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Author |
Pardo Deborah, Barbraud Christophe, Authier Matthieu, Weimerskirch Henri, |
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Title |
Evidence for an age-dependent influence of environmental variations on a long-lived seabird's life-history traits
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Journal Article |
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Year |
2013 |
Publication |
ECOLOGY |
Abbreviated Journal |
Ecology |
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Volume |
94 |
Issue |
1 |
Pages |
208-220 |
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Keywords |
Aging, Animals, Charadriiformes, Ecosystem, Population Dynamics, Reproduction, |
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Abstract  |
Theoretical and empirical studies have highlighted the effects of age on several life-history traits in wild populations. There is also increasing evidence for environmental effects on their demographic traits. However, quantifying how individuals differentially respond to environmental variations according to their age remains a challenge in ecology. In a population of Black-browed Albatrosses monitored during 43 years, we analyzed how life-history traits varied according to age, and whether individuals of different ages responded in different ways to environmental conditions. To do so, we: (1) examined how age affected seven life-history traits, (2) investigated differences in temporal variance of demographic traits between age classes, and (3) tested for age-dependent effects of climate and fisheries covariates on demographic traits. Overall, there was a tendency for traits to improve during the first years of life (5-10 years), to peak and remain stable at middle age (10-30 years), and decline at old ages. At young ages, survival and reproductive parameters increased, except offspring body condition at fledging, suggesting that younger parents had already acquired good foraging capacities. However, they suffered from inexperience in breeding as suggested by their higher breeding failures during incubation. There was evidence for reproductive and actuarial senescence. In particular, breeding success and offspring body condition declined abruptly, suggesting altered foraging capacities of old individuals. Middle-aged individuals had the lowest temporal variance of demographic traits. Although this is predicted by the theory of environmental canalization, it could also results from a higher susceptibility of young and old birds due to their respective inexperience and senescence. The highest temporal variances were found in old individuals. Survival was significantly influenced by sea surface temperatures in the foraging zone of this albatross population during breeding. During warm events survival of young and old individuals improved, whereas a decrease was observed for middle-aged individuals. Presumably, during cold years with poor environmental conditions, young and old breeding birds may suffer more from intraspecific competition for resources than middle-aged individuals. This study showed that age, known as a major factor structuring demography in long-lived species, can also potentially influence the response of populations to global change. |
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109 |
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0012-9658 |
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yes |
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4407 |
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Title |
Impact of ocean acidification on a key Arctic pelagic mollusc (Limacina helicina). |
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Journal Article |
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Year |
2009 |
Publication |
BIOGEOSCIENCES |
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Volume |
6 |
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Pages |
1877-1882 |
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Abstract |
Thecosome pteropods (shelled pelagic molluscs) can play an important role in the food web of various ecosystems
and play a key role in the cycling of carbon and carbonate. Since they harbor an aragonitic shell, they could be
very sensitive to ocean acidification driven by the increase of anthropogenic CO2 emissions. The impact of changes in
the carbonate chemistry was investigated on Limacina helicina, a key species of Arctic ecosystems. Pteropods were kept
in culture under controlled pH conditions corresponding to pCO2 levels of 350 and 760μatm. Calcification was estimated using a fluorochrome and the radioisotope 45Ca. It exhibits a 28% decrease at the pH value expected for 2100
compared to the present pH value. This result supports the concern for the future of pteropods in a high-CO2 world, as
well as of those species dependent upon them as a food resource.
A decline of their populations would likely cause
dramatic changes to the structure, function and services of
polar ecosystems. |
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1008 |
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1726-4170 |
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yes |
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5983 |
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Title |
Photometric results of the ? Pictoris b Hill sphere transit as observed by bRing, ASTEP, BRITE, and the HST |
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Communication |
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Year |
2019 |
Publication |
American Astronomical Society, AAS Meeting #233 |
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140.22 |
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The ? Pictoris b Hill Sphere transit occurred between early-2017 and early-2018. During this event, high precision, high cadence photometry of ? Pictoris was obtained by the bRing (? Pictoris b Ring) and ASTEP (Antarctic Search for Transiting ExoPlanets) ground-based observatories, the BRITE (Bright Target Explorer) satellite, and the HST (Hubble Space Telescope). The data from each source were combined and analyzed to search for evidence of occultation of the star by circumplanetary matter. While the star's pulsations were detected, none of the surveys detected any unexplained fluctuations, which might have been due to circumplanetary matter. This poster presents the overall light curve of ? Pictoris during the Hill sphere transit and presents preliminary estimates of upper limits on the amount of circumplanetary dust at a wide range of orbital radii around the exoplanet ? Pictoris b. |
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1066 |
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yes |
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7814 |
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Title |
Human evolution in Siberia: from frozen bodies to ancient DNA.
