Changes in dive profiles as an indicator of feeding success in king and Adélie penguins

Bost, Charles‐André; Handrich, Yves; Butler, P. J.; Fahlman, Andreas; Halsey, LG; Woakes, A. J.; Ropert‐Coudert, Yan

doi:10.1016/j.dsr2.2006.11.007

Cited by 105 publications

(98 citation statements)

References 23 publications

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“…Wiggles were defined as dive events when birds changed their swimming direction rapidly from descending to ascending to descending (Takahashi et al 2004). This has been previously shown as a reliable proxy for prey capture during foraging events and correlates positively with bill openings and closings (Ropert-Coudert et al 2001;Simeone and Wilson 2003;Takahashi et al 2004;Bost et al 2007). Because of surface noise, we used a conservative approach and analyzed dives 110 m in depth, which is the suggested depth threshold for foraging dives of macaroni penguins at Bird Island, South Georgia (Green et al 2005).…”

Section: Tdr Data Analysismentioning

confidence: 99%

Corticosterone Predicts Foraging Behavior and Parental Care in Macaroni Penguins

Crossin

Trathan

Phillips

et al. 2012

The American Naturalist

146

126

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Dryad data: http://dx.doi.org/10.5061/dryad.f385721n.abstract: Corticosterone has received considerable attention as the principal hormonal mediator of allostasis or physiological stress in wild animals. More recently, it has also been implicated in the regulation of parental care in breeding birds, particularly with respect to individual variation in foraging behavior and provisioning effort. There is also evidence that prolactin can work either inversely or additively with corticosterone to achieve this. Here we test the hypothesis that endogenous corticosterone plays a key physiological role in the control of foraging behavior and parental care, using a combination of exogenous corticosterone treatment, time-depth telemetry, and physiological sampling of female macaroni penguins (Eudyptes chrysolophus) during the brood-guard period of chick rearing, while simultaneously monitoring patterns of prolactin secretion. Plasma corticosterone levels were significantly higher in females given exogenous implants relative to those receiving sham implants. Increased corticosterone levels were associated with significantly higher levels of foraging and diving activity and greater mass gain in implanted females. Elevated plasma corticosterone was also associated with an apparent fitness benefit in the form of increased chick mass. Plasma prolactin levels did not correlate with corticosterone levels at any time, nor was prolactin correlated with any measure of foraging behavior or parental care. Our results provide support for the corticosterone-adaptation hypothesis, which predicts that higher corticosterone levels support increased foraging activity and parental effort.

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Section: Tdr Data Analysismentioning

confidence: 99%

Corticosterone Predicts Foraging Behavior and Parental Care in Macaroni Penguins

Crossin

Trathan

Phillips

et al. 2012

The American Naturalist

146

126

View full text Add to dashboard Cite

show abstract

“…For example, Bost et al (2007) noted that king Aptenodytes patagonicus and Adélie penguins catch prey during the ascent phases of undulations and Ropert-Coudert et al (2001a) report that the general tendency of Adélie penguins to take prey from below can be explained by the birds benefiting from the backlighting of the water surface, against which the prey are presumed to be silhouetted. This seems reason enough to take prey from underneath.…”

Section: Prey Capturementioning

confidence: 99%

Pedalling downhill and freewheeling up; a penguin perspective on foraging

Wilson¹,

Shepard²,

Laich³

et al. 2010

Aquat. Biol.

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Depth-dependent buoyancy resulting from the compression of body-associated air is a major force modulating energy expenditure in diving seabirds, yet quantification of its effects in freeliving animals is problematic. Between November 2006 and December 2008, we used multiple channel loggers (daily diaries [DDs]); recording triaxial acceleration, depth and speed, during foraging of 34 Magellanic penguins Spheniscus magellanicus from 3 colonies in Argentina to derive a new proxy for energy expenditure, overall dynamic body acceleration (ODBA). Assuming ODBA to be linearly related to power, energy expenditure was highest during dive descent, nearer the surface and in those dives terminating at greater depths due to steeper descent angles. Swim speed during descent was invariant of maximum dive depth. Calculated energy expenditure during the bottom phase of the dive was invariant of depth, but energy expenditure of birds returning to the surface was lowest at any given depth for birds that had engaged in deeper dives due to the effects of buoyancy. Four birds, equipped with beak angle-measuring sensors as part of the DDs, captured 89% of their prey (normally pelagic school fish) during fast passive ascents using buoyancy to aid in capture. Details from one of these birds showed that this passive ascent occurred at a mean velocity of 1.94 m s -1 for a mean of 2.02 s; ascent angles during such rushes were steeper when the bird was deeper, which was presumed to reflect a response to the diminished buoyant force at greater pressures. Passive ascents during prey capture appear to be an important mechanism for Magellanic penguins to capture fastmoving prey with minimal energy expenditure.

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“…The bottom phase, during which penguins are most likely to hunt (Chappell et al 1993;Wilson et al 1995) and appear to capture most of their prey (Takahashi et al 2004;Ropert-Coudert et al 2006;Bost et al 2007), was defined by three conditions; it could only occur (1) at depths[85% of the maximum depth of the dive (cf. Kirkwood and Robertson 1997b), (2) if it was bounded by two points of inflection in the rate of change of depth and (3) if the overall rate of change of depth for the whole of the putative bottom period did not exceed 0.2 ms -1 (Rodary et al 2000a).…”

Section: Depth Analysismentioning

confidence: 99%

Foraging movements of emperor penguins at Pointe Géologie, Antarctica

et al. 2007

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The foraging distributions of 20 breeding emperor penguins were investigated at Pointe Géologie, Terre Adélie, Antarctica by using satellite telemetry in 2005 and 2006 during early and late winter, as well as during late spring and summer, corresponding to incubation, early chick-brooding, late chick-rearing and the adult pre-moult period, respectively. Dive depth records of three post-egg-laying females, two post-incubating males and four late chick-rearing adults were examined, as well as the horizontal space use by these birds. Foraging ranges of chick-provisioning penguins extended over the Antarctic shelf and were constricted by winter pack-ice. During spring ice break-up, the foraging ranges rarely exceeded the shelf slope, although seawater access was apparently almost unlimited. Winter females appeared constrained in their access to open water but used fissures in the sea ice and expanded their prey search effort by expanding the horizontal search component underwater. Birds in spring however, showed higher area-restricted-search than did birds in winter. Despite different seasonal foraging strategies, chick-rearing penguins exploited similar areas as indicated by both a high 'Area-Restricted-Search Index' and high 'Catch Per Unit Effort'. During pre-moult trips, emperor penguins ranged much farther offshore than breeding birds, which argues for particularly profitable oceanic feeding areas which can be exploited when the time constraints imposed by having to return to a central place to provision the chick no longer apply.

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Changes in dive profiles as an indicator of feeding success in king and Adélie penguins

Cited by 105 publications

References 23 publications

Corticosterone Predicts Foraging Behavior and Parental Care in Macaroni Penguins

Corticosterone Predicts Foraging Behavior and Parental Care in Macaroni Penguins

Pedalling downhill and freewheeling up; a penguin perspective on foraging

Foraging movements of emperor penguins at Pointe Géologie, Antarctica

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