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dc.contributor.author Joppa, LN
dc.contributor.author Montoya, JM
dc.contributor.author Solé, R
dc.contributor.author Sanderson, J
dc.contributor.author Pimm, SL
dc.date.accessioned 2011-06-21T17:32:26Z
dc.date.issued 2010-01-01
dc.identifier.citation Evolutionary Ecology Research, 2010, 12 (1), pp. 35 - 46
dc.identifier.issn 1522-0613
dc.identifier.uri http://hdl.handle.net/10161/4631
dc.description.abstract Questions: Are interaction patterns in species interaction networks different from what one expects by chance alone? In particular, are these networks nested - a pattern where resources taken by more specialized consumers form a proper subset of those taken by more generalized consumers? Organisms: Fifty-nine and 42 networks of mutualistic and host-parasitoid interactions, respectively. Analytical methods: For each network, the observed degree of nestedness is compared with the distribution of nestedness values derived from a collection of 1000 random networks. Those networks with nestedness values lower than 95% of all random values are considered 'unusually nested'. The analysis considers two different metrics of nestedness and five different network randomization algorithms, each of which differs in the ecological assumptions imposed. Results: Most ecological networks are unusually nested when compared with loosely constrained random networks. Comparisons with highly constrained networks temper these findings, but we still report a significant preponderance of nested networks (typically those with the most species). Conclusions: Bascompte et al. (2003) previously showed most observed mutualistic networks to be unusually nested. Later work using more ecologically realistic randomization algorithms cast doubt on those results. Across the largest set of species interactions considered to date, we conclude that an unexpectedly large number of interaction networks are patterned in a non-random manner. © 2010 Stuart L. Pimm.
dc.format.extent 35 - 46
dc.language.iso en_US en_US
dc.relation.ispartof Evolutionary Ecology Research
dc.title On nestedness in ecological networks
dc.title.alternative en_US
dc.type Journal Article
dc.description.version Version of Record en_US
duke.date.pubdate 2010-1-0 en_US
duke.description.endpage 46 en_US
duke.description.issue 1 en_US
duke.description.startpage 35 en_US
duke.description.volume 12 en_US
dc.relation.journal Evolutionary Ecology Research en_US
pubs.issue 1
pubs.organisational-group /Duke
pubs.organisational-group /Duke/Nicholas School of the Environment
pubs.organisational-group /Duke/Nicholas School of the Environment/Environmental Sciences and Policy
pubs.publication-status Published
pubs.volume 12

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