Date of Award
1-1-2019
Document Type
Masters Thesis
Degree Name
M.S.
Organizational Unit
Biological Sciences
First Advisor
Robin M. Tinghitella, Ph.D.
Second Advisor
Erica L. Larson, Ph.D.
Third Advisor
Tom Quinn, Ph.D.
Keywords
Divergent selection, Genetic divergence, Natural selection, Phenotypic divergence, Polymorphism, Sexual selection
Abstract
Recent research has led to a much better understanding of the evolutionary processes that mold and structure variation within and among populations. How populations diverge at the genome-wide level and how polymorphism is maintained within a species, however, remains unclear. We address these questions with two freshwater color morphs, red and black, of the threespine stickleback fish (Gasterosteus aculeatus) from the northwest United States, in which a shift from red to black nuptial coloration occurred in several locations following glacial retreat. We measured phenotypic variation in a suite of traits and used next generation sequencing to characterize within-species and among-morph genetic variation between the two morphs. We found substantial phenotypic and genetic divergence between color morphs, and patterns observed in a third, "mixed" morph that are likely due to hybridization between anadromous and freshwater stickleback. This work highlights the central role of natural and sexual selection in the evolution of divergence in nature.
Publication Statement
Copyright is held by the author. User is responsible for all copyright compliance.
Rights Holder
Clara Sophie Jenck
Provenance
Received from ProQuest
File Format
application/pdf
Language
en
File Size
81 p.
Recommended Citation
Jenck, Clara Sophie, "Divergence of Threespine Stickleback That Differ in Nuptial Coloration" (2019). Electronic Theses and Dissertations. 1666.
https://digitalcommons.du.edu/etd/1666
Copyright date
2019
Discipline
Ecology, Evolution & development