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A bio-economic analysis of long term changes in the production of French fishing fleets operating in the Bay of Biscay ArchiMer
Steinmetz, Fabien; Thebaud, Olivier; Blanchard, Fabian; Le Floc H, Pascal; Bihel, J.
Selective fishing pressure on more highly valued marine living resources is one of the key factors proposed to explain changes occurring in fish communities and associated landings of commercial fisheries. The aim of this paper is to establish the nature of changes in the landings of French fishing fleets operating in the Bay of Biscay in the period 1973-2002, and whether these changes could be related to the relative economic attractiveness of different fish species. The analysis focuses on trends observed in the landings of all commercial fish species over the last three decades. It is based on data of annual quantities landed and ex-vessel prices compiled from official French landings records, and on bio-geographical descriptors of these species derived...
Tipo: Text Palavras-chave: North Eastern Atlantic; Bay of Biscay; Long term changes; Bio economic analysis; French fisheries production.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-5926.pdf
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Diet overlap between harbour porpoise and bottlenose dolphin: An argument in favour of interference competition for food? ArchiMer
Spitz, Jérôme; Rousseau, Yann; Ridoux, Vincent.
In aquatic ecosystems, competitive interactions are occasionally described. Violent attacks on harbour porpoises by bottlenose dolphins were reported and it was proposed that this behavior could result from competitive interactions for food. This hypothesis implies that the two predators should share all or part of they prey range. In this work, we describe the diets of each predator in the Bay of Biscay and adjacent areas from stomach content analysis of stranded animals. The diet of the harbour porpoise was mostly composed of small schooling fish living close to the seafloor (98 percent by mass). The diet of the bottlenose dolphin was characterised by the presence of large specimens of demersal fish (91 percent by mass) and cephalopods. Several prey...
Tipo: Text Palavras-chave: North Eastern Atlantic; Tursiops truncatus; Phocoena phocoena; Diet; Top predator; Interference competition.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1986.pdf
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Long term synchronous trends in the recruitment of the North Eastern Atlantic fish populations related to climate change and exploitation. ArchiMer
Brunel, Thomas; Boucher, Jean.
Synchrony in population fluctuations have commonly been observed among a variety of species. They are generally attributed to the effect of common environmental forcings on population dynamics. Here, we investigate long term synchrony in the recruitment variations of the North East Atlantic fish populations. A PCA (principal component analysis) was performed to extract the main patterns of variation. The most significant one reflects the synchronous decrease of the recruitment for the majority of gadoids populations, in the Baltic Sea, Kattegat, North Sea, Irish Sea and West of Scotland. The inverse pattern was observed for half of the herring populations. Plaice populations also exhibit synchronous recruitment trends, characterised by strong year classes...
Tipo: Text Palavras-chave: Synchrony; Regime shift; Recruitment variations; North Eastern Atlantic; Climate change.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/acte-1145.pdf
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