USING NETWORK CENTRALITY MEASURES TO MANAGE LANDSCAPE CONNECTIVITY
Tóm tắt
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.
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Tài liệu tham khảo
Estrada E., 2008, “Clumpiness” mixing in complex networks, Journal of Statistical Mechanics, 03008
Estrada E., 1997, Matrix algebraic manipulations of molecular graphs. 2. Harary- and MTI-like molecular descriptors. MATCH, Communications in Mathematical and in Computer Chemistry, 35, 157
Estrada E., 1997, Matrix algebraic manipulations of molecular graphs. 1. Graph theoretical invariants based on distances and adjacency matrices. MATCH, Communications in Mathematical and in Computer Chemistry, 35, 145
Gorsuch R. L., 1983, Factor analysis
Meffe G. K., 2002, Ecosystem management: adaptive, community-based conservation
Millennium Ecosystem Assessment., 2003, Ecosystems and human well-being