Why dispersal should be maximized at intermediate scales of heterogeneity

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dc.contributor.author Skelsey, Peter
dc.contributor.author With, Kimberly A.
dc.contributor.author Garrett, Karen A.
dc.date.accessioned 2013-07-16T19:06:19Z
dc.date.available 2013-07-16T19:06:19Z
dc.date.issued 2013-07-16
dc.identifier.uri http://hdl.handle.net/2097/15981
dc.description.abstract Dispersal is a fundamental biological process that results in the redistribution of organisms due to the interplay between the mode of dispersal, the range of scales over which movement occurs, and the scale of spatial heterogeneity, in which patchiness may occur across a broad range of scales. Despite the diversity of dispersal mechanisms and dispersal length scales in nature, we posit that a fundamental scaling relationship should exist between dispersal and spatial heterogeneity. We present both a conceptual model and mathematical formalization of this expected relationship between the scale of dispersal and the scale of patchiness, which predicts that the magnitude of dispersal (number of individuals) among patches should be maximized when the scale of spatial heterogeneity (defined in terms of patch size and isolation) is neither too fine nor too coarse relative to the gap-crossing abilities of a species. We call this the “dispersal scaling hypothesis” (DSH). We demonstrate congruence in the functional form of this relationship under fundamentally different dispersal assumptions, using well-documented isotropic dispersal kernels and empirically derived dispersal parameters from diverse species, in order to explore the generality of this finding. The DSH generates testable hypotheses as to when and under what landscape scenarios dispersal is most likely to be successful. This provides insights into what management scenarios might be necessary to either restore landscape connectivity, as in certain conservation applications, or disrupt connectivity, as when attempting to manage landscapes to impede the spread of an invasive species, pest, or pathogen. en_US
dc.language.iso en_US en_US
dc.relation.uri http://link.springer.com/article/10.1007/s12080-012-0171-3 en_US
dc.subject Spatial heterogeneity en_US
dc.subject Movement en_US
dc.subject Population connectivity en_US
dc.subject Patchiness en_US
dc.subject Habitat fragmentation en_US
dc.subject Matrix resistance en_US
dc.title Why dispersal should be maximized at intermediate scales of heterogeneity en_US
dc.type Article (publisher version) en_US
dc.date.published 2013 en_US
dc.citation.doi doi:10.1007/s12080-012-0171-3 en_US
dc.citation.epage 211 en_US
dc.citation.issue 2 en_US
dc.citation.jtitle Theoretical Ecology en_US
dc.citation.spage 203 en_US
dc.citation.volume 6 en_US
dc.contributor.authoreid kwith en_US
dc.contributor.authoreid kgarrett en_US


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