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  • 1
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    (Table 1) Annual breeding success and mean body mass of little penguins (Eudyptula minor) from 2001 to 2008 at Phillip Island
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: DATE/TIME; Mass; Number; OBSE; Observation; Phillip_Is; Standard deviation; Victoria, Australia
    Type: Dataset
    Format: text/tab-separated-values, 56 data points
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  • 2
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    (Table 2) Description of equal and unequal pairs of little penguins (Eudyptula minor) on Phillip Island over 8 years
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Age, relative, number of years; Age, standard deviation; Duration, number of days; Group; Mass; Number; OBSE; Observation; Phillip_Is; Proportion; Sample amount; Standard deviation; Victoria, Australia
    Type: Dataset
    Format: text/tab-separated-values, 42 data points
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  • 3
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    (Table 3) Proportion of unequal pairs in little penguins (Eudyptula minor) depending on hatching/guard success and postguard success on Phillip Island between 2001 and 2008
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: DATE/TIME; Description; Index; OBSE; Observation; Phillip_Is; Proportion; Victoria, Australia
    Type: Dataset
    Format: text/tab-separated-values, 48 data points
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  • 4
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    (Table 1) Egg laying and hatching dates and guarding duration of Adélie penguins (Pygoscelis adeliae) on Petrel Island, Antarctica (2010)
    PANGAEA
    In:  Supplement to: Beaulieu, Michaël; Dervaux, Antoine; Thierry, Anne-Mathilde; Lazin, David; Le Maho, Yvon; Ropert-Coudert, Yan; Spée, Marion; Raclot, Thierry; Ancel, André (2010): When sea-ice clock is ahead of Adelie penguins' clock. Functional Ecology, 24(1), 93-102, https://doi.org/10.1111/j.1365-2435.2009.01638.x
    Details
    Publication Date: 2023-12-13
    Description: 1. In Polar Regions, the extent and dynamics of sea-ice are changing. This affects the ocean productivity which consecutively impacts plankton communities and polar top predators like penguins. Yet, the underlying behavioural and physiological mechanisms remain poorly understood. 2. Here we monitored the ecophysiological responses of Adelie penguin (Pygoscelis adeliae) pairs during two seasons of contrasting timing of sea-ice retreat. Beside classical breeding parameters like foraging trip duration, body mass and reproductive success, we also investigated food-related stress (via plasma corticosterone concentration), nutritional state (via metabolite levels) and the use of penguins' habitat (via blood isotopic values). 3. Body mass and reproductive success remained unchanged but foraging trips were shorter when sea-ice retreated earlier. Constant plasma corticosterone concentrations indicated that none of the feeding conditions resulted in a food-related stress. However metabolite levels were lower when sea-ice retreated early, suggesting that the foraging performance and the quality/quantity of food differed. Indeed isotopic ratios indicated that coastal prey like fish contributed more to the penguins' diet when sea-ice retreated prematurely. 4. The early sea-ice retreat was related to higher chlorophyll concentrations, known to favour krill recruitment. Paradoxically, this was not associated to a higher krill contribution in the penguins' diet. We propose that a shift in the phytoplankton quality (rather than quantity), affecting krill recruitment, forced penguins to switch to more available prey like coastal fish. 5. In some Antarctic regions, sea-ice is retreating earlier and earlier. In the present study, even though the timing of sea-ice retreat and the consecutive ocean productivity differed drastically between the 2 years, Adelie penguins were not severely affected because they were able to adjust their at-sea behaviour and thus maintained their body condition and reproductive success unchanged. 6. This suggests that the timing of sea-ice retreat does not represent an important threat to populations of Adelie penguins at least as long as alternative resources are still available and other environmental parameters like winter sea-ice extent are not dramatically altered.
