Reproductive Energetics and Female Attendance Patterns of Cape Fur Seals (Arctocephalus pusillus pusillus) During Early Lactation

Gamel, Christopher M.; Davis, Randall W.; David, J. H. M.; Meÿer, Michael A.; Brandon, E.A.A.

doi:10.1674/0003-0031(2005)153[0152:reafap]2.0.co;2

Cited by 29 publications

(20 citation statements)

References 29 publications

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“…Measures of foraging trip and shore visit duration were within the ranges of previous observations for Cape fur seals (Gamel and Davis 2005) and other fur seals (Arnould and Hindell 2001, Robson et al 2004, Staniland et al 2004, Page et al 2006. The distribution of locations for the tagged seals was generally confined to the shelf and shelf break, between the Lüderitz upwelling cell in the south and the Angola-Benguela Front in the north (Figures 1, 2).…”

Section: Geographic Patterns In Cape Fur Seal Foraging Behavioursupporting

confidence: 78%

Do inter-colony differences in Cape fur seal foraging behaviour reflect large-scale changes in the northern Benguela ecosystem?

Skern‐Mauritzen¹,

Kirkman²,

Olsen³

et al. 2009

African Journal of Marine Science

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Section: Geographic Patterns In Cape Fur Seal Foraging Behavioursupporting

confidence: 78%

Do inter-colony differences in Cape fur seal foraging behaviour reflect large-scale changes in the northern Benguela ecosystem?

Skern‐Mauritzen¹,

Kirkman²,

Olsen³

et al. 2009

African Journal of Marine Science

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“…, Gamel et al . ). Departing fur seals gather at the launch pad to the south of the island and typically leave in medium (median = 8 ± 1.359) groups.…”

Section: Discussionmentioning

confidence: 99%

Behavior of Cape fur seals (Arctocephalus pusillus pusillus) in response to spatial variation in white shark (Carcharodon carcharias) predation risk

Vos

O’Riain

Meÿer³

et al. 2015

Marine Mammal Science

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Foraging and predation risk are often separated at rookeries of marine central place foragers, thus offering an opportunity to gain insight into how predator‐avoidance shapes the behavior of prey. Here we compare the behavior of Cape fur seals (Arctocephalus pusillus pusillus) at two island rookeries with and without white shark (Carcharodon carcharias) predations, and assess seal behavior in relation to marked spatiotemporal variation in risk at the high‐risk site (Seal Island, South Africa). Our results show that seal behavior at the two sites is comparatively similar in summer, when predation risk is low at both sites, but not in winter. Compared to seals at the “low‐risk” site, seals at Seal Island avoided deep‐water habitat around the island at high risk times and restricted their use of this habitat in favor of safe, shallow waters when engaging in social and thermoregulatory behaviors. Seals increased their frequency of jostling, porpoising, and diving when moving through the danger zone and seals in groups were safer than single individuals. Overall, our results suggest that seal behavior around the high‐risk site is strongly affected by predation risk, and show this rookery to be an excellent predator‐prey system at which to evaluate long‐standing ecological hypotheses.

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“…A lactating mother's trip duration is determined by the time taken to regain the energy lost during suckling and travelling (Costa et al, 1989). Gamel et al (2005) found that trip lengths of lactating Cape fur seal females increased during the first four months of lactation. It is unknown whether increases in foraging trip lengths are caused by reduced local prey availability, or increasing independence on the part of the pups.…”

Section: Introductionmentioning

confidence: 99%

A refined fish consumption model for lactating Cape fur seals (Arctocephalus pusillus pusillus), based on scat analyses

Mecenero

Kirkman

Roux³

2006

ICES Journal of Marine Science

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Mecenero, S., Kirkman, S. P., and Roux, J-P. 2006. A refined fish consumption model for lactating Cape fur seals (Arctocephalus pusillus pusillus), based on scat analyses. e ICES Journal of Marine Science, 63: 1551e1566.A refined fish consumption model for lactating Cape fur seals in Namibia during the eightmonth lactation period, which allows for spatio-temporal variation in the diet as determined by scat analyses, has been developed. Previous estimates of prey consumption by Cape fur seals have been based mostly on coarse diet composition models. Sensitivity analyses showed that the energetic requirement and mass of lactating females (bioenergetic variables), as well as the energetic density of prey (diet variable), contributed most to the uncertainty in consumption estimates. Uncertainty in the remaining input variables had minimal effects on the estimates of food consumption. The consumption of commercial prey (horse mackerel, hake and pelagic fish) was greatest by the colony at Cape Cross. The model estimated that a female of average mass 55 kg ingested, on average, 11% of her body mass per day. This model is easily applied to other age/sex classes of the seal population. It permits improvement of the estimates of prey consumption by seals, which are useful for assessing levels of competitive interactions between seals and fisheries or other predators, or the impacts of seals on prey species.

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Reproductive Energetics and Female Attendance Patterns of Cape Fur Seals (Arctocephalus pusillus pusillus) During Early Lactation

Cited by 29 publications

References 29 publications

Do inter-colony differences in Cape fur seal foraging behaviour reflect large-scale changes in the northern Benguela ecosystem?

Do inter-colony differences in Cape fur seal foraging behaviour reflect large-scale changes in the northern Benguela ecosystem?

Behavior of Cape fur seals (Arctocephalus pusillus pusillus) in response to spatial variation in white shark (Carcharodon carcharias) predation risk

A refined fish consumption model for lactating Cape fur seals (Arctocephalus pusillus pusillus), based on scat analyses

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