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Publications (42)
Infectious diseases are influenced by interactions between host and pathogen, and the number of infected hosts is rarely homogenous across the landscape. Areas with elevated pathogen prevalence can maintain a high force of infection and may indicate areas with disease impacts on host populations. However, isolating the ecological processes that res...
Documenting intra-specific diet variations among remote populations, thus across different habitats, is important to address evolutionary (e.g., phenotypic plasticity) and conservation issues (e.g., capacity to adapt to changing prey availability). We compared the diet of different populations of Asp vipers (Vipera aspis aspis; Linnaeus, 1758) livi...
In many taxa, natural selection favours the ability of a female to accommodate a clutch or litter that is very large relative to her own body, placing a selective premium on traits that increase available abdominal space relative to litter volume. Flexible changes during pregnancy might help to mitigate these constraints. Using ultrasound scanning...
1. Infectious diseases are influenced by interactions between host and pathogen, and are rarely homogenous across the landscape. Areas with elevated pathogen prevalence maintain a high force of infection, can facilitate pathogen spread to new regions, and may indicate areas with impacts on host populations. However, isolating the ecological process...
Les reptiles sont particulièrement vulnérables aux modifications des paysages et des habitats du fait de leur mobilité réduite et de leurs exigences thermiques et hydriques. De nombreuses espèces sont en déclin dans le monde et également en France. Des études récentes mettent en évidence l’importance des milieux bordiers pour leur conservation et
l...
Comparative studies of mortality in the wild are necessary to understand the evolution of aging; yet, ectothermic tetrapods are underrepresented in this comparative landscape, despite their suitability for testing evolutionary hypotheses. We present a study of aging rates and longevity across wild tetrapod ectotherms, using data from 107 population...
Les recommandations de gestion d’habitat en faveur des Squamates terrestres s’intéressent principalement aux éléments bordiers et délaissent souvent les habitats ouverts comme les prairies. L’observation visuelle et la surveillance régulière d’un réseau de plaques refuges positionnées sur les lisières et le centre d’une prairie permanente non pâtur...
Agricultural landscapes cover a large portion of the planet and the intensification of farming is a primary cause of biodiversity loss. Changes in agricultural practices have been particularly marked in Western Europe over the last century. Hedgerow landscapes consist of complex mosaics of pastures, ponds, and hedges connected with forest patches t...
Asp vipers ( Vipera aspis ) and adders ( Vipera berus ) coexist in the Loire-Atlantique department in France where the two species reach their respective range limits. This contact zone is of special interest since hybridization has been recently discovered there. We carried out extensive sampling to further investigate the hybrid status of morphol...
Droughts are becoming more intense and frequent with climate change. These extreme weather events can lead to mass mortality and reproduction failure, and therefore cause population declines. Understanding how the reproductive physiology of organisms is affected by water shortages will help clarify whether females can adjust their reproductive stra...
Les résultats préliminaires de 4 années d'études des squamates de la lande de l'hippodrome de la commune du Gâvre (Loire-Atlantique) mettent en évidence la richesse spécifique du site puisqu'on y trouve 8 espèces de squamates auxquelles s'ajoute l'hybride entre les deux espèces de vipère. La lande périphérique, située en lisière forestière, abrite...
We examined the contact zone of two parapatric species of grass snake (Natrix astreptophora and Natrix helvetica) in southern France. To this end, we used comprehensive sampling, analysed mtDNA sequences and microsatellite loci, and built Species Distribution Models for current and past climatic conditions. The contact zone had established by the m...
Table S1. Grass snake samples used in the present study. Haplotypes with asterisks could not be identified more precisely because obtained DNA sequences were too short. These short sequences were not used for drawing haplotype networks. Red haplotypes were newly identified in the present study. Samples used for HYBRIDLAB calculations bear symbols i...
L'étude a été menée sur la commune bocagère de Bouvron, située dans le département de la Loire-Atlantique. Le paysage bocager y a été profondément simplifié par le remembrement de 1963, lequel a brutalement fait disparaître un grand nombre de mares, de fossés, de taillis et de haies. Depuis, la dégradation du bocage s'est poursuivie de manière croi...
