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Journal Articles Journal of the Marine Biological Association of the UK Year : 1997

Long-term changes of four macrobenthic assemblages from 1978 to 1992

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Abstract

Changes in four macrobenthic assemblages of the muddy-fine sand Abra alba community along the north-west French coast were compared using several numerical analyses (distogram, Eigen vector filtering, clustering and multi-dimensional scaling). The faunistic composition of these four assemblages continuously changed during the 1978-1992 period. These modifications are characterized by more or less rapid and abrupt successions of distinct groups of species, but the amplitude and the frequency of these changes are different between sites. Comparison of the results provided by different analyses also reveal that these four macrobenthic assemblages did not fluctuate in parallel, and that local conditions might play a key role on their temporal variations. However, it is shown that a major mesoscale climatic event, the alternation of mild and cold periods, probably also influenced the temporal variations of these four macrobenthic assemblages. Thus it is likely that there is a combination of both local and mesoscale events influencing these communities. In certain cases, changes in local conditions were the major source of variations. Sometimes the impact of the mesoscale conditions was more apparent, especially at the northern sites where the amplitude of the variations of temperature was greater.

Dates and versions

hal-03284948 , version 1 (13-07-2021)

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Jm Fromentin, F Ibanez, Jean-Claude Dauvin, Jm Dewarumez, B Elkaim. Long-term changes of four macrobenthic assemblages from 1978 to 1992. Journal of the Marine Biological Association of the UK, 1997, 77 (2), pp.287-310. ⟨10.1017/S002531540007168X⟩. ⟨hal-03284948⟩
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