
7.5 in the Chickasawhay population, and 6.4 in the Pearl
population. Individual females probably produce several
clutches each year, based on the dates when gravid females
were captured. Average egg measurements are 26 x 38
mm, average egg mass is between 13.9 and 15.5 g, and
average relative clutch mass (clutch mass/body mass) is
between 0.04 and 0.06 (McCoy and Vogt, unpubl. data).
Nest sites are located on sandbars near the water’s edge.
Later studies from 2005–08 (Selman, unpubl. data) in the
Leaf River population found gravid females from 3 April
to 3 June. The mean size of gravid females was 22.4 cm (n
= 8) and the smallest gravid female was 17.9 cm. Females
presumably do not reach maturity for 15–20 years, while
males probably reach maturity sooner. On 12 May 2007,
a female G. gibbonsi (ca. 22 cm CL) was interrupted nesting at 0845 hrs on a dirt road above a sandbar (Leaf River,
Forrest Co., Mississippi; Selman and D. Strong, pers. obs.).
The prospective nest location was 55 m from the nearest
point of the river and 4.5–6.0 m above the water line. The
nest location was mostly shaded under oak trees (Quercus
nigra) and was silty to sandy with little vegetation within
0.5 m of the nest. Also, on multiple occasions, nesting females have been seen on sandy cut bank sections and thus,
this species likely uses other nesting habitat than sandbars
(Selman, pers. obs.).
Additional information on the ecology of G. gibbonsi
is summarized by Ernst et al. (1994) and Ernst and Lovich
(2009).
Population Status. — Historically, this species appeared to be abundant and easy to capture. Chaney and Smith
(1950) caught 64 G. gibbonsi and G. oculifera (combined),
in addition to 9 Trachemys scripta, 4 Pseudemys concinna,
and 4 Sternotherus carinatus in 26 hrs of collecting along
9 km of the Pearl River. Cagle (1952) collected 98 G.
gibbonsi (as G. pulchra) in the Pearl River, including 75
juveniles, 12 adult males, and 11 females (ive of the latter
were adults). Cagle (1953) also collected 105 G. gibbonsi
in comparison to 51 G. oculifera in the Pearl River. Other
early surveys by Tinkle (1958) found G. gibbonsi (as G.
pulchra) to be the second most abundant turtle collected
(15 individuals) within the Pascagoula River (behind G.
lavimaculata, 21) and the most abundant turtle within the
Pearl River (57 individuals to 30 G. oculifera), similar to
what Cagle found.
Later surveys by McCoy and Vogt (unpubl. data)
found that G. gibbonsi was the fourth most abundant turtle
species at a Pearl River site, after (in order of decreasing
abundance) S. carinatus, T. scripta, and P. concinna, but
more abundant than G. oculifera, Apalone spinifera, A.
Emydidae — Graptemys gibbonsi
mutica, Macrochelys temminckii, Sternotherus odoratus,
and Chelydra serpentina. In the Chickasawhay River at
Leakesville, Mississippi (type-locality for the species)
G. gibbonsi was the most abundant aquatic turtle species,
followed by A. mutica, S. carinatus, A. spinifera, G. lavimaculata, T. scripta, P. concinna, M. temminckii, and S.
odoratus.
During the 1990s, Lindeman (1998, 1999) conducted
spotting scope surveys throughout the Pearl and Pascagoula
River systems. Graptemys gibbonsi were found to occur
at much lower densities throughout the Pearl and Pascagoula River systems in comparison to G. oculifera and G.
lavimaculata, both of which are federally listed species.
Combined, G. oculifera and G. lavimaculata sometimes
outnumbered G. gibbonsi dramatically, particularly within
the Upper and Lower Pearl River (1 G. gibbonsi: 28.6 G.
oculifera), West Pearl River (1: 4.1), and Pascagoula River (1
G. gibbonsi: 7.2 G. lavimaculata). Of all the sites surveyed,
G. gibbonsi never outnumbered G. oculifera within the
Pearl River system and only outnumbered G. lavimaculata
within the Chickasawhay River (1.5:1), Chunky River (no
G. lavimaculata seen), and Black Creek (2:1), all of which
are within the Pascagoula River system. Graptemys gibbonsi
densities were also positively correlated with emergent
deadwood abundance (Lindeman 1999). Lower G. gibbonsi
levels in these drainages in comparison to prior surveys by
Cagle and others were attributed to declining water quality
and the negative impacts it has on mollusk populations, the
primary food item of G. gibbonsi.
