Check out my profile on Research Gate and on Google Scholar or explore my full publication list below. Most papers are available online through the public repository at HAL CNRS
2020
2.
Thomas Tully; Jean-François Le Galliard; Jean-Pierre Baron
Micro-geographic shift between negligible and actuarial senescence in a wild snake Journal Article
In: Journal of Animal Ecology, vol. 89, no. 11, pp. 2704-2716, 2020.
Abstract | Links | BibTeX | Tags: ageing, life-history trade-off, phenotypic plasticity, reproductive effort, survival
@article{https://doi.org/10.1111/1365-2656.13317,
title = {Micro-geographic shift between negligible and actuarial senescence in a wild snake},
author = {Thomas Tully and Jean-François Le Galliard and Jean-Pierre Baron},
url = {https://besjournals.onlinelibrary.wiley.com/doi/abs/10.1111/1365-2656.13317},
doi = {https://doi.org/10.1111/1365-2656.13317},
year = {2020},
date = {2020-01-01},
journal = {Journal of Animal Ecology},
volume = {89},
number = {11},
pages = {2704-2716},
abstract = {Abstract While it has long been known that species have contrasted life expectancy (pace of mortality) and generation time (pace of reproduction), recent studies have also uncovered that the shape of adult age trajectories of mortality and reproduction can vary remarkably among species along a continuum of senescence ranging from strong deterioration (senescence), insignificant deterioration (negligible senescence) to improvement with advancing age (negative senescence). As for many long-lived ectotherms with asymptotic growth and increasing reproductive output with age, snakes are good candidates for negligible senescence to occur. Yet, intraspecific variation in the pace and shape of actuarial and reproductive senescence across wild populations of these species remains to be explored. Here, we used 37 years of mark–recapture data in two nearby habitats inside a meadow viper Vipera ursinii population to quantify life expectancies, generation times and the shape of actuarial and reproductive senescence. Female vipers maintained stable reproductive performances at old ages, even when accounting for the predicted increase of fertility with body size, providing evidence for negligible reproductive senescence in both habitats. Males had a higher adult mortality and a shorter life expectancy on average than females and actuarial senescence shifted from negligible senescence in the optimal habitat to strong senescence in the sub-optimal habitat. Overall, these results demonstrate that micro-geographic environmental variation can generate qualitative shifts in actuarial senescence patterns. This highlights that taking into account the within-species plasticity of age-dependent trajectories could prove useful in better understanding what determines the evolution of life-history age trajectories.},
keywords = {ageing, life-history trade-off, phenotypic plasticity, reproductive effort, survival},
pubstate = {published},
tppubtype = {article}
}
Abstract While it has long been known that species have contrasted life expectancy (pace of mortality) and generation time (pace of reproduction), recent studies have also uncovered that the shape of adult age trajectories of mortality and reproduction can vary remarkably among species along a continuum of senescence ranging from strong deterioration (senescence), insignificant deterioration (negligible senescence) to improvement with advancing age (negative senescence). As for many long-lived ectotherms with asymptotic growth and increasing reproductive output with age, snakes are good candidates for negligible senescence to occur. Yet, intraspecific variation in the pace and shape of actuarial and reproductive senescence across wild populations of these species remains to be explored. Here, we used 37 years of mark–recapture data in two nearby habitats inside a meadow viper Vipera ursinii population to quantify life expectancies, generation times and the shape of actuarial and reproductive senescence. Female vipers maintained stable reproductive performances at old ages, even when accounting for the predicted increase of fertility with body size, providing evidence for negligible reproductive senescence in both habitats. Males had a higher adult mortality and a shorter life expectancy on average than females and actuarial senescence shifted from negligible senescence in the optimal habitat to strong senescence in the sub-optimal habitat. Overall, these results demonstrate that micro-geographic environmental variation can generate qualitative shifts in actuarial senescence patterns. This highlights that taking into account the within-species plasticity of age-dependent trajectories could prove useful in better understanding what determines the evolution of life-history age trajectories.
2009
1.
Katrine Hoset; Jean-François Le Galliard; Gry Gundersen
Demographic responses to a mild winter in enclosed vole populations Journal Article
In: Population Ecology, vol. 51, no. 2, pp. 279–288, 2009, ISSN: 1438-3896.
Abstract | Links | BibTeX | Tags: behaviour, climate change, food, Microtus oeconomus, small mammals, small mammals, small mammals, small mammals, space use, survival
@article{hoset_demographic_2009,
title = {Demographic responses to a mild winter in enclosed vole populations},
author = {Katrine Hoset and Jean-François Le Galliard and Gry Gundersen},
url = {http:ws.isiknowledge.comcpsøpenurlservice?url_ver=Z39.88-2004&rft_id=info:ut000264328900007},
doi = {DOI: 10.1007/s10144-008-0130-4},
issn = {1438-3896},
year = {2009},
date = {2009-01-01},
journal = {Population Ecology},
volume = {51},
number = {2},
pages = {279--288},
abstract = {Mild winter weather causing snow to melt and ice to accumulate on the ground has been proposed to cause the decreased survival of individuals, and less pronounced cyclicity, of small rodent populations in Fennoscandia. However, detailed data linking ice accumulation to decreased winter survival is lacking. We live-trapped and monitored with passive integrated transponders enclosed populations of root voles (Microtus oeconomus) exposed to different amounts of ice accumulation through a mild winter. We studied how social behaviour and survival responded to snow melt and ice accumulation. Voles avoided ground ice by moving their home ranges, thus increasing home range overlap in enclosed populations experiencing more extensive ice cover. Winter survival was not affected by the amount of ice accumulation, and was only slightly reduced during ice formation in early winter. The lowest survival rates were found at the onset of snow melt in early spring. These results suggest that ice accumulation does not cause lower survival during mild winters, probably because plastic social behaviour enables root voles to reduce the negative effects of varying winter weather on survival. The mechanisms for lower survival during mild winters may operate during spring and be related to spring floods or increased susceptibility to predators.},
keywords = {behaviour, climate change, food, Microtus oeconomus, small mammals, small mammals, small mammals, small mammals, space use, survival},
pubstate = {published},
tppubtype = {article}
}
Mild winter weather causing snow to melt and ice to accumulate on the ground has been proposed to cause the decreased survival of individuals, and less pronounced cyclicity, of small rodent populations in Fennoscandia. However, detailed data linking ice accumulation to decreased winter survival is lacking. We live-trapped and monitored with passive integrated transponders enclosed populations of root voles (Microtus oeconomus) exposed to different amounts of ice accumulation through a mild winter. We studied how social behaviour and survival responded to snow melt and ice accumulation. Voles avoided ground ice by moving their home ranges, thus increasing home range overlap in enclosed populations experiencing more extensive ice cover. Winter survival was not affected by the amount of ice accumulation, and was only slightly reduced during ice formation in early winter. The lowest survival rates were found at the onset of snow melt in early spring. These results suggest that ice accumulation does not cause lower survival during mild winters, probably because plastic social behaviour enables root voles to reduce the negative effects of varying winter weather on survival. The mechanisms for lower survival during mild winters may operate during spring and be related to spring floods or increased susceptibility to predators.