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Dispersal of annual plants in hierarchically structured landscapes

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The scale at which plants utilize spatially distributed resources may be determined by their ability to locate sites that can sustain population growth. We developed a spatially-explicit model of the dispersal of annual plants in landscapes which were hierarchically structured, i.e., the spatial pattern of suitable sites was nested and scale-dependent. Results show that colonizing ability and extinction probability are most sensitive to the mean dispersal distance of the species. Dispersal out of the parental site, but within the immediate neighborhood, was the most efficient means for population expansion. When landscape patterns change with scale then dispersal distances determine the spatial scales of habitat utilization. As a complicating factor, the type of statistical distribution of dispersal distances also influences the colonizing ability. However, the importance of dispersal distance mean and distribution decreased as the number and connectance of suitable sites increased. The results suggest that landscape models which consider the interaction between scale dependent changes in landscape pattern and species dispersal and establishment characteristics are relevant to many issues in community ecology, invasion biology, and conservation biology.

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  1. Robert H. Gardner

    Present address: Appalachian Environmental Laboratory, Center for Environmental and Estuarine Studies, University of Maryland, Gunter Hall, 1532, Frostburg, MD, USA

Authors and Affiliations

  1. Centre d'Ecologie Fonctionnelle et Evolutive, Centre National de la Recherche Scientifique, BP 5051, 34033, Montpellier, France

    Sandra Lavorel

  2. Environmental Sciences Division, Oak Ridge National Laboratory, 37831-6036, Oak Ridge, TN, USA

    Robert H. Gardner & Robert V. O'Neill

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Lavorel, S., Gardner, R.H. & O'Neill, R.V. Dispersal of annual plants in hierarchically structured landscapes. Landscape Ecol 10, 277–289 (1995). https://doi.org/10.1007/BF00128995

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