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
Patrick S Fitze; Jean-François Le Galliard
Inconsistency between different measures of sexual selection Journal Article
In: The American Naturalist, vol. 178, no. 2, pp. 256–268, 2011, ISSN: 0003-0147.
Abstract | Links | BibTeX | Tags: competition, microsatellite markers, natural selection, sex ratio, sexual selection, Zootoca vivipara, Zootoca vivipara
@article{fitze_inconsistency_2011,
title = {Inconsistency between different measures of sexual selection},
author = {Patrick S Fitze and Jean-François Le Galliard},
url = {https://www.journals.uchicago.edu/doi/abs/10.1086/660826},
doi = {https://doi.org/10.1086/660826},
issn = {0003-0147},
year = {2011},
date = {2011-01-01},
journal = {The American Naturalist},
volume = {178},
number = {2},
pages = {256--268},
abstract = {Measuring the intensity of sexual selection is of fundamental importance to the study of sexual dimorphism, population dynamics, and speciation. Several indices, pools of individuals, and fitness proxies are used in the literature, yet their relative performances are strongly debated. Using 12 independent common lizard populations, we manipulated the adult sex ratio, a potentially important determinant of the intensity of sexual selection at a particular time and place. We investigated differences in the intensity of sexual selection, as estimated using three standard indices of sexual selection-the standardized selection gradient (beta'), the opportunity of selection (I), and the Bateman gradient (beta(ss))-calculated for different pools of individuals and different fitness proxies. We show that results based on estimates of I were the opposite of those derived from the other indices, whereas results based on estimates of beta' were consistent with predictions derived from knowledge about the species' mating system. In addition, our estimates of the strength and direction of sexual selection depended on both the fitness proxy used and the pool of individuals included in the analysis. These observations demonstrate inconsistencies in distinct measures of sexual selection and underscore the need for caution when comparing studies and species.},
keywords = {competition, microsatellite markers, natural selection, sex ratio, sexual selection, Zootoca vivipara, Zootoca vivipara},
pubstate = {published},
tppubtype = {article}
}
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}
}