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Permanent link (DOI): https://doi.org/10.7939/R3GQ5B

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The mating system, dispersal behavior and genetic structure of a collared pika (Ochotona collaris: Ochotonidae) population in the southwest Yukon, and a phylogeny of the genus Ochotona. Open Access

Descriptions

Other title
Subject/Keyword
Ochotona
Ochotonidae
population genetics
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Zgurski, Jessie
Supervisor and department
Hik, David (Biological Sciences)
Examining committee member and department
Derocher, Andrew (Biological Sciences)
Sperling, Felix (Biological Sciences)
Russello, Michael (Biology)
Schmiegelow, Fiona (Renewable Resources)
Department
Department of Biological Sciences
Specialization

Date accepted
2011-09-26T18:41:31Z
Graduation date
2011-11
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
Pikas (Ochotona, Ochotonidae) are small, short-eared lagomorphs that inhabit steppes and mountains in northern and central Asia and alpine regions in western North America. I examined the dispersal patterns, genetic structure and mating system of a collared pika (O. collaris) population from the southwest Yukon. Additionally, I reconstructed the phylogeny of the genus Ochotona using several mitochondrial genes. Limited mark-recapture data suggests that juvenile collared pikas seldom disperse over 300 m from their natal dens, and that adults rarely travel off of an established territory. This behaviour could result in frequent inbreeding if individuals tend to mate with their nearest neighbours. However, because collared pikas are difficult to capture before they have dispersed, I decided to examine their dispersal behavior using indirect genetic methods. Pikas were captured within a four-square-kilometer study site from 1999 to 2008, and each pika caught (n=364) was genotyped at fifteen variable microsatellite loci. The data revealed very fine-scale genetic structuring in the population in all but two years, which is consistent with a pattern of limited dispersal. Parentage analyses also demonstrated that collared pikas disperse a mean of approximately 600 m from their natal dens and that they display no sex-biased dispersal. The population was able to maintain its genetic diversity despite undergoing a population bottleneck, likely due to receiving a small number of immigrants from other populations. The mating system of collared pikas was largely polygynandrous, as there was evidence that both males and females produced offspring with multiple partners. Collared pikas also appear to make breeding forays to mate with individuals up to one kilometer away, and this ensures that their genes disperse and settle farther than they do. Phylogenetic analyses were conducted using two data sets: one that contained cytB and ND4 sequences from 49 Ochotona specimens and another that contained six mitochondrial genes from nine Ochotona species. Maximum-likelihood and maximum-parsimony analyses both recovered three main clades within Ochotona: one of steppe-dwelling pikas primarily from the Qinghai-Tibet Plateau, one of pikas from mountainous regions surrounding the Qinghai-Tibet Plateau, and one of alpine-dwelling pikas from northern Asia and North America.
Language
English
DOI
doi:10.7939/R3GQ5B
Rights
License granted by Jessie Zgurski (jzgurski@ualberta.ca) on 2011-09-22T05:19:15Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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