Nonlinear multivariate models of successional change in community structure using the von Bertalanffy curve |
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Authors: | Email author" target="_blank">Marti?J?AndersonEmail author Russell?B?Millar Wilma?M?Blom Carol?E?Diebel |
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Institution: | (1) Department of Statistics, University of Auckland, Private Bag 92019, Auckland, New Zealand;(2) Auckland War Memorial Museum, Marine Biology Collections, Private Bag 92018, Auckland, New Zealand;(3) Curator of Marine Biology Collections, Auckland War Memorial Museum, Private Bag 92018, Auckland, New Zealand;(4) Present address: Director of Natural Environment, Te Papa Tongarewa—National Museum of New Zealand, 169 Tory St., Wellington, New Zealand |
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Abstract: | von Bertalanffy curves were used to describe the nonlinear relationship between assemblages inhabiting holdfasts of the kelp Ecklonia radiata and the volume of the holdfast. This was done using nonlinear canonical analyses of principal coordinates (NCAP). The volume of the holdfast is a proxy for the age of the plant and, thus, the canonical axis is a proxy for succession in the marine invertebrate community inhabiting the holdfast. Analyses were done at several different taxonomic resolutions on the basis of various dissimilarity measures. Assemblages in relatively large holdfasts demonstrated ongoing variation in community structure with increasing volume when the dissimilarity used was independent of sample size. Smaller holdfasts had proportionately greater abundances of ophiuroids and encrusting organisms (bryozoans, sponges, ascidians), while larger holdfasts were characterised by proportionately greater abundances of crustaceans, polychaetes and molluscs. Such linear and nonlinear multivariate models may be applied to analyse system-level responses to the growth of many habitat-forming organisms, such as sponges, coral reefs, coralline algal turf or forest canopies. |
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Keywords: | Biodiversity Community composition Kelp holdfast assemblages Marine invertebrates Succession |
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