Paul Béziers

Paul Béziers
McGill University | McGill · Faculty of Agricultural and Environmental Sciences

PhD
Swiss NSF Postdoctoral Fellow (SNSF)

About

24
Publications
6,138
Reads
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266
Citations
Citations since 2017
10 Research Items
229 Citations
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201720182019202020212022202301020304050
201720182019202020212022202301020304050
Additional affiliations
August 2018 - July 2019
University of Lausanne
Position
  • PostDoc Position
February 2012 - present
University of Lausanne
Position
  • PhD Student

Publications

Publications (24)
Article
The age at first reproduction can significantly impact fitness. We investigated the possible source of variation in the age at first reproduction (‘sexual maturity') and its consequences for lifetime reproductive success in a wild population of barn owls. This raptor is sexually dimorphic for two melanin‐based plumage traits shown to covary with se...
Article
Full-text available
Bird nests are specialized habitats because of their particular composition including nest detritus and bird droppings. In consequence, they attract a specialized arthropod community considered as nidicolous, which includes species only found in bird nests (strictly nidicolous) or sometimes found in bird nests (facultatively nidicolous). Because th...
Article
Glucocorticoid hormones, such as corticosterone, are crucial in regulating daily life metabolism and energy expenditure, as well as promoting short-term physiological and behavioural responses to unpredictable environmental challenges. Therefore, glucocorticoids are considered to mediate trade-offs between survival and reproduction. Relatively litt...
Article
Full-text available
The Moon cycle exposes nocturnal life to variation in environmental light. However, whether moonlight shapes the fitness of nocturnal species with distinct colour variants remains unknown. Combining data from long-term monitoring, high-resolution global positioning system tracking and experiments using prey, we show that barn owls (Tyto alba) with...
Article
Glucocorticoid hormones are important intermediates between an organism and its environment. They enable an organism to adjust its behavioural and physiological processes in response to environmental changes by binding to mineralocorticoid receptors (MR) and glucocorticoid receptors (GR) expressed in many tissues, including the integument. The regu...
Article
Full-text available
The hypothalamic–pituitary–adrenal (HPA) axis is responsible for the regulation of corticosterone, a hormone that is essential in the mediation of energy allocation and physiological stress. As a continuous source of challenge and stress for organisms, the environment has promoted the evolution of physiological adaptations and led to a great variat...
Preprint
Full-text available
In biparental species, reproductive success depends not only on the quality of the parents, the care they each provide and many environmental factors such as territory quality and food availability, but also on the ability of the parents to collaborate and divide reproductive tasks. Because hormones, such as corticosterone (CORT), modulate physiolo...
Preprint
Full-text available
Glucocorticoid hormones, such as corticosterone, are important intermediates between an organism and its environment. They enable an organism to adjust his behavioural and physiological processes in response to environmental changes by binding to mineralocorticoid receptors (MR) and glucocorticoid receptors (GR) expressed in many tissues, including...
Article
Temporal variation in physical activity is mainly determined by the day–night cycle. While this may be true for diurnal species whose vision at night is often poor, the situation might be more complex in nocturnal animals as many such species can see both in the dark and in the daylight. We examined in Barn Owl (Tyto alba) nestlings whether tempora...
Article
Knowledge of how and why secondary sexual characters are associated with sex hormones is important to understand their signalling function. Such a link can occur if testosterone participates in the elaboration of sex-traits, if the display of an ornament triggers behavioural response in conspecifics that induce a rise in testosterone or if genes im...
Article
Full-text available
Endothermic animals vary in their physiological ability to maintain a constant body temperature. Since melanin-based coloration is related to thermoregulation and energy homeostasis, we predict that dark and pale melanic individuals adopt different behaviours to regulate their body temperature. Young animals are particularly sensitive to a decrease...
Article
Full-text available
Many bird species produce two annual broods during a single breeding season. However, not all individuals reproduce twice in the same year suggesting that double brooding is condition-dependent. In contrast to most raptors and owls, the barn owl (Tyto alba) produces two annual clutches in most worldwide distributed populations. Nevertheless, the de...
Article
Human activities can have a suite of positive and negative effects on animals and thus can affect various life history parameters. Human presence and agricultural practice can be perceived as stressors to which animals react with the secretion of glucocorticoids. The acute short-term secretion of glucocorticoids is considered beneficial and helps a...
Article
Variants of the melanocortin-1 receptor (MC1R) gene results in abrupt, naturally selected color morphs. These genetic variants may differentially affect sexual dimorphism if one morph is naturally selected in the two sexes but another morph is naturally or sexually selected only in one of the two sexes (e.g., to confer camouflage in reproductive fe...
Article
Full-text available
A simple way to quickly optimize microsatellites in non-model organisms is to re-use loci available in closely related taxa; however, this approach can be limited by the stochastic and low cross-amplification success experienced in some groups (e.g. amphibians). An efficient alternative is to develop loci from transcriptome sequences. Transcriptomi...

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Projects

Project (1)
Project
With this project, we aim at discovering how genetic variation maps to (co)variation in different plumage colour traits (phaeomelan-based plumage redness and eumelan-based black spot size and number) in barn owls. This is a necessary first step to better understand why these melanin-based colour traits evolve and particularly, become associated with physiological, behavioural, and morphological traits in this cosmopolitan species.