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}
}
2008
Patrick S Fitze; Jean-François Le Galliard
Operational sex ratio, sexual conflict and the intensity of sexual selection Journal Article
In: Ecology Letters, vol. 11, pp. 432–439, 2008.
Abstract | Links | BibTeX | Tags: sex ratio, sex ratio, sexual conflict, trade-off, Zootoca vivipara
@article{fitze_operational_2008,
title = {Operational sex ratio, sexual conflict and the intensity of sexual selection},
author = {Patrick S Fitze and Jean-François Le Galliard},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1461-0248.2008.01158.x},
doi = {https://doi.org/10.1111/j.1461-0248.2008.01158.x},
year = {2008},
date = {2008-01-01},
journal = {Ecology Letters},
volume = {11},
pages = {432--439},
abstract = {Modern sexual selection theory indicates that reproductive costs rather than the
operational sex ratio predict the intensity of sexual selection. We investigated sexual
selection in the polygynandrous common lizard Lacerta vivipara. This species shows male
aggression, causing high mating costs for females when adult sex ratios (ASR) are malebiased.
We manipulated ASR in 12 experimental populations and quantified the intensity
of sexual selection based on the relationship between reproductive success and body
size. In sharp contrast to classical sexual selection theory predictions, positive directional
sexual selection on male size was stronger and positive directional selection on female
size weaker in female-biased populations than in male-biased populations. Thus,
consistent with modern theory, directional sexual selection on male size was weaker in
populations with higher female mating costs. This suggests that the costs of breeding,
but not the operational sex ratio, correctly predicted the strength of sexual selection.},
keywords = {sex ratio, sex ratio, sexual conflict, trade-off, Zootoca vivipara},
pubstate = {published},
tppubtype = {article}
}
operational sex ratio predict the intensity of sexual selection. We investigated sexual
selection in the polygynandrous common lizard Lacerta vivipara. This species shows male
aggression, causing high mating costs for females when adult sex ratios (ASR) are malebiased.
We manipulated ASR in 12 experimental populations and quantified the intensity
of sexual selection based on the relationship between reproductive success and body
size. In sharp contrast to classical sexual selection theory predictions, positive directional
sexual selection on male size was stronger and positive directional selection on female
size weaker in female-biased populations than in male-biased populations. Thus,
consistent with modern theory, directional sexual selection on male size was weaker in
populations with higher female mating costs. This suggests that the costs of breeding,
but not the operational sex ratio, correctly predicted the strength of sexual selection.
2005
Jean-François Le Galliard; Patrick Fitze; Régis Ferrière; Jean Clobert
Sex ratio bias, male aggression, and population collapse in lizards Journal Article
In: Proceedings of the National Academy of Sciences USA, vol. 102, no. 50, pp. 18231–18236, 2005.
Links | BibTeX | Tags: extinction, sex ratio, sexual conflict, sexual selection, squamate reptiles, Zootoca vivipara
@article{le_galliard_sex_2005,
title = {Sex ratio bias, male aggression, and population collapse in lizards},
author = {Jean-François Le Galliard and Patrick Fitze and Régis Ferrière and Jean Clobert},
url = {https://www.pnas.org/content/102/50/18231},
doi = {https://doi.org/10.1073/pnas.0505172102},
year = {2005},
date = {2005-01-01},
journal = {Proceedings of the National Academy of Sciences USA},
volume = {102},
number = {50},
pages = {18231--18236},
keywords = {extinction, sex ratio, sexual conflict, sexual selection, squamate reptiles, Zootoca vivipara},
pubstate = {published},
tppubtype = {article}
}