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Using network centrality measures to manage landscape connectivity
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Government.
2008 (English)In: Ecological Applications, ISSN 1051-0761, Vol. 18, no 7, 1810-1825 p.Article in journal (Refereed) Published
Abstract [en]

We use a graph-theoretical landscape modeling approach to investigate how to identify central patches in the landscape as well as how these central patches influence (1) organism movement within the local neighborhood and (2) the dispersal of organisms beyond the local neighborhood. Organism movements were theoretically estimated based on the spatial configuration of the habitat patches in the studied landscape. We find that centrality depends on the way the graph-theoretical model of habitat patches is constructed, although even the simplest network representation, not taking strength and directionality of potential organisms flows into account, still provides a coarse-grained assessment of the most important patches according to their contribution to landscape connectivity. Moreover, we identify (at least) two general classes of centrality. One accounts for the local flow of organisms in the neighborhood of a patch, and the other accounts for the ability to maintain connectivity beyond the scale of the local neighborhood. Finally, we study how habitat patches with high scores on different network centrality measures are distributed in a fragmented agricultural landscape in Madagascar. Results show that patches with high degree and betweenness centrality are widely spread, while patches with high subgraph and closeness centrality are clumped together in dense clusters. This finding may enable multispecies analyses of single-species network models.

Place, publisher, year, edition, pages
2008. Vol. 18, no 7, 1810-1825 p.
Keyword [en]
betweenness centrality, complex networks, conservation, factor analysis, graph theory, habitat patch, landscape connectivity, landscape ecology and management, network centrality, network representations, subgraph centrality
National Category
Other Environmental Engineering
URN: urn:nbn:se:uu:diva-107888DOI: 10.1890/07-1419.1ISI: 000259555900020OAI: oai:DiVA.org:uu-107888DiVA: diva2:233440
Available from: 2009-09-01 Created: 2009-08-31 Last updated: 2009-09-01Bibliographically approved

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