Current Research


 

Snake populations in the northeast are often dependent on rocky outcrops that provide natural basking and denning habitat.

 

My current research focuses on identifying key factors that can affect variation in the overall genetic structure of recently diverged populations, and the relative roles organismal attributes and microevolution play in shaping that structure. Traditional biogeography focuses mainly on species diversity patterns at broad temporal and spatial scales. For many species, distribution and habitat data are available at much finer scales than those typical of phylogenetics. By integrating fine-scale molecular analyses with information on ecological attributes of species, we can gain a much deeper understanding of relative roles of behavior and microevolution in the divergence of populations. This work is being carried out in collaboration with Harry Greene, Kelly Zamudio, Steve DeGloria, and Bill Brown.

 

For this project, we are focusing on a model top-level predator in the eastern deciduous forests of the United States—the timber rattlesnake (Crotalus horridus). Because they are top carnivores feeding on a variety of woodland mammalian species, timber rattlesnakes are likely to be important in the maintenance of community dynamics. Rattlesnakes share many attributes with other large predators that act as keystone species: they are long-lived, slow-reproducing, wide-ranging, require specialized habitat, and have been actively eradicated from much of their former range.  

Dark-morph timber rattlesnake from northern Pennsylvania in typical rock-outcrop basking habitat.

However, rattlesnakes offer two key advantages that make them more ideally suited for this research than other species might be: (1) tissue samples that form the core of the analysis can be collected relatively easily in very large numbers from natural aggregations formed at overwintering sites and shed skins reliably left at given habitat features, (2) many rattlesnake molecular markers have already been published, thereby eliminating the costly and time-consuming process of developing new markers.

 

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