Analysis of the re-colonization of San Benito Archipelago by Guadalupe fur seals (Arctocephalus townsendi)

Exploitation of the Guadalupe fur seal (GFS) during the XVIII and XIX centuries almost extirpated the species. GFS were distributed from the Revillagigedo islands (Mexico) to the gulf of Farallones (USA). At present, reproductive colonies are found at Guadalupe Island and San Benito Archipelago (SBA...

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Autores principales:	Esperón-Rodríguez,Manuel, Gallo-Reynoso,Juan Pablo
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2012
Materias:	Arctocephalus townsendi San Benito Archipelago re-colonization population size and trend reproductive biology feeding behavior Mexico
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2012000100020
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spelling	oai:scielo:S0718-560X20120001000202012-05-16Analysis of the re-colonization of San Benito Archipelago by Guadalupe fur seals (Arctocephalus townsendi)Esperón-Rodríguez,ManuelGallo-Reynoso,Juan Pablo Arctocephalus townsendi San Benito Archipelago re-colonization population size and trend reproductive biology feeding behavior Mexico Exploitation of the Guadalupe fur seal (GFS) during the XVIII and XIX centuries almost extirpated the species. GFS were distributed from the Revillagigedo islands (Mexico) to the gulf of Farallones (USA). At present, reproductive colonies are found at Guadalupe Island and San Benito Archipelago (SBA). The aim of this work was to analyze the process of re-colonization and the current status of GFS at SBA. The first births and the occupation of the west island of the SBA are also reported. Census data from 1997 to 2007 indicated an annual growth rate for the population of 21.6%. The population size, growth tendency of the colony, reproductive biology, and food preferences were also studied. A total of 2,227 GFS were counted at SBA. Three squid species (Loligo opalescens, Onychoteuthis banksii, Dosidicus gigas) were found to be the main dietary components. Territoriality, activity patterns, and reproductive behavior were similar for the seals from Guadalupe Island and SBA. The mean growth rate for pups from SBA was calculated and compared to that of the pups at Guadalupe Island (SBA: 6.7 ± 1.4 kg, 68.9 ± 2.64 cm; Guadalupe Island: 5.9 ± 0.5 kg, 67.29 ± 4.3 cm). The length of food foraging trips by females was measured, suggesting that the SBA colony is probably near an important feeding area. Maternal care patterns could indicate different strategies of nursing-foraging trips between the SBA and Guadalupe Island. The population of fur seals at SBA is expected to increase as there are no limitations in terms of reproductive space or available food resources in the area.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.40 n.1 20122012-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2012000100020en
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Arctocephalus townsendi San Benito Archipelago re-colonization population size and trend reproductive biology feeding behavior Mexico
spellingShingle	Arctocephalus townsendi San Benito Archipelago re-colonization population size and trend reproductive biology feeding behavior Mexico Esperón-Rodríguez,Manuel Gallo-Reynoso,Juan Pablo Analysis of the re-colonization of San Benito Archipelago by Guadalupe fur seals (Arctocephalus townsendi)
description	Exploitation of the Guadalupe fur seal (GFS) during the XVIII and XIX centuries almost extirpated the species. GFS were distributed from the Revillagigedo islands (Mexico) to the gulf of Farallones (USA). At present, reproductive colonies are found at Guadalupe Island and San Benito Archipelago (SBA). The aim of this work was to analyze the process of re-colonization and the current status of GFS at SBA. The first births and the occupation of the west island of the SBA are also reported. Census data from 1997 to 2007 indicated an annual growth rate for the population of 21.6%. The population size, growth tendency of the colony, reproductive biology, and food preferences were also studied. A total of 2,227 GFS were counted at SBA. Three squid species (Loligo opalescens, Onychoteuthis banksii, Dosidicus gigas) were found to be the main dietary components. Territoriality, activity patterns, and reproductive behavior were similar for the seals from Guadalupe Island and SBA. The mean growth rate for pups from SBA was calculated and compared to that of the pups at Guadalupe Island (SBA: 6.7 ± 1.4 kg, 68.9 ± 2.64 cm; Guadalupe Island: 5.9 ± 0.5 kg, 67.29 ± 4.3 cm). The length of food foraging trips by females was measured, suggesting that the SBA colony is probably near an important feeding area. Maternal care patterns could indicate different strategies of nursing-foraging trips between the SBA and Guadalupe Island. The population of fur seals at SBA is expected to increase as there are no limitations in terms of reproductive space or available food resources in the area.
author	Esperón-Rodríguez,Manuel Gallo-Reynoso,Juan Pablo
author_facet	Esperón-Rodríguez,Manuel Gallo-Reynoso,Juan Pablo
author_sort	Esperón-Rodríguez,Manuel
title	Analysis of the re-colonization of San Benito Archipelago by Guadalupe fur seals (Arctocephalus townsendi)
title_short	Analysis of the re-colonization of San Benito Archipelago by Guadalupe fur seals (Arctocephalus townsendi)
title_full	Analysis of the re-colonization of San Benito Archipelago by Guadalupe fur seals (Arctocephalus townsendi)
title_fullStr	Analysis of the re-colonization of San Benito Archipelago by Guadalupe fur seals (Arctocephalus townsendi)
title_full_unstemmed	Analysis of the re-colonization of San Benito Archipelago by Guadalupe fur seals (Arctocephalus townsendi)
title_sort	analysis of the re-colonization of san benito archipelago by guadalupe fur seals (arctocephalus townsendi)
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2012
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2012000100020
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Analysis of the re-colonization of San Benito Archipelago by Guadalupe fur seals (Arctocephalus townsendi)

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