Date of Award
2022
Document Type
Masters Thesis
Degree Name
M.S.
Organizational Unit
College of Natural Science and Mathematics, Biological Sciences
First Advisor
Erica Larson
Second Advisor
Shannon Murphy
Third Advisor
Jon Velotta
Fourth Advisor
Rebecca Powell
Keywords
Community science, Hybrid zone, Local adaptation, Morphology, Orthoptera, Speciation
Abstract
Patterns of morphological divergence across species’ ranges provide insight into local adaptation and speciation. Here, we compare phenotypic divergence among 4,221 crickets from 337 populations of two related species of field cricket, Gryllus firmus and G. pennsylvanicus and their hybrids. We find that these species differ across their geographic range in key morphological traits, such as body size and ovipositor length, and we directly compare phenotype with genotype for a subset of crickets demonstrating nuclear genetic introgression, phenotypic intermediacy of hybrids, and essentially unidirectional mitochondrial introgression. We discuss how these morphological traits relate to life history differences between the species. Our comparisons across geographic areas support prior research suggesting cryptic variation within G. firmus that may represent different species. Overall, our study highlights how variable morphology can be across wide ranging species, and the importance of studying reproductive barriers in more than one or two transects of a hybrid zone.
Publication Statement
Copyright is held by the author. User is responsible for all copyright compliance.
Rights Holder
Amy Byerly
Provenance
Received from ProQuest
File Format
application/pdf
Language
en
File Size
73 pgs
Recommended Citation
Byerly, Amy, "Morphological Variation and Community Science in Orthoptera" (2022). Electronic Theses and Dissertations. 2042.
https://digitalcommons.du.edu/etd/2042
Copyright date
2022
Discipline
Evolution and development