Adélie penguin foraging behaviour and krill abundance along the Wilkes and Adélie land coasts, Antarctica

Wienecke, Bárbara; Lawless, R.; Rodary, D.; Bost, Charles‐André; Thomson, Robin B.; Pauly, Tim; Robertson, Graham; Kerry, Knowles; LeMaho, Y

doi:10.1016/s0967-0645(00)00036-9

Cited by 51 publications

(44 citation statements)

References 9 publications

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“…Increasing foraging ranges as chick rearing progresses are reported for macaroni, royal and Adélie penguins at a number of locations , Watanuki et al 1999, Wienecke et al 2000, Barlow & Croxall 2002, Lynnes et al 2002, Kato et al 2003, Ainley et al 2004, including Béchervaise Island (this study) but apparently not at others (Lishman 1985, Trivelpiece et al 1987, Wienecke et al 2000. Ainley et al (2004) suggested that the foraging range expansion observed at Ross Island resulted from intraspecific competition and consequent effects on foraging effort.…”

Section: Partitioning Of Resources During Chick Rearing and Life Histmentioning

confidence: 47%

Environmental conditions and life history constraints determine foraging range in breeding Adélie penguins

Clarke¹,

Emmerson²,

Otáhal³

2006

Mar. Ecol. Prog. Ser.

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Foraging movements of Adélie penguins are constrained both by environmental conditions (e.g. sea ice cover) and life history factors (e.g. regular offspring provisioning). We describe within season changes in foraging range, trip duration and body condition of Adélie penguins nesting at Béchervaise Island, East Antarctica, in the context of these constraints. Penguins were satellite tracked over multiple seasons during the incubation, guard, crèche and pre-moult phases of their annual cycle. They ranged farthest during incubation when sea ice was extensive and shortest during the guard stage when chicks were small and sea ice limited in extent. Prior to their annual moult the birds foraged hundreds of kilometres to the west and east of their breeding sites. A recurrent polynya facilitated access to the sea early in the season when ice cover was extensive. Kernel analyses showed that penguins foraged most intensively close to the colony, along submarine canyons and at the continental shelf break. Increases in foraging range, as the chick rearing period progressed, were consistent with changing energy requirements of adults and chicks and likely intraspecific competition. Whilst provisioning their offspring, penguins adopted a variable combination of time minimising and food maximising foraging behaviour in which choice of foraging rule was determined largely by adult body condition.

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Section: Partitioning Of Resources During Chick Rearing and Life Histmentioning

confidence: 47%

Environmental conditions and life history constraints determine foraging range in breeding Adélie penguins

Clarke¹,

Emmerson²,

Otáhal³

2006

Mar. Ecol. Prog. Ser.

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“…The second hypo thesis is that the increased dive performance observed in CORT-implanted birds, disregarding complexity for the moment, might relate to an increase in prey capture rates. This hypothesis is supported by the fact that CORT-birds exploited different dive depths and might as a consequence have encountered different prey species (such as krill, fish or amphipods; Wienecke et al 2000) than control birds, possibly of differing nutritional quality. Moreover, the increase in time spent diving observed during Trip 4 for CORT-birds may also reflect a compensation phenomenon once the hormone returned to baseline levels.…”

Section: Stress Foraging and Body Conditionmentioning

confidence: 96%

Corticosterone administration leads to a transient alteration of foraging behaviour and complexity in a diving seabird

Cottin¹,

MacIntosh²,

Kato³

et al. 2014

Mar. Ecol. Prog. Ser.

