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ICES Journal of Marine Science: Journal du Conseil 2004 61(1):148-154; doi:10.1016/j.icesjms.2003.07.001
© 2004 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Seabird distribution on the Humboldt Current in northern Chile in relation to hydrography, productivity, and fisheries

Tanja Weichlera,*, Stefan Garthea, Guillermo Luna-Jorquerab and Julio Moragab

a Forschungs- und Technologiezentrum Westküste Hafentörn, D-25761 Büsum, Germany
b Departamento de Biología Marina, Universidad Católica del Norte Larrondo 1281, Coquimbo, Chile

*Correspondence to T. Weichler; fax: +49 (0)4834 604 199. e-mail: weichler{at}ftz-west.uni-kiel.de.

Factors affecting seabird distribution in the Humboldt Current upwelling system in northern Chile were studied in January 1999 using ship transect counts. Of 24 species recorded, the Peruvian booby (Sula variegata), the kelp gull (Larus dominicanus) and the Humboldt penguin (Spheniscus humboldti) were the most abundant. Species composition varied among different areas of the system and distribution patterns differed substantially among eight of the more abundant species. Most species showed links to variation in environmental factors (trawler distribution, SST and chlorophyll concentration). Principal component analysis identified a feeding-flock factor as the most important one for explaining observed distribution patterns. One-third of all birds recorded were associated in feeding flocks and 3% of all individuals were directly attending fishing vessels.

Keywords: Chile, distribution, feeding flock, fisheries, hydrography, seabirds, upwelling

Received 3 December 2002; accepted 11 July 2003.


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