Postcopulatory selection for dissimilar gametes maintains heterozygosity in the endangered North Atlantic right whale

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dc.creator Frasier, Timothy, 1976-
dc.creator Gillett, R. M.
dc.creator Hamilton, P. K.
dc.creator Brown, M. W.
dc.creator Kraus, S. D.
dc.creator White, B. N.
dc.date.accessioned 2018-03-13T12:29:48Z
dc.date.available 2018-03-13T12:29:48Z
dc.date.issued 2013-09
dc.identifier.issn 2045-7758
dc.identifier.uri http://library2.smu.ca/handle/01/27351
dc.description Publisher's Version/PDF
dc.description.abstract Although small populations are expected to lose genetic diversity through genetic drift and inbreeding, a number of mechanisms exist that could minimize this genetic decline. Examples include mate choice for unrelated mates and fertilization patterns biased toward genetically dissimilar gametes. Both processes have been widely documented, but the long-term implications have received little attention. Here, we combined over 25 years of field data with high-resolution genetic data to assess the long-term impacts of biased fertilization patterns in the endangered North Atlantic right whale. Offspring have higher levels of microsatellite heterozygosity than expected from this gene pool (effect size = 0.326, P < 0.011). This pattern is not due to precopulatory mate choice for genetically dissimilar mates (P < 0.600), but instead results from postcopulatory selection for gametes that are genetically dissimilar (effect size = 0.37, P < 0.003). The long-term implication is that heterozygosity has slowly increased in calves born throughout the study period, as opposed to the slight decline that was expected. Therefore, this mechanism represents a natural means through which small populations can mitigate the loss of genetic diversity over time. en_CA
dc.language.iso en en_CA
dc.publisher Wiley-Blackwell en_CA
dc.subject.lcsh Right whales-- Genetics
dc.subject.lcsh Right whales -- Variation
dc.subject.lcsh Right whales -- Reproduction
dc.title Postcopulatory selection for dissimilar gametes maintains heterozygosity in the endangered North Atlantic right whale en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Ecology and Evolution 3(10), 3483-3494. (2013), doi: 10.1002/ece3.738 en_CA


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