Title
Molecular Genetic Affinities of the Melanistic Western Terrestrial Garter Snake, Thamnophis elegans
Date of Award
Spring 2009
Document Type
Thesis
Department
Life & Environmental Sciences
First Advisor
Jennifer Glowienka
Second Advisor
Grant Hokit
Third Advisor
Murphy Fox
Abstract
Polymorphic pigmentation in natural populations has served as a model for understanding diversity and evolutionary change among populations. Melanism is a rare phenotype in garter snake populations that is used to study the adaptation of color and evolutionary processes associated with change in pigmentation among populations. Additionally, melanistic phenotypes can complicate species identification in situations of conservation interest. This study examined the association between phenotype and species of garter snakes found along the Missouri River near Townsend, MT by analyzing Cytochrome b mitochondrial DNA sequences of Thamnophis elegans (Western Terrestrial Garter Snake), T. sirtalis (Common Garter Snake), and melanistic individuals. Morphological evidence from a previous study suggests a close relationship between T. elegans and melanistic individuals. Taxon sampling and DNA extraction were conducted on the two known species and the melanistic individual. Maximum parsimony heuristic and bootstrap analyses and Neighbor-joining analyses were performed. The results showed that the melanistic snake sequences are more similar to sequences of T. elegans than to those of T. sirtalis and the melanistic snakes group with T. elegans in phylogenetic analyses. This study corroborates the findings from the morphological studies and contributes greatly to the understanding of Montana garter snake populations by confirming the species identification of melanistic individuals.
Recommended Citation
Stroebe, Kevyn, "Molecular Genetic Affinities of the Melanistic Western Terrestrial Garter Snake, Thamnophis elegans" (2009). Life and Environmental Sciences Undergraduate Theses. 119.
https://scholars.carroll.edu/lifesci_theses/119
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