Effects of human activity on adelie penguin Pygoscelis adeliae breeding success

1996 ◽  
Vol 75 (2) ◽  
pp. 157-164 ◽  
Author(s):  
Melissa Giese
Keyword(s):  
Human Activity ◽  
Breeding Success ◽  
Adélie Penguin ◽  
Pygoscelis Adeliae ◽  
Adelie Penguin

Ecstatic display calls of the Adélie penguin honestly predict male condition and breeding success

Behaviour ◽  
2010 ◽  
Vol 147 (2) ◽  
pp. 165-184 ◽  
Author(s):  
Dianne Brunton ◽  
Allen Rodrigo ◽  
Emma Marks
Keyword(s):  
Frequency Modulation ◽  
Breeding Success ◽  
Female Mate Choice ◽  
Adélie Penguin ◽  
Honest Signal ◽  
Pygoscelis Adeliae ◽  
Breeding Colony ◽  
Adelie Penguin ◽  
Territory Defence ◽  
Male Condition

AbstractThe Adélie penguin (Pygoscelis adeliae) breeds in large, noisy Antarctic colonies and has evolved a communication system of complex intra- and inter-sexual visual and vocal behaviours. The Ecstatic Display Call (EDC) given by males whilst at the breeding colony is composed of introductory beats, short repeated syllables and a climactic long syllable. Here, we show that spectral qualities of the short syllables of the EDC can predict body condition and breeding success and suggest that in addition to its role in territory defence, the EDC may function as an honest signal of male quality for female mate choice. In the short repeated syllables frequency modulation, mean frequency, and pitch were all significantly lower in birds of better condition, with frequency modulation changing concomitantly with changing condition during the breeding season. Furthermore, during the period of mate attraction, a male's frequency modulation predicted both his latency to pair and likelihood of successfully breeding. Due to the long incubation fasts in this species we propose that female Adélie penguins may reliably use frequency modulation of the EDC as a potentially honest signal of early season male condition and the likelihood of a successful breeding outcome.

Adélie penguin population changes at Stranger Point: 19 years of monitoring

2015 ◽  
Vol 27 (5) ◽  
pp. 455-461 ◽  
Author(s):  
Mariana A. Juáres ◽  
Mercedes Santos ◽  
Javier Negrete ◽  
Jorge A. Mennucci ◽  
Pablo J. Perchivale ◽  
...  
Keyword(s):  
Breeding Success ◽  
Breeding Population ◽  
Adélie Penguin ◽  
Temporal Fluctuation ◽  
Pygoscelis Adeliae ◽  
Adelie Penguin ◽  
Interannual Fluctuations ◽  
New Recruits ◽  
The Antarctic ◽  
Future Population

AbstractThe Adélie penguin (Pygoscelis adeliae) breeding population at Stranger Point, King George Island (25 de Mayo), increased in number from 1965/66 until 1980/81 after which it started to decrease almost continuously up to the present. A significant decrease in the number of breeding pairs and chicks crèched was observed between 1995/96 and 2013/14 (75% and 78%, respectively), although the rate of this decrease has slowed since 2006/07. Over the last seven years, larger interannual fluctuations were recorded in the number of breeding pairs and chicks in crèches, as well in the breeding success. The values for the index of breeding success during 2007/08, 2009/10 and 2012/13 were low and this parameter showed higher temporal fluctuation in the period 2007/08 to 2013/14. The reduction in breeding success and the number of chicks reared to crèche will unfavourably impact on future population size at Stranger Point through the reduction of new recruits. Although Adélie penguin population trends on the Antarctic Peninsula are linked to the marine environment variability (i.e. reduction in sea ice affecting the availability of prey), breeding success is also influenced by the amount of snow fall which has increased in recent years.

scholarly journals Anthropogenic activities are associated with shorter telomeres in chicks of Adélie penguin (Pygoscelis adeliae)

