FISHERIES LANDINGS BY FUNCTIONAL GROUPS IN THE LARGE MARINE ECOSYSTEMS (1950-2004): ANALYSIS OF TRENDS AND SYNCHRONIES

Abstract : The historical dynamics (1950-2004) of regional fisheries within the Large Marine Ecosystems (LMEs) boundaries are analysed. Data from 51 LMEs (excluded those LMEs from Polar Oceans) have been extracted from the Sea Around Us Project database (available on-line at www.seaaroundus.org) to detect trends in total yields and variations in catch composition by functional groups over time. The high level of aggregation of catch data (i.e. functional groups) is proposed as a closer descriptor of fisheries dynamics at larger spatial scales with respect to a finer taxa resolution (e.g. species), as fishing gears usually target multiple taxa which share a common environment (e.g. demersal species are all harvested by trawls). Following these considerations, the relationships between regional dynamics and geographic position of each LME are investigated, as well as the potential synchronies between functional groups. Furthermore, the temporal analysis of the association between catch composition and geographic location of each LME shows that this relationship, although still significant, experienced a constant decline over the fifty years, indicating that dissociation, though feeble, is being established. This result is consistent with the increase of fisheries pressures (improved technologies of vessels and fishing gears) from 1950 onwards, and with market demand, which contribute to a homogenization of catches all over the world. Furthermore, preliminary results regarding the analysis of relative influence of environmental, geographic and socio-economic variables on total yields harvested in the last decade are addressed.
Type de document :
Communication dans un congrès
ClimECO2 International Summer School - Oceans, Marine Ecosystems, and Society facing Climate Change, Aug 2010, Brest, France
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http://hal.univ-brest.fr/hal-00502325
Contributeur : Ivo Grigorov <>
Soumis le : mardi 13 juillet 2010 - 17:31:13
Dernière modification le : vendredi 23 février 2018 - 01:02:54

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  • HAL Id : hal-00502325, version 1

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Lorenza Conti, Michele Scardi, Lek Sovan, Grenouillet Gaël. FISHERIES LANDINGS BY FUNCTIONAL GROUPS IN THE LARGE MARINE ECOSYSTEMS (1950-2004): ANALYSIS OF TRENDS AND SYNCHRONIES. ClimECO2 International Summer School - Oceans, Marine Ecosystems, and Society facing Climate Change, Aug 2010, Brest, France. 〈hal-00502325〉

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