The Role of Landscape‐Dependent Disturbance and Dispersal in Metapopulation Persistence.

Elkin, C. M. and Possingham, H.P. (2008) The Role of Landscape‐Dependent Disturbance and Dispersal in Metapopulation Persistence.. American Naturalist, 172 4: 563-575. doi:10.1086/590962

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Author Elkin, C. M.
Possingham, H.P.
Title The Role of Landscape‐Dependent Disturbance and Dispersal in Metapopulation Persistence.
Journal name American Naturalist   Check publisher's open access policy
ISSN 0003-0147
Publication date 2008-10-01
Sub-type Article (original research)
DOI 10.1086/590962
Open Access Status File (Publisher version)
Volume 172
Issue 4
Start page 563
End page 575
Total pages 13
Place of publication Chicago, IL, United States
Publisher University of Chicago Press
Language eng
Subject C1
960811 Sparseland, Permanent Grassland and Arid Zone Flora, Fauna and Biodiversity
060207 Population Ecology
Abstract The fundamental processes that influence metapopulation dynamics (extinction and recolonization) will often depend on landscape structure. Disturbances that increase patch extinction rates will frequently be landscape dependent such that they are spatially aggregated and have an increased likelihood of occurring in some areas. Similarly, landscape structure can influence organism movement, producing asymmetric dispersal between patches. Using a stochastic, spatially explicit model, we examine how landscape‐dependent correlations between dispersal and disturbance rates influence metapopulation dynamics. Habitat patches that are situated in areas where the likelihood of disturbance is low will experience lower extinction rates and will function as partial refuges. We discovered that the presence of partial refuges increases metapopulation viability and that the value of partial refuges was contingent on whether dispersal was also landscape dependent. Somewhat counterintuitively, metapopulation viability was reduced when individuals had a preponderance to disperse away from refuges and was highest when there was biased dispersal toward refuges. Our work demonstrates that landscape structure needs to be incorporated into metapopulation models when there is either empirical data or ecological rationale for extinction and/or dispersal rates being landscape dependent.
Keyword metapopulation dynamics
aggregated disturbance
asymmetric dispersal
Q-Index Code C1
Q-Index Status Confirmed Code

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Created: Wed, 11 Feb 2009, 01:23:56 EST by Gail Walter on behalf of School of Biological Sciences