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Multiple equilibria in metapopulation dynamics

Multiple equilibria in metapopulation dynamics THE worldwide loss and fragmentation of natural habitats1has led to considerable theory on metapopulation dynamics2á¤-8. One modelling approach, using structured population models9,10, predicts that metapopulations in which local dynamics are affected by migration may have alternative stable equilibria11á¤-17. We have tested this prediction with extensive data on the butterfly Melitaea cinxia 18,19. Here we show that the probability of local extinction decreases with increasing population size and increasing immigration rate, and that local populations tend to be larger in regions with higher density of extant populations19, results consistent with model assumptions and predictions13,17. Our results exhibit a bifurcation pattern indicating multiple equilibria14, with a strikingly bimodal distribution of the fraction of occupied habitat in 65 semi-independent patch networks. These results help to explain observations of species occupying either most, or very little, of the suitable habitat in well-connected patch networks14,20,21. Metapopulations with multiple equilibria may collapse unexpectedly to extinction even in landscapes degrading only slowly. Multiple equilibria make it difficult to predict the occurrence of species in fragmented landscapes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nature Springer Journals

Multiple equilibria in metapopulation dynamics

Nature , Volume 377 (6550) – Oct 19, 1995

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References (24)

Publisher
Springer Journals
Copyright
Copyright © 1995 by Nature Publishing Group
Subject
Science, Humanities and Social Sciences, multidisciplinary; Science, Humanities and Social Sciences, multidisciplinary; Science, multidisciplinary
ISSN
0028-0836
eISSN
1476-4687
DOI
10.1038/377618a0
Publisher site
See Article on Publisher Site

Abstract

THE worldwide loss and fragmentation of natural habitats1has led to considerable theory on metapopulation dynamics2á¤-8. One modelling approach, using structured population models9,10, predicts that metapopulations in which local dynamics are affected by migration may have alternative stable equilibria11á¤-17. We have tested this prediction with extensive data on the butterfly Melitaea cinxia 18,19. Here we show that the probability of local extinction decreases with increasing population size and increasing immigration rate, and that local populations tend to be larger in regions with higher density of extant populations19, results consistent with model assumptions and predictions13,17. Our results exhibit a bifurcation pattern indicating multiple equilibria14, with a strikingly bimodal distribution of the fraction of occupied habitat in 65 semi-independent patch networks. These results help to explain observations of species occupying either most, or very little, of the suitable habitat in well-connected patch networks14,20,21. Metapopulations with multiple equilibria may collapse unexpectedly to extinction even in landscapes degrading only slowly. Multiple equilibria make it difficult to predict the occurrence of species in fragmented landscapes.

Journal

NatureSpringer Journals

Published: Oct 19, 1995

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