Restricted mating dispersal and strong breeding group structure in a mid-sized marsupial mammal (Petrogale penicillata)

Hazlitt, S. L., Sigg, D. P., Eldridge, M. D. B. and Goldizen, A. W. (2006) Restricted mating dispersal and strong breeding group structure in a mid-sized marsupial mammal (Petrogale penicillata). Molecular Ecology, 15 10: 2997-3007. doi:10.1111/j.1365-294X.2006.02985.X


Author Hazlitt, S. L.
Sigg, D. P.
Eldridge, M. D. B.
Goldizen, A. W.
Title Restricted mating dispersal and strong breeding group structure in a mid-sized marsupial mammal (Petrogale penicillata)
Journal name Molecular Ecology   Check publisher's open access policy
ISSN 0962-1083
Publication date 2006-01-01
Sub-type Article (original research)
DOI 10.1111/j.1365-294X.2006.02985.X
Volume 15
Issue 10
Start page 2997
End page 3007
Total pages 11
Place of publication Oxford
Publisher Blackwell Publishing
Language eng
Subject C1
270203 Population and Ecological Genetics
780105 Biological sciences
Abstract Ecological genetic studies have demonstrated that spatial patterns of mating dispersal, the dispersal of gametes through mating behaviour, can facilitate inbreeding avoidance and strongly influence the structure of populations, particularly in highly philopatric species. Elements of breeding group dynamics, such as strong structuring and sex-biased dispersal among groups, can also minimize inbreeding and positively influence levels of genetic diversity within populations. Rock-wallabies are highly philopatric mid-sized mammals whose strong dependence on rocky terrain has resulted in series of discreet, small colonies in the landscape. Populations show no signs of inbreeding and maintain high levels of genetic diversity despite strong patterns of limited gene flow within and among colonies. We used this species to investigate the importance of mating dispersal and breeding group structure to inbreeding avoidance within a 'small' population. We examined the spatial patterns of mating dispersal, the extent of kinship within breeding groups, and the degree of relatedness among brush-tailed rock-wallaby breeding pairs within a colony in southeast Queensland. Parentage data revealed remarkably restricted mating dispersal and strong breeding group structuring for a mid-sized mammal. Breeding groups showed significant levels of female kinship with evidence of male dispersal among groups. We found no evidence for inbreeding avoidance through mate choice; however, anecdotal data suggest the importance of life history traits to inbreeding avoidance between first-degree relatives. We suggest that the restricted pattern of mating dispersal and strong breeding group structuring facilitates inbreeding avoidance within colonies. These results provide insight into the population structure and maintenance of genetic diversity within colonies of the threatened brush-tailed rock-wallaby.
Keyword Breeding Group Structure
Inbreeding Avoidance
Mating Dispersal
Microsatellites
Petrogale
Rock-wallaby
Biochemistry & Molecular Biology
Ecology
Evolutionary Biology
Wombat Lasiorhinus-krefftii
Bridled Nailtail Wallabies
Microsatellite Markers
Reproductive Success
Macropus-giganteus
Female Philopatry
Genetic-variation
Age Estimation
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 19:11:28 EST