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Author |
Fossat E. |
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Title  |
What we have learned in more than 10 years of site testing at Concordia |
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Book Chapter |
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Year |
2019 |
Publication |
5th Workshop of the SCAR AAA, 17-19 June 2019, Skyway Mont Blanc |
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1066 |
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Bachelor's thesis |
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yes |
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7810 |
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Author |
Catherine Larose |
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Title |
What shapes communities in snow? |
Type |
Peer-reviewed symposium |
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Year |
2019 |
Publication |
8th international Conference on Polar & Alpine Microbiology, 4-8 Feb 2019, hamilton, new zealand |
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1192 |
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yes |
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7566 |
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Author |
Pardo Deborah, Barbraud Christophe, Weimerskirch Henri, |
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Title |
What shall I do now? State-dependent variations of life-history traits with aging in Wandering Albatrosses
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Type |
Journal Article |
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Year |
2014 |
Publication |
Ecology and Evolution |
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Volume |
4 |
Issue |
4 |
Pages |
474-487 |
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Keywords |
Bienniality, breeding probability and success, cost of reproduction, Diomedea exulans, failure, survival., |
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Abstract |
Allocation decisions depend on an organism's condition which can change with age. Two opposite changes in life-history traits are predicted in the presence of senescence: either an increase in breeding performance in late age associated with terminal investment or a decrease due to either life-history trade-offs between current breeding and future survival or decreased efficiency at old age. Age variation in several life-history traits has been detected in a number of species, and demographic performances of individuals in a given year are influenced by their reproductive state the previous year. Few studies have, however, examined state-dependent variation in life-history traits with aging, and they focused mainly on a dichotomy of successful versus failed breeding and non-breeding birds. Using a 50-year dataset on the long-lived quasi-biennial breeding wandering albatross, we investigated variations in life-history traits with aging according to a gradient of states corresponding to potential costs of reproduction the previous year (in ascending order): non-breeding birds staying at sea or present at breeding grounds, breeding birds that failed early, late or were successful. We used multistate models to study survival and decompose reproduction into four components (probabilities of return, breeding, hatching, and fledging), while accounting for imperfect detection. Our results suggest the possible existence of two strategies in the population: strict biennial breeders that exhibited almost no reproductive senescence and quasi-biennial breeders that showed an increased breeding frequency with a strong and moderate senescence on hatching and fledging probabilities, respectively. The patterns observed on survival were contrary to our predictions, suggesting an influence of individual quality rather than trade-offs between reproduction and survival at late ages. This work represents a step further into understanding the evolutionary ecology of senescence and its relationship with costs of reproduction at the population level. It paves the way for individual-based studies that could show the importance of intra-population heterogeneity in those processes.
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109 |
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ISSN |
2045-7758 |
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yes |
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5073 |
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Title |
What is the menu today in a subantarctic kelp food web from the Kerguelen Islands? Phytodetritus, phytoplankton and phytobenthos; not living kelp |
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Journal |
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Year |
2022 |
Publication |
Marine Biology |
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Volume |
169 |
Issue |
9 |
Pages |
118 |
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Keywords |
Benthic communities Food web Kelp forests Mixing models Stable isotopes |
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Abstract |
Kelp forests dominated by Macrocystis pyrifera are widely distributed in coastal waters from boreal, temperate and subantarctic regions. This widespread distribution may result in regional differences in food web structure and functioning. In temperate northern regions, where most studies on kelp forest benthic food webs have been conducted, kelp grazing is a well-documented phenomenon and can lead to the overgrazing of M. pyrifera by sea urchins when their predators (e.g., sea otters) are absent. In contrast, little is known about their counterparts in subantarctic areas. The present study aimed to reconstruct the benthic food web of a kelp forest dominated by M. pyrifera in a subantarctic environment using stable isotope analysis. Stable carbon (?13C), nitrogen (?15N) and sulfur (?34S) isotope ratios were measured from food sources (macrophytobenthos, suspended particulate organic matter SPOM, and sediment) and consumers (sponges, bivalves, gastropods, sedentary and mobile polychaetes, arthropods and echinoderms) which were sampled in a kelp forest of the Kerguelen archipelago. Mixing models highlighted two interconnected trophic pathways which were either supported by SPOM and resuspended macrophytobenthos detritus (bentho-pelagic), or by live micro/macrophytobenthos (phytobenthos-based). No major prey were highlighted for several consumers, indicating the existence of potential supplementary trophic pathways. No consumer relying primarily on living M. pyrifera was highlighted by the mixing models. The investigated kelp forest is hence a complex ecosystem supporting multiple trophic pathways, and direct consumption of M. pyrifera is limited. Nonetheless, M. pyrifera and other macrophytobenthos species may constitute a pool of detritus supporting several trophic pathways. |
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1044 |
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ISSN |
1432-1793 |
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yes |
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Serial |
8474 |
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Type |
Conference - International - Communication |
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Year |
2017 |
Publication |
12th SCAR biology symposium, 10-14 July 2017, Leuven, Belgium |
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Programme |
1091 |
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Bachelor's thesis |
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yes |
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Serial |
6871 |
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Author |
Souchez R., Jean Baptiste P., Petit J.R., Lipenkov V.Y. & Jouzel J. |
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Title |
What is the deepest part of the Vostok ice core is telling us? |
Type |
Journal Article |
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Year |
2002 |
Publication |
Earth-science reviews |
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Volume |
60 |
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Pages |
131-146 |
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355 |
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ISSN |
0012-8252 |
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yes |
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2610 |
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Title |
What factors drive prolactin and corticosterone responses to stress in a long-lived bird species (snow petrel Pagodroma nivea)?