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Hormones link environmental stimuli to the behavioural and/or physiological responses of organisms. The release of corticosterone has major effects on both energy mobilization and its allocation among the various requirements of an individual, especially regarding survival and reproduction. We therefore examined the effects of experimentally elevated baseline corticosterone levels on the foraging behaviour of Adélie penguins Pygoscelis adeliae during chickrearing. We monitored the at-sea behaviour of corticosterone-implanted and control male birds using time-depth recorders, and monitored the effects of corticosterone treatment on their body conditions as well as their chicks' body masses and survival. Bio-logged data were examined via traditional measures of diving behaviour as well as fractal analysis as an index of behavioural complexity. Corticosterone administration caused a transient decrease in both overall foraging effort (i.e. reductions in the duration of at-sea trips, the time spent diving and the number of dives performed) and foraging complexity. In contrast, per-dive performance indices suggested an increase in both efficiency and prey pursuit rates. Ultimately, however, we observed no short-term effects of treatment on adult body condition and chick body mass and survival. We conclude that under higher corticosterone levels, sequences of behaviour may become more structured and periodic, as observed in treated birds. The increased energy allocation to dive-scale behaviours observed in treated birds might then reflect an adjustment to intrinsic constraints allowing reductions in energy expenditure at the trip-scale. This study highlights the utility of using both traditional and fractal analyses to better understand scale-dependent responses of animals to energetic and various other environmental challenges.

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“…This study focused on the incubation and the guard stage, because during the crèche stage it was impossible to precisely monitor the birds. Thanks to the method of stomach flushing (Ridoux and Offredo, 1989;Kent et al, 1998;Wienecke et al, 2000;Ropert-Coudert et al, 2002;Libertelli et al, 2003), Adélie penguins are known to prey upon two trophic levels: krill (mainly Euphausia superba and Euphausia cristallorophias) and fish (mainly Pleuragramma antarcticum). These prey species have been segregated by their overall isotopic signature in Adélie Land, Antarctica: Euphausia superba constitutes a lower trophic level than fish and lives in more oceanic areas (Cherel, 2008).…”

Section: Study Species and Areamentioning

confidence: 99%

“…One major component of reproductive effort is foraging activity. Several studies have examined whether animals are able to modify their foraging behaviour according to different breeding constraints, in different foraging locations (Wienecke et al, 2000;Tremblay and Cherel, 2003;Lescroël and Bost, 2005), under different environmental conditions (Green et al, 2005;Yoda and RopertCoudert, 2007) or at different stages of the breeding cycle (Clarke et al, 1998;Clarke, 2001).…”

Section: Introductionmentioning

confidence: 99%

Ecophysiological response of Adélie penguins facing an experimental increase in breeding constraints

Beaulieu

Spée

Lazin

et al. 2010

Journal of Experimental Biology

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SUMMARYForaging strategies play a key role in breeding effort. Little is known, however, about their connection with hormonal and nutritional states, especially when breeding constraints vary. Here, we experimentally increased foraging costs and thus breeding constraints by handicapping Adélie penguins (Pygoscelis adeliae) with dummy devices representing 3-4% of the penguins' crosssectional area. We examined food-related stress (via plasma corticosterone concentration) and nutritional state (via metabolite levels). Concurrently, we investigated the use of ecological niches via the isotopic signature of red blood cells indicating the trophic position ( 15 N) and the spatial distribution ( 13 C) of penguins. Handicapped birds performed ~70% longer foraging trips and lost ~60% more body mass than controls and their partners. However, corticosterone levels and the nutritional state were unchanged. The isotopic signature revealed that males and females differed in their foraging behaviour: upper trophic levels contributed more in the males' diet, who foraged in more pelagic areas. Handicapped and partner birds adopted the same strategy at sea: a shift towards higher  13C values suggested that they foraged in more coastal areas than controls. This change in foraging decisions may optimize feeding time by decreasing travelling time. This may partly compensate for the presumed lower foraging efficiency of handicapped birds and for the energetic debt of their partners who had to fast ~70% longer on the nest. We propose that this flexible use of ecological niches may allow birds facing increased breeding constraints to avoid chronic stress and to minimize the impact on their body condition.

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Adélie penguin foraging behaviour and krill abundance along the Wilkes and Adélie land coasts, Antarctica

Cited by 51 publications

References 9 publications

Environmental conditions and life history constraints determine foraging range in breeding Adélie penguins

Environmental conditions and life history constraints determine foraging range in breeding Adélie penguins

Corticosterone administration leads to a transient alteration of foraging behaviour and complexity in a diving seabird

Ecophysiological response of Adélie penguins facing an experimental increase in breeding constraints

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