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
2014
2.
Alice Rémy; Jean-François Le Galliard; Morten Odden; Harry P Andreassen
Concurrent effects of age class and food distribution on immigration success and population dynamics in a small mammal Journal Article
In: Journal of Animal Ecology, vol. 83, no. 4, pp. 813–822, 2014, ISSN: 1365-2656.
Abstract | Links | BibTeX | Tags: behaviour, demography, dispersal, food, sexual selection
@article{remy_concurrent_2014,
title = {Concurrent effects of age class and food distribution on immigration success and population dynamics in a small mammal},
author = {Alice Rémy and Jean-François Le Galliard and Morten Odden and Harry P Andreassen},
url = {https://besjournals.onlinelibrary.wiley.com/doi/full/10.1111/1365-2656.12184},
doi = {https://doi.org/10.1111/1365-2656.12184},
issn = {1365-2656},
year = {2014},
date = {2014-01-01},
journal = {Journal of Animal Ecology},
volume = {83},
number = {4},
pages = {813--822},
abstract = {* During the settlement stage of dispersal, the outcome of conflicts between residents and immigrants should depend on the social organization of resident populations as well as on individual traits of immigrants, such as their age class, body mass andtextbackslashor behaviour. * We have previously shown that spatial distribution of food influences the social organization of female bank voles (Myodes glareolus). Here, we aimed to determine the relative impact of food distribution and immigrant age class on the success and demographic consequences of female bank vole immigration. We manipulated the spatial distribution of food within populations having either clumped or dispersed food. After a pre-experimental period, we released either adult immigrants or juvenile immigrants, for which we scored sociability and aggressiveness prior to introduction. * We found that immigrant females survived less well and moved more between populations than resident females, which suggest settlement costs. However, settled juvenile immigrants had a higher probability to reproduce than field-born juveniles. * Food distribution had little effects on the settlement success of immigrant females. Survival and settlement probabilities of immigrants were influenced by adult female density in opposite ways for adult and juvenile immigrants, suggesting a strong adult–adult competition. Moreover, females of higher body mass at release had a lower probability to survive, and the breeding probability of settled immigrants increased with their aggressiveness and decreased with their sociability. * Prior to the introduction of immigrants, resident females were more aggregated in the clumped food treatment than in the dispersed food treatment, but immigration reversed this relationship. In addition, differences in growth trajectories were seen during the breeding season, with populations reaching higher densities when adult immigrants were introduced in a plot with dispersed food, or when juvenile immigrants were introduced in a plot with clumped food. * These results indicate the relative importance of intrinsic and extrinsic factors on immigration success and demographic consequences of dispersal and are of relevance to conservation actions, such as reinforcement of small populations.},
keywords = {behaviour, demography, dispersal, food, sexual selection},
pubstate = {published},
tppubtype = {article}
}
* During the settlement stage of dispersal, the outcome of conflicts between residents and immigrants should depend on the social organization of resident populations as well as on individual traits of immigrants, such as their age class, body mass andtextbackslashor behaviour. * We have previously shown that spatial distribution of food influences the social organization of female bank voles (Myodes glareolus). Here, we aimed to determine the relative impact of food distribution and immigrant age class on the success and demographic consequences of female bank vole immigration. We manipulated the spatial distribution of food within populations having either clumped or dispersed food. After a pre-experimental period, we released either adult immigrants or juvenile immigrants, for which we scored sociability and aggressiveness prior to introduction. * We found that immigrant females survived less well and moved more between populations than resident females, which suggest settlement costs. However, settled juvenile immigrants had a higher probability to reproduce than field-born juveniles. * Food distribution had little effects on the settlement success of immigrant females. Survival and settlement probabilities of immigrants were influenced by adult female density in opposite ways for adult and juvenile immigrants, suggesting a strong adult–adult competition. Moreover, females of higher body mass at release had a lower probability to survive, and the breeding probability of settled immigrants increased with their aggressiveness and decreased with their sociability. * Prior to the introduction of immigrants, resident females were more aggregated in the clumped food treatment than in the dispersed food treatment, but immigration reversed this relationship. In addition, differences in growth trajectories were seen during the breeding season, with populations reaching higher densities when adult immigrants were introduced in a plot with dispersed food, or when juvenile immigrants were introduced in a plot with clumped food. * These results indicate the relative importance of intrinsic and extrinsic factors on immigration success and demographic consequences of dispersal and are of relevance to conservation actions, such as reinforcement of small populations.
2011
1.
Manuela González-Suárez; Jean-François Le Galliard; David Claessen
Population and life-history consequences of within-cohort individual variation Journal Article
In: The American Naturalist, vol. 178, no. 4, pp. 525–537, 2011, ISSN: 0003-0147.
Abstract | Links | BibTeX | Tags: body size, demography, demography, density, metabolism, performance, phenotypic plasticity, phenotypic plasticity, size-structured populations, stochasticity, structured population models, Zootoca vivipara, Zootoca vivipara, Zootoca vivipara
@article{gonzalez-suarez_population_2011,
title = {Population and life-history consequences of within-cohort individual variation},
author = {Manuela González-Suárez and Jean-François Le Galliard and David Claessen},
url = {https://www.journals.uchicago.edu/doi/abs/10.1086/661906},
doi = {https://doi.org/10.1086/661906},
issn = {0003-0147},
year = {2011},
date = {2011-01-01},
journal = {The American Naturalist},
volume = {178},
number = {4},
pages = {525--537},
abstract = {The consequences of within-cohort (i.e., among-individual) variation for population dynamics are poorly understood, in particular for the case where life history is density dependent. We develop a physiologically structured population model that incorporates individual variation among and within cohorts and allows us to explore the intertwined relationship between individual life history and population dynamics. Our model is parameterized for the lizard Zootoca vivipara and reproduces well the species' dynamics and life history. We explore two common mechanisms that generate within-cohort variation: variability in food intake and variability in birth date. Predicted population dynamics are inherently very stable and do not qualitatively change when either of these sources of individual variation is introduced. However, increased within-cohort variation in food intake leads to changes in morphology, with longer but skinnier individuals, even though mean food intake does not change. Morphological changes result from a seemingly universal nonlinear relationship between growth and resource availability but may become apparent only in environments with strongly fluctuating resources. Overall, our results highlight the importance of using a mechanistic framework to gain insights into how different sources of intraspecific variability translate into life-history and population-dynamic changes.},
keywords = {body size, demography, demography, density, metabolism, performance, phenotypic plasticity, phenotypic plasticity, size-structured populations, stochasticity, structured population models, Zootoca vivipara, Zootoca vivipara, Zootoca vivipara},
pubstate = {published},
tppubtype = {article}
}
The consequences of within-cohort (i.e., among-individual) variation for population dynamics are poorly understood, in particular for the case where life history is density dependent. We develop a physiologically structured population model that incorporates individual variation among and within cohorts and allows us to explore the intertwined relationship between individual life history and population dynamics. Our model is parameterized for the lizard Zootoca vivipara and reproduces well the species' dynamics and life history. We explore two common mechanisms that generate within-cohort variation: variability in food intake and variability in birth date. Predicted population dynamics are inherently very stable and do not qualitatively change when either of these sources of individual variation is introduced. However, increased within-cohort variation in food intake leads to changes in morphology, with longer but skinnier individuals, even though mean food intake does not change. Morphological changes result from a seemingly universal nonlinear relationship between growth and resource availability but may become apparent only in environments with strongly fluctuating resources. Overall, our results highlight the importance of using a mechanistic framework to gain insights into how different sources of intraspecific variability translate into life-history and population-dynamic changes.