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Scale-dependent role of demography and dispersal on the distribution of populations in heterogeneous landscapes

  • Both dispersal and local demographic processes determine a population's distribution among habitats of varying quality, yet most theory, experiments, and field studies have focused on the former. We use a generic model to show how both processes contribute to a population's distribution, and how the relative importance of each mechanism depends on scale. In contrast to studies only considering habitat-dependent dispersal, we show that predictions of ideal free distribution (IFD) theory are relevant even at landscape scales, where the assumptions of IFD theory are violated. This is because scales that inhibit one process, promote the other's ability to drive populations to the IFD. Furthermore, because multiple processes can generate IFDs, the pattern alone does not specify a causal mechanism. This is important because populations with IFDs generated by dispersal or demography respond much differently to shifts in resource distributions.

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Metadaten
Author details:Benjamin T. Martin, Sergiusz Czesny, David H. Wahl, Volker GrimmORCiDGND
DOI:https://doi.org/10.1111/oik.02345
ISSN:0030-1299
ISSN:1600-0706
Title of parent work (English):Oikos
Publisher:Wiley-Blackwell
Place of publishing:Hoboken
Publication type:Article
Language:English
Year of first publication:2016
Publication year:2016
Release date:2020/03/22
Volume:125
Number of pages:7
First page:667
Last Page:673
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Biochemie und Biologie
Peer review:Referiert
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