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Journal Article |
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Year |
2010 |
Publication |
BMC evolutionary biology |
Abbreviated Journal |
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Volume |
10 |
Issue |
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Pages |
25 -25 |
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Keywords |
Animals, Biological Evolution, Cell Nucleus, Cell Nucleus: genetics, Chromosomes, Human, Y, Chromosomes, Human, Y: genetics, DNA, DNA, Mitochondrial, DNA, Mitochondrial: genetics, DNA: genetics, Female, Genetics, Population, Humans, Male, Siberia, |
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Abstract |
The Yakuts contrast strikingly with other populations from Siberia due to their cattle- and horse-breeding economy as well as their Turkic language. On the basis of ethnological and linguistic criteria as well as population genetic studies, it has been assumed that they originated from South Siberian populations. However, many questions regarding the origins of this intriguing population still need to be clarified (e.g. the precise origin of paternal lineages and the admixture rate with indigenous populations). This study attempts to better understand the origins of the Yakuts by performing genetic analyses on 58 mummified frozen bodies dated from the 15th to the 19th century, excavated from Yakutia (Eastern Siberia).
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1038 |
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ISSN |
1471-2148 |
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yes |
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Serial |
2688 |
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Author |
Sanne Muis, Maialen Irazoqui Apecechea, Job Dullaart, Joao de Lima Rego, Kristine Skovgaard Madsen, Jian Su, Kun Yan, Martin Verlaan |
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Title |
A High-Resolution Global Dataset of Extreme Sea Levels, Tides, and Storm Surges, Including Future Projections |
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Journal |
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Year |
2020 |
Publication |
Frontiers in Marine Science |
Abbreviated Journal |
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Volume |
7 |
Issue |
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Pages |
263 |
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688 |
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2296-7745 |
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yes |
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8031 |
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Author |
Philip L. Woodworth |
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Title |
The global distribution of the M1 ocean tide |
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Journal |
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Year |
2019 |
Publication |
Ocean Science |
Abbreviated Journal |
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Volume |
15 |
Issue |
2 |
Pages |
431-442 |
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Abstract |
The worldwide distribution of the small degree-3 M1 ocean tide is investigated using a quasi-global data set of over 800 tide gauge records and a global tide model. M1 is confirmed to have a geographical variation in the Atlantic consistent with the suggestion of Platzman (1984b) and Cartwright (1975) that M1 is generated in the ocean as a consequence of the spatial and temporal overlap of M1 in the tidal potential and one (or at least a small number of) diurnal ocean normal mode(s). As a consequence, it is particularly strong around the UK and on North Sea coasts (amplitudes ?10?mm). This analysis shows that their suggestion is also consistent to a great extent with the observed small amplitudes in the Pacific and Indian oceans. However, there are differences at the regional and local level which require much further study via more sophisticated ocean tidal modelling. By contrast, what is called the M1' tide (a combination of several degree-2 lines in the tidal potential with frequencies close to that of M1) is shown to have a geographical distribution consistent with expectations from other degree-2 diurnal tides, apart from locations such as around the UK where tidal interactions introduce complications. As far as I know, this is the first time that these small tidal constituents have been mapped on a global basis and, in particular, the first time that the ocean response to the degree-3 component of the tidal potential has been investigated globally. |
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688 |
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1812-0784 |
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8615 |
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Author |
Mathieu Barrere, Florent Domine, Maria Belke-Brea, Denis Sarrazin |
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2018 |
Publication |
Journal of Climate |
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31 |
Issue |
23 |
Pages |
9507-9518 |
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1042 |
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0894-8755 |
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0894-8755 |
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7512 |
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Author |
Delmonte B., Petit J.R., Basile Doelsch I., Lipenkov V.Y.a. & Maggi V. |
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Title |
First characterization and dating of East Antarctic bedrock inclusions from subglacial Lake Vostok acccreted ice. |
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Journal Article |
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Year |
2004 |
Publication |
Environmental chemistry |
Abbreviated Journal |
Environ. Chem. |
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1 |
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1-5 |
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355 |
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1448-2517 |
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yes |
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2605 |
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Journal Article |
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Year |
2012 |
Publication |
Polar Record |
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48 |
Issue |
Special Issue 01 |
Pages |
2-10 |
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Keywords |
KW |
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304 |
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0032-2474 |
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yes |
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4005 |
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2012 |
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Polar Record |
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48 |
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1 |
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2-10 |
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1108 |
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1475-3057, 0032-2474 |
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1475-3057, 0032-2474 |
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6968 |
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