Linked Life Data

18028306

Source:http://linkedlifedata.com/resource/pubmed/id/18028306

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
24
pubmed:dateCreated
2007-12-20
pubmed:abstractText
Human impacts on natural systems can cause local population extinctions, which may promote redistribution of taxa and secondary contact between divergent lineages. In mammalian populations that have mating systems shaped by polygyny and sexual selection, the potential for hybridization to ensue and persist depends on individual and demographic factors. At Macquarie Island, a recently formed fur seal population is comprised of both sexes of breeding Antarctic (Arctocephalus gazella) and subantarctic (A. tropicalis) fur seals, and an itinerant collection of male New Zealand fur seals (A. forsteri), presumed to be non-breeders due to their absence from principle breeding areas. The mating system of the three species is described as resource-defence polygyny: males defend beach territories containing breeding females for exclusive mating rights. A recent genetic study identified a high level of hybridization in the population (17-30%), unexpectedly involving all three species. This study examined the source of involvement in breeding by A. forsteri with respect to mating strategies operating in the population. Ninety-five (10%) pups born from 1992 to 2003 were genetically identified as New Zealand hybrids. Most resulted from reproduction within territories by New Zealand hybrids of both sexes, although some were conceived extra-territorially, indicating that males successfully utilize strategies other than territory holding to achieve paternities. Female reproductive status influenced mating partner and mating location, and females without pups were more likely to conceive extra-territorially and with A. forsteri males. This study illustrates an important consequence of low heterospecific discrimination in a sympatric population of long-lived mammals.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0962-1083
pubmed:author
pubmed:issnType
Print
pubmed:volume
16
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
5267-76
pubmed:meshHeading
pubmed:year
2007
pubmed:articleTitle
Multiple mating strategies explain unexpected genetic mixing of New Zealand fur seals with two congenerics in a recently recolonized population.
pubmed:affiliation
Zoology Department, La Trobe University, Bundoora, Vic. 3083, Australia. melanie.lancaster@adelaide.edu.au
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't