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
2011
2.
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.
1.
Marianne Mugabo; Olivier Marquis; Samuel Perret; Jean-François Le Galliard
Direct and socially-mediated effects of food availability late in life on life-history variation in a short-lived lizard Journal Article
In: Oecologia, vol. 166, no. 4, pp. 949–960, 2011, ISSN: 0029-8549.
Abstract | Links | BibTeX | Tags: asymmetric competition, competition, density, density, food, life history, life history, reproduction, reproduction, Zootoca vivipara, Zootoca vivipara
@article{mugabo_direct_2011,
title = {Direct and socially-mediated effects of food availability late in life on life-history variation in a short-lived lizard},
author = {Marianne Mugabo and Olivier Marquis and Samuel Perret and Jean-François Le Galliard},
url = {https://link.springer.com/article/10.1007/s00442-011-1933-0},
doi = {https://doi.org/10.1007/s00442-011-1933-0},
issn = {0029-8549},
year = {2011},
date = {2011-01-01},
journal = {Oecologia},
volume = {166},
number = {4},
pages = {949--960},
abstract = {Food availability is a major environmental factor that can influence life history within and across generations through direct effects on individual quality and indirect effects on the intensity of intra- and intercohort competition. Here, we investigated in yearling and adult common lizards (Zootoca vivipara) the immediate and delayed life-history effects of a prolonged food deprivation in the laboratory. We generated groups of fully fed or food-deprived yearlings and adults at the end of one breeding season. These lizards were released in 16 outdoor enclosures together with yearlings and adults from the same food treatment and with food-deprived or fully fed juveniles, creating four types of experimental populations. Experimental populations were then monitored during 2 years, which revealed complex effects of food on life-history trajectories. Food availability had immediate direct effects on morphology and delayed direct effects on immunocompetence and female body condition at winter emergence. Also, male annual survival rate and female growth rate and body size were affected by an interaction between direct effects of food availability and indirect effects on asymmetric competition with juveniles. Reproductive outputs were insensitive to past food availability, suggesting that female common lizards do not solely rely on stored energy to fuel reproduction. Finally, food conditions had socially-mediated intergenerational effects on early growth and survival of offspring through their effects on the intensity of competition. This study highlights the importance of social interactions among cohorts for life-history trajectories and population dynamics in stage-structured populations.},
keywords = {asymmetric competition, competition, density, density, food, life history, life history, reproduction, reproduction, Zootoca vivipara, Zootoca vivipara},
pubstate = {published},
tppubtype = {article}
}
Food availability is a major environmental factor that can influence life history within and across generations through direct effects on individual quality and indirect effects on the intensity of intra- and intercohort competition. Here, we investigated in yearling and adult common lizards (Zootoca vivipara) the immediate and delayed life-history effects of a prolonged food deprivation in the laboratory. We generated groups of fully fed or food-deprived yearlings and adults at the end of one breeding season. These lizards were released in 16 outdoor enclosures together with yearlings and adults from the same food treatment and with food-deprived or fully fed juveniles, creating four types of experimental populations. Experimental populations were then monitored during 2 years, which revealed complex effects of food on life-history trajectories. Food availability had immediate direct effects on morphology and delayed direct effects on immunocompetence and female body condition at winter emergence. Also, male annual survival rate and female growth rate and body size were affected by an interaction between direct effects of food availability and indirect effects on asymmetric competition with juveniles. Reproductive outputs were insensitive to past food availability, suggesting that female common lizards do not solely rely on stored energy to fuel reproduction. Finally, food conditions had socially-mediated intergenerational effects on early growth and survival of offspring through their effects on the intensity of competition. This study highlights the importance of social interactions among cohorts for life-history trajectories and population dynamics in stage-structured populations.