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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

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Mapping spatial variation in demersal fish species diversity and composition in the North Sea: accounting for species- and size-related catchability in survey trawls Fraser, H.M.; Greenstreet, S.P.R.; Fryer, R.J.; Piet, G.J. (2008). Mapping spatial variation in demersal fish species diversity and composition in the North Sea: accounting for species- and size-related catchability in survey trawls. ICES J. Mar. Sci./J. Cons. int. Explor. Mer 65(4): 531-538. http://dx.doi.org/10.1093/icesjms/fsn036 In: ICES Journal of Marine Science. Academic Press: London. ISSN 1054-3139; e-ISSN 1095-9289, meer

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Beschikbaar in	Auteurs
VLIZ: Open access 138601 [ download pdf ]

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Trefwoorden

Biodiversity Catchability Catching methods > Net fishing > Trawling Composition > Community composition Spatial variations Species diversity ANE, Noordzee [Marine Regions] Marien/Kust

Author keywords

groundfish survey data; marine protected areas; size-reiatedcatchability; species diversity; species-related catchability; speciesrichness

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Auteurs		Top
Fraser, H.M. Greenstreet, S.P.R. Fryer, R.J. Piet, G.J., meer

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Abstract

The paper maps spatial patterns of groundfish species diversity. It considers how the catchability of different fish species in two different types of bottom trawls, the IBTS GOV and the 8-m beam trawl, influences the estimates of species diversity. Maps of groundfish species diversity derived from these two survey trawls are compared to determine the extent to which the maps of spatial variation in groundfish species diversity are influenced by gear type. Catchability-at-length coefficients were applied to the IBTS data to raise the observed catches to estimates of "actual" numbers of fish present in the path of the trawl, which are then used to produce maps of "actual" species diversity across the North Sea. Finally, these raised maps of "actual" groundfish species diversity are shown to be more explainable based on physical environmental parameters such as depth. We suggest that species diversity maps that take account of catchability provide more reliable information on which to base management decisions than "gear-biased" views. The implications for management are discussed, with particular emphasis on using closed areas to conserve marine biodiversity.

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