Calculating minimum discrepancy to assess the nestedness of species assemblages

Roberge, J.-M. and Bokma, F. and Mönkkönen, M. and Jonsson, B. G. (2009) Calculating minimum discrepancy to assess the nestedness of species assemblages. Community Ecology, 10 (2). pp. 141-145. ISSN 1585-8553

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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.

Item Type: Article
Subjects: Q Science / természettudomány > QH Natural history / természetrajz > QH540 Ecology / ökológia
Depositing User: xBarbara xBodnár
Date Deposited: 14 Nov 2017 06:36
Last Modified: 14 Nov 2017 06:36

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