Thesis defense of Chloé Chabaud

“Influence of water balance on trophic interactions and predation risk in a terrestrial ectothermic mesopredator”

Ongoing climate change is affecting environmental temperatures but also water availability in ecosystems, which may disrupt trophic relationships between prey and predators. In terrestrial ectotherms, there is a conflict between the regulation of body temperature and water balance, but we lack data to characterize the effects of the associated trade-offs on biotic interactions. This thesis addresses this issue through the ecophysiological and behavioural study of traits related to thermo-hydroregulation and trophic relationships in the Common lizard (Zootoca vivipara). This generalist mesopredator feeds on a wide variety of prey and is subject to heavy predation, especially by specialized snakes. Reptiles exhibit a large range of functional traits associated with thermo-hydroregulation, and my work characterizes the individual and geographic determinants of these traits in the Common lizard. Then, using experimental approaches, I demonstrate that water restriction cannot be compensated by food intakes in this species, and food actually exacerbates behavioural conflicts between thermo- and hydroregulation. Through laboratory observations, I also investigate the trade-offs between behavioural hydroregulation and predator avoidance. I show that detecting predators via chemoreception increases water loss and this ability is therefore sensitive to water restriction. This work suggests that the behavioural strategies employed by organisms for thermo-hydroregulation can influence the dynamics of predator-prey relationships.

Key-word: water balance, diet, anti-predator behaviours, physiology, ectotherm, thermo-hydroregulation

The event is finished.


Apr 21 2023

More Info

Read More
Read More


Please follow & share us :)

Adaptation Adaptation, evolution and phenotype Africa ageing Agriculture Agroecology Animal ecophysiology Animals Anthropization Ants Arabidopsis thaliana Asia Bactéria Behaviours Biocontrol Biodiversity Biome Butterflies Carbon Cultures Cyanbacteria Dispersion Drosophila Drought and desertifications Earthworm Ecological engineering Ecophysiology Ecosystem functions and services Electrophysiology Environmental disturbances Erosion Fertility and reproduction Fire Freshwater aquatic environment Genomics Herbivores hormons Immune system Insects Interaction networks Lizards and reptiles Metabolomic micro-organisms Mineralogy Modeling and self-centered simulation Neurobiology Nitrogen Nutrients Olfaction and taste Parasitism Participatory science Pathogens Pesticides and endocrine disruptors Pests and invasive species Pheromones Physical and chemical properties Pigeons Plant ecophysiology Plants Pollinators Pollutants Porosity Proline proteomic Root system Savannah Size Sociality Sociology Soil Organic Matter - SOM Soils Springtails Stress Survival Sustainable development Temperature and climate change Termites Tits Transcriptomic Tropical environments and forests Urban environments Volatile organic compounds - VOCs Wasps Water cycle Watershed


Seminars and events

No event found!