Effects of the 1997-1998 El Niño on population size and diet of the Galápagos sea lion (Zalophus wollebaeki)

Salazar P., S. and Bustamante, Rodrigo H. (2003) Effects of the 1997-1998 El Niño on population size and diet of the Galápagos sea lion (Zalophus wollebaeki). Noticias de Galapagos, 62, pp. 40-45.

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Abstract

The multi-annual climatic event, El Niño Southern Oscillation (ENSO) is an important factor in the population dynamics of coastal marine species in the Galápagos. The Galápagos sea lion, Zalophus wollebaeki, suffered an apparent population decline of about 50%, considering both mortality and movements away from study sites during the 1997-98 El Niño. This change was in part due to changes in the availability of sardines of the Family Clupeidae, its main prey. These declines resulted partly from elevated mortality (35%) in sea lion colonies, particularly among pups, juveniles (< 1 year old), and dominant males and as a result of movements of adults elsewhere (15%), presumably where there were alternative prey and better environmental conditions.

Item Type: Article
Title: Effects of the 1997-1998 El Niño on population size and diet of the Galápagos sea lion (Zalophus wollebaeki)
Personal Creator/Author:
CreatorsEmail
Salazar P., S.
Bustamante, Rodrigo H.
Journal or Publication Title: Noticias de Galapagos
Volume: 62
Page Range: pp. 40-45
Date: December 2003
ISSN: 0550-1067
Latitude: -0.384583
Longitude: -90.3968
Funders: United States Agency for International Development (USAID), David and Lucile Packard Foundation
Issuing Agency: Fundacion Charles Darwin Foundation
Uncontrolled Keywords: Galápagos sea lions;Zalophus wollebaeki;census;population size;juveniles;diet;prey;sardines;1997-1998 El Niño;El Niño Southern Oscillation;ENSO;Galápagos
Subjects: Biology
Conservation
Ecology
Oceanography
Item ID: 8590
Depositing User: Ms Sally Taylor
Date Deposited: 16 Apr 2012 19:50
Last Modified: 16 Apr 2012 19:50
Related URLs:
URI: http://aquaticcommons.org/id/eprint/8590

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