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Modelling the effects of fishing on the North Sea fish community size composition ArchiMer
Speirs, Douglas C.; Greenstreet, Simon P. R.; Heath, Michael R..
Ecosystem-based management of the North Sea demersal fish community uses the large fish indicator (LFI), defined as the proportion by weight of fish caught in the International Bottom Trawl Survey (IBTS) exceeding a length of 40 cm. Current values of the LFI are similar to 0.15, but the European Union (EU) Marine Strategy Framework Directive (MSFD) requires a value of 0.3 be reached by 2020. An LFI calculated from an eight-species subset correlated closely with the full community LFI, thereby permitting an exploration of the effects of various fishing scenarios on projected values of the LFI using an extension of a previously published multi-species length-structured model that included these key species. The model replicated historical changes in biomass...
Tipo: Text Palavras-chave: Length-structured population model; Multi-species model; North Sea; Fisheries; Ecosystem-based management; Large fish indicator (LFI).
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00332/44355/43954.pdf
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Redundancy in metrics describing the composition, structure, and functioning of the North Sea demersal fish community ArchiMer
Greenstreet, Simon P. R.; Fraser, Helen M.; Rogers, Stuart I.; Trenkel, Verena; Simpson, Stephen; Pinnegar, John K..
Broader ecosystem management objectives for North Sea demersal fish currently focus on restoring community size structure. However, most policy drivers explicitly concentrate on restoring and conserving biodiversity, and it has not yet been established that simply restoring demersal fish size composition will be sufficient to reverse declines in biodiversity and ensure a generally healthy community. If different aspects of community composition, structure, and function vary independently, then to monitor all aspects of community general health will require application of a suite of metrics. This assumes low redundancy among the metrics used in any such suite and implies that addressing biodiversity issues specifically will require explicit management...
Tipo: Text Palavras-chave: Community health; Community size structure; Ecosystem approach to management; Life-history-trait metrics; Metric suites; Species diversity; State indicators.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00056/16709/14201.pdf
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