    Keywords: Antarctica; BIO; Biology; Duration, number of days; International Polar Year (2007-2008); Interval comments; IPY; Observed; Petrel_Is; Pygoscelis adeliae, egg laying date; Pygoscelis adeliae, hatching date; Sample amount; Sex; Standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 40 data points
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    DATA PANGAEA
  • 5
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    (Table 1) Comparison of dive duration and speed of Adélie penguins (Pygoscelis adeliae) equipped with internal and external devices (2010)
    PANGAEA
    In:  Supplement to: Beaulieu, Michaël; Ropert-Coudert, Yan; Le Maho, Yvon; Ancel, André (2010): Is abdominal implantation of devices a good alternative to external attachment? A comparative study in Adélie penguins. Journal of Ornithology, 151(3), 579-586, https://doi.org/10.1007/s10336-009-0491-2
    Details
    Publication Date: 2023-12-13
    Description: Bio-logging studies suffer from the lack of real controls. However, it is still possible to compare indirect parameters between control and equipped animals to assess the level of global disturbance due to instrumentation. In addition, it is also possible to compare the behaviour of free-ranging animals between individuals equipped with different techniques or instruments to determine the less deleterious approach. We instrumented Adelie Penguins (Pygoscelis adeliae) with internal or external time-depth recorders and monitored them in parallel with a control group during the first foraging trip following instrumentation. Foraging trip duration was significantly longer in the internally-equipped group. This difference was due to a larger number of dives, reflecting a lower foraging ability or a higher food demand, and longer periods of recovery at the surface. These longer recovery periods were likely to be due to a reduced efficiency to ventilate at the surface, probably because the implanted devices pressurised adjacent organs such as air sacs. Moreover, descent and ascent rates were slightly lower in externally-equipped penguins, presumably because external instrumentation increased the bird drag. Looking at our results, implantation appears more disadvantageous - at least for short-term deployment - than external equipment in Adelie Penguins, while this method has been described to induce no negative effects in long-term studies. This underlines the need to control for potential effects due to methodological aspects in any study using data loggers in free-ranging animals, to minimise disturbance and collect reliable data.
    Keywords: Antarctica; BIO; Biology; Device type; Dive, duration; Dive/swim depth; Dive depth, standard deviation; International Polar Year (2007-2008); IPY; Number; Petrel_Is; Sample amount; Speed, velocity; Standard deviation; Time in seconds
    Type: Dataset
    Format: text/tab-separated-values, 40 data points
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  • 6
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    (Table 1) Diving behaviour of male Adélie penguins (Pygoscelis adeliae) with and without corticosterone implants at Pointe Géologie (2011)
    PANGAEA
    In:  Supplement to: Cottin, Manuelle; Kato, Akiko; Thierry, Anne-Mathilde; Le Maho, Yvon; Raclot, Thierry; Ropert-Coudert, Yan (2011): Does corticosterone affect diving behaviour of male Adelie Penguins? A preliminary experimental study. ORNITHOLOGICAL SCIENCE, 10(1), 3-11, https://doi.org/10.2326/osj.10.3
    Details
    Publication Date: 2023-12-13
    Description: The amount of energy that organisms can allocate to self-maintenance and/or reproduction largely depends on their foraging strategies. Because of corticosterone (CORT) involvement in the control of energy metabolism, food intake and locomotor activity, recent studies have sought to demonstrate the role of this hormone in foraging decisions and performance. Moreover, considerable recent advances in animal-attached loggers now allow the study of behaviour in free-living animals. In order to assess the effects of CORT administration on the foraging behaviour of free-living Adelie Penguins Pygoscelis adeliae, we studied a group with CORT implants and a control group without CORT implants, by attaching time-depth recorders to the two groups and monitoring them throughout up to seven consecutive foraging trips during the guard stage (in Adelie Land, Antarctica). We found that foraging trips duration was similar between both groups. Dive durations, time spent at the bottom phase of dives, and the number of undulations per dive of CORT-implanted birds were all significantly higher than those of controls. However, CORT-implanted birds performed fewer dives overall (ca. 4,400) than controls (ca. 6,250) and spent many (13 and 6 times for penguins #3 and #4, respectively) long periods (〉3 h) without diving. The low foraging effort and long resting periods support the view that CORT-implanted birds probably gained less energy than did the control birds. CORT treatment appears then to result in redirecting bird behaviour from costly activity (i.e. reproduction) to a behaviour promoting the preservation of energy reserves. Future studies are therefore needed to assess body condition and reproductive success of CORT-manipulated birds in parallel with the recording of their diving performances.
