Do Adélie penguins modify their foraging behaviour in pursuit of different prey?

Ropert‐Coudert, Yan; Kato, Akiko; Bost, Charles‐André; Rodary, D.; Sato, Katsufumi; Maho, Yvon Le; Naito, Yoshiro

doi:10.1007/s00227-001-0719-z

Cited by 39 publications

(2 citation statements)

References 30 publications

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“…Because swimming and diving are necessary for prey capture by pinnipeds, characteristics of these behaviors can shed light on the foraging environment faced by the animal. Differences in diet and prey availability alter behavioral patterns in many air-breathing marine predators (Croxall et al 1988;Bost et al 2002;Bowen et al 2002;Harcourt et al 2002;Ropert-Coudert et al 2002;Watanabe et al 2003). Within a species, differences in diving patterns among individuals or age classes reflect relative foraging ability and (or) different foraging requirements.…”

Section: Introductionmentioning

confidence: 99%

Differences in diving and swimming behavior of pup and juvenile Steller sea lions (Eumetopias jubatus) in Alaska

Rehberg

Burns

2008

Can. J. Zool.

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Reduced juvenile survival caused by prey depletion is one hypothesis for the decline in the western Alaska population of Steller sea lions ( Eumetopias jubatus (Schreber, 1776)). To understand the exposure of young sea lions to these depletions, the swimming and diving behavior of pups, juveniles, and subadults was evaluated relative to prey behavior. Pups made shorter and shallower dives (13 m, 0.9 min) than juveniles or subadults, as expected based on physiological limitations, but juveniles and subadults dived to similar depths and durations (29 m, 1.7 min and 38 m, 2.0 min, respectively). Activity patterns of juveniles and subadults reflected diurnal prey migrations, while pup activity did not. Longitudinal trends in pup dive behavior reflected both physiological and behavioral development, while juvenile dive behaviors reflected seasonal changes in prey availability. Results suggest that adult females must continue to provide nutritional support to pups during winter because of the limited diving ability of these young animals. For this reason, the flexible lactation strategies that allow for longer nursing periods during periods of low prey availability and reduce female fecundity may improve juvenile survival.

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Section: Introductionmentioning

confidence: 99%

Differences in diving and swimming behavior of pup and juvenile Steller sea lions (Eumetopias jubatus) in Alaska

Rehberg

Burns

2008

Can. J. Zool.

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“…Benthic diving has been documented in several penguin species including Gentoo, Pygoscelis papua (Kokubun et al, 2010;Robinson & Hindell, 1996), Yellow-Eyed, Megadyptes antipodes (Mattern et al, 2007), Emperor, Aptenodytes forsteri (Rodary et al, 2000), Adelie, Pygoscelis adeliae (Ropert-Coudert et al, 2002), Chinstrap, Pygoscelis antarcticus (Takahashi et al, 2003) and macaroni penguins, Eudyptes chrysolophus (Tremblay & Cherel, 2000). However, no such diving behaviour has been previously reported for African penguins.…”

Section: Diving Behaviour and Foraging Successmentioning

confidence: 99%

Multi-predator assemblages, dive type, bathymetry and sex influence foraging success and efficiency in African penguins

Sutton

Pichegru

Botha

et al. 2020

PeerJ

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Marine predators adapt their hunting techniques to locate and capture prey in response to their surrounding environment. However, little is known about how certain strategies influence foraging success and efficiency. Due to the miniaturisation of animal tracking technologies, a single individual can be equipped with multiple data loggers to obtain multi-scale tracking information. With the addition of animal-borne video data loggers, it is possible to provide context-specific information for movement data obtained over the video recording periods. Through a combination of video data loggers, accelerometers, GPS and depth recorders, this study investigated the influence of habitat, sex and the presence of other predators on the foraging success and efficiency of the endangered African penguin, Spheniscus demersus, from two colonies in Algoa Bay, South Africa. Due to limitations in the battery life of video data loggers, a machine learning model was developed to detect prey captures across full foraging trips. The model was validated using prey capture signals detected in concurrently recording accelerometers and animal-borne cameras and was then applied to detect prey captures throughout the full foraging trip of each individual. Using GPS and bathymetry information to inform the position of dives, individuals were observed to perform both pelagic and benthic diving behaviour. Females were generally more successful on pelagic dives than males, suggesting a trade-off between manoeuvrability and physiological diving capacity. By contrast, males were more successful in benthic dives, at least for Bird Island (BI) birds, possibly due to their larger size compared to females, allowing them to exploit habitat deeper and for longer durations. Both males at BI and both sexes at St Croix (SC) exhibited similar benthic success rates. This may be due to the comparatively shallower seafloor around SC, which could increase the likelihood of females capturing prey on benthic dives. Observation of camera data indicated individuals regularly foraged with a range of other predators including penguins and other seabirds, predatory fish (sharks and tuna) and whales. The presence of other seabirds increased individual foraging success, while predatory fish reduced it, indicating competitive exclusion by larger heterospecifics. This study highlights novel benthic foraging strategies in African penguins and suggests that individuals could buffer the effects of changes to prey availability in response to climate change. Furthermore, although group foraging was prevalent in the present study, its influence on foraging success depends largely on the type of heterospecifics present.

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The Final Seconds: How Fish-Birds Catch Prey

Ainley,

Wilson

2023

Fascinating Life Sciences

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Do Adélie penguins modify their foraging behaviour in pursuit of different prey?

Cited by 39 publications

References 30 publications

Differences in diving and swimming behavior of pup and juvenile Steller sea lions (Eumetopias jubatus) in Alaska

Differences in diving and swimming behavior of pup and juvenile Steller sea lions (Eumetopias jubatus) in Alaska

Multi-predator assemblages, dive type, bathymetry and sex influence foraging success and efficiency in African penguins

The Final Seconds: How Fish-Birds Catch Prey

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