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research article

Interacting populations in heterogeneous environments

Vuilleumier, Séverine  
•
Possingham, Hugh P.
2012
Ecological Modelling

To optimally manage a metapopulation, managers and conservation biologists can favor a type of habitat spatial distribution (e.g. aggregated or random). However, the spatial distribution that provides the highest habitat occupancy remains ambiguous and numerous contradictory results exist. Habitat occupancy depends on the balance between local extinction and colonization. Thus, the issue becomes even more puzzling when various forms of relationships – positive or negative co-variation – between local extinction and colonization rate within habitat types exist. Using an analytical model we demonstrate first that the habitat occupancy of a metapopulation is significantly affected by the presence of habitat types that display different extinction–colonization dynamics, considering: (i) variation in extinction or colonization rate and (ii) positive and negative co-variation between the two processes within habitat types. We consequently examine, with a spatially explicit stochastic simulation model, how different degrees of habitat aggregation affect occupancy predictions under similar scenarios. An aggregated distribution of habitat types provides the highest habitat occupancy when local extinction risk is spatially heterogeneous and high in some places, while a random distribution of habitat provides the highest habitat occupancy when colonization rates are high. Because spatial variability in local extinction rates always favors aggregation of habitats, we only need to know about spatial variability in colonization rates to determine whether aggregating habitat types increases, or not, metapopulation occupancy. From a comparison of the results obtained with the analytical and with the spatial-explicit stochastic simulation model we determine the conditions under which a simple metapopulation model closely matches the results of a more complex spatial simulation model with explicit heterogeneity.

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Type
research article
DOI
10.1016/j.ecolmodel.2011.12.028
Author(s)
Vuilleumier, Séverine  
•
Possingham, Hugh P.
Date Issued

2012

Publisher

Elsevier

Published in
Ecological Modelling
Volume

228

Issue

10

Start page

96

End page

105

Subjects

Metapopulation models

•

Heterogeneity

•

Habitat distribution

•

Population viability

•

Occupancy

•

Spatially explicit

Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
IBI-SV  
Available on Infoscience
August 31, 2016
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/128973
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