期刊
BIOLOGICAL INVASIONS
卷 11, 期 7, 页码 1557-1567出版社
SPRINGER
DOI: 10.1007/s10530-008-9406-z
关键词
Bottleneck; Catch-effort; Founder effect; Inbreeding; Parentage; Removal
资金
- Department of Conservation
- University of Auckland
- Top Achiever Doctoral Scholarship
- Edward and Isabel Kidson Scholarship
- Royal Society of New Zealand
- Museum National d'Histoire Naturelle, Paris
Colonists undergo non-equilibrium processes such as founder effects, inbreeding and changing population size which influence the mating system and demography of a population. Understanding these processes in colonising populations informs management and helps prevent further invasions. We sampled and genotyped most individuals of a Norway rat (Rattus norvegicus) reinvasion on Moturemu island (5 ha) in New Zealand. Population size was most likely between 30 and 33 rats. Genetic methods detected a clear bottleneck signal from the founding population. Parentage assignment revealed promiscuous mating dominated by a few individuals with increasing inbreeding, both putatively a result of small island size. Combining ecological and genetic data from a single sample allowed inferences on population structure and functioning. Invading Norway rats rapidly achieve population structure similar to established island populations despite a small number of colonists and associated inbreeding. Overcoming these initial obstacles to population establishment contributes to the global success of invasive rats.
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