Fishing effects on diversity, size and community structure of the benthic invertebrate and fish megafauna on the Bay of Biscay coast of France

Type Article
Date 2004
Language English
Author(s) Blanchard FabianORCID1, Le Loc'h Francois2, Hily Christian2, Boucher Jean1
Affiliation(s) 1 : IFREMER, Ressources Halieut, F-29280 Plouzane, France.
2 : Univ Bretagne Occidentale, UMR CNRS 6539, LEMAR, F-29280 Plouzane, France.
Source Marine Ecology Progress Series (0171-8630) (Inter-research), 2004 , Vol. 280 , P. 249-260
DOI 10.3354/meps280249
WOS© Times Cited 58
Keyword(s) benthic communities, community dynamics, disturbance, diversity, size spectrum
Abstract Within the framework of the 'dynamic equilibrium model', we tested the hypothesis that fishing causes major disturbance to benthic communities on deeper bottoms of the continental shelf. Benthic megafauna on the Bay of Biscay coast of France was sampled on fishing grounds subject to various conditions of exploitation. Samples were taken at around 100 m depth to avoid strong natural disturbances. Species diversity and the largest body mass class of invertebrates were smaller in strongly exploited areas than in moderately exploited ones. Biomass size spectra in strongly exploited areas were characterised by a comparatively large biomass of small invertebrates, hence the K-dominance curve of abundance was either above the biomass curve, or the curves intersected. In moderately exploited areas, the K-dominance biomass curves were above the abundance curves; the dominant species were a commercial species and a benthic species sensitive to the physical effects of the fishing gears. In the heavily exploited areas, the dominant species were opportunistic carnivorous species of minor or no commercial interest. There were no dominant fish species in the most strongly exploited areas, while 2 fish species were found in the moderately exploited areas. No fragile species were found in the most exploited areas, whereas 6 fragile species were found in the moderately exploited ones. It is concluded that the differences between the most strongly exploited and the moderately exploited areas were consistent with the hypothesis.
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Blanchard Fabian, Le Loc'h Francois, Hily Christian, Boucher Jean (2004). Fishing effects on diversity, size and community structure of the benthic invertebrate and fish megafauna on the Bay of Biscay coast of France. Marine Ecology Progress Series, 280, 249-260. Publisher's official version : https://doi.org/10.3354/meps280249 , Open Access version : https://archimer.ifremer.fr/doc/00000/10896/