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Book The Status of Snapping Turtles chelydra Serpentina in Virginia

Download or read book The Status of Snapping Turtles chelydra Serpentina in Virginia written by Benjamin Charles Colteaux and published by . This book was released on 2017 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Snapping turtles (Chelydra serpentina) are being harvested in unprecedented numbers in the United States (US) to meet the needs of international markets. Over three million live snapping turtles from farm and wild caught stock were exported from the US to Asia in 2012-14 alone. In the Commonwealth of Virginia, records indicate that 29,860 snapping turtles were commercially harvested between 2000 and 2015. Size limits are often used to regulate harvest pressure in snapping turtles and other game species. I analyzed the historic harvest of eleven US states to test the efficacy of minimum-size limit regulations at reducing commercial harvest pressure. Further, I conducted a four-year mark-recapture study on three Virginia waterways that have each experienced a different level of historic commercial harvest. As part of the larger mark/recapture project, I conducted radio telemetry on 23 turtles to examine seasonal, body size, and sex-specific effects on home range size of snapping turtles in a lotic system. I incorporated survival and growth rates from this study, demographic rates from the literature, and state-collected harvest rates into a hybrid age/stage population matrix model to estimate the population growth rate at three harvest levels (0%, 21%, 58%) that were estimated based on annual commercial landing reports on file with the Virginia Department of Game and Inland Fisheries. I used the model to test population viability under multiple size limit regulations, and used sensitivity analyses to identify adult stages most critical to the overall population growth rate. Based on model estimates, size-limits were effective at reducing harvest by 30-87% in years with high harvest pressure. However, most size limit regulations result in the removal of larger breeding adults, which has been shown to be detrimental to long term population viability. Based on radio-telemetry data, I found evidence that snapping turtles utilize lotic and lentic habitats differently, which can have implications for management of this iconic species. Matrix population modelling predicted that population densities at the moderate and high harvest site were reduced by 47% and 62%, respectively, when compared to the no harvest site. Model results indicate that, while an increase to the minimum-size limit in 2012 protected a larger portion of the population, that the commercial harvest of snapping turtles in the Commonwealth of Virginia is not sustainable under current state regulations. Our analysis suggests that minimum-size limits of 35.6 cm curved carapace length or greater will maintain viable populations by protecting a larger portion of reproducing snapping turtles within a population.

Book Biology of the Snapping Turtle Chelydra Serpentina

Download or read book Biology of the Snapping Turtle Chelydra Serpentina written by Anthony C. Steyermark and published by . This book was released on 2008-03-31 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume synthesizes all that is known about the common snapping turtle to provide an up-to-date and comprehensive resource on the species' evolution, physiology, behavior, and life history. Anthony C. Steyermark, Michael S. Finkler, Ronald J. Brooks, and a team of experts detail the systematics, energetics, growth patterns, sex determination, and population genetics of snapping turtles and devote special attention to the fossil record of the snapping turtle family Chelydridae.

Book Evaluating the Role of Common Snapping Turtles Chelydra Serpentina in Freshwater Ponds of North Carolina

Download or read book Evaluating the Role of Common Snapping Turtles Chelydra Serpentina in Freshwater Ponds of North Carolina written by Hailey Shoptaugh and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Trophic cascades have frequently been observed in aquatic ecosystems. For example, the common snapping turtle (Chelydra serpentina), can reduce prey populations and trigger long-lasting phytoplankton blooms after short visits. This study aimed to disentangle both direct and indirect effects of common snapping turtles in experimental ponds. Each experimental pond contained food webs differing in predator presence with large and small apex predators (Chelydra serpentina), mesopredator presence (Notophthalmus viridescens), and herbivorous prey (Rana catesbeiana tadpoles). I predicted a direct effect of turtle predation on newts and tadpoles and that snapping turtle predation on newts would cause higher tadpole survival and growth, which indirectly would decrease algal biomass. Tadpoles had the largest masses in food webs with large turtles and newts. Tadpoles with newts and large turtles were further along developmentally than tadpoles in other food webs. Newt survival differed between food webs and appeared to be lowest in food webs with small turtles. There was no statistical difference in algal biomass among food webs at the conclusion of the experiment. Overall, these results highlight that a trophic cascade may occur in freshwater ponds following short term visits by common snapping turtles, but their role is complex and may be size dependent."--Abstract.

