Demographic Analysis of the Northern Diamondback Terrapin (Malacelmys Terrapin (Schoepff 1793)) in Connecticut
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Authors
Arnett, John Michael
Issue Date
2024
Item Type
Thesis
Language
Keyword
Alternative Title
Abstract
Malaclemys terrapin terrapin (northern diamondback terrapin) is the only turtle species in North America that primarily occupies brackish habitat. It is recognized as a keystone species because it helps maintain a sustainable estuarine ecosystem. Very little is known about the population size, demographics, and distribution of M. t. terrapin across coastal Connecticut. Using intensive trapping, I explored the status and threats of the Connecticut population of M. t. terrapin. I sampled nine subpopulations of M. t. terrapin representing diverse habitats along the Connecticut coast. Baited hoop nets and opportunistic catches were used for M. t. terrapin mark and recapture sampling between May - August of 2022 and 2023. Location, sex, and morphological data were recorded for 1,809 M. t. terrapins. The population of M. t. terrapin in Connecticut has a greater abundance of females compared to males, and subpopulations of M. t. terrapin consist of varying estimated population size and variable morphological characteristics, including subpopulations with significantly smaller female shell length and body mass. This study explores possible explanations for this variation.