Artículo
Small-scale variation in the diet of the South American Sea lion (Otaria flavescens) in northern Patagonia (Argentina)
Jarma, Dayana Ayelen; Romero, Maria Alejandra
; García, Néstor A.; Svendsen, Guillermo
; González, Raul Alberto Candido
; Dans, Silvana Laura
; Crespo, Enrique Alberto
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Fecha de publicación:
04/2019
Editorial:
Elsevier B.V.
Revista:
Regional Studies in Marine Science
ISSN:
2352-4855
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
An understanding of the mechanisms that shape animal-population dynamics is a fundamental consideration in conservation biology and ecology. Populations of the species of South-American sea lions (SASLs) Otaria flavescens reveal different growth rates, which variations could be linked to changes in the accessibility of nutritional resources in any given location. The available information on differences in the SASL diet on a local scale, however, is relatively scarce. We therefore searched for evidence of geographical variations in the diet of the SASLs in Northern Patagonia—namely, in the Golfo San Matías (GSM) and the Golfo Nuevo (GN), both of which bays are quite different regarding their physiography, oceanography, and anthropic pressures. From 2005–2013, stomach samples ( nGSM = 39; nGN = 31) were collected from animals found dead on the coast or accidentally caught in fishing nets. The dietary composition differed between the two gulfs with respect to the most common species, the zoological groups, and the sizes of the primary prey. In the GSM, the SASLs fed on demersal–pelagic fish, while in the GN the diet exhibited a high contribution of benthic species. Differences in the items and sizes of prey consumed at each area are discussed in terms of differential prey availability along with the opportunistic feeding behavior of this predator. These differences, in addition to the species’s main prey as targets for major fisheries, must be taken into account in order to understand the different population dynamics of this apex predator and thus ensure its conservation.
Palabras clave:
FEEDING HABITS
,
STOMACH CONTENT
,
VARIATION IN DIET
,
SEA LION
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(CESIMAR)
Articulos de CENTRO PARA EL ESTUDIO DE SISTEMAS MARINOS
Articulos de CENTRO PARA EL ESTUDIO DE SISTEMAS MARINOS
Articulos(CIMAS)
Articulos de CENTRO DE INVESTIGACION APLICADA Y TRANSFERENCIA TECNOLOGICA EN RECURSOS MARINOS "ALMIRANTE STORNI"
Articulos de CENTRO DE INVESTIGACION APLICADA Y TRANSFERENCIA TECNOLOGICA EN RECURSOS MARINOS "ALMIRANTE STORNI"
Citación
Jarma, Dayana Ayelen; Romero, Maria Alejandra; García, Néstor A.; Svendsen, Guillermo; González, Raul Alberto Candido; et al.; Small-scale variation in the diet of the South American Sea lion (Otaria flavescens) in northern Patagonia (Argentina); Elsevier B.V.; Regional Studies in Marine Science; 28; 4-2019; 1-11
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