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dc.contributor.authorShephard, S.
dc.contributor.authorGerritsen, H. D.
dc.contributor.authorKaiser, M. J.
dc.contributor.authorTruszkowska, H. S.
dc.contributor.authorReid, D. G.
dc.identifier.citationShephard, S. Gerritsen, H. D.; Kaiser, M. J.; Truszkowska, H. S.; Reid, D. G. (2011). Fishing and environment drive spatial heterogeneity in celtic sea fish community size structure. ICES Journal of Marine Science 68 (10), 2106-2113
dc.description.abstractThe Large Fish Indicator (LFI) is a univariate size-based indicator of fish community state that has been selected to support the OSPAR fish community Ecological Quality Objective (EcoQO). To operate this EcoQO, a survey-based LFI for each OSPAR region needs to be developed. However, fish communities in these regions are spatially heterogeneous, and there is evidence of within-region spatial variation in the LFI that could confound an overall indicator series. For Celtic Sea trawl-survey sites, spline correlograms indicate positive spatial autocorrelation at a similar range (similar to 40 km) for the LFI and for fishing effort (h year(-1)) from vessel monitoring systems. Statistical models reveal a strong negative effect on annual LFI by site of fishing effort within a radius of 40 km. There was a weak effect of fishing within 20 km and no effect at 10 km. LFI also varied significantly with substratum and with local fish community composition identified by a resemblance matrix derived from the survey data. Finally, there was a weak effect of survey year on LFI. Spatial stratification of LFI calculations may be necessary when developing size-based indicators for OSPAR or Marine Strategy Framework Directive regions.
dc.publisherOxford University Press (OUP)
dc.relation.ispartofICES Journal of Marine Science
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Ireland
dc.subjectecological quality objective
dc.subjectecosystem approach to fisheries management
dc.subjectlarge fish indicator
dc.subjectmarine protected areas
dc.subjectmarine protected areas
dc.subjectfisheries management
dc.subjecthabitat association
dc.titleFishing and environment drive spatial heterogeneity in celtic sea fish community size structure

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