GEOGRAPHIC VARIATION IN REPRODUCTION IN A FRESHWATER TURTLE (CLEMMYS GUTTATA)

Herpetologica ◽  
2006 ◽  
Vol 62 (2) ◽  
pp. 132-140 ◽  
Author(s):  
Jacqueline D. Litzgus ◽  
Timothy A. Mousseau
Keyword(s):  
Geographic Variation ◽  
Freshwater Turtle ◽  
Clemmys Guttata

scholarly journals A Comparison of the Population Genetic Structure and Diversity between a Common (Chrysemys p. picta) and an Endangered (Clemmys guttata) Freshwater Turtle

Diversity ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 99 ◽  
Author(s):  
Scott W. Buchanan ◽  
Jason J. Kolbe ◽  
Johanna E. Wegener ◽  
Jessica R. Atutubo ◽  
Nancy E. Karraker
Keyword(s):  
Genetic Structure ◽  
Rhode Island ◽  
Population Genetic Structure ◽  
Landscape Change ◽  
Population Genetic ◽  
Freshwater Turtle ◽  
Freshwater Turtles ◽  
Painted Turtles ◽  
Clemmys Guttata ◽  
Genetic Structure And Diversity

The northeastern United States has experienced dramatic alteration to its landscape since the time of European settlement. This alteration has had major impacts on the distribution and abundance of wildlife populations, but the legacy of this landscape change remains largely unexplored for most species of freshwater turtles. We used microsatellite markers to characterize and compare the population genetic structure and diversity between an abundant generalist, the eastern painted turtle (Chrysemys p. picta), and the rare, more specialized, spotted turtle (Clemmys guttata) in Rhode Island, USA. We predicted that because spotted turtles have disproportionately experienced the detrimental effects of habitat loss and fragmentation associated with landscape change, that these effects would manifest in the form of higher inbreeding, less diversity, and greater population genetic structure compared to eastern painted turtles. As expected, eastern painted turtles exhibited little population genetic structure, showed no evidence of inbreeding, and little differentiation among sampling sites. For spotted turtles, however, results were consistent with certain predictions and inconsistent with others. We found evidence of modest inbreeding, as well as tentative evidence of recent population declines. However, genetic diversity and differentiation among sites were comparable between species. As our results do not suggest any major signals of genetic degradation in spotted turtles, the southern region of Rhode Island may serve as a regional conservation reserve network, where the maintenance of population viability and connectivity should be prioritized.

Stochastic and spatially explicit population viability analyses for an endangered freshwater turtle, Clemmys guttata

2009 ◽  
Vol 87 (12) ◽  
pp. 1241-1254 ◽  
Author(s):  
J. J. Enneson ◽  
J. D. Litzgus
Keyword(s):  
Quantitative Methods ◽  
Population Viability Analysis ◽  
Population Viability ◽  
Habitat Destruction ◽  
Population Persistence ◽  
Freshwater Turtle ◽  
Turtle Species ◽  
Georgian Bay ◽  
Clemmys Guttata ◽  
Risk Of Extinction

Over two thirds of the world’s turtle species are in decline as a result of habitat destruction and harvesting. Quantitative methods for predicting the risk of extinction of turtle populations are essential for status assessments and recovery planning. Spotted turtles ( Clemmys guttata (Schneider, 1792)) are considered vulnerable internationally, and endangered in Canada. We used population viability analysis to assess the risk of extirpation of a Georgian Bay, Ontario, population that has been under study since 1977 and of nine Ontario populations for which population size is known, and to examine the effects of dispersal between breeding ponds on population persistence. A simple stochastic model for the Georgian Bay population projected a 60% probability of extirpation in 100 years. A metapopulation model for the same study area projected an 18% probability of extirpation within 100 years, suggesting that dispersal between breeding ponds is important for population persistence. Spotted turtles at this relatively pristine site have a relatively high risk of extinction despite the absence of anthropogenic additive mortality. Probability of quasi-extinction as a result of stochasticity for the model simulating nine Ontario populations was low, but the probability of six or more of the nine known Ontario populations becoming extirpated within 100 years was 26%, indicating that recovery action is necessary to prevent decline of spotted turtles within the species’ Canadian range, which is restricted to Ontario.

To Whistle or Not to Whistle? Geographic Variation in the Whistling Behavior of Small Odontocetes

2008 ◽  
Vol 34 (3) ◽  
pp. 288-302 ◽  
Author(s):  
Julie N. Oswald ◽  
Shannon Rankin ◽  
Jay Barlow
Keyword(s):  
Geographic Variation
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