Two additional surveys for G. oculifera were conducted
during the 1990s in Louisiana with pertinent information
on G. gibbonsi populations. At seven sites within the West
Pearl River Navigation Project, Dickerson and Reine
(1996) documented much lower densities of G. gibbonsi
in comparison to G. oculifera (16 G. gibbonsi: 534 G.
oculifera). Two additional sites of the middle Pearl River
of Mississippi were also surveyed by Dickerson and Reine
(1996) and both were also found to have lower densities
of G. gibbonsi in comparison to G. oculifera (125 G. gibbonsi: 2501 G. oculifera). Later, spotting scope surveys
of the Bogue Chitto River (Shively 1999) noted fewer G.
gibbonsi (370 or 22% of basking turtles) in comparison to
G. oculifera (513 or 30%). Graptemys gibbonsi occurred
more frequently than G. oculifera in only 51 of the 133
river bends examined.
Later, bridge and boat/canoe surveys of the Pascagoula drainage (Selman and Qualls 2009) indicated that
G. gibbonsi appeared to be locally abundant in the upper
reaches of the Pascagoula River and sections of the Leaf
and Chickasawhay rivers. Overall, G. gibbonsi was the
third most abundant basking species within the Pascagoula
River system and was the dominant basking Graptemys
only in the Chickasawhay River (similar to McCoy and
Vogt’s indings), with G. lavimaculata being the most
abundant basking Graptemys within the Pascagoula and
Leaf rivers. However, the Chickasawhay River had fewer
total basking turtles observed per bridge in comparison
029.5
to the Pascagoula or Leaf rivers. Graptemys gibbonsi
occurred within several of the smaller creeks/tributaries,
but P. concinna was often the dominant basking species
observed in these habitats.
No G. gibbonsi were spotted via bridge surveys in the previously documented localities of Okatoma or Bouie Creeks.
A boat survey of the lower reaches of the Bouie River noted
one individual, but this stretch of river has been severely
impacted due to gravel mining (Selman and Qualls 2009).
Also, extremely small populations of G. gibbonsi occur in
the lower reaches of the Pascagoula and Escatawpa rivers
and no individuals were spotted within Bluff Creek which
has no previously documented records for G. gibbonsi.
The only population estimate for G. gibbonsi comes
from the Leaf River site (Forrest Co., Mississippi) with
an estimated 34.4 per river kilometer (rkm) (95% conidence interval = 27.2–47.7; Selman and Qualls 2009).
For comparison, population estimates for the federally
threatened species, G. lavimaculata, were made from
2005 to 2007 at the same locality and estimates ranged
from 80.1 per rkm to 120.1 per rkm. Therefore, for these
surveys G. gibbonsi was outnumbered by G. lavimaculata at the Leaf River site by 1:2.3 to 1:3.5. Similarly,
Lindeman (1998) observed basking G. oculifera and G.
lavimaculata densities on the Pearl and Pascagoula rivers
to be up to 5.1 times higher than sympatric G. gibbonsi.
Such was not always the case. Lindeman (1999) analyzed
historical population trends that show G. gibbonsi was
almost twice as abundant as G. oculifera on the Pearl
River in the 1950s and 1960s, but less common than G.
oculifera in the late 1970s. By the late 1980s and early
1990s, the ratio of G. oculifera to G. gibbonsi ranged
from 1.9:1 to 125:1. Similar declines were observed on
the Pascagoula River from the 1950s to the 1990s relative to the abundance G. lavimaculata. Lindeman (1999)
suggested that the reasons for changes in the abundance
of G. gibbonsi relative to narrow-headed Graptemys
congeners was related to the effect of water pollution on
mollusk prey. Habitat degradation by channelization of
rivers and industrial pollution, particularly from the paper
industry, undoubtedly contributed to declines (Buhlmann
and Gibbons 1997).
