Diet of Adélie penguins (Pygoscelis adeliae) at Stranger Point (25 de Mayo/King George Island, Antarctica) over a 13-year period (2003–2015)

Juáres, Mariana A.; Casaux, Ricardo; Corbalán, A.; Blanco, Gabriel; Pereira, Gisela; Perchivale, Pablo J.; Coria, Néstor Rubén; Santos, Mercedes

doi:10.1007/s00300-017-2191-3

Cited by 14 publications

(12 citation statements)

References 35 publications

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“…Our research shows that E. superba represented almost 100% of the stomach contents of three investigated penguin species (Table I), which is similar to the results of Volkman et al (1980), Lishman (1985), Trivelpiece et al (1990), Lynnes et al (2004), Rombolá et al (2010) and Juáres et al (2018), among others, who investigated populations in the West Antarctic Peninsula and the Scotia Sea region. During our study, we observed small fragments of fish (not statistically significant), but only in the stomachs of gentoo penguins (0.5%) and Adélie penguins (0.1%) (Table I).…”

Section: Discussionsupporting

confidence: 90%

“…In the case of penguins, E. superba may constitute between 84.5% (gentoo) and 99% (Adélie and chinstrap) of their food mass (Volkman et al 1980, Juáres et al 2018.…”

Section: Introductionmentioning

confidence: 99%

“…The King George Island (South Shetland Islands) area is a breeding site of three penguin species (the Adélie ( Pygoscelis adeliae ), gentoo ( Pygoscelis papua ) and chinstrap ( Pygoscelis antarcticus )), which tend to exhibit specific reactions to environmental shifts (Forcada et al 2006). Studies of their populations were carried out by, for example, Trivelpiece et al (1987, 2011), Korczak-Abshire et al (2013), Sierakowski et al (2017) and Juáres et al (2018). There are several studies reporting relationships between changes in climate, krill abundance and penguin population size (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Its abundance is fluctuating, which is often associated with the sea-ice reduction during winter and with fluctuations in phytoplankton availability during summer (Siegel 2000). In the case of penguins, E. superba may constitute between 84.5% (gentoo) and 99% (Adélie and chinstrap) of their food mass (Volkman et al 1980, Juáres et al 2018).…”

Section: Introductionmentioning

confidence: 99%

“…High rates of overlap were found near to the shores of Livingston Island and the entrance of Admiralty Bay (Hinke et al 2017b). Knowledge regarding the feeding ecology of a species at each breeding site is essential in order to determine the relationship between the fluctuations in the local marine resources (prey) and the population dynamics of predators (from Juáres et al 2018).…”

Section: Introductionmentioning

confidence: 99%

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Pygoscelis penguin diets on King George Island, South Shetland Islands, with a special focus on the krill Euphausia superba

et al. 2020

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In the krill-based ecosystem of the Antarctic, fluctuations in the distribution and abundance of Euphausia superba may have strong impacts on predator populations; thus, it is crucial to observe the feeding ecology of Antarctic predators, especially in the light of climate change and increasing human pressure. We determined the composition of euphausiid species in diet samples collected from Adélie (Pygoscelis adeliae), chinstrap (Pygoscelis antarcticus) and gentoo (Pygoscelis papua) penguins on King George Island (South Shetlands Islands) during a breeding season. For all three penguin species, euphausiids (mainly E. superba) represented almost the entirety of researched stomach samples (i.e. 99.9% in the case of Adélie and chinstrap penguins), while gentoo penguins also proved to feed on fish (99.4% krill; 0.5% fish). Analysed material differed in the size of eaten E. superba specimens, with the smallest crustaceans consumed by Adélie penguins. Furthermore, we found differences in the ratio of consumed krill and krill size. Such disparities may be a result of sex-based differences and slight differences in feeding areas between the birds. Additionally, we noted some fragments of plastic debris in the investigated penguin diet samples.

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Section: Discussionsupporting

confidence: 90%

“…In the case of penguins, E. superba may constitute between 84.5% (gentoo) and 99% (Adélie and chinstrap) of their food mass (Volkman et al 1980, Juáres et al 2018.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pygoscelis penguin diets on King George Island, South Shetland Islands, with a special focus on the krill Euphausia superba

et al. 2020

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Cyclical prey shortages for a marine polar predator driven by the interaction of climate change and natural climate variability

Lohmann,

Morton,

Schofield

et al. 2023

Limnology & Oceanography

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Between 1992 and 2018, the breeding population of Adélie penguins around Anvers Island, Antarctica declined by 98%. In this region, natural climate variability drives five‐year cycling in marine phytoplankton productivity, leading to phase‐offset five‐year cycling in the size of the krill population. We demonstrate that the rate of change of the Adélie breeding population also shows five‐year cycling. We link this population response to cyclical krill scarcity, a phenomenon which appears to have arisen from the interaction between climate variability and climate change trends. Modeling suggests that, since at least 1980, natural climate variability has driven cycling in this marine system. However, anthropogenic climate change has shifted conditions so that fewer years in each cycle now prompt strong krill recruitment, triggering intervals of krill scarcity that result in drastic declines in Adélie penguins. Our results imply that climate change can amplify the impacts of natural climate oscillations across trophic levels, driving cycling across species and disrupting food webs. The findings indicate that climate variability plays an integral role in driving ecosystem dynamics under climate change.

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Size structure of Antarctic krill inferred from samples of Pygoscelid penguin diets and those collected by the commercial krill fishery

et al. 2021

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Diet of Adélie penguins (Pygoscelis adeliae) at Stranger Point (25 de Mayo/King George Island, Antarctica) over a 13-year period (2003–2015)

Cited by 14 publications

References 35 publications

Pygoscelis penguin diets on King George Island, South Shetland Islands, with a special focus on the krill Euphausia superba

Pygoscelis penguin diets on King George Island, South Shetland Islands, with a special focus on the krill Euphausia superba

Cyclical prey shortages for a marine polar predator driven by the interaction of climate change and natural climate variability

Size structure of Antarctic krill inferred from samples of Pygoscelid penguin diets and those collected by the commercial krill fishery

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