Articles, books and book chapters

@article{kawamoto_role_2021,

title = {The role of social costs as a mechanism enforcing the honesty of ultraviolet-reflecting signals in a lizard},

author = {Anna Kawamoto and Jean-François Le Galliard and Arnaud Badiane},

url = {https://doi.org/10.1093/biolinnean/blab008},

doi = {10.1093/biolinnean/blab008},

issn = {0024-4066},

year  = {2021},

date = {2021-05-13},

urldate = {2021-05-13},

journal = {Biological Journal of the Linnean Society},

volume = {133},

issue = {4},

pages = {1126–1138},

abstract = {According to animal signalling theory, social costs incurred by aggressive conspecifics are one mechanism maintaining signal honesty. Although our understanding of signal evolution has much improved for pigment-based colours, the mechanisms maintaining the honesty of structural colour signals, such as ultraviolet (UV), remain elusive. Here, we used the common lizard (Zootoca vivipara) to test whether the honesty of UV-reflecting signals displayed on male throats is under social control. To do so, we staged agonistic interactions between non-manipulated focal males and opponents of either larger or smaller body size. We manipulated the UV component of the male throat colour patch to create small cheaters with UV-enhanced throats, large cheaters with UV-reduced throats, and their respective controls. In support of a conventional signal hypothesis, focal males were aggressive towards large cheaters and became submissive when these large cheaters retaliated, and were less submissive against small cheaters. However, that focal males were not more aggressive towards small cheaters contradicts our initial predictions. We confirm that male UV reflectance and bite force were good predictors of contest outcomes in control conditions. Overall, we provide partial evidence suggesting that social costs enforce UV signal honesty in common lizards.},

keywords = {competition, sexual selection, UV coloration},

pubstate = {published},

tppubtype = {article}

}

@article{le_galliard_experimental_2015,

title = {An experimental test of density-dependent selection on temperament traits of activity, boldness and sociability},

author = {Jean-François Le Galliard and Mathieu Paquet and Marianne Mugabo},

url = {https://onlinelibrary.wiley.com/doi/full/10.1111/jeb.12641},

doi = {https://doi.org/10.1111/jeb.12641},

issn = {1420-9101},

year  = {2015},

date = {2015-01-01},

journal = {Journal of Evolutionary Biology},

volume = {28},

number = {5},

pages = {1144--1155},

abstract = {Temperament traits are seen in many animal species, and recent evolutionary models predict that they could be maintained by heterogeneous selection. We tested this prediction by examining density-dependent selection in juvenile common lizards Zootoca vivipara scored for activity, boldness and sociability at birth and at the age of 1 year. We measured three key life-history traits (juvenile survival, body growth rate and reproduction) and quantified selection in experimental populations at five density levels ranging from low to high values. We observed consistent individual differences for all behaviours on the short term, but only for activity and one boldness measure across the first year of life. At low density, growth selection favoured more sociable lizards, whereas viability selection favoured less active individuals. A significant negative correlational selection on activity and boldness existed for body growth rate irrespective of density. Thus, behavioural traits were characterized by limited ontogenic consistency, and natural selection was heterogeneous between density treatments and fitness traits. This confirms that density-dependent selection plays an important role in the maintenance of individual differences in exploration-activity and sociability.},

keywords = {competition, correlational selection, natural selection, personality, trade-off},

pubstate = {published},

tppubtype = {article}

}

@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}

}

@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}

}

@article{le_galliard_natal_2006,

title = {Natal dispersal, interactions among siblings and intrasexual competition},

author = {Jean-François Le Galliard and Gry Gundersen and Harry P Andreassen and Nils C Stenseth},

url = {https://academic.oup.com/beheco/article/17/5/733/206909},

doi = {https://doi.org/10.1093/beheco/arl002},

year  = {2006},

date = {2006-01-01},

journal = {Behavioral Ecology},

volume = {17},

number = {5},

pages = {733--740},

keywords = {competition, dispersal, inbreeding avoidance, infanticide, kin cooperation, reproduction},

pubstate = {published},

tppubtype = {article}

}

@article{le_galliard_effect_2005,

title = {Effect of patch occupancy on immigration in the common lizard},

author = {Jean-François Le Galliard and Régis Ferrière and Jean Clobert},

url = {https://besjournals.onlinelibrary.wiley.com/doi/full/10.1111/j.1365-2656.2005.00912.x},

doi = {https://doi.org/10.1111/j.1365-2656.2005.00912.x},

year  = {2005},

date = {2005-01-01},

journal = {Journal of Animal Ecology},

volume = {74},

number = {2},

pages = {241--249},

keywords = {colonisation, competition, conspecific attraction, dispersal, Zootoca vivipara},

pubstate = {published},

tppubtype = {article}

}