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Author |
Fay Rémi, Barbraud Christophe, Delord Karine, Weimerskirch Henri |
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Title |
Paternal but not maternal age influences early-life performance of offspring in a long-lived seabird |
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Journal Article |
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Year |
2016 |
Publication |
Proceedings of the royal society b-biological sciences |
Abbreviated Journal |
Proc. Biol. Sci. |
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Volume |
283 |
Issue |
1828 |
Pages |
20152318 |
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Abstract |
Variability in demographic traits between individuals within populations has profound implications for both evolutionary processes and population dynamics. Parental effects as a source of non-genetic inheritance are important processes to consider to understand the causes of individual variation. In iteroparous species, parental age is known to influence strongly reproductive success and offspring quality, but consequences on an offspring fitness component after independence are much less studied. Based on 37 years longitudinal monitoring of a long-lived seabird, the wandering albatross, we investigate delayed effects of parental age on offspring fitness components. We provide evidence that parental age influences offspring performance beyond the age of independence. By distinguishing maternal and paternal age effects, we demonstrate that paternal age, but not maternal age, impacts negatively post-fledging offspring performance. |
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109 |
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0962-8452 |
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yes |
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6496 |
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Author |
Delord Karine, Pinet Patrick, Pinaud David, Barbraud Christophe, De Grissac Sophie, Lewden Agnès, Cherel Yves, Weimerskirch Henri |
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Title |
Species-specific foraging strategies and segregation mechanisms of sympatric Antarctic fulmarine petrels throughout the annual cycle |
Type |
Journal Article |
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Year |
2016 |
Publication |
Ibis |
Abbreviated Journal |
Ibis (Lond. 1859) |
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Volume |
158 |
Issue |
3 |
Pages |
569-586 |
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Abstract |
Determining the year-round distribution and behaviour of birds is necessary for a better understanding of their ecology and foraging strategies. Petrels form an important component of the high-latitude seabird assemblages in terms of species and individuals. The distribution and foraging ecology of three sympatric fulmarine petrels (Southern Fulmar Fulmarus glacialoides, Cape Petrel Daption capense and Snow Petrel Pagodroma nivea) were studied at Adélie Land, East Antarctica, by combining information from miniaturized saltwater immersion geolocators and stable isotopes from feathers. During the breeding season at a large spatial scale (c. 200 km), the three species overlapped in their foraging areas located in the vicinity of the colonies but were segregated by their diet and trophic level, as indicated by the different chick δ15N values that increased in the order Cape Petrel < Southern Fulmar < Snow Petrel. During the non-breeding season, the three fulmarines showed species-specific migration strategies along a wide latitudinal gradient. Snow Petrels largely remained in ice-associated Antarctic waters, Southern Fulmars targeted primarily the sub-Antarctic zone and Cape Petrels migrated further north. Overall, birds spent less time in flight during the non-breeding period than during the breeding season, with the highest percentage of time spent sitting on the water occurring during the breeding season and at the beginning of the non-breeding period before migration. This activity pattern, together with the δ13C values of most feathers, strongly suggests that moult of the three fulmarine petrels occurred at that time in the very productive high Antarctic waters, where birds fed on a combination of crustaceans and fish. The study highlights different segregating mechanisms that allow the coexistence of closely related species, specifically, prey partitioning during the breeding season and spatial segregation at sea during the non-breeding season. |
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109 |
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0019-1019 |
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yes |
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Serial |
6495 |
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Author |
De Grissac Sophie, Börger Luca, Guitteaud Audrey, Weimerskirch Henri |
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Title |
Contrasting movement strategies among juvenile albatrosses and petrels |
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Journal Article |
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Year |
2016 |
Publication |
Scientific reports |
Abbreviated Journal |
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Volume |
6 |
Issue |
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Pages |
26103 |
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Abstract |
Animal movement is a fundamental eco-evolutionary process yet the behaviour of juvenile animals is largely unknown for many species, especially for soaring seabirds which can range widely over the oceans at low cost. |
