Foraging Behaviour of Antarctic Fur Seals During Periods of Contrasting Prey Abundance

Boyd, I. L.; Arnould, John P. Y.; Barton, Tim R.; Croxall, J. P.

doi:10.2307/5235

Cited by 233 publications

(211 citation statements)

References 18 publications

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“…While this finding may not generalize to species with strong diel patterns in feeding and behavior (Boyd et al, 1994;Horning and Trillmich, 1999;McIntyre et al, 2011;Watanabe et al, 2004), it suggests caution in inferring diel patterns from captive animals.…”

Section: Discussionmentioning

confidence: 78%

Variation in adrenal and thyroid hormones with life-history stage in juvenile northern elephant seals (Mirounga angustirostris)

Jelincic

Tift

Houser

et al. 2017

General and Comparative Endocrinology

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Section: Discussionmentioning

confidence: 78%

Variation in adrenal and thyroid hormones with life-history stage in juvenile northern elephant seals (Mirounga angustirostris)

Jelincic

Tift

Houser

et al. 2017

General and Comparative Endocrinology

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“…As a consequence, New Zealand sea lions are very likely to be susceptible to fluctuations of food resources as caused by El Niñ o/La Niñ a events or other climatic fluctuations. The effect of these events has not been investigated in New Zealand sea lion, but foraging patterns of other marine species that share the same latitudes have been studied in parallel with El Niñ o (low prey abundance) and La Niñ a (high prey abundance) events (Boyd et al, 1994;Peacock et al, 2000;Bowen et al, 2001;Soto et al, 2004). Availability of prey in the equatorial Pacific region varies considerably with the El Niñ o-Southern Oscillation (ENSO) (Barber and Chavez, 1983;Glynn, 1988).…”

Section: Discussionmentioning

confidence: 99%

“…Availability of prey in the equatorial Pacific region varies considerably with the El Niñ o-Southern Oscillation (ENSO) (Barber and Chavez, 1983;Glynn, 1988). Periods of low prey abundance have led the lactating females of some otariid species to extend the duration of their foraging trips with increased activity and energy expenditure (Cape fur seals, Arctocephalus pusillus pusillus: Bowen et al, 2001; Antarctic fur seals: Boyd et al, 1994). When female Cape fur seals cannot cope with extreme physiological conditions, they abandon their pup (Bowen et al, 2001).…”

Section: Discussionmentioning

confidence: 99%

Neonatal Mortality in New Zealand Sea Lions (Phocarctos Hookeri ) at Sandy Bay, Enderby Island, Auckland Islands From 1998 to 2005

Castinel

Duignan

Pomroy

et al. 2007

Journal of Wildlife Diseases

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ABSTRACT:As part of a health survey of New Zealand sea lions (Phocarctos hookeri) on Enderby Island, Auckland Islands (50u309S, 166u179E), neonatal mortality was closely monitored at the Sandy Bay colony for seven consecutive years. Throughout the breeding seasons 1998-99 to 2004-05, more than 400 postmortem examinations were performed on pups found dead at this site. The primary causes of death were categorized as trauma (35%), bacterial infections (24%), hookworm infection (13%), starvation (13%), and stillbirth (4%). For most pups, more than one diagnosis was recorded. Every year, two distinct peaks of trauma were observed: the first associated with mature bulls fighting within the harem and the second with subadult males abducting pups. In 2001-02 and 2002-03, epidemics caused by Klebsiella pneumoniae increased mortality by three times the mean in nonepidemic years (10.2%). The increased mortality was attributed directly to acute suppurative infection due to the bacterium and also to an increase in traumatic deaths of debilitated pups. Parasitic infection with the hookworm Uncinaria spp. was a common finding in all pups older than three weeks of age and debilitation by the parasite may have contributed to increased susceptibility to other pathogens such as Klebsiella sp. or Salmonella sp. This study provides valuable quantitative data on the natural causes of neonatal mortality in New Zealand sea lions that can be used in demographic models for management of threatened species.

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“…To standardize among years, dive data were subsampled to data collected at 4-s intervals. Dive bouts, which are periods of intensive diving activity, were identified using a custom R script (R. Beltran), which is a modification of the method described in Boyd et al (1994). The minimum criterion for a bout was five dives with a maximum surface interval of 10 min or less between dives.…”

Section: Data Processingmentioning

confidence: 99%

Foraging strategies of a generalist marine predator inhabiting a dynamic environment

et al. 2016

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reflect changes in prey availability. Deep-diving sea lions traveled shorter distances and spent a greater proportion of time at the rookery than sea lions using the other two strategies, which may have energetic and reproductive implications. These results highlight the importance of an individual-based approach in describing the foraging behavior of female California sea lions and understanding how they respond to the seasonal and annual changes in prey availability that characterize the California Current System.

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Foraging Behaviour of Antarctic Fur Seals During Periods of Contrasting Prey Abundance

Cited by 233 publications

References 18 publications

Variation in adrenal and thyroid hormones with life-history stage in juvenile northern elephant seals (Mirounga angustirostris)

Variation in adrenal and thyroid hormones with life-history stage in juvenile northern elephant seals (Mirounga angustirostris)

Neonatal Mortality in New Zealand Sea Lions (Phocarctos Hookeri ) at Sandy Bay, Enderby Island, Auckland Islands From 1998 to 2005

Foraging strategies of a generalist marine predator inhabiting a dynamic environment

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