Polar Biology ◽  
2021 ◽  
Author(s):  
Jilda Alicia Caccavo ◽  
Thierry Raclot ◽  
Timothée Poupart ◽  
Yan Ropert-Coudert ◽  
Frédéric Angelier
Keyword(s):  
Telomere Length ◽  
Human Activity ◽  
Anthropogenic Activities ◽  
Adélie Penguin ◽  
Pygoscelis Adeliae ◽  
Adelie Penguin ◽  
Fitness Consequences ◽  
Length Analysis ◽  
The Impact ◽  
The Relationship

AbstractDefining the impact of anthropogenic stressors on Antarctic wildlife is an active aim for investigators. Telomeres represent a promising molecular tool to investigate the fitness of wild populations, as their length may predict longevity and survival. We examined the relationship between telomere length and human exposure in Adélie penguin chicks (Pygoscelis adeliae) from East Antarctica. Telomere length was compared between chicks from areas with sustained human activity and on neighboring protected islands with little or no human presence. Adélie penguin chicks from sites exposed to human activity had significantly shorter telomeres than chicks from unexposed sites in nearby protected areas, with exposed chicks having on average 3.5% shorter telomeres than unexposed chicks. While sampling limitations preclude our ability to draw more sweeping conclusions at this time, our analysis nonetheless provides important insights into measures of colony vulnerability. More data are needed both to understand the proximate causes (e.g., stress, feeding events) leading to shorter telomeres in chicks from human exposed areas, as well as the fitness consequences of reduced telomere length. We suggest to further test the use of telomere length analysis as an eco-indicator of stress in wildlife among anthropized sites throughout Antarctica.

scholarly journals Growing in Antarctica, a challenge for white adipose tissue development in Adélie penguin chicks (Pygoscelis adeliae)

2008 ◽  
Vol 295 (5) ◽  
pp. R1671-R1679 ◽  
Author(s):  
Mireille Raccurt ◽  
Fannie Baudimont ◽  
Julien Tirard ◽  
Benjamin Rey ◽  
Elodie Moureaux ◽  
...  
Keyword(s):  
Growth Hormone ◽  
Adipose Tissue ◽  
Fatty Acid Synthase ◽  
Growth Hormone Receptor ◽  
Adélie Penguin ◽  
Lipid Uptake ◽  
Tissue Development ◽  
Pygoscelis Adeliae ◽  
Adelie Penguin ◽  
Adipose Tissue Development

Rapid growth is of crucial importance for Adélie penguin chicks reared during the short Antarctic summer. It partly depends on the rapid ontogenesis of fat stores that are virtually null at hatching but then develop considerably (×40) within a month to constitute both an isolative layer against cold and an energy store to fuel thermogenic and growth processes. The present study was aimed at identifying by RT-PCR the major transcriptional events that chronologically underlie the morphological transformation of adipocyte precursors into mature adipocytes from hatching to 30 days of age. The peak expression of GATA binding protein 3, a marker of preadipocytes, at day 7 posthatch indicates a key proliferation step, possibly in relation to the expression of C/EBPα (C/EBPα). High plasma total 3,5,3′-triiodo-l-thyronine (T3) levels and high levels of growth hormone receptor transcripts at hatching suggested that growth hormone and T3 play early activating roles to favor proliferation of preadipocyte precursors. Differentiation and growth of preadipocytes may occur around day 15 in connection with increased abundance of transcripts encoding IGF-1, proliferator-activated receptor-γ, and C/EBPβ, gradually leading to functional maturation of metabolic features of adipocytes including lipid uptake and storage (lipoprotein lipase, fatty-acid synthase) and late endocrine functions (adiponectin) by day 30. Present results show a close correlation between adipose tissue development and chick biology and a difference in the scheduled expression of regulatory factors controlling adipogenesis compared with in vitro studies using cell lines emphasizing the importance of in vivo approaches.

