Distribution and abundance of the South American sea lion Otaria flavescens (Carnivora: Otariidae) along the central coast off Chile

The onshore distribution and abundance of the South American sea lion Otaria flavescens along the central Chilean coast was estimated during the period January-February 2007. Additionally, changes in population abundance during the period 1970-2007 were examined. Population surveys were based on pho...

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Autores principales:	SEPÚLVEDA,MARITZA, OLIVA,DORIS, URRA,ALEJANDRA, PÉREZ-ÁLVAREZ,MARÍA J, MORAGA,RODRIGO, SCHRADER,DANIEL, INOSTROZA,PATRICIA, MELO,ANGELA, DÍAZ,HUMBERTO, SIELFELD,WALTER
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2011
Materias:	census Chilean coast Otaria flavescens overexploitation sea lions
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000100007
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spelling	oai:scielo:S0716-078X20110001000072011-06-24Distribution and abundance of the South American sea lion Otaria flavescens (Carnivora: Otariidae) along the central coast off ChileSEPÚLVEDA,MARITZAOLIVA,DORISURRA,ALEJANDRAPÉREZ-ÁLVAREZ,MARÍA JMORAGA,RODRIGOSCHRADER,DANIELINOSTROZA,PATRICIAMELO,ANGELADÍAZ,HUMBERTOSIELFELD,WALTER census Chilean coast Otaria flavescens overexploitation sea lions The onshore distribution and abundance of the South American sea lion Otaria flavescens along the central Chilean coast was estimated during the period January-February 2007. Additionally, changes in population abundance during the period 1970-2007 were examined. Population surveys were based on photographs taken from boats or aircraft. A total of 16301 sea lions (CI = 16209-16375) were counted in 33 colonies (6 breeding and 27 non-breeding sites). After correction to account for the proportion of individuals at sea and for pups not seen at the time of the survey, the mean estimated abundance was 18179 (95 % CI = 17777-18851) sea lions. Population trend analysis showed that from 1970 to 1985, South American sea lions showed a positive increase of approximately 2.1 % yr-1. Nevertheless, between 1985 and 1997 and between 1997 and 2007, the estimated number of sea lions showed a stable or slightly negative trend of 0.4 ± 0.1 % yr-1and 0.5 ± 0.1 % yr-1, respectively. We suggest that the overexploitation and decline of the principal fisheries in Central Chile could adversely impact the abundance and distribution of the South American sea lion in the study area.info:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.84 n.1 20112011-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000100007en10.4067/S0716-078X2011000100007
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	census Chilean coast Otaria flavescens overexploitation sea lions
spellingShingle	census Chilean coast Otaria flavescens overexploitation sea lions SEPÚLVEDA,MARITZA OLIVA,DORIS URRA,ALEJANDRA PÉREZ-ÁLVAREZ,MARÍA J MORAGA,RODRIGO SCHRADER,DANIEL INOSTROZA,PATRICIA MELO,ANGELA DÍAZ,HUMBERTO SIELFELD,WALTER Distribution and abundance of the South American sea lion Otaria flavescens (Carnivora: Otariidae) along the central coast off Chile
description	The onshore distribution and abundance of the South American sea lion Otaria flavescens along the central Chilean coast was estimated during the period January-February 2007. Additionally, changes in population abundance during the period 1970-2007 were examined. Population surveys were based on photographs taken from boats or aircraft. A total of 16301 sea lions (CI = 16209-16375) were counted in 33 colonies (6 breeding and 27 non-breeding sites). After correction to account for the proportion of individuals at sea and for pups not seen at the time of the survey, the mean estimated abundance was 18179 (95 % CI = 17777-18851) sea lions. Population trend analysis showed that from 1970 to 1985, South American sea lions showed a positive increase of approximately 2.1 % yr-1. Nevertheless, between 1985 and 1997 and between 1997 and 2007, the estimated number of sea lions showed a stable or slightly negative trend of 0.4 ± 0.1 % yr-1and 0.5 ± 0.1 % yr-1, respectively. We suggest that the overexploitation and decline of the principal fisheries in Central Chile could adversely impact the abundance and distribution of the South American sea lion in the study area.
author	SEPÚLVEDA,MARITZA OLIVA,DORIS URRA,ALEJANDRA PÉREZ-ÁLVAREZ,MARÍA J MORAGA,RODRIGO SCHRADER,DANIEL INOSTROZA,PATRICIA MELO,ANGELA DÍAZ,HUMBERTO SIELFELD,WALTER
author_facet	SEPÚLVEDA,MARITZA OLIVA,DORIS URRA,ALEJANDRA PÉREZ-ÁLVAREZ,MARÍA J MORAGA,RODRIGO SCHRADER,DANIEL INOSTROZA,PATRICIA MELO,ANGELA DÍAZ,HUMBERTO SIELFELD,WALTER
author_sort	SEPÚLVEDA,MARITZA
title	Distribution and abundance of the South American sea lion Otaria flavescens (Carnivora: Otariidae) along the central coast off Chile
title_short	Distribution and abundance of the South American sea lion Otaria flavescens (Carnivora: Otariidae) along the central coast off Chile
title_full	Distribution and abundance of the South American sea lion Otaria flavescens (Carnivora: Otariidae) along the central coast off Chile
title_fullStr	Distribution and abundance of the South American sea lion Otaria flavescens (Carnivora: Otariidae) along the central coast off Chile
title_full_unstemmed	Distribution and abundance of the South American sea lion Otaria flavescens (Carnivora: Otariidae) along the central coast off Chile
title_sort	distribution and abundance of the south american sea lion otaria flavescens (carnivora: otariidae) along the central coast off chile
publisher	Sociedad de Biología de Chile
publishDate	2011
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000100007
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Distribution and abundance of the South American sea lion Otaria flavescens (Carnivora: Otariidae) along the central coast off Chile

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