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109 |
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ISSN |
2045-2322 |
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yes |
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Serial |
6494 |
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Author |
Cherel Yves, Quillfeldt Petra, Delord Karine, Weimerskirch Henri |
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Title |
Combination of At-Sea Activity, Geolocation and Feather Stable Isotopes Documents Where and When Seabirds Molt |
Type |
Journal Article |
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Year |
2016 |
Publication |
Frontiers in ecology and the environment |
Abbreviated Journal |
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Volume |
4 |
Issue |
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Pages |
1-16 |
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109 |
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Bachelor's thesis |
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ISSN |
1540-9295 |
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yes |
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Serial |
6493 |
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Author |
Cazau D., Bonnel J., Le Bras Yves, Guinet Christophe |
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Title |
Soundscape analysis in the Southern Ocean using elephant seals as acoustic glider of opportunity. The Journal of the Acoustical Society of America |
Type |
Journal Article |
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Year |
2016 |
Publication |
Journal of the acoustical society of america |
Abbreviated Journal |
0001-4966 |
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Volume |
139 |
Issue |
4 |
Pages |
2226 |
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109 |
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0001-4966 |
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yes |
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6492 |
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Author |
Carravieri Alice, Cherel Yves, Jaeger Audrey, Churlaud Carine, Bustamante Paco |
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Title |
Penguins as bioindicators of mercury contamination in the southern Indian Ocean: geographical and temporal trends |
Type |
Journal Article |
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Year |
2016 |
Publication |
Environmental pollution |
Abbreviated Journal |
Environ. Pollut. |
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Volume |
213 |
Issue |
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Pages |
195-205 |
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Abstract |
Penguins have been recently identified as useful bioindicators of mercury (Hg) transfer to food webs in the Southern Ocean over different spatial and temporal scales. Here, feather Hg concentrations were measured in adults and chicks of all the seven penguin species breeding in the southern Indian Ocean, over a large latitudinal gradient spanning Antarctic, subantarctic and subtropical sites. Hg was also measured in feathers of museum specimens of penguins collected at the same sites in the 1950s and 1970s. Our aim was to evaluate geographical and historical variations in Hg transfer to penguins, while accounting for feeding habits by using the stable isotope technique (δ13C, habitat; δ15N, diet/trophic level). Adult feather Hg concentrations in contemporary individuals ranged from 0.7 ± 0.2 to 5.9 ± 1.9 μg g−1 dw in Adélie and gentoo penguins, respectively. Inter-specific differences in Hg accumulation were strong among both adults and chicks, and mainly linked to feeding habits. Overall, penguin species that feed in Antarctic waters had lower feather Hg concentrations than those that feed in subantarctic and subtropical waters, irrespective of age class and dietary group, suggesting different Hg incorporation into food webs depending on the water mass. While accounting for feeding habits, we detected different temporal variations in feather Hg concentrations depending on species. Notably, the subantarctic gentoo and macaroni penguins had higher Hg burdens in the contemporary rather than in the historical sample, despite similar or lower trophic levels, respectively. Whereas increases in Hg deposition have been recently documented in the Southern Hemisphere, future monitoring is highly needed to confirm or not this temporal trend in penguins, especially in the context of actual changing Hg emission patterns and global warming. |
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109 |
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ISSN |
0269-7491 |
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yes |
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6491 |
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Author |
Bustamante Paco, Carravieri Alice, Goutte Aurélie, Barbraud Christophe, Delord Karine, Chastel Olivier, Weimerskirch Henri, Cherel Yves |
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Title |
High feather mercury concentrations in the wandering albatross are related to sex, breeding status and trophic ecology with no demographic consequences |
Type |
Journal Article |
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Year |
2016 |
Publication |
Environmental research |
Abbreviated Journal |
Environ. Res. |
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Volume |
144, Part A |
Issue |
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Pages |