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Type |
Journal Article |
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Year |
2009 |
Publication |
Physiological and biochemical zoology : PBZ |
Abbreviated Journal |
Physiol. Biochem. Zool. |
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Volume |
82 |
Issue |
5 |
Pages |
590 -602 |
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Keywords |
Adrenal Glands, Adrenal Glands: drug effects, Adrenal Glands: secretion, Adrenocorticotropic Hormone, Adrenocorticotropic Hormone: administration & dosa, Adrenocorticotropic Hormone: secretion, Animals, Behavior, Animal, Birds, Birds: blood, Birds: physiology, Breeding, Corticosterone, Corticosterone: blood, Corticosterone: secretion, Female, Longevity, Male, Models, Biological, Prolactin, Prolactin: blood, Prolactin: secretion, Reproduction, Sex Characteristics, Stress, Physiological, |
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Abstract |
Life-history theory predicts that individuals should adapt their parental investment to the costs and benefits of the current reproductive effort. This could be achieved by modulating the hormonal stress response, which may shift energy investment away from reproduction and redirect it toward survival. In birds, this stress response consists of a release of corticosterone that may be accompanied by a decrease in circulating prolactin, a hormone involved in the regulation of parental care. We lack data on the modulation of the prolactin stress response. In this study, we tested the hypothesis that individuals should modulate their prolactin stress response according to the fitness value of the current reproductive effort relative to the fitness value of future reproduction. Specifically, we examined the influence of breeding status (failed breeders vs. incubating birds) and body condition on prolactin and corticosterone stress responses in a long-lived species, the snow petrel Pagodroma nivea. When facing stressors, incubating birds had higher prolactin levels than failed breeders. However, we found no effect of body condition on the prolactin stress response. The corticosterone stress response was modulated according to body condition but was not affected by breeding status. We also performed an experiment using injections of adrenocorticotropic hormone (ACTH) and found that the modulation of the corticosterone stress response was probably associated with a reduction in ACTH release by the pituitary and a decrease in adrenal sensitivity to ACTH. In addition, we examined whether prolactin and corticosterone secretion were functionally linked. We found that these two hormonal stress responses were not correlated. Moreover, injection of ACTH did not affect prolactin levels, demonstrating that short-term variations in prolactin levels are not governed directly or indirectly by ACTH release. Thus, we suggest that the corticosterone and prolactin responses to short-term stressors are independent and may therefore mediate some specific components of parental investment in breeding birds. With mounting evidence, we suggest that examining both corticosterone and prolactin stress responses could be relevant to parental investment in vertebrates.
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Programme |
109 |
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ISSN |
1522-2152 |
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yes |
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Call Number |
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Serial |
2219 |
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Author |
Landais A, Dreyfus G, Capron E, Masson-Delmotte V, Sanchez-Goi MF, Desprat S, Hoffmann G, Jouzel J, Leuenberger M, Johnsen S, |
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Title |
What drives the millennial and orbital variations of δ18Oatm?
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Journal Article |
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Year |
2010 |
Publication |
Quaternary Science Reviews |
Abbreviated Journal |
Quat Sci Rev |
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29 |
Issue |
1-2 |
Pages |
235 -246 |
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Abstract |
The isotopic composition of atmospheric oxygen (δ18Oatm) is a complex marker that integrates changes in global sea-level, water cycle, and biosphere productivity. A strong signature of orbital precession has been identified leading to the use of low-resolution measurements of δ18Oatm to date ice core records. However, the drivers of these δ18Oatm variations are still poorly known. Here, we combine records of millennial and orbital scale variations on the NorthGRIP, Vostok, and EPICA Dome C (EDC) ice cores to explore the origin of δ18Oatm variations. We show that, superimposed on the dominant precession signal, millennial δ18Oatm variations record systematic decreases during warm phases of the Dansgaard-Oeschger events and systematic increases during the cold phases.
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458 |
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0277-3791 |
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yes |
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2713 |
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Author |
Say L., Pontier |
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Title |
What determines testis size in the domestic cat (Felis catus L.). |
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Journal Article |
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Year |
2006 |
Publication |
Biology letters |
Abbreviated Journal |
Biol. Lett. |
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43 |
Issue |
1 |
Pages |
5-14 |
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279 |
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1744-9561 |
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yes |
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3400 |
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Author |
Delille B., Schoemann V., Lancelot C., Lannuzel D., De Jong J.T.M., Tilbrook B., Delille D., Borges A.V. & Tison J.-L. |
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Title |
What controls pCO2 dynamics in Antarctic sea ice and related air-ice CO2 fluxes ? |
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Conference - International - Poster |
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Year |
2005 |
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International Glaciological Society Symposium on S |
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193 |
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yes |
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3923 |
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