Foraging behaviour and diet of lactating female southern sea lions (Otaria flavescens) in the Falkland Islands

Thompson, David; Duck, Callan; McConnell, Bernie; Garrett, James W.

doi:10.1017/s0952836998010024

Cited by 39 publications

(72 citation statements)

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“…However, SIAR indicates that after parturition lactating South American sea lion females consume large amounts of small benthic species such as O. tehuelchus and R. brasiliensis instead of larger species such as E. megalocyathus and P. isosceles. The same is true in the Falkland (Malvinas) Islands, where lactating South American sea lion females consume primarily small inshore benthic notothenid fish of unknown energy density (Thompson et al, 1998).…”

Section: Discussionmentioning

confidence: 80%

“…The South American sea lion (Otaria flavescens) exploits an ample range of coastal and off-shore prey in the southwestern Atlantic, foraging close to both the sea bed and the surface of the water column (Werner and Campagna, 1995;Thompson et al, 1998;Koen Alonso et al, 2000;Campagna et al, 2001). Stable isotope analysis has revealed that off northern Patagonia adult females consume more pelagic prey than adult males throughout the year (Drago et al, 2009a).…”

Section: Introductionmentioning

confidence: 99%

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Change in the foraging strategy of female South American sea lions (Carnivora: Pinnipedia) after parturition

Drago¹,

Cardona²,

Crespo³

et al. 2010

Sci. Mar.

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SUMMARY: This study tests the hypothesis that female South American sea lions shift from off-shore, pelagic prey to coastal, benthic prey after parturition in order to reduce the foraging trip duration and hence the time pups remain unattended on the beach during early lactation. The δ 13 C and δ 15 N values of the serum and blood cells of 26 South American sea lion suckling pups from northern Patagonia were used to track the dietary changes of their mothers from late pregnancy to early lactation, after correction for differential isotopic fractionation between tissues. Primary producers and potential prey species were also analysed to establish a baseline for interpreting the stable isotope concentration of serum and blood cells. Isotopic ratios revealed a generalized increase in the consumption of coastal-benthic prey after parturition. Such a generalized postpartum shift will allow females to spend more time on land and look after their pups. The effects of this foraging strategy on the nutritional quality of the female's diet are discussed.Keywords: South American sea lion, diet, feeding strategy, suckling pup, lactating females, Otaria flavescens, stable isotopes, Bayesian mixing models. RESUMEN: Cambio en la estrategia de alimentación de las hembras del león marino sudamericano (Carnivora: Pinnipedia) tras el parto. -El presente estudio pretende comprobar si las hembras del león marino sudamericano adoptan una dieta más bentónica y costera tras el parto, con el fin de reducir la duración de los viajes de alimentación y reducir así el tiempo durante el cual las crías permanecen desatendidas en la playa. Para ello, se determinaron las concentraciones de isótopos estables de carbono y nitrógeno en el suero y las células sanguíneas de 26 crías lactantes de león marino sudamericano del norte de la Patagonia, con el fin de reconstruir la dieta de la madre durante la parte final de la gestación y el inicio de la lactancia, tras la correspondiente corrección del fraccionamiento isotópico entre tejidos. También se analizaron muestras de productores primarios y de presas potenciales para ayudar en la interpretación de los resultados. Las concentraciones de isótopos estables antes y después del parto confirmaron un incremento en el consumo de presas bentónicas costeras tras el parto. Este cambio generalizado de dieta tras el parto permitiría a las hembras incrementar el tiempo que pasan junto a las crías. Se discuten los efectos que esta estrategia puede tener sobre la calidad de la dieta de las hembras.Palabras clave: león marino sudamericano, dieta, estrategias tróficas, lactancia, Otaria flavescens, isótopos estables, modelos de mezcla bayesianos.

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Section: Discussionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Change in the foraging strategy of female South American sea lions (Carnivora: Pinnipedia) after parturition

Drago¹,

Cardona²,

Crespo³

et al. 2010

Sci. Mar.