1-10 |
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Abstract |
Hg can affect physiology of seabirds and ultimately their demography, particularly if they are top consumers. In the present study, body feathers of >200 wandering albatrosses from Possession Island in the Crozet archipelago were used to explore the potential demographic effects of the long-term exposure to Hg on an apex predator. Variations of Hg with sex, age class, foraging habitat (inferred from δ13C values), and feeding habits (inferred from δ15N values) were examined as well as the influence of Hg on current breeding output, long-term fecundity and survival. Wandering albatrosses displayed among the highest Hg feather concentrations reported for seabirds, ranging from 5.9 to 95 µg g−1, as a consequence of their high trophic position (δ15N values). These concentrations fall within the same range of those of other wandering albatross populations from subantarctic sites, suggesting that this species has similar exposure to Hg all around the Southern Ocean. In both immature and adult albatrosses, females had higher Hg concentrations than males (28 vs. 20 µg g−1 dw on average, respectively), probably as a consequence of females foraging at lower latitudes than males (δ13C values). Hg concentrations were higher in immature than in adult birds, and they remained fairly constant across a wide range of ages in adults. Such high levels in immature individuals question (i) the frequency of moult in young birds, (ii) the efficiency of Hg detoxification processes in immatures compared to adults, and (iii) importantly the potential detrimental effects of Hg in early life. Despite very high Hg concentrations in their feathers, neither effects on adults' breeding probability, hatching failure and fledgling failure, nor on adults' survival rate were detected, suggesting that long-term bioaccumulated Hg was not under a chemical form leading to deleterious effects on reproductive parameters in adult individuals. |
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109 |
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0013-9351 |
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yes |
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6490 |
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Author |
Béhagle Nolwenn, Cotté Cédric, Ryan Tim E., Gauthier Olivier, Roudaut Gildas, Brehmer Patrice, Josse Erwan, Cherel Yves |
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Title |
Acoustic micronektonic distribution is structured by macroscale oceanographic processes across 20–50°S latitudes in the South-Western Indian Ocean |
Type |
Journal Article |
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Year |
2016 |
Publication |
Deep-sea research part ii-topical studies in oceanography |
Abbreviated Journal |
Deep Sea Res. Part II Top. Stud. Oceanogr. |
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Volume |
110 |
Issue |
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Pages |
20-32 |
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Abstract |
Micronekton constitutes the largest unexploited marine biomass worldwide. It is one of the most conspicuous and ecologically important components of the still poorly known mesopelagic ecosystem. Acoustic data were collected from both fishing and research vessels along 18 transects for a total of 47 682 linear kilometers to investigate large-scale distribution of micronekton over a long latitudinal gradient (20–50°S) and two contrasted seasons (summer and winter) in the South-Western Indian Ocean. Acoustic backscatter at 38 kHz was used as a proxy of mid-water organisms' abundance (0–800 m depth). Two consistent features were diel vertical migration of backscatters and vertical distribution of micronekton in three distinct layers, namely the surface (SL), intermediate (IL) and deep (DL) layers. Satellite remote sensing data was used to position oceanic fronts, and hence define water masses, from the tropical to low Antarctic zones. A key finding of this study was the significant correlation observed between abundance and distribution of acoustic backscatter and position relative to these front and water masses. Total backscatter peaked in the subtropical zone, with low abundances in the colder Polar Frontal Zone. The high overall abundances in subtropical waters resulted mainly from high backscatters in the IL and DL that contrasted with low SL values, especially during the day (2–11%). The warmer the waters, the higher SL backscatter was, with the highest absolute and relative (38–51% of the total abundance) values observed at night in the Tropical Zone and the lowest abundance in the Antarctic Zone. No significant seasonal pattern was found, but SL backscatters were very low in winter compared to summer in the Polar Frontal Zone. Moreover, the Northern winter shift of the fronts induced a Northern latitudinal shift of the peak in abundance from summer to winter. The present study highlights the value of building large acoustic databases collected from both research and fishing vessels. The method provides unique opportunities to gather basic information on micronekton and is an essential step to describe oceanic zones of relevant biological interest in terms of trophic ecology. |
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109 |
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ISSN |
0967-0645 |
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yes |
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Serial |
6489 |
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Author |