During a study performed in natural conditions on five snake species of the bocage of the Loire-Atlantique department, we collected 2,143 individual data of digesting animals at different stages from prey intake to faeces. This information was gathered during the activity period of the species from beginning of March to November, from 1998 to 2018....
Depuis quarante ans, de nombreux inventaires et suivis ont été réalisés sur la Vipère péliade Vipera berus (Linné, 1758) dans l'ouest de la France. On constate un faible polymorphisme des individus ainsi qu'une grande rareté des spécimens mélaniques. Nous rapportons ici trois observations inédites d'individus fortement mélanisants à mélaniques et c...
The circumscribed presence of grass snakes Natrix natrix helvetica (Linnaeus, 1758) specimens displaying a melanic phenotype has been known since about 50 years in northwestern France. Between 1993 and 2017, the gathering of information enabled to confi rm the presence of 133 individuals partially or totally black individuals within 26 communes dis...
Entre 1994 et 2016 nous avons prospecté la quasi-totalité du département de la Loire-Atlantique à la recherche de de la Vipère péliade (Vipera berus) et la Vipère aspic (Vipera aspis). Les deux espèces ont été respectivement observées à 4 268 et 1 602 reprises dans 52 mailles UTM 10 × 10 km et 82 communes du département. L'ensemble de ces données p...
Water constraints can mediate evolutionary conflict either among individuals (e.g., parent-offspring conflict, sexual conflict) or within an individual (e.g., cost of reproduction). During pregnancy, water is of particular importance because the female provides all water needed for embryonic development and experiences important maternal shifts in...
A female of aspic Viper is discovered crushed on a road in the town of Saint-Herblain in the Loire-Atlantique department on 26/05/2012. This female had the distinction of being in late gestation in the vernal mating time. After an autopsy, the litter has three embryos and a well-developed small viper. The most likely hypothesis would be related to...
Western European vipers are well-defined species with parapatric distributions that reflect contrasting thermal niches and climatic adaptations. Contact zones are usually narrow, coincide with steep ecological gradients and are associated with clear habitat segregation. Natural hybridization has been demonstrated between several species but has not...
Le nombre de paires d'écailles sous-caudales a été relevé chez 350 serpents matures (35 individus par sexe et par espèce) chez cinq taxons sympatriques du quart Nord-Ouest du département de la Loire-Atlantique. La morphologie de la queue des mâles diffère de celle des femelles car elle est plus épaisse à sa base et plus allongée pour y loger les or...
Les bocages font partie des paysages agricoles créés par l’homme très favorables à la flore et la faune du fait qu’ils offrent à la fois des milieux fermés (boisements), des milieux ouverts (prairies) et des milieux de transition que sont les haies et les lisières. De nombreuses espèces de reptiles utilisent ces milieux bordiers aussi bien comme ab...
Terrestrial ectotherms predominantly use behavioural means to thermoregulate and thereby optimize performances. However, thermoregulation can impart physiological challenges to other critical processes such as water balance by increasing evaporative water loss (EWL). Like thermoregulation, water balance is influenced by both external factors (e.g.,...
Bull. Soc. Sc. Nat. Ouest de la France, nouvelle série, tome 34 (3) 2012 153 Un cas tératologique de Coronella austriaca (Laurenti, 1768) dans le département de la Loire-Atlantique (France) Gaëtan GUILLER * RÉSUMÉ : Un spécimen tératologique de Coronelle lisse Coronella austriaca (Laurenti, 1768) comportant des aberrations particulières et peu comm...
We studied a population of common adder Vipera berus (Linnaeus, 1758) in the neighbourhood of Bouvron, Loire Atlantique District., France, where the species reaches the south-western limit of its geographic range. This study was conducted from 1998 to 2003 using capture recapture methods. Each snake was individually marked by scale clipping. Numero...
