Relevant bibliographies by topics / Gentoo penguin – Ecology

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  2. Dissertations / Theses
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Academic literature on the topic 'Gentoo penguin – Ecology'

Author: Grafiati
Published: 4 June 2021
Last updated: 5 February 2022

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Journal articles on the topic "Gentoo penguin – Ecology"

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Taylor, Jan R. E. "Thermal Insulation of the Down and Feathers of Pygoscelid Penguin Chicks and the Unique Properties of Penguin Feathers." Auk 103, no. 1 (1986): 160–68. http://dx.doi.org/10.1093/auk/103.1.160.

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Abstract The thermal insulation of the down and feathers of Chinstrap (Pygoscelis antarctica) and Gentoo (P. papua) penguin chicks was measured throughout development in still air and in wind parallel and perpendicular to the plumage. Insulation increased with age. Whole-body insulation of chicks measured in still air (body core to environment) was significantly correlated with the insulation of their pelts at a given age. The insulation of the downy pelts of 10- and 15-day-old chicks was significantly lower than that of all older chicks, and explains the dependence of chicks of that age on co
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Emslie, Steven D., Michael J. Polito, and William P. Patterson. "Stable isotope analysis of ancient and modern gentoo penguin egg membrane and the krill surplus hypothesis in Antarctica." Antarctic Science 25, no. 2 (2013): 213–18. http://dx.doi.org/10.1017/s0954102012000740.

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AbstractThe ‘krill surplus’ hypothesis in Antarctica posits that the historic depletion of krill-eating whales and seals in the 18–20th centuries provided a surplus of krill in the Southern Ocean that benefited penguins. A previous study which examined stable isotopes in ancient and modern tissues of Adélie penguin (Pygoscelis adeliae) provides support for this hypothesis. Specifically, a significant decrease in δ13C and δ15N values occurred in modern versus ancient tissues from an apparent dietary shift from fish to krill associated with the purported krill surplus. Here, we present new data
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ZHU, RENBIN, LIGUANG SUN, XUEBIN YIN, ZHOUQING XIE, and XIAODONG LIU. "Geochemical evidence for rapid enlargement of a gentoo penguin colony on Barton Peninsula in the maritime Antarctic." Antarctic Science 17, no. 1 (2005): 11–16. http://dx.doi.org/10.1017/s0954102005002373.

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Gentoo penguin Pygoscelis papua is an important component of the Antarctic marine ecosystem. In this paper, we use an indirect approach, a geochemical method combining with 137Cs and 210Pb CRS mode dating, to study the dynamics of the gentoo population and colony on Barton Peninsula, King George Island, in the maritime Antarctic. Five sediment profiles were sampled in the zone between the gentoo penguin colony and tundra vegetation on this peninsula and the sediment sequence and typical elements from penguin guano were analysed. Results showed that the levels for typical elements display a dra
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Gil-Delgado, J. A., J. González-Solís, and A. Barbosa. "Populations of breeding birds in Byers Peninsula, Livingston Island, South Shetland Islands." Antarctic Science 25, no. 2 (2013): 303–6. http://dx.doi.org/10.1017/s0954102012000752.

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AbstractData about breeding populations of birds in the Antarctica are rare and fragmented. Thus, information about the status of the breeding populations of Antarctic birds is crucial given the current scenario of climate change, which is particularly acute in Antarctica. This paper presents new information about the populations of the Antarctic tern Sterna vittata, the kelp gull Larus dominicanus, the southern giant petrel Macronectes giganteus, the Antarctic skua Catharacta antarctica lonnbergi, the chinstrap penguin Pygoscelis antarctica and the gentoo penguin Pygoscelis papua on Byers Pen
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Hill, Simeon L., Keith Reid, and Anthony W. North. "Recruitment of mackerel icefish (Champsocephalus gunnari) at South Georgia indicated by predator diets and its relationship with sea surface temperature." Canadian Journal of Fisheries and Aquatic Sciences 62, no. 11 (2005): 2530–37. http://dx.doi.org/10.1139/f05-157.

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The South Georgia population of mackerel icefish (Champsocephalus gunnari) is exploited by both a fishery and predators, including gentoo penguins (Pygoscelis papua). Because considerable uncertainty surrounds recent estimates of stock size, there is a need to consider novel approaches that may give insight into the population dynamics of this species. We derive two indices of recruitment based on the occurrence of mackerel icefish in gentoo penguin diets, one of which is scaled by a survey estimate of the density of Antarctic krill (Euphausia superba), an alternative prey species for gentoo p
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Panasiuk, Anna, Justyna Wawrzynek-Borejko, Aleksandra Musiał, and Małgorzata Korczak-Abshire. "Pygoscelis penguin diets on King George Island, South Shetland Islands, with a special focus on the krill Euphausia superba." Antarctic Science 32, no. 1 (2020): 21–28. http://dx.doi.org/10.1017/s0954102019000543.

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AbstractIn 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 pengui
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Levy, Hila, Steven R. Fiddaman, Juliana A. Vianna, et al. "Evidence of Pathogen-Induced Immunogenetic Selection across the Large Geographic Range of a Wild Seabird." Molecular Biology and Evolution 37, no. 6 (2020): 1708–26. http://dx.doi.org/10.1093/molbev/msaa040.