Angelier Frédéric, Wingfield John C., Tartu Sabrina, Chastel Olivier |
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Title |
Does prolactin mediate parental and life-history decisions in response to environmental conditions in birds? A review |
Type |
Journal Article |
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Year |
2016 |
Publication |
Hormones and behavior |
Abbreviated Journal |
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Volume |
77 |
Issue |
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Pages |
18-29 |
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Abstract |
This article is part of a Special Issue “Parental Care”. In vertebrates, adjustments of physiology and behavior to environmental changes are often mediated by central physiological mechanisms, and more specifically by hormonal mechanisms. As a consequence, these mechanisms are thought to orchestrate life-history decisions in wild vertebrates. For instance, investigating the hormonal regulation of parental behavior is relevant to evaluate how parents modulate their effort according to specific environmental conditions. Surprisingly and despite being classically known as the ‘parental hormone’, prolactin has been overlooked in birds relative to this context. Our aim is to review evidence that changes in prolactin levels can mediate, at least to some extent, the response of breeding birds to environmental conditions. To do so, we first examine current evidence and limits for the role of prolactin in mediating parental behavior in birds. Second, we emphasize the influence of environmental conditions and stressors on circulating prolactin levels. In addition, we review to what extent prolactin levels are a reliable predictor of breeding success in wild birds. By linking environmental conditions, prolactin regulation, parental behavior, and breeding success, we highlight the potential role of this hormone in mediating parental decisions in birds. Finally, we also review the potential role of prolactin in mediating other life history decisions such as clutch size, re-nesting, and the timing of molt. By evaluating the influence of stressors on circulating prolactin levels during these other life-history decisions, we also raise new hypotheses regarding the potential of the prolactin stress response to regulate the orchestration of the annual cycle when environmental changes occur. To sum up, we show in this review that prolactin regulation has a strong potential to allow ecological physiologists to better understand how individuals adjust their life-history decisions (clutch size, parental behavior, re-nesting, and onset of molt) according to the environmental conditions they encounter and we encourage further research on that topic. |
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0018-506X |
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yes |
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6488 |
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Author |
Le Vaillant Maryline, Ropert-Coudert Yan, Le Maho Yvon, Le Bohec Céline |
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Title |
Individual parameters shape foraging activity in breeding king penguins |
Type |
Journal Article |
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Year |
2016 |
Publication |
Behavioral ecology |
Abbreviated Journal |
Behav. Ecol. |
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Volume |
27 |
Issue |
1 |
Pages |
352-362 |
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Abstract |
The variability in individual fitness within a population is likely to be mediated through individual foraging ability and tactics, themselves linked to age- or experience-related processes, but also to differences in individual quality. Not only age, experience, and quality but also sex-related foraging strategies should particularly play an important role in long-lived central-place foragers that have to cope with strong environmental constraints. We monitored the foraging effort (foraging trip durations and number of trips) of 262 known-age micro-tagged king penguins, Aptenodytes patagonicus, at different breeding stages during one of their breeding cycles. We investigated how their age (4–11 years old), sex, past breeding experience (the number of successful breeding attempts), and breeding quality (the expected breeding success, corresponding to the residual of the linear relationship between the age and on the number of past breeding success divided by the number of breeding attempts) affected foraging over a whole breeding season. During the incubation, younger birds (4 years old) undertook longer foraging trips compared with older ones. During the brooding phase and the second period of the crèching phase, more experienced birds performed shorter foraging trip than those with a low breeding experience, whereas, during the first period of the crèching phase, individuals with better breeding quality performed shorter foraging trips at sea than low breeding quality individuals. Sex-specific foraging patterns were also observed depending on the period of the breeding cycle. Our study shows, for the first time, how foraging effort can be driven by a complex interplay of several individual parameters according to breeding stage and resource availability and abundance. |
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137 |
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1045-2249 |
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yes |
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6487 |
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