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Provedor de dados:  ArchiMer
País:  France
Título:  Selective fishing and balanced harvest in relation to fisheries and ecosystem sustainability. Report of a scientific workshop organized by the IUCN-CEM Fisheries Expert Group (FEG) and the European Board of Conservation and Development (EBCD) in Nagoya (Japan) 14-16 October 2010
Autores:  Garcia, Serge
Kolding, Jeppe
Rice, Jake
Rochet, Marie-joelle
Zhou, Shijie
Arimoto, Takafumi
Borges, Lisa
Bundy, Alida
Dunn, Daniel
Graham, Norman
Hall, Martin
Heino, Mikko
Law, Richard
Makino, Mitsutaku
Rijnsdorp, Adriaan D.
Simard, François
Smith, Anthony D.m.
Symons, Despina
Data:  2011-01
Ano:  2011
Resumo:  The conventional selectivity paradigm is briefly reviewed and its performance examined from an ecosystem perspective. It is stressed that the overall (cumulative) selectivity of the harvest process in an ecosystem is the result of nested selection by fishers and fisheries of: (i) habitats; (ii) species assemblages; (iii) populations and (iv) individuals. A range of ecosystem models predict a strong impact of concentrated fishing (selective fishing) on the ecosystem structure stability, resilience and productivity. There seem to be advantages (in both yield and maintenance of ecosystem structure and functioning) to distribute fishing pressure broadly across available species and ecosystem compartments. Balanced harvesting was therefore defined by the workshop as a strategy that distributes fishing pressure across the wider possible range of trophic levels, sizes and species, in proportion to their natural productivity, reducing fishing pressure where it is excessive. The few attempts to verify the impacts predicted by models in real ecosystems with empirical data had limited success, indicating that such demonstration might be a significant challenge. Data from African small-scale fisheries were presented as a possible example of the capacity of multiple fisheries targeting an extremely broad range of species and sizes to extract high yield with limited impact on ecosystem structure. There are also a number of examples of surprising consequences of selectivity regulations resulting in either operational changes in the fishery or to unexpected shifts in the ecosystem. Emerging research priorities and management implications are reviewed.
Tipo:  Text
Idioma:  Inglês
Formato:  application/pdf
Direitos:  2011 IUCN, S. M. Garcia, (Ed.)

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