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“…When killer whales were present, the sea lions stayed close to the hull of the vessel after net retrieval. In the presence of killer whales, sea lions swam alongside the moving vessel, "porpoising" close to the vessel's hull as other pelagic otariids do when travelling (Thompson et al, 1998). When they could keep up with the speed of the vessel no longer, groups of sea lions swam away from the killer whales.…”

Section: Resultsmentioning

confidence: 99%

Behaviour of Southern sea lions in presence of killer whales during fishing operations in Central Chile

Hückstädt¹,

Antezana²

2004

Sci. Mar.

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oportunistas que habita diversos ecosistemas de todo el mundo y cuya dieta varía en forma local y estacional, lo que se refleja en la diversidad de comportamientos alimentarios asociados con sus presas. En este trabajo, reportamos la presencia de orcas presumiblemente cazando lobos marinos comunes del sur, en asociación con la flota pesquera de jurel en Chile Central. Se registró la presencia de orcas en cuatro lances de pesca. Todos los avistamientos fueron de grupos compuestos por 3-5 individuos, hembras y crías. Si bien la presencia de orcas no afectó significativamente el número de lobos marinos, si tuvo un efecto en el comportamiento de los lobos marinos reduciendo el número de conductas, cesando las actividades de alimentación y descanso y permaneciendo cercanos al casco del barco pesquero hasta después de finalizada la recuperación de la red. Se propone que las orcas podrían estar utilizando la pesquería como una fuente indirecta de presas, beneficiándose así de la agregación de lobos marinos alrededor del barco pesquero, lejos de tierra.Palabras clave: Orcinus orca, orca, Otaria flavescens, lobo marino común del sur, pesquería de cerco, Chile central.

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“…References! Galapagos fur seal ); Antarctic fur seal (Costa et al 2001); South American fur seal ); subantarctic fur seal (Geprges et al 2000b); cape fur seal ); Au'stralian fur seal (Arnauld and Hindell 2001); Galapagos sea lion ); Australian sea lion (Costa and Gales 2003); California sea lion (Feldkamp et al 1989); New Zealand sea lion (Costa and Gales 2000); Southern sea lion (Thompson et al 1998). ' feeds exclusively within Bass Strait between the Australian mainland and Tasmania, an area considered nutrient-poor with low marine productivity (Warneke and Shaughnessy 1985), Similarly, California sea lions on the California coast are epipelagic foragers in the cold productive waters of the California Current (Feldkamp et al 1989(Feldkamp et al , 1991, whereas the continental shelf habitat of the benthic foraging Galapagos sea lion is of generally low~r productivity (Farina et al 2003, Okey et al 2004.…”

Section: Discussionmentioning

confidence: 99%

“…Since the development in the mid-19 70s of electronic time-depth recorders (TORs) for measuring diving activity and satellite-telemetry methods for monitoring the at-sea movements of animals, there have been numerous studies investigating the foraging behavior of lactating otariid seals (e,g., Francis et al 1998; Thompson et al 1998;Costa andGales 2000, 2003). There are nine species of fur seals (plus one subspecies) and five species of sea lions (plus one subspecies) (Reijnders et al 1993) and these studies have revealed two broadly divergent patterns for the two groups.…”

Section: Introductionmentioning

confidence: 99%

Sea lions in drag, fur seals incognito: Insights from the otariid deviants

Arnould¹,

Costa²

2006

Sea Lions of the World

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Foraging behaviour and diet of lactating female southern sea lions (Otaria flavescens) in the Falkland Islands

Cited by 39 publications

References 0 publications

Change in the foraging strategy of female South American sea lions (Carnivora: Pinnipedia) after parturition

Change in the foraging strategy of female South American sea lions (Carnivora: Pinnipedia) after parturition

Behaviour of Southern sea lions in presence of killer whales during fishing operations in Central Chile

Sea lions in drag, fur seals incognito: Insights from the otariid deviants

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