Date Thesis Awarded
4-2014
Access Type
Honors Thesis -- Access Restricted On-Campus Only
Degree Name
Bachelors of Science (BS)
Department
Biology
Advisor
M. Drew LaMar
Committee Members
Randolph M. Chambers
Rex K. Kincaid
Abstract
Diamondback terrapins are a species of turtle found along the coast of the United States from Massachusetts to Texas. Many of the states in this range list the terrapins as endangered, threatened, or a species of concern. However, little is known about their actual population sizes or dynamics. To address this, we use a nonlinear, stage-based model to examine the effects of human-related threats such as crab pots and road traffic. We compare our results to those produced by a linear model. When applied to a population of Rhode Island terrapins, our nonlinear model shows that crab potting has a larger negative effect on the population (which causes a population decline occurring at 6.6% mortality of affected stages) than road mortality (with a population decline at 10.6% mortality of affected stages). We also present population data gathered in the Williamsburg, VA area during the summer of 2013. We conclude that additional field work is needed in order to determine the status of many terrapin populations, but that in areas of existing crab potting, conservation efforts should focus on reducing terrapin mortality through the use of bycatch reduction devices.
Recommended Citation
Gilliand, Sarah C., "Population Modeling of Diamondback Terrapins" (2014). Undergraduate Honors Theses. William & Mary. Paper 24.
https://scholarworks.wm.edu/honorstheses/24
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