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Author ![sorted by Author field, ascending order (up)](img/sort_asc.gif) |
Aurore Ponchon, Rémi Choquet, Jérémy Tornos, Karen D. McCoy, Torkild Tveraa, Thierry Boulinier |
![find book details (via ISBN) isbn](img/isbn.gif)
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Title |
Survival estimates strongly depend on capture–recapture designs in a disturbed environment inducing dispersal |
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Journal |
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Year |
2018 |
Publication |
Ecography |
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Volume |
41 |
Issue |
12 |
Pages |
2055-2066 |
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Keywords |
demography environmental disturbance individual behaviour |
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Abstract |
Capture–recapture (CR) approaches are extensively used to estimate demographic parameters. Their robustness relies on the selection of suitable statistical models, but also on the sampling design and effort deployed in the field. In colonial or territorial species showing breeding site fidelity, recurrent local perturbations, such as predation-induced breeding failure, may lead individuals to disperse locally or regionally. This might induce heterogeneity in individual CR histories and biases in demographic parameter estimates. Here, we assessed the effect of buffer areas and multi-site designs on annual survival estimate accuracy and precision. First, using simulated data with and without a multi-site design, we compared survival estimates for different scenarios involving contrasted local and regional dispersal. Then, using data from a local multi-site long-term monitoring survey carried out in a colony of black-legged kittiwakes, we tested the homogeneity of individual CR histories and compared survival estimates from three datasets including one or several breeding cliffs with or without buffer areas. Results from simulations highlighted that a single-site design consistently led to underestimated or less precise survival values compared to a multi-site design. Similarly, a multi-site design allowed detecting significant temporal trends while a single-site one did not. In the field-based study, adding buffer areas reduced individual heterogeneity, but all three datasets suffered from strong trap-dependence possibly due to individual breeding success affecting nest-site fidelity. Implementing a multi-site design significantly improved the accuracy and precision of annual survival estimates, regardless of CR models applied. Adapting the spatial scale of sampling design to the local environment and species behaviour is essential to provide robust parameters of key relevance for population monitoring and management. We show that implementing buffer areas and/or multi-site designs may be especially beneficial for long-lived species facing regular local perturbation events leading to local dispersal. |
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333 |
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1600-0587 |
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1600-0587 |
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yes |
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7418 |
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Author ![sorted by Author field, ascending order (up)](img/sort_asc.gif) |
Authier M, Cam E, Guinet C, |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Selection for increased body length in Subantarctic fur seals on Amsterdam Island
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Journal Article |
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Year |
2011 |
Publication |
Journal of Evolutionary Biology |
Abbreviated Journal |
J. Evol. Biol. |
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Volume |
24 |
Issue |
3 |
Pages |
607-616 |
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Keywords |
Bayesian, pinnipeds, quantitative genetics, selection, |
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Abstract |
The traditional distinction between ecological and evolutionary times is eroding, calling for tighter links between ecology and evolution. An example of such a brigde between the two disciplines is the so-called animal model, a methodology initially developed by animal breeders, which has become very popular among ecologists studying contemporary microevolution. Using a Bayesian multi-trait animal model, we investigated the quantitative genetics of body size, a fitness-related trait, in Subantarctic fur seals (Arctocephalus tropicalis) breeding on Amsterdam Island, Southern Ocean. Our approach jointly modelled the growth and selection processes at work in this population. Body length is heritable for both sexes, and females are under selection for increased body length in this population. We strongly suspect the peculiar ecological context of impoverished, suitable prey availability exacerbated by density-dependence phenomena to be an important selective agent on females breeding on Amsterdam Island.