    Keywords: Adelie Land; BIO; Biology; Calculated after Gentry & Kooyman (1986); Duration, number of days; Identification; International Polar Year (2007-2008); IPY; Number; Number of dives per trip; Pointe_Géologie; Proportion of time; Proportion of time, standard error; Pygoscelis adeliae, dive depth maximum; Pygoscelis adeliae, standard deviation; Standard deviation; Time-depth recorder, Cefas Technology (Cefas G5); Time in seconds; Treatment
    Type: Dataset
    Format: text/tab-separated-values, 80 data points
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  • 7
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    (Table 1) Foraging trip characteristics of male Adélie penguins (Pygoscelis adeliae) during their first incubation trip at Pointe Géologie (2012)
    PANGAEA
    In:  Supplement to: Cottin, Manuelle; Raymond, Ben; Kato, Akiko; Amélineau, Françoise; Le Maho, Yvon; Raclot, Thierry; Galton-Fenzi, Ben; Meijers, Andrew; Ropert-Coudert, Yan (2012): Foraging strategies of male Adelie penguins during their first incubation trip in relation to environmental conditions. Marine Biology, 159(8), 1843-1852, https://doi.org/10.1007/s00227-012-1974-x
    Details
    Publication Date: 2023-12-13
    Description: Knowledge of habitat use by top marine predators in response to environmental conditions is crucial in the current context of global changes occurring in the Southern Ocean. We examined the at-sea locations of male Adelie penguins (Pygoscelis adeliae) breeding at Dumont d'Urville during their first, long incubation trip. Compared with the chick-rearing period, penguins performed longer trips, going to oceanic waters as far as 320 km from the colony. We observed 3 strategies: (1) five individuals covered large distances to the north, targeting open-ocean areas and following the currents of two persistent eddies; (2) five individuals foraged to the north-west, close to the Antarctic shelf slope at the limit of the pack ice; and (3) three individuals covered much shorter distances (northwards or eastwards). The foraging range also seemed to be limited by the body condition of the penguins before their departure to sea.
    Keywords: Adelie Land; BIO; Biology; DATE/TIME; Direction; Distance; Duration, number of days; GPS logger CatTraQ, customized; Identification; International Polar Year (2007-2008); IPY; Pointe_Géologie
    Type: Dataset
    Format: text/tab-separated-values, 65 data points
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  • 8
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    Breeding success and traits of equal and unequal pairs of little penguins (Eudyptula minor) on Phillip Island during 2001-2008 (2011)
    PANGAEA
    In:  Supplement to: Saraux, Claire; Chiaradia, André; Le Maho, Yvon; Ropert-Coudert, Yan (2011): Everybody needs somebody: unequal parental effort in little penguins. Behavioral Ecology, 22(4), 837-845, https://doi.org/10.1093/beheco/arr049
    Details
    Publication Date: 2023-12-13
    Description: According to life-history theory, individuals optimize their decisions in order to maximize their fitness. This raises a conflict between parents, which need to cooperate to ensure the propagation of their genes but at the same time need to minimize the associated costs. Trading-off between benefits and costs of a reproduction is one of the major forces driving demographic trends and has shaped several different parental care strategies. Using little penguins (Eudyptula minor) as a model, we investigated whether individuals of a pair provide equal parental effort when raising offspring and whether their behavior was consistent over 8 years of contrasting resource availability. Using an automated identification system, we found that 72% of little penguin pairs exhibited unforced (i.e., that did not result from desertion of 1 parent) unequal partnership through the postguard stage. This proportion was lower in favorable years. Although being an equal pair appeared to be a better strategy, it was nonetheless the least often observed. Individuals that contributed less than their partner were not less experienced (measured by age), and gender did not explain differences between partners. Furthermore, birds that contributed little or that contributed a lot tended to be consistent in their level of contribution across years. We suggest that unequal effort during breeding may reflect differences in individual quality, and we encourage future studies on parental care to consider this consistent low and high contributor behavior when investigating differences in pair investment into its offspring. Key words: attendance patterns, individual quality, meal size, parental care, reproductive costs, seabirds.
    Keywords: International Polar Year (2007-2008); IPY; OBSE; Observation; Phillip_Is; Victoria, Australia
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 9
    Electronic Resource
    Electronic Resource
    Recognition could support a science code of conduct (2007)
    [s.l.] : Nature Publishing Group
    Nature 447 (2007), S. 259-259 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Sir Recent instances of scientifically unethical behaviour such as that of Woo Suk Hwang (see Nature 439, 122–123; doi:10.1038/439122a 2006) have put pressure on governments to take official ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/447259c
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    Paper (German National Licenses)
    Fulltext
  • 10
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    How do different data logger sizes and attachment positions affect the diving behaviour of little penguins? (2007)
    Elsevier
    Details
    Publication Date: 2007-02-01
    Print ISSN: 0967-0645
    Electronic ISSN: 1879-0100
    Topics: Biology , Geosciences , Physics
    Published by Elsevier
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