Book Population and Status Assessment of the Snapping Turtles Chelydra Serpentina in North Dakota

Download or read book Population and Status Assessment of the Snapping Turtles Chelydra Serpentina in North Dakota written by Christopher D. Dekker and published by . This book was released on 2015 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research was conducted on snapping turtles in North Dakota for two field seasons (2012- 2013) to (1) estimate length weight relationships, age structure, growth and population size in three reservoir systems, (2) determine overwintering locations, and nesting areas; (3) determine and characterize statewide distribution at the county level; and (4) estimate snapping turtle harvest. During two seasons 62 individuals were captured. Eleven radiotagged turtles were found during winter sampling; all were located in close proximity to each other. Most females made a migration upstream from the bay at some point (Figures 25-29). Several management recommendations are made moving forward to help preserve the existing turtle populations, including the need to (1) develop a Management Plan for snapping turtles in North Dakota, (2) Incorporate turtle recording into standard statewide fish surveys, (3) Reduce fisheries netting mortality of snapping turtles, (4) Develop sound, scientifically defensible harvest management regulations and reporting

Book The Reactions of Developing Snapping Turtles Chelydra Serpentina Serpentina Linn to Thiourea

Download or read book The Reactions of Developing Snapping Turtles Chelydra Serpentina Serpentina Linn to Thiourea written by Marie Therese Dimond and published by . This book was released on 1954 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Common Snapping Turtle

Download or read book Common Snapping Turtle written by Jeffrey C. Beane and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Information sheet with physical description, conservation status, habitat, habits and human interactions with the common snapping turtle (Chelydra serpentina).

Book The Cost of Soup

Download or read book The Cost of Soup written by Patrick W. Cain and published by . This book was released on 2010 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Relative Abundance Population Structure and Habitat Utilization of the Alligator Snapping Turtle Macrochelys Temminckii and Eastern Snapping Turtle Chelydra Serpentina in Southeastern Missouri

Download or read book Relative Abundance Population Structure and Habitat Utilization of the Alligator Snapping Turtle Macrochelys Temminckii and Eastern Snapping Turtle Chelydra Serpentina in Southeastern Missouri written by Timothy Charles Lescher and published by . This book was released on 2010 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alligator Snapping Turtles have not been surveyed extensively in Missouri since 1993-94. Six sites that were sampled in the early nineties were re-sampled in 2009 at the same locations where previous researchers trapped. Significantly fewer significantly fewer Alligator Snapping Turtles were captured per trapnight at all six sites. The population structure of the Alligator Snapping Turtles had a significantly different distribution in 2009 compared to 1993-94. The population structure had shifted toward smaller individuals, and fewer adult males and adult females were captured in 2009 compared to 1993-94. The 1993-94 structure was normally distributed while the 2009 structure exhibited a negative skew. Populations sampled in 2009 have an extremely female-biased sex ratio and fewer large adults, which may impact the population negatively in the future. Future sampling of Alligator Snapping Turtles at these six sites is recommended to continue monitoring their long-term trends in relative abundance and population structure. Alligator Snapping Turtles (Macrochelys temminckii) and Eastern Snapping Turtles (Chelydra serpentina) were captured during the summers of 2009 and 2010. Habitat characteristics were collected at each trap that captured these species. Subsequent analysis of data revealed that Alligator Snapping Turtle presence at trap sites was characterized by increased physical structure in the stream, water depth, relatively high levels of detritus, and warmer temperatures when compared to Eastern Snapping Turtles; the amount of aquatic vegetation and bottom surface (i.e., mud or non-mud substrate) were important in characterizing Eastern Snapping Turtle presence in traps. Eastern Snapping Turtles and Alligator Snapping Turtles did not use the same areas spatially, and were only trapped at the same location once in 557 trapnights. Future conservation plans for the Alligator Snapping Turtle and Eastern Snapping Turtle should consider the microhabitat characteristics of sites utilized by these turtles, along with the possibility of interspecific interactions within Chelydridae.

Book The Influence of Water Availability During Incubation on Body Size Body Composition Locomotor Performance and Desiccation Tolerance in Neonatal Snapping Turtles Chelydra Serpentina from North central Nebraska

Download or read book The Influence of Water Availability During Incubation on Body Size Body Composition Locomotor Performance and Desiccation Tolerance in Neonatal Snapping Turtles Chelydra Serpentina from North central Nebraska written by Michael S. Finkler and published by . This book was released on 1998 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Status and Conservation of Turtles of the Northeastern United States

Download or read book Status and Conservation of Turtles of the Northeastern United States written by Thomas F. Tyning and published by . This book was released on 1997 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Status of Marine Turtles in Chesapeake Bay and Virginia Coastal Waters

Download or read book The Status of Marine Turtles in Chesapeake Bay and Virginia Coastal Waters written by Maryellen Lutcavage and published by . This book was released on 1981 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: