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Calculating minimum discrepancy to assess the nestedness of species assemblages
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2009 (English)In: COMMUNITY ECOL, ISSN 1585-8553, Vol. 10, no 2, 141-145 p.Article in journal (Refereed) Published
Abstract [en]

Nestedness is a pattern whereby species-poor assemblages are composed of subsets of the species occurring in richer assemblages. One of the most commonly used measures of the degree of nestedness for presence-absence matrices is the 'discrepancy' metric. A hitherto neglected property of that metric is that it may take several values for a given site-by-species matrix in the presence of ties in the marginal totals. This complicates the quantification of nestedness for the observed presence-absence matrix, as well as the assessment of statistical significance, which is typically achieved through Monte Carlo simulations. A solution to the problem is to calculate the minimum discrepancy using a modified algorithm involving permutations of columns with tied totals.

Place, publisher, year, edition, pages
2009. Vol. 10, no 2, 141-145 p.
Keyword [en]
Ecological communities, Nested subsets, Nestedness metrics, Presence-absence matrices, Species composition
URN: urn:nbn:se:umu:diva-52210DOI: 10.1556/ComEc.10.2009.2.1ISI: 000272954800001OAI: diva2:500126
Available from: 2012-02-13 Created: 2012-02-13 Last updated: 2012-02-13

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Bokma, F.
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Department of Ecology and Environmental Sciences

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