Reproductive and dispersal strategies of male arctic ground squirrels (Spermophilus parryii plesius).
I used behavioral and biochemical data to examine the adaptive significance of intraspecific variation in the reproductive and dispersal strategies of male arctic ground squirrels (Spermophilus parryii plesius). The population studied was located in the Kluane Game Sanctuary, Yukon, Canada. Females...
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ftumdeepblue:oai:deepblue.lib.umich.edu:2027.42/128816 2024-01-07T09:41:26+01:00 Reproductive and dispersal strategies of male arctic ground squirrels (Spermophilus parryii plesius). Lacey, Eileen Anne Alexander, Richard D. 1991 236 p. application/pdf https://hdl.handle.net/2027.42/128816 http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:9208584 English EN eng http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:9208584 https://hdl.handle.net/2027.42/128816 Arctic Canada Dispersal Ground Male Parryii Plesius Reproduction Reproductive Spermophilus Squirrels Strategies Yukon Thesis 1991 ftumdeepblue 2023-12-10T17:55:11Z I used behavioral and biochemical data to examine the adaptive significance of intraspecific variation in the reproductive and dispersal strategies of male arctic ground squirrels (Spermophilus parryii plesius). The population studied was located in the Kluane Game Sanctuary, Yukon, Canada. Females in this population regularly mated with more than 1 male during a single period of sexual receptivity; electrophoretic paternity exclusion analyses indicated that litters were typically sired by a female's first mate. I found that male reproductive behavior varied as a function of mating order and, hence, the likelihood of siring young. Specifically, reproductive competition among males appeared to be most intense prior to a female's first copulation. Reproductive males defended territories during the period between the birth and weaning of young. Non-reproductive males that immigrated to the study site during this period established residence on burrow systems occupied by lactating females; changes in burrow ownership invariably resulted in the loss of those females' litters. Paternity exclusion analyses indicated that males were typically the sires of litters reared on their territories. Territory defense significantly increased juvenile survival by preventing burrow takeovers by immigrants. Reproductive males benefitted from territory defense by increasing the survival of probable offspring; I suggest that territory defense between the birth and weaning of young functioned as a form of paternal care. Although most males in the study population dispersed as juveniles, some males delayed dispersal until their yearling season. Whereas juvenile-dispersers were reproductively active as yearlings, yearling-dispersers did not reproduce until they were 2 years old. Yearling-dispersers were slow growing individuals whose body weights remained less than those of juvenile-dispersers until mid-way through their yearling season. Non-reproductive yearlings were implicated in burrow takeovers that resulted in litter loss. ... Thesis Arctic Yukon University of Michigan: Deep Blue Arctic Canada Yukon |
institution |
Open Polar |
collection |
University of Michigan: Deep Blue |
op_collection_id |
ftumdeepblue |
language |
English |
topic |
Arctic Canada Dispersal Ground Male Parryii Plesius Reproduction Reproductive Spermophilus Squirrels Strategies Yukon |
spellingShingle |
Arctic Canada Dispersal Ground Male Parryii Plesius Reproduction Reproductive Spermophilus Squirrels Strategies Yukon Lacey, Eileen Anne Reproductive and dispersal strategies of male arctic ground squirrels (Spermophilus parryii plesius). |
topic_facet |
Arctic Canada Dispersal Ground Male Parryii Plesius Reproduction Reproductive Spermophilus Squirrels Strategies Yukon |
description |
I used behavioral and biochemical data to examine the adaptive significance of intraspecific variation in the reproductive and dispersal strategies of male arctic ground squirrels (Spermophilus parryii plesius). The population studied was located in the Kluane Game Sanctuary, Yukon, Canada. Females in this population regularly mated with more than 1 male during a single period of sexual receptivity; electrophoretic paternity exclusion analyses indicated that litters were typically sired by a female's first mate. I found that male reproductive behavior varied as a function of mating order and, hence, the likelihood of siring young. Specifically, reproductive competition among males appeared to be most intense prior to a female's first copulation. Reproductive males defended territories during the period between the birth and weaning of young. Non-reproductive males that immigrated to the study site during this period established residence on burrow systems occupied by lactating females; changes in burrow ownership invariably resulted in the loss of those females' litters. Paternity exclusion analyses indicated that males were typically the sires of litters reared on their territories. Territory defense significantly increased juvenile survival by preventing burrow takeovers by immigrants. Reproductive males benefitted from territory defense by increasing the survival of probable offspring; I suggest that territory defense between the birth and weaning of young functioned as a form of paternal care. Although most males in the study population dispersed as juveniles, some males delayed dispersal until their yearling season. Whereas juvenile-dispersers were reproductively active as yearlings, yearling-dispersers did not reproduce until they were 2 years old. Yearling-dispersers were slow growing individuals whose body weights remained less than those of juvenile-dispersers until mid-way through their yearling season. Non-reproductive yearlings were implicated in burrow takeovers that resulted in litter loss. ... |
author2 |
Alexander, Richard D. |
format |
Thesis |
author |
Lacey, Eileen Anne |
author_facet |
Lacey, Eileen Anne |
author_sort |
Lacey, Eileen Anne |
title |
Reproductive and dispersal strategies of male arctic ground squirrels (Spermophilus parryii plesius). |
title_short |
Reproductive and dispersal strategies of male arctic ground squirrels (Spermophilus parryii plesius). |
title_full |
Reproductive and dispersal strategies of male arctic ground squirrels (Spermophilus parryii plesius). |
title_fullStr |
Reproductive and dispersal strategies of male arctic ground squirrels (Spermophilus parryii plesius). |
title_full_unstemmed |
Reproductive and dispersal strategies of male arctic ground squirrels (Spermophilus parryii plesius). |
title_sort |
reproductive and dispersal strategies of male arctic ground squirrels (spermophilus parryii plesius). |
publishDate |
1991 |
url |
https://hdl.handle.net/2027.42/128816 http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:9208584 |
geographic |
Arctic Canada Yukon |
geographic_facet |
Arctic Canada Yukon |
genre |
Arctic Yukon |
genre_facet |
Arctic Yukon |
op_relation |
http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:9208584 https://hdl.handle.net/2027.42/128816 |
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1787422236573958144 |