Title: NICHE SEPARATION IN COMMUNITY ANALYSIS: A NEW METHOD
Abstract: EcologyVolume 81, Issue 10 p. 2914-2927 Article NICHE SEPARATION IN COMMUNITY ANALYSIS: A NEW METHOD Sylvain Dolédec, Sylvain Dolédec UMR CNRS 5023, Laboratoire d'Ecologie des Hydrosystèmes Fluviaux, Université Lyon I, 69622 Villeurbanne Cedex, FranceSearch for more papers by this authorDaniel Chessel, Daniel Chessel UMR CNRS 5558, Laboratoire de Biomérie et Biologie Evolutive, Université Lyon I, 69622 Villeurbanne Cedex, FranceSearch for more papers by this authorClémentine Gimaret-Carpentier, Clémentine Gimaret-Carpentier UMR CNRS 5558, Laboratoire de Biomérie et Biologie Evolutive, Université Lyon I, 69622 Villeurbanne Cedex, FranceSearch for more papers by this author Sylvain Dolédec, Sylvain Dolédec UMR CNRS 5023, Laboratoire d'Ecologie des Hydrosystèmes Fluviaux, Université Lyon I, 69622 Villeurbanne Cedex, FranceSearch for more papers by this authorDaniel Chessel, Daniel Chessel UMR CNRS 5558, Laboratoire de Biomérie et Biologie Evolutive, Université Lyon I, 69622 Villeurbanne Cedex, FranceSearch for more papers by this authorClémentine Gimaret-Carpentier, Clémentine Gimaret-Carpentier UMR CNRS 5558, Laboratoire de Biomérie et Biologie Evolutive, Université Lyon I, 69622 Villeurbanne Cedex, FranceSearch for more papers by this author First published: 01 October 2000 https://doi.org/10.1890/0012-9658(2000)081[2914:NSICAA]2.0.CO;2Citations: 347Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract The design and objective of a community study imply the selection of the appropriate ordination technique in terms of species response models and weighting options. In this paper, we start from the observation that existing two-table ordination techniques and related measures of niche breadth inevitably weight a sample in proportion to its abundance. We introduce a new multivariate method, which gives a more even weight to all sampling units, including those which are species poor or individual poor. We use this new method of analysis which we call OMI (for Outlying Mean Index) to address the question of niche separation and niche breadth. The Outlying Mean Index, or species marginality, measures the distance between the mean habitat conditions used by species (species centroid), and the mean habitat conditions of the sampling area (origin of the niche hyperspace), and OMI analysis places species along habitat conditions using a maximization of their mean OMI. Therefore, the position of the species depends on their niche deviation from a reference, which represents neither the mean nor the most abundant species, but a theoretical ubiquitous species that tolerates the most general habitat conditions (i.e., a hypothetical species uniformly distributed among habitat conditions). We demonstrate that OMI analysis is well suited for the investigation of multidimensional niche breadths in the case of strong limiting factors (e.g., meteorological conditions) or strong driving forces (e.g., longitudinal stream gradient). 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Publication Year: 2000
Publication Date: 2000-10-01
Language: en
Type: article
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