منابع مشابه
Minimum viable metapopulation size, extinction debt, and the conservation of a declining species.
A key question facing conservation biologists is whether declines in species' distributions are keeping pace with landscape change, or whether current distributions overestimate probabilities of future persistence. We use metapopulations of the marsh fritillary butterfly Euphydryas aurinia in the United Kingdom as a model system to test for extinction debt in a declining species. We derive para...
متن کاملExperimental tests of minimum viable population size
Fitness and rates of extinction were compared among populations of the housefly, Musca domestica L., kept either at constant effective sizes of 50, 500 or 1500 or passed through extreme founder events reducing effective size to 5. Populations were maintained for 24 generations, which for small to medium-sized mammals would be less than the 200 years suggested by Soulé et al. (1986) as necessary...
متن کاملA Deterministic Size Structured Metapopulation Model
A metapopulation model is presented for species which can reach high population densities per patch, and for which migration is such a frequent event that it influences local patch dynamics. Depending on the local dynamics chosen and the way patch extinction is modelled, there can exist stable and bi-stable situations. The model is compared to winking-patch models, and single population models....
متن کاملA Metapopulation Model with Discrete Size Structure
We consider a discrete size-structured metapopulation model with the proportions of patches occupied by n individuals as dependent variables. Adults are territorial and stay on a certain patch. The juveniles may emigrate to enter a dispersers’ pool from which they can settle on another patch and become adults. Absence of colonization and absence of emigration lead to extinction of the metapopul...
متن کاملMinimum viable population size of capercaillie Tetrao urogallus: results from a stochastic model
© WILDLIFE BIOLOGY · 6:4 (2000) Even if the mean rate of population growth is positive, populations are in danger of becoming extinct if they are too small to buffer environmental and demographic fluctuations. But how small is 'too small'? Answering this question is important to guide management decisions in fragmented landscapes. Therefore, a major task of conservation biology is to determine ...
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ژورنال
عنوان ژورنال: The American Naturalist
سال: 1996
ISSN: 0003-0147,1537-5323
DOI: 10.1086/285864