Trapping results at four sites (three within the Pascagoula and one in the Pearl) also indicate that G. gibbonsi
population levels now are lower than G. lavimaculata or
G. oculifera (Selman and Qualls 2009). Jones and Hartield
(1990) conducted similar trapping at ive sites within the Pearl
River system of Mississippi. Graptemys gibbonsi captures
in 1990 were also lower at all ive sites in the Pearl River in
comparison to G. oculifera. The site shared by both studies
had substantially higher levels of G. gibbonsi in 1990 (132
G. gibbonsi to 152 G. oculifera; 1:1.15) in comparison to
2005–06 (39 G. gibbonsi to 227 G. oculifera; 1:5.82). Additionally, there was no change in G. oculifera levels at this
site during the same time period (Jones and Hartield 1989,
1990; Selman and Qualls 2005, 2006). Thus, G. gibbonsi
populations at this site have declined in the last 17 years,
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possibly due to impacts on mollusk prey items from the input
of pulp-mill efluents from an upstream source at Monticello,
Mississippi.
The Lower Escatawpa G. gibbonsi population appears
to be the most vulnerable due to its disjunct location away
from the main Pascagoula River population, as well as its
extremely small size (Selman and Qualls 2009). Other
populations that appear vulnerable to local extirpations
are those that occur downstream of industrial/municipal
efluents (i.e., Lower Pearl River) which likely negatively
impact molluskan prey items. Lastly, Louisiana populations
that occur within the Lower Pearl and Bogue Chitto rivers
are further threatened due to the recent extensive collection of individuals for the pet trade (Selman and Qualls
2007).
Threats to Survival. — Few G. gibbonsi are found
in streams supporting scant mollusk populations and none
are found in streams in which mollusks are entirely absent.
Thus, any form of stream pollution that has an impact on
mollusk populations would also be potentially detrimental
to populations of G. gibbonsi. Additionally, sedimentation
of rivers and streams has been implicated in the decline of
native freshwater mussels and gastropods in Mississippi
(Jones et al. 2005), thus likely impacting the prey base of
G. gibbonsi. Habitat modiications such as removal of logs
or snags, channelization, or impoundment may eliminate
habitat elements such as basking sites and nesting beaches
that are essential for survival of this species (Lindeman
1999).
The species is exploited for the pet trade as far away as
Hong Kong and other Chinese markets (Cheung and Dudgeon 2006). Individuals of all size classes are offered for
sale at pet expos and online (C. Lechowicz, pers. comm.).
Additionally, rumors within the pet trade that G. gibbonsi is
a species of concern has surely fueled additional collection
for this species. There is very little concrete information on
the exploitation of G. gibbonsi, although it is reported that
hundreds were collected in the Pearl River Basin in 2006
(Selman and Qualls 2007).
Nests of G. gibbonsi are presumably depredated
by many species (including raccoons [Procyon lotor]
and crows [Corvus spp.]) and hatchlings are depredated
by largemouth bass (Micropterus salmoides; Carr and
Messinger 2002) and other likely predators, including
alligators (Alligator mississipiensis), weasels (Mustela
spp.), herons (Ardea spp.), and egrets (Egretta spp.). On
several occasions, dead females have also been found on
sandbars, apparently depredated by mammalian predators
while nesting (Selman, pers. obs.). However, humans are
the only signiicant predators of adults. Local ishermen
incorrectly regard turtles as vermin, or competitors for ish.
Individuals are occasionally caught by ishermen (Ennen
et al. 2007b) and several female G. gibbonsi remains have
been found decapitated in ishing areas, evidently caught
and killed by ishermen (Selman and Qualls 2007). Shooting
basking turtles, a common practice by unethical people in
some areas, may signiicantly reduce populations.
Conservation Measures Taken. —The state of Mississippi regards G. gibbonsi as a non-game species in need
of management (T. Mann, pers. comm.). Commercial harvest is prohibited, and the possession limit is four turtles.
