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10 results for “Pygoscelis papua”
Data from: Sulfur isotopic discrimination factors differ among avian tissues and diets: Insights from a case study in Gentoo Penguins (Pygoscelis papua)
<p>The use of stable isotopes of sulfur (δ<sup>34</sup>S) to infer avian diets, foraging habitats, and movements is relatively uncommon, resulting in a lack of information on patterns of δ<sup>34</sup>S incorporation in avian tissue. In a controlled study of Gentoo Penguins (<em>Pygoscelis</em> <em>papua</em>), we found that diet-tissue isotopic discrimination factors (Δ<sup>34</sup>S<sub>diet-tissue</sub>) differed among egg components and feathers synthesized from a common diet, ranging from -0.4 to -1.7 ‰. We also found that methodical choices such as lipid extraction and prey tissue selection influenced calculated Δ<sup>34</sup>S<sub>diet-tissue</sub> values. Specifically, Δ<sup>34</sup>S<sub>diet-tissue</sub> values were lower (i.e., more negative) when calculated using whole fish relative to fish muscle and lipid-extraction biased egg yolk, but not fish tissue, δ<sup>34</sup>S values. Δ<sup>34</sup>S<sub>diet-tissue</sub> values obtained for Gentoo Penguins fed a marine fish diet were generally lower than those reported for freshwater-fish-consuming Double-crested Cormorants (<em>Phalacrocorax</em> <em>auritus</em>), the only other bird species in which Δ<sup>34</sup>S<sub>diet-tissue</sub> has been quantified. We found support for the hypothesis that tissue Δ<sup>34</sup>S<sub>diet-tissue</sub> values are inversely related to dietary δ<sup>34</sup>S values in birds, similar to what has been observed in mammals. Given<span> this relationship, the discrimination factors reported here for </span>Gentoo Penguins <span>may be broadly applicable to other avian species with a similar marine diet.</span> Finally, we provide recommendations for future studies seeking to quantify Δ<sup>34</sup>S<sub>diet-tissue</sub> in avian tissues and guidance to allow for greater application of sulfur stable isotope analysis in ornithological research.</p>
Data from: Sulfur isotopic discrimination factors differ among avian tissues and diets: Insights from a case study in Gentoo Penguins (Pygoscelis papua)
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Palmer Station site, station Palmer Station, study of animal abundance of Pygoscelis papua in units of numberOfBreedingPairs on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Palmer Station (PAL) contains animal abundance of Pygoscelis papua measurements in numberOfBreedingPairs units and were aggregated to a yearly timescale.
Data from: Variation in the ecstatic display call of the Gentoo Penguin (Pygoscelis papua) across regional geographic scales
Geographic variation in bird vocalizations is common and has been associated with genetic differences and speciation, as well as with short-term changes in response to anthropogenic noise. Because vocalizations are used for individual recognition in many species, geographic variation in these traits may affect mate choice, pair bonding, and territory defense. Anecdotal evidence suggests the existence of geographic variation in vocalizations between isolated populations of Gentoo Penguins (Pygoscelis papua), but there have been no comprehensive studies of Gentoo Penguin vocalizations across a broad geographic range. We used acoustic recordings of ambient colony sound at 22 breeding colonies in the Antarctic Peninsula and South Shetland Islands, South Georgia, the Falkland Islands, and Argentina to address 2 main questions regarding Gentoo Penguin vocalizations: (1) How do ecstatic display calls vary both within and between individuals, colonies, and regions? (2) Can ecstatic display calls be used to distinguish subspecies? We found high levels of variation between individuals and between colonies, but little additional variation between regions or subspecies. We found no trends to suggest a latitudinal gradient in vocal characteristics, although we did find that some measures varied with relative distance between colonies. Although we found significant differences at the colony level, unknown calls could not easily be categorized to colony or region by machine learning. We conclude that the vocal soundscape of each colony is driven by variation between individuals within a colony and, developing independently from neighboring colonies, becomes differentiated from other colonies through a process of drift. Although individual calls could, in most cases, be identified to subspecies by machine learning, our analysis suggests that subspecies differences may be driven by variation among colonies and that subspecies identification may be unreliable using acoustics alone.
Gentoo penguins (Pygoscelis papua) react to underwater sounds
<p>Marine mammals and diving birds face several physiological challenges under water, affecting their thermoregulation and locomotion as well as their sensory systems. Therefore, marine mammals have modified ears for improved underwater hearing. <a name="_Hlk5740480">Underwater hearing in marine birds have been studied in a few species, but for the record-holding divers, such as penguins, there are no detailed data</a>. We played underwater noise bursts to gentoo penguins<i> (Pygoscelis papua)</i> in a large tank at sound pressure levels between 100 and 120 dB re 1 µPa rms. The penguins showed a graded reaction to the noise bursts, ranging from no reactions at 100 dB to strong reactions in more than 62% of the playbacks at 120 dB re 1 µPa. The responses were always directed away from the sound source. The fact that penguins can detect and react to underwater stimuli may indicate that they make use of sound stimuli for orientation and prey detection during dives. Further, it suggests that penguins may be sensitive to anthropogenic noise, like many species of marine mammals.</p>
Data from: Population structure and phylogeography of the Gentoo Penguin (Pygoscelis papua) across the Scotia Arc
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Gentoo penguins (Pygoscelis papua) react to underwater sounds
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Data from: Variation in the ecstatic display call of the Gentoo Penguin (Pygoscelis papua) across regional geographic scales
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Structural size measurements and isotopic signatures of foraging among adult male and female gentoo penguins (Pygoscelis papua) nesting along the Palmer Archipelago near Palmer Station, 2007-2009
Sexual segregation in vertebrate foraging niche is often associated with sexual size dimorphism (SSD), i.e., ecological sexual dimorphism. We examined ecological sexual dimorphism among sympatric nesting Pygoscelis penguins near Palmer Station, Antarctica, asking whether environmental variability in the form of winter sea ice is associated with differences in male and female pre-breeding foraging niche. Each season, study nests, where pairs of adults were present, were individually marked and chosen before the onset of egg-laying, and consistently monitored. When study nests were found at the one-egg stage, both adults were captured to obtain blood samples used for molecular sexing and stable isotope analyses, and measurements of structural size and body mass. At the time of capture, each adult penguin was quickly blood sampled (~1 ml) from the brachial vein. After handling, individuals at study nests were further monitored to ensure the pair reached clutch completion, i.e., two eggs. Molecular analyses were conducted at Simon Fraser University following standard PCR protocols, and stable isotope analyses were conducted at the Stable Isotope Facility at the University of California, Davis using an elemental analyzer interfaced with an isotope ratio mass spectrometer
Tracking data for gentoo penguins (Pygoscelis papua) breeding in two sites on the Western Antarctic Peninsula in season 2022/23
<p>This dataseta contain tracking data of gentoo penguins (<em>Pygoscelis papua</em>) during december 2022, breeding in Harmony Point (Nelson Island, South Shetland Islands) and Kopaitic Island (Antarctic Peninsula). Tracking was made with axy-trek marine devices, consisting of 5-minute interval GPS fixes and time depth recorders (TDR). TDR data was previously processed using the R script (appended) to generate summarized dive statistics using the diveMove R package. Each animal have two files, one for raw GPS data and one for summarized dive statistics.</p> <p>Production of this dataset was supported by the Instituto Antártico Chileno, Programa Áreas Marinas Protegidas (AMP 24 03 052), ANID – Programa Iniciativa Milenio – ICN2021_002 (BASE).</p>
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