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Abstract Over evolutionary time, pathogen challenge shapes the immune phenotype of the host to better respond to an incipient threat. The extent and direction of this selection pressure depend on the local pathogen composition, which is in turn determined by biotic and abiotic features of the environment. However, little is known about adaptation to local pathogen threats in wild animals. The Gentoo penguin (Pygoscelis papua) is a species complex that lends itself to the study of immune adaptation because of its circumpolar distribution over a large latitudinal range, with little or no admixtu
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Lescroël, Amélie, Catherine Bajzak, and Charles-André Bost. "Breeding ecology of the gentoo penguin Pygoscelis papua at Kerguelen Archipelago." Polar Biology 32, no. 10 (2009): 1495–505. http://dx.doi.org/10.1007/s00300-009-0647-9.

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Adams, N. J., C. Moloney, and R. Navarro. "Estimated food consumption by penguins at the Prince Edward Islands." Antarctic Science 5, no. 3 (1993): 245–52. http://dx.doi.org/10.1017/s0954102093000331.

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The consumption of food by the four species of breeding penguins at the Prince Edward Islands is assessed on an annual and seasonal basis. Total annual food consumption was estimated at 880 000 t, of which king penguins accounted for 74%, macaroni penguins 21%, rockhopper penguins 5% and gentoo penguins <1%. Pelagic fish, almost entirely myctophids, were the most important prey (70% of total prey biomass), followed by pelagic crustaceans (18%) and cephalopods (11%). Demersal fish and benthic crustaceans accounted for <1% of total consumption, being consumed only by gentoo penguins. Peak
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Barbosa, Andrés, Eva de Mas, Jesús Benzal, et al. "Pollution and physiological variability in gentoo penguins at two rookeries with different levels of human visitation." Antarctic Science 25, no. 2 (2013): 329–38. http://dx.doi.org/10.1017/s0954102012000739.

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AbstractHuman activity and specifically tourism has been increasing in Antarctica over the last few years. Few studies have examined the indirect effects of human visits on Antarctic penguin rookeries. This work aims to study the differences between a highly visited (Hannah Point) and a rarely visited (Devil's Point, Byers Peninsula) gentoo penguin rookery on Livingston Island. Our results suggest that potential indirect effects of human impact are observed in gentoo penguins at Hannah Point, a colony heavily visited by tourists. Penguins at Hannah Point showed a higher presence of heavy metal
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Dissertations / Theses on the topic "Gentoo penguin – Ecology"

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Handley, Jonathan Murray. "Foraging ecology of gentoo penguins pygoscelis papua at the Falkland Islands." Thesis, Nelson Mandela University, 2017. http://hdl.handle.net/10948/14113.

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Marine top predators often occupy broad geographical ranges that encompass varied habitats. Therefore, a pre-requisite towards conserving these animals is to determine the components of their realized niche, and investigate whether a species is a specialist or a generalist. For generalist species, it is also necessary to understand if local specialisation occurs. Uncovering these components can allow us to build models of a species realized niche that may then be used to infer habitat use in unsampled locations. However, fully understanding the components of a marine top predators realized nic
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Carpenter-Kling, Tegan. "Foraging ecology of the gentoo penguin, pygoscelis papua, at Marion Island." Thesis, Nelson Mandela Metropolitan University, 2016. http://hdl.handle.net/10948/4912.

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The distribution and subsequent availability of marine predators’ prey is highly variable and is linked to fluctuating oceanographic parameters. It is well documented that annual breeding success of seabirds is related to the temporal availability of prey. Knowledge of a seabird’s diet and at sea distribution is therefore critical in deducing the effect of a fluctuating environment on a seabirds’ population and, furthermore, to understand seabirds role in the environment. The gentoo penguin population at sub-Antarctic Marion Island experienced a decline of 52% between 1994 and 2012. It has bee
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Valls, Fernanda Caminha Leal. "Ecologia alimentar de spheniscidae na Ilha Elefante, Antártica." Universidade do Vale do Rio dos Sinos, 2013. http://www.repositorio.jesuita.org.br/handle/UNISINOS/4711.

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Valente, Tiago Miguel Guerreiro. "Feeding ecology of gentoo penguins Pygoscelis papua at Livingston Island (Antarctic)." Master's thesis, 2014. http://hdl.handle.net/10316/26321.

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Dissertação de Mestrado em Ecologia, apresentada ao Departamento de Ciências da Vida da Faculdade de Ciências e Tecnologia da Universidade de Coimbra,<br>Climate change has been affecting the Southern Ocean, particularly in the Antarctic Peninsula where the rate of temperature increase is around 3.5 ºC per century. This warming is affecting the duration and extent of the formation of sea ice, and ice shelves, which are known to play an important role in the recruitment and replenishment of stock of Antarctic krill (Euphausia superba). Antarctic krill is the keystone species of the food we
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Book chapters on the topic "Gentoo penguin – Ecology"

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BOST, CHARLES-ANDRÉ, and PIERRE JOUVENTIN. "Evolutionary Ecology of Gentoo Penguins (Pygoscelis papua)." In Penguin Biology. Elsevier, 1990. http://dx.doi.org/10.1016/b978-0-08-057106-5.50011-5.

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