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SHAPE ANALYSIS OF TEMPORAL ECOLOGICAL PROCESSES: LONG-TERM CHANGES IN ENGLISH CHANNEL MACROBENTHIC COMMUNITIES

Frédéric Ibanez and Jean-Claude Dauvin
Coenoses
Vol. 13, No. 3 (Autumn 1998), pp. 115-129
Published by: Akadémiai Kiadó
Stable URL: http://www.jstor.org/stable/43461224
Page Count: 15
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
SHAPE ANALYSIS OF TEMPORAL ECOLOGICAL PROCESSES: LONG-TERM CHANGES IN ENGLISH CHANNEL MACROBENTHIC COMMUNITIES
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Abstract

Long-term benthic times series data reflect the impact of anthropogenic or hydroclimatic factors, as well as biological behaviour strategies. A numerical method known as 'typology of shapes of series' (TSS) can be used to clear up this complexity. The method is illustrated using macrobenthic data set from the western part of the English Channel (48 species, regularly sampled from 1977 to 1992). TSS is based on the concept that the shape of temporal variation in species abundance gives precise information on responses to environmental variables at different scales, and on reproductive strategy. Shape is characterised by four indices that describe the intensity of year to year and seasonal variations, and the degree of intermittence of the series. 12 groups of similar shapes were detected from the 48 species. Separate analyses were made on groups of species with strong long-term trends, regular seasonal variations, and those of sporadic occurrence. Species abundances were affected by the 1978 'Amoco Cadiz' oil spill, as well as by variation of hydro-climatic parameters.

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