Publications by authors named "J Thirion"
Population matrix models are routinely used to study the demography of wild populations and to guide management choices. When vital rates are unknown for a specific population or life history stage, researchers often replace them with estimates from other populations of the same species. Such 'hybrid' matrices might ignore among-population life history variation and lead to incorrect inferences.
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- Habitat anthropization negatively impacts global biodiversity, but some species show adaptive life-history responses, like increased reproduction, to cope with these changes.
- The study focused on the yellow-bellied toad and utilized a large dataset of over 21,000 individuals from various European populations to examine the effects of anthropogenic environments on their survival and reproduction.
- Results indicated that while adult toads had lower survival and shorter lifespans in human-modified habitats, their increased reproductive output compensated for these losses, helping to maintain stable population growth rates despite habitat alterations.
Article Synopsis
- This study explores the aging rates and longevity of ectothermic tetrapods, specifically nonavian reptiles and amphibians, using data from 107 wild populations across 77 species.
- It investigates how factors like thermoregulatory methods, environmental temperature, and life history strategies influence demographic aging among these animals.
- The findings reveal that ectotherms exhibit more diverse aging rates than endotherms and show instances of negligible aging, highlighting the importance of studying these species to better understand the evolution of aging.
Sex-related differences in mortality are widespread in the animal kingdom. Although studies have shown that sex determination systems might drive lifespan evolution, sex chromosome influence on aging rates have not been investigated so far, likely due to an apparent lack of demographic data from clades including both XY (with heterogametic males) and ZW (heterogametic females) systems. Taking advantage of a unique collection of capture-recapture datasets in amphibians, a vertebrate group where XY and ZW systems have repeatedly evolved over the past 200 million years, we examined whether sex heterogamy can predict sex differences in aging rates and lifespans.
View Article and Find Full Text PDFThe pervasive and unabated nature of global amphibian declines suggests common demographic responses to a given driver, and quantification of major drivers and responses could inform broad-scale conservation actions. We explored the influence of climate on demographic parameters (i.e.
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