Campus Access Only

All rights reserved. This publication is intended for use solely by faculty, students, and staff of University of the Pacific. No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, now known or later developed, including but not limited to photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author or the publisher.

Date of Award

2014

Document Type

Thesis - Pacific Access Restricted

Degree Name

Master of Science (M.S.)

Department

Biological Sciences

First Advisor

Ryan Hill

First Committee Member

Ajna Rivera

Second Committee Member

Lisa Wrischnik

Abstract

Traditionally, methods for phylogenetic and phylogeographic inference have relied heavily on morphological data. Molecular data can provide an independent assessment of patterns and are particularly desirable when morphology may be under natural selection. Herein we present a phylogeographic analysis of the highly polytypic butterfly, Speyeria callippe. Samples were drawn from 71 populations across western North America. Phylogeographic trends are inferred from analysis of the gene Cytochrome oxidase subunit I ( CoI ). Patterns of mtDNA diversity imply historical panmixia and Mid-to-late Pliocene divergence from other Speyeria approximately xx mya. Diversification within the species appears to have occurred primarily during the Pleistocene. The data partially support a hypothesis of multiple waves of diversification following the climatic fluctuations of glacial and interglacial periods. Speyeria callippe was found to be paraphyletic containing both Speyeria egleis and Speyeria edwardsii. The genetic variation observed within S. callippe was highly structured reflecting local geography. However, this did not extend to larger scales as subspecies and major color pattern groups were not recovered as monophyletic, consistent with the large amount of overlapping morphological variation. Overall, intraspecies differentiation in morphology and mtDNA observed here indicate S. callippe is a young species complex with potentially adaptive color pattern variation that is in a relatively early stage of sorting into geographically separate entities.

Pages

84

ISBN

9781321386301

To access this thesis/dissertation you must have a valid pacific.edu email address and create an account for Scholarly Commons.

Find in ProQuest

Share

COinS

If you are the author and would like to grant permission to make your work openly accessible, please email