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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on August 8, 2009
ICES Journal of Marine Science: Journal du Conseil 2009 66(10):2121-2132; doi:10.1093/icesjms/fsp202
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© 2009 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Can we infer dredge fishing effort from macrobenthic community structure?

M. B. Gaspar, S. Carvalho, R. Constantino, J. Tata-Regala, J. Cúrdia and C. C. Monteiro

Instituto Nacional dos Recursos Biológicos (INRB, I.P.)/IPIMAR, Avenida 5 de Outubro s/n, 8700-305 Olhão, Portugal

Correspondence to M. B. Gaspar: tel: +351 700500; fax: +351 700535; e-mail: mbgaspar{at}cripsul.ipimar.pt

Gaspar, M. B., Carvalho, S., Constantino, R., Tata-Regala, J., Cúrdia, J., and Monteiro, C. C. 2009. Can we infer dredge fishing effort from macrobenthic community structure? – ICES Journal of Marine Science, 66: 2121–2132.

The effects of commercial fishing effort (FE) on macrobenthic community structure were analysed in geographically related fishing grounds separated into three groups: non-exploited (NE), moderately exploited (ME), and highly exploited (HE). Number of species, abundance, Margalef species richness, and Shannon–Wiener diversity were significantly higher in NE than in exploited areas. The first two were also significantly higher in HE than in ME areas. Measures of taxonomic diversity differed depending on whether annelids, molluscs, and crustaceans were combined or analysed separately. Crustaceans seemed to be the most vulnerable to bivalve dredging because significantly lower values were observed for them in the HE areas than in the ME and NE areas for this group. Although the samples were taken at the end of the closed season, macrobenthic communities still showed differences that may be related to FE, especially in trophic structure. Carnivory was particularly dominant in HE areas. The ratio of carnivory to filter-feeding was significantly correlated with FE, with higher values being observed in HE areas and lower values in NE areas.

Keywords: bivalve dredging, fishing impacts, macrobenthic communities, taxonomic distinctness, trophic structure

Received 25 November 2008; accepted 7 June 2009; advance access publication 8 August 2009.


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