Genetic Evidence of a Population Bottleneck and Inbreeding in the Endangered New Zealand Sea Lion, Phocarctos hookeri
The New Zealand sea lion (NZSL) is of high conservation concern due to its limited distribution and its declining population size. Historically, it occupied most of coastal New Zealand, but is now restricted to a few coastal sites in southern mainland New Zealand and the sub-Antarctic Islands. NZSLs...
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ftreroch:oai:doc.rero.ch:331371 2023-05-15T13:58:13+02:00 Genetic Evidence of a Population Bottleneck and Inbreeding in the Endangered New Zealand Sea Lion, Phocarctos hookeri Osborne, Amy J. Negro, Sandra S. Chilvers, B Louise Robertson, Bruce C. Kennedy, Martin A. Gemmell, Neil J. 2021-10-05T07:24:20Z http://doc.rero.ch/record/331371/files/JHERED_107_5_392.pdf eng eng http://doc.rero.ch/record/331371/files/JHERED_107_5_392.pdf 2021 ftreroch 2023-02-16T17:34:10Z The New Zealand sea lion (NZSL) is of high conservation concern due to its limited distribution and its declining population size. Historically, it occupied most of coastal New Zealand, but is now restricted to a few coastal sites in southern mainland New Zealand and the sub-Antarctic Islands. NZSLs have experienced a recent reduction in population size due to sealing in the 1900s, which is expected to have resulted in increased inbreeding and a loss of genetic variation, potentially reducing the evolutionary capacity of the species and negatively impacting on its long-term prospects for survival. We used 17 microsatellite loci, previously shown to have cross-species applications in pinnipeds, to determine locus- and population-specific statistics for 1205 NZSLs from 7 consecutive breeding seasons. We show that the NZSL population has a moderate level of genetic diversity in comparison to other pinnipeds. We provide genetic evidence for a population reduction, likely caused by historical sealing, and a measure of allele sharing/parental relatedness (internal relatedness) that is suggestive of increased inbreeding in pups that died during recent epizootic episodes. We hypothesize that population bottlenecks and nonrandom mating have impacted on the population genetic architecture of NZSLs, affecting its population recovery. Other/Unknown Material Antarc* Antarctic RERO DOC Digital Library Antarctic New Zealand |
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RERO DOC Digital Library |
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ftreroch |
language |
English |
description |
The New Zealand sea lion (NZSL) is of high conservation concern due to its limited distribution and its declining population size. Historically, it occupied most of coastal New Zealand, but is now restricted to a few coastal sites in southern mainland New Zealand and the sub-Antarctic Islands. NZSLs have experienced a recent reduction in population size due to sealing in the 1900s, which is expected to have resulted in increased inbreeding and a loss of genetic variation, potentially reducing the evolutionary capacity of the species and negatively impacting on its long-term prospects for survival. We used 17 microsatellite loci, previously shown to have cross-species applications in pinnipeds, to determine locus- and population-specific statistics for 1205 NZSLs from 7 consecutive breeding seasons. We show that the NZSL population has a moderate level of genetic diversity in comparison to other pinnipeds. We provide genetic evidence for a population reduction, likely caused by historical sealing, and a measure of allele sharing/parental relatedness (internal relatedness) that is suggestive of increased inbreeding in pups that died during recent epizootic episodes. We hypothesize that population bottlenecks and nonrandom mating have impacted on the population genetic architecture of NZSLs, affecting its population recovery. |
author |
Osborne, Amy J. Negro, Sandra S. Chilvers, B Louise Robertson, Bruce C. Kennedy, Martin A. Gemmell, Neil J. |
spellingShingle |
Osborne, Amy J. Negro, Sandra S. Chilvers, B Louise Robertson, Bruce C. Kennedy, Martin A. Gemmell, Neil J. Genetic Evidence of a Population Bottleneck and Inbreeding in the Endangered New Zealand Sea Lion, Phocarctos hookeri |
author_facet |
Osborne, Amy J. Negro, Sandra S. Chilvers, B Louise Robertson, Bruce C. Kennedy, Martin A. Gemmell, Neil J. |
author_sort |
Osborne, Amy J. |
title |
Genetic Evidence of a Population Bottleneck and Inbreeding in the Endangered New Zealand Sea Lion, Phocarctos hookeri |
title_short |
Genetic Evidence of a Population Bottleneck and Inbreeding in the Endangered New Zealand Sea Lion, Phocarctos hookeri |
title_full |
Genetic Evidence of a Population Bottleneck and Inbreeding in the Endangered New Zealand Sea Lion, Phocarctos hookeri |
title_fullStr |
Genetic Evidence of a Population Bottleneck and Inbreeding in the Endangered New Zealand Sea Lion, Phocarctos hookeri |
title_full_unstemmed |
Genetic Evidence of a Population Bottleneck and Inbreeding in the Endangered New Zealand Sea Lion, Phocarctos hookeri |
title_sort |
genetic evidence of a population bottleneck and inbreeding in the endangered new zealand sea lion, phocarctos hookeri |
publishDate |
2021 |
url |
http://doc.rero.ch/record/331371/files/JHERED_107_5_392.pdf |
geographic |
Antarctic New Zealand |
geographic_facet |
Antarctic New Zealand |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
http://doc.rero.ch/record/331371/files/JHERED_107_5_392.pdf |
_version_ |
1766266381532135424 |