Commercial collecting of native reptiles in Louisiana is
regulated by the Louisiana Department of Wildlife and Fisheries (http://www.wlf.louisiana.gov/ishing/recreational/
regulations/reptilesandamphibians/). Graptemys gibbonsi
is not state-listed as threatened or endangered in either
Mississippi or Louisiana, but Mississippi is considering
designation of G. gibbonsi as an endangered species due
to recent indings (T. Mann, pers. comm.). In Louisiana, G.
gibbonsi is listed as an Animal of Conservation Concern
with a state element ranking of status level S3, deined as
“rare and local throughout the state or found locally (even
abundantly at some of its locations) in a restricted region
of the state, or because of other factors making it vulnerable to extirpation (21 to 100 known extant populations).”
However, some oficials in Louisiana consider this species
“common,” even though all existing surveys within the state
suggest that it is less common than G. oculifera, a federally threatened species. Protective measures implemented
for federally threatened G. oculifera and G. lavimaculata
should beneit G. gibbonsi due to the sympatry of the latter
with the former.
Conservation Measures Proposed. — Conservation of
G. gibbonsi should recognize the existence of two separate
evolutionary entities at the very least (Pearl and Pascagoula
River populations). Selman and Qualls (2007) suggested that
Lower Pearl River populations have declined relative to G.
oculifera in the last 17 years and Lindeman (1999) concluded
that populations of G. gibbonsi declined relative to G. lavimaculata in the Pascagoula River, based on trapping data
from the 1950s and 1960s. Furthermore, they suggested that
G. gibbonsi should be considered for listing as threatened
under the U.S. Endangered Species Act and Endangered
by the IUCN unless their rarity in basking surveys could be
demonstrated to be due to lower basking frequency relative
to sympatric Graptemys, or larger populations were found
upstream from their study sites, both of which are unlikely
within the Pascagoula River system (Selman and Qualls
2009). The current IUCN Red List status for G. gibbonsi is
Lower Risk/Near Threatened, but that status was assessed in
1996, and the species needs to be re-examined due to recent
surveys indicating population declines and the disappearance
of the species from previously documented localities.
Appropriate conservation measures for the Pascagoula
map turtle include protecting and improving the water quality
of rivers and streams occupied by this species, discouraging stream channelization and removal of snags, promoting
streamside management zones and proper forest management practices within riparian zones, prohibiting or further
regulating commercial collecting, and monitoring densities
of existing populations.
All species of Graptemys are now listed under Appendix
III (USA) of CITES (Convention on International Trade in
Endangered Species).
Emydidae — Graptemys gibbonsi
Captive Husbandry. — Most species of Graptemys
can be kept successfully in captivity as long as their needs
are met (Wahlquist 1970; Welch 1993). Captive specimens
of molluscivorous and Graptemys can be successfully maintained on an artiicial mollusk diet composed of a mixture
of bone meal, oyster shell, trout chow, and agar (R.C. Vogt,
pers. comm.). Captives are known to court and reproduce
regularly (A. Redmond, pers. comm.), and may live in captivity for over 15 years (Snider and Bowler 1992).
Current Research. — Current research on the population status and distribution of G. gibbonsi, as well as basking
behavior, is being inalized within the Pascagoula River
system (Selman, unpubl. data). Additionally, genetic and
morphological research is being conducted on the Pearl and
Pascagoula River populations (Ennen, unpubl. data).
Future work on G. gibbonsi should include population
surveys within the Pearl River system and a more intensive
study on the reproductive biology and diet of this species.
Additionally, marked populations (Selman, unpubl. data)
at the Hattiesburg, Leakesville, and Columbia sites should
be assessed occasionally to determine population densities,
demography, growth, long-term movements, and longevity
of G. gibbonsi.
Acknowledgments. — W. Selman would like to thank
all those who assisted with ield work on this species from
2006–08, especially ield assistants Dustin Strong, Thomas
Boczek, and Chris Grifith, who offered their canoeing and
turtle observational skills. Jimmy Dale Odom, Presley’s
Outing, and Escatawpa Hollow Canoe and Camping (Larry
Godfried) were extremely generous to allow us to use their
private boat ramps to access remote portions of the Leaf and
Escatawpa rivers.
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Citation Format for this account:
loViCH, J.E., sElman, W., and mCCoy, C.J. 2009. Graptemys
gibbonsi Lovich and McCoy 1992 – Pascagoula map turtle,
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