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ICES Journal of Marine Science: Journal du Conseil Advance Access published online on September 15, 2009
ICES Journal of Marine Science: Journal du Conseil, doi:10.1093/icesjms/fsp226
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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

Stalked barnacle (Pollicipes pollicipes) harvesting in the Berlengas Nature Reserve, Portugal: temporal variation and validation of logbook data

David Jacinto1, Teresa Cruz1,2, Teresa Silva1 and João J. Castro1,2

1 Laboratório de Ciências do Mar (CIEMAR), Universidade de Évora, Apartado 190, 7520-903 Sines, Portugal, and Centro de Oceanografia, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
2 Departamento de Biologia, Universidade de Évora, 7002-554 Évora, Portugal

Correspondence to D. Jacinto: Tel: +351 269 634 250; fax: +351 269 862 057; e-mail: djacinto{at}uevora.pt.

Jacinto, D., Cruz, T., Silva, T., and Castro, J. J. 2010. Stalked barnacle (Pollicipes pollicipes) harvesting in the Berlengas Nature Reserve, Portugal: temporal variation and validation of logbook data. – ICES Journal of Marine Science, 67: 000–000.

Stalked barnacle (Pollicipes pollicipes) exploitation at the Berlengas Nature Reserve, Portugal, by professional harvesters has been subject to specific regulation since 2000. The only available information on barnacle exploitation there comes from catch reports (logbooks) provided by the harvesters. We evaluated the quality of the logbook information, described the temporal patterns of P. pollicipes fishing effort from 2000 to 2006 based on the logbook data, and modelled the daily fishing effort in relation to variability in oceanographic conditions. Results suggest different levels of reliability for the information contained in the logbooks: (i) information on the date of harvest seems to be reliable because 83% of the observed harvest dates were also declared; (ii) information on the quantity harvested shows a large discrepancy (mean = 31.8%) between declared and observed amounts, but we believe it can be used to analyse temporal patterns of exploitation, because there was no systematic bias (under- and overreporting was to the same extent). The total quantity of barnacles harvested between 2000 and 2006 (~16 t year–1) was closely related to the effort applied. Daily harvesting effort was considered a function of two predictive variables (significant wave height and tidal range) and of their interaction. Neither the harvesting activity nor the resource itself seems to be at risk of collapse if such levels of pressure are maintained, but efforts should be made to increase surveillance and monitoring within the marine protected area.

Keywords: Berlengas, fishery, harvesting, marine reserve, Pollicipes, Portugal, stalked barnacle

Received 24 March 2009; accepted 27 July 2009.


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