A 9000-year record of Adélie penguin occupation and diet in the Windmill Islands, East Antarctica

2005 ◽  
Vol 17 (1) ◽  
pp. 57-66 ◽  
Author(s):  
STEVEN D. EMSLIE ◽  
ERIC J. WOEHLER
Keyword(s):  
Population Cycles ◽  
East Antarctica ◽  
Adélie Penguin ◽  
Pygoscelis Adeliae ◽  
Pleuragramma Antarcticum ◽  
Fish Prey ◽  
Adelie Penguin ◽  
Radiocarbon Dates ◽  
Nest Site Fidelity ◽  
Windmill Islands

We investigated 17 abandoned Adélie penguin (Pygoscelis adeliae) colonies in the Windmill Islands, East Antarctica, in summer 2002/03. Forty radiocarbon dates on penguin bones and eggshells from 13 of these sites indicate a near continuous occupation by breeding penguins in this region for over 9000 years. These dates refine the recent geological record in this region and indicate that deglaciation of the northern islands occurred much earlier than previously suggested. Dietary remains from these sites include at least 23 taxa of cephalopods and teleost fish. Quantification of these remains indicates significant fluctuations in the relative abundance of two of the more common major prey taxa. The Antarctic silverfish (Pleuragramma antarcticum Boulenger) was the most common teleost prey during all time periods represented by the ages of the sites, but preservational factors may explain a gradual decrease in the remains of this species in increasingly older sites. The most common cephalopod in the sediments was the squid, Psychroteuthis glacialis Thiele, which occurred in low numbers in most sites except one (Site 75). An unusually high number of squid beaks preserved in Site 75, dating to approximately 5700–6100 cal. yr BP, does not correlate with a decrease in fish prey at that time. The high number of abandoned penguin colonies (> 200) in the Windmill Islands may be due to population cycles in the past in association with low nest-site fidelity and movement by breeding penguins to new sites within this region.

Ontogeny of muscle bioenergetics in Adélie penguin chicks (Pygoscelis adeliae)

2013 ◽  
Vol 305 (9) ◽  
pp. R1065-R1075 ◽  
Author(s):  
Anaïs Fongy ◽  
Caroline Romestaing ◽  
Coralie Blanc ◽  
Nicolas Lacoste-Garanger ◽  
Jean-Louis Rouanet ◽  
...  
Keyword(s):  
Muscle Fiber ◽  
Relative Abundance ◽  
Oxidative Activity ◽  
Adélie Penguin ◽  
Pygoscelis Adeliae ◽  
Western Blots ◽  
Adelie Penguin ◽  
Isolated Mitochondria ◽  
Mitochondrial Fractions ◽  
Permeabilized Fibers

The ontogeny of pectoralis muscle bioenergetics was studied in growing Adélie penguin chicks during the first month after hatching and compared with adults using permeabilized fibers and isolated mitochondria. With pyruvate-malate-succinate or palmitoyl-carnitine as substrates, permeabilized fiber respiration markedly increased during chick growth (3-fold) and further rose in adults (1.4-fold). Several markers of muscle fiber oxidative activity (cytochrome oxidase, citrate synthase, hydroxyl-acyl-CoA dehydrogenase) increased 6- to 19-fold with age together with large rises in intermyofibrillar (IMF) and subsarcolemmal (SS) mitochondrial content (3- to 5-fold) and oxidative activities (1.5- to 2.4-fold). The proportion of IMF relative to SS mitochondria increased with chick age but markedly dropped in adults. Differences in oxidative activity between mitochondrial fractions were reduced in adults compared with hatched chicks. Extrapolation of mitochondrial to muscle respirations revealed similar figures with isolated mitochondria and permeabilized fibers with carbohydrate-derived but not with lipid-derived substrates, suggesting diffusion limitations of lipid substrates with permeabilized fibers. Two immunoreactive fusion proteins, mitofusin 2 (Mfn2) and optic atrophy 1 (OPA1), were detected by Western blots on mitochondrial extracts and their relative abundance increased with age. Muscle fiber respiration was positively related with Mfn2 and OPA1 relative abundance. Present data showed by two complementary techniques large ontogenic increases in muscle oxidative activity that may enable birds to face thermal emancipation and growth in childhood and marine life in adulthood. The concomitant rise in mitochondrial fusion protein abundance suggests a role of mitochondrial networks in the skeletal muscle processes of bioenergetics that enable penguins to overcome harsh environmental constraints.

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