معرفی
Jean-Michel Guillon is a CNRS Researcher (CR1) at the Laboratoire Écologie, Saclay et Évolution (IDEEV) affiliated with Université Paris-Saclay, where he has been active since 1998. His research integrates evolutionary theory, ecological fieldwork, and molecular biology to investigate environmental sex determination mechanisms across plant and reptile systems. As a qualified HDR supervisor, he directs research within the 'Ecological Processes and human Impact' team.
His academic background includes:
- PhD in Biology from École Polytechnique (1989-1992) focusing on bacterial translation mechanisms
- DEA in Fundamental Bases of Oncogenesis (Université Paris 11, 1987-1988)
- Agrégation in Biochemistry-Biological Engineering (1986-1987)
- Studies at École Normale Supérieure de Cachan (Section Biochemistry, 1984-1988)
Guillon's research centers on environmental sex determination (ESD), particularly in horsetails (Equisetum) and turtles. He pioneered experimental demonstrations of how light intensity and sugar availability manipulate sex ratios in Equisetum gametophytes, challenging classical Charnov-Bull models by revealing dispersal dynamics as critical evolutionary drivers. His theoretical frameworks incorporate spatially explicit modeling of sex-biased dispersal and habitat heterogeneity. In reptile studies, he established causal links between nest-site selection, temperature gradients, and skewed sex ratios in turtles, providing foundational models for climate change impact assessments. His phylogenetic work on Equisetum using chloroplast DNA redefined taxonomic classifications by questioning subgeneric monophyly.
Analysis of his 15 most recent publications reveals consistent interdisciplinary integration across evolutionary biology, ecology, and statistics. Key trends include: (1) Progressive refinement of sex ratio models incorporating spatial/temporal environmental variation; (2) Methodological innovation in thermal biology (e.g., embryo growth modeling for sex determination); (3) Cross-taxon synthesis of ESD mechanisms from plants to reptiles; (4) Increasing focus on anthropogenic impacts, particularly climate-driven sex ratio distortions in vulnerable turtle populations. His work bridges theoretical predictions with conservation applications, exemplified by global change vulnerability assessments for TSD species.
Guillon has supervised doctoral research including Vincent Hulin's thesis on turtle nest-site selection and TSD evolution. His collaborative network spans CNRS laboratories, Université Paris-Saclay, and international herpetology research groups, supported by institutional funding from CNRS and university frameworks. Current projects continue to explore dispersal-sex ratio interactions in heterogeneous landscapes.
He operates within the 'Ecological Processes and human Impact' research team at IDEEV laboratory (Bâtiment 680, Gif-sur-Yvette), utilizing controlled environment facilities for Equisetum gametophyte cultures and computational resources for theoretical modeling. Fieldwork components involve turtle nesting site monitoring across European habitats, integrated with climate data modeling.
