MEPS 214:201-209 (2001)  -  doi:10.3354/meps214201

Long-term dynamics of three benthic Ampelisca (Crustacea-Amphipoda) populations from the Bay of Morlaix (western English Channel) related to their disappearance after the ŒAmoco Cadiz¹ oil spill

Jean-Christophe Poggiale1,*, Jean-Claude Dauvin2

1Centre d¹Océanologie de Marseille, Campus de Luminy, CNRS UMR 6535, Case 901, 13288 Marseille Cedex 09, France
2Station Marine de Wimereux, UPRES A 8013 ELICO, CNRS, Université de Lille des Sciences et Technologies de Lille, 28 Avenue Foch, BP 80, 62930 Wimereux, France

ABSTRACT: Many studies have dealt with the effects of the ŒAmoco Cadiz¹ wreck. In particular, they describe the influence of the oil spill on the benthic populations dynamics off northern Brittany coasts (western English Channel). Several mechanisms have been proposed to explain how communities have recolonised the area during these last 20 yr. In this paper, we focus on the dynamics of the Pierre Noire Ampelisca populations which constitute the dominant part of the total fine sand Abra alba community. We propose a discrete population dynamics model that takes into account the sea temperature, the amount of pollutant and competition. The model permits the simulation of long term changes in abundance for each of the more abundant Ampelisca species. It provides a tool for testing assumptions and for understanding the different processes occurring during recolonisation.

KEY WORDS: Population dynamics · Recurrent model · Recolonisation · Ampelisca · English Channel

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