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Calculating minimum discrepancy to assess the nestedness of species  assemblages
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
2009 (English)In: Community ecology, ISSN 1585-8553, Vol. 10, no 2, p. 141-145Article 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, p. 141-145
National Category
Ecology
Identifiers
URN: urn:nbn:se:miun:diva-10948DOI: 10.1556/ComEc.10.2009.2.1ISI: 000272954800001Scopus ID: 2-s2.0-73649135393OAI: oai:DiVA.org:miun-10948DiVA, id: diva2:285009
Available from: 2010-01-10 Created: 2010-01-10 Last updated: 2010-06-14Bibliographically approved

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Jonsson, Bengt Gunnar

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