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109 |
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Bachelor's thesis |
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Blackwell Publishing Ltd |
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1420-9101 |
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yes |
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3252 |
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Author ![sorted by Author field, ascending order (up)](img/sort_asc.gif) |
Authier M. |
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Title |
Écologie en mer des éléphants de mer Austraux au travers des isotopes stables du carbone et de l’azote. |
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2011 |
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109 |
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Bachelor's thesis |
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yes |
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1893 |
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Author ![sorted by Author field, ascending order (up)](img/sort_asc.gif) |
Authier Matthieu, Bentaleb Ilham, Ponchon Aurore, Martin Céline, Guinet Christophe, |
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Title |
Foraging Fidelity as a Recipe for a Long Life: Foraging Strategy and Longevity in Male Southern Elephant Seals
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Journal Article |
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Year |
2012 |
Publication |
PLoS ONE |
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Volume |
7 |
Issue |
4 |
Pages |
e32026- |
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Identifying individual factors affecting life-span has long been of interest for biologists and demographers: how do some individuals manage to dodge the forces of mortality when the vast majority does not? Answering this question is not straightforward, partly because of the arduous task of accurately estimating longevity in wild animals, and of the statistical difficulties in correlating time-varying ecological covariables with a single number (time-to-event). Here we investigated the relationship between foraging strategy and life-span in an elusive and large marine predator: the Southern Elephant Seal (Mirounga leonina). Using teeth recovered from dead males on îles Kerguelen, Southern Ocean, we first aged specimens. Then we used stable isotopic measurements of carbon () in dentin to study the effect of foraging location on individual life-span. Using a joint change-point/survival modelling approach which enabled us to describe the ontogenetic trajectory of foraging, we unveiled how a stable foraging strategy developed early in life positively covaried with longevity in male Southern Elephant Seals. Coupled with an appropriate statistical analysis, stable isotopes have the potential to tackle ecological questions of long standing interest but whose answer has been hampered by logistic constraints.
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109 |
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Public Library of Science |
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1932-6203 |
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yes |
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3861 |
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Author ![sorted by Author field, ascending order (up)](img/sort_asc.gif) |
Authier Matthieu, Delord Karine, Guinet Christophe, |
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Title |
Population trends of female Elephant Seals breeding on the Courbet Peninsula, îles Kerguelen
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Type |
Journal Article |
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Year |
2011 |
Publication |
Polar Biology |
Abbreviated Journal |
Polar Biol. |
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Volume |
34 |
Issue |
3 |
Pages |
319-328 |
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Keywords |
Biomedical and Life Sciences, |
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Abstract |
Southern Elephant Seals are upper marine predators of the Southern Ocean. As such, their population dynamics and fluctuations reflect environment conditions. Their worldwide populations crashed during the second half of the twentieth century for reasons not yet completely elucidated. Here, we studied the largest population of Southern Elephant Seals within the South Indian Ocean that are breeding on îles Kerguelen. In a previous analysis, Guinet et al. in Antarct Sci 11:193197, 1999) suggested that the decline on îles Kerguelen might be over, as observed elsewhere. Using 10 years of additional data, we updated this analysis using state-of-the-art statistical methods to account for most uncertainties associated with count data. We showed that the population of female Southern Elephant Seals breeding on îles Kerguelen has been stable over the past 20 years. Despite concomitant global changes within the Southern Ocean, we did not find any evidence of a phenological shift in peak haul-out date of breeding females between the 1970s and the 2000s. |
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109 |
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Springer Berlin / Heidelberg |
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0722-4060 |
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yes |
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2720 |
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Author ![sorted by Author field, ascending order (up)](img/sort_asc.gif) |
Authier Matthieu, Dragon Anne-Cécile, Cherel Yves, Guinet Christophe, |
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Title |
How large is large: estimating ecologically meaningful isotopic differences in observational studies of wild animals
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Journal Article |
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Year |
2012 |
Publication |
RAPID COMMUNICATIONS IN MASS SPECTROMETRY |
Abbreviated Journal |
0951-4198 |
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26 |
Issue |
23 |
Pages |
2657-2664 |
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Keywords |
Animal Migration, Animals, Animals, Wild, Antarctic Regions, Carbon Isotopes, Feeding Behavior, Mass Spectrometry, Regression Analysis, Sample Size, Seals, Earless, Seasons, |
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Abstract |
RATIONALE: In ecological studies of wildlife movements and foraging, bio-logging and isotopic data are routinely collected and increasingly analyzed in tandem. Such analyses have two shortcomings: (1) small sample size linked with the number of telemetric tags that can be deployed, and (2) the observational nature of isotopic gradients. Wildlife ecologists are thus put in a statistical conundrum known as the small n, large p problem. |
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109 |
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1097-0231 |
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yes |
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4260 |
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Author ![sorted by Author field, ascending order (up)](img/sort_asc.gif) |
Authier Matthieu, Dragon Anne-Cécile, Richard Pierre, Cherel Yves, Guinet Christophe, |
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Title |
O' mother where wert thou? Maternal strategies in the southern elephant seal: a stable isotope investigation
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Journal Article |
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Year |
2012 |
Publication |
Proceedings of the Royal Society B: Biological Sciences |
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279 |
Issue |
1738 |
Pages |
2681 -2690 |
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Abstract |
Maternal effects are widespread in ecology and can alter the dynamics of a population. We investigated the impact of maternal foraging strategies on offspring weaning massa proxy of maternal foraging success and of offspring survivalin southern elephant seals on îles Kerguelen. Using 4 years of data, we modelled pup weaning mass as a two-component mixture and used blood stable isotope values to discriminate between maternal foraging strategies previously identified from bio-logging studies. Carbon isotope ratio was a strong predictor of weaning mass, but the relationship was non-monotonic in contrast to a priori expectations. Females foraging in the interfrontal zone weaned pups with a smaller mass compared with females foraging in Antarctic waters. Pup mass was positively correlated with a proxy of global primary production in the interfrontal zone for small weanlings. Maternal effects, via a poor foraging efficiency in the 1970s, may help explain the large population decrease observed at that time on îles Kerguelen because of an overall decrease in pup weaning mass, survival and subsequent recruitment.
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109 |
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0962-8452 |
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yes |
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3862 |
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Author ![sorted by Author field, ascending order (up)](img/sort_asc.gif) |
Authier Matthieu, Martin Céline, Ponchon Aurore, Steelandt Stephanie, Bentaleb Ilham, Guinet Christophe, |
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Title |
Breaking the sticks: a hierarchical change-point model for estimating ontogenetic shifts with stable isotope data
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Type |
Journal Article |
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Year |
2012 |
Publication |
Methods in Ecology and Evolution |
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3 |
Issue |
2 |
Pages |
281-290 |
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Bayesian methods, linear models, modelling, population ecology, statistics, |
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1.Stable isotopes are increasingly used in ecology to investigate ontogenetic shifts in foraging habitat (via 13C) and in trophic level (via 15N). These shifts are in essence an individual-level phenomenon, requiring repeated measures throughout the life of individuals, i.e. longitudinal data. Longitudinal data require in turn specifying an appropriate covariance structure. Here we present a hierarchical model to jointly investigate individual ontogenetic shifts in 13C and 15N values. 2.In a Bayesian framework, we used a Cholesky decomposition for estimating a moderately-sized covariance matrix, thereby directly estimating correlations between parameters describing time-series of isotopic measurements. We offer guidelines on how to select the covariance structure. 3.The approach is illustrated with a hierarchical change-point (or broken stick) model applied to a data set collected on Southern Elephant Seals, Mirounga leonina. Ontogenetic shifts in foraging habitat, following a juvenile and variable stage, were detected and interpreted as fidelity to a foraging strategy; while ontogenetic shifts in trophic level were more likely the result of complete independence from maternal resources followed by a gradual increase in trophic level as seals aged. 4.Specifying both an appropriate covariance and mean structure enabled us to draw strong inferences on the ecology of an elusive marine predator, and has wide applicability for isotopic ecology provided repeated isotopic measurements are available.
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109 |
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Blackwell Publishing Ltd |
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2041-210X |
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yes |
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3863 |
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Author ![sorted by Author field, ascending order (up)](img/sort_asc.gif) |
AUVINET J., BELKADI L., BONILLO C., COUTANCEAU J.P., DETTAI Agnès, GUIDI-RONTANI C., GRACA P., HIGUET D. & OZOUF-COSTAZ C. |
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Accumulation de rétrotransposons et remaniements chromosomiques extensifs au cours de la diversification des Trematominae, téléostéens antarctiques. Poster. VIe Rencontres de l'Ichtyologie en France, Paris, 24-27 mars 2015 |
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Conference - International - Article with Reading Comitee |
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2015 |
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6197 |
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Author ![sorted by Author field, ascending order (up)](img/sort_asc.gif) |
Auzende J.M., Hey R.N., Pelletier B., Rouland D., Lafoy Y., Racia E. & Huchon P. |
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Propagation rift West of the Fidji Archipelago (North Fidji Basin , S.W.Pacific). |
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Journal Article |
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1995 |
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Journal of geophysical research-atmospheres |
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J. Geophys. Res. |
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100 |
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17823-17835 |
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133 |
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0148-0227 |
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942 |
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