Name: Réunion annuelle du RT Théorie et modélisation de la biodiversité
Start: 2025-12-01T09:00:00+01:00
End: 2025-12-03T17:00:00+01:00
Location: Bordeaux

Réunion annuelle du RT Théorie et modélisation de la biodiversité

de lundi 1 décembre 2025 (09:00) à mercredi 3 décembre 2025 (17:00)

lundi 1 décembre 2025

13:00 Accueil des participants // Registration & coffee
Accueil des participants // Registration & coffee
13:00 - 13:59
Room: Salle de conférences
14:00 Mot de bienvenue // Welcome words - Mehdi CHERIF (INRAE) Guilhem Sommeria-Klein (Centre Inria de l'Université de Bordeaux) Frédéric Barraquand (CNRS)
Mot de bienvenue // Welcome words
- Mehdi CHERIF (INRAE)
- Guilhem Sommeria-Klein (Centre Inria de l'Université de Bordeaux)
- Frédéric Barraquand (CNRS)
14:00 - 14:25
Room: Salle de conférences
14:30 Microbial and community ecology
Microbial and community ecology
14:30 - 16:00
Room: Salle de conférences
Contributions

14:30 A quick look at recent microbial macroecology - Matthieu Barbier (CIRAD & INTP)

15:00 Challenges in microbial interaction inference from time series - Felix Roy (INRAE)

15:30 Emergent coexistence in ecological communities - Guim Aguadé-Gorgorió (ISEM Montpellier)
16:00 Coffee break
Coffee break
16:00 - 16:30
Room: Salle de conférences

16:30 Keynote: Elsa Abs (CNRS, LCSE Paris)
Keynote: Elsa Abs (CNRS, LCSE Paris)
16:30 - 17:20
Room: Salle de conférences **Title**: Toward an eco-evolutionary modeling framework for the role of microbes in the carbon cycle **Abstract**: Soil microbes regulate a major part of the terrestrial carbon cycle, yet their dynamics are rarely represented in a mechanistic — let alone evolutionary — way in global models. In this talk, I will present a framework that combines microbial ecology, adaptive dynamics, and a mechanistic model of the carbon cycle. By linking microbial growth, enzyme allocation, and biogeochemical feedbacks, this model allows us to explore how microbial strategies could evolve under warming, and what consequences this might have for global carbon stocks. I will argue that this approach helps bridge classical evolutionary theory and microbial ecology, as well as phenomenological and process-based modeling perspectives — and discuss what it means to embed evolution explicitly in climate-relevant models.

19:30 Dinner
Dinner
19:30 - 21:30
mardi 2 décembre 2025

09:00 Keynote: Amaury Lambert (ENS, College de France)
Keynote: Amaury Lambert (ENS, College de France)
09:00 - 09:50
Room: Salle de conférences **Title**: Geometry and stability of species complexes **Abstract**: Species complexes are groups of closely related populations exchanging genes through migration. We study by a modeling approach the stability and the structure of species complexes in a class of metapopulation models where $N$ demes see their gene pools homogenize as an effect of gene flow and diverge through the local accumulation of neutral or selective substitutions. Importantly, we model the ecological feedback of differentiation on gene flow by assuming that the success of introgressions of foreign alleles increases with genomic similarity, through a specific nondecreasing function $h$. As the target of genomic differentiation gets large, pairwise genomic similarities approximately follow an autonomous system of $N(N-1)/2$ differential equations. We investigate the emergence of non-transitive species structures such as ring species and study the effect of temporary isolation on the species complex. We also show that in large, well-connected metapopulations, species form increasingly coherent and uniform entities, so that the initiation of speciation events requires the existence of idiosyncratic geographic or selective restrictions on gene flow.

09:50 Coffee break
Coffee break
09:50 - 10:30
Room: Salle de conférences
10:30 Biodiversity and ecosystem function
Biodiversity and ecosystem function
10:30 - 12:00
Room: Salle de conférences
Contributions

10:30 Beyond biomass: how interactions shape species’ role for ecosystem functioning - Alice Ardichvili (SETE)

11:00 Aridity and grazing modulate the multidimensional biodiversity–stability relationships in drylands - Benoît Pichon (Isem)

11:30 Partitioning net biodiversity effects on ecosystem resistance and resilience - Mario DESALLAIS (Université de Fribourg (Suisse))
12:00 Lunch
Lunch
12:00 - 14:00
14:00 Spatial modelling of ecosystems I
Spatial modelling of ecosystems I
14:00 - 15:00
Room: Salle 1
Contributions

14:00 PATOU, a scalable numerical model for complex spatio-temporal ecosystem dynamics: principles, methods, and first applications - François Rincon (IRAP, CNRS)

14:30 A new framework to explore spatial and scale dependency of biodiversity and ecosystems - Jules Treton
15:00 Small break
Small break
15:00 - 15:10
Room: Salle 1
15:10 Coevolution
Coevolution
15:10 - 15:40
Room: Salle 1
Contributions

15:10 Local adaptation of host-parasite coevolution on spatial networks - Saismit Naik (ISEM, University of Montpellier, CNRS)
15:50 Coffee break
Coffee break
15:50 - 16:15
Room: Salle de conférences

16:15 Discussion
Discussion
16:15 - 17:15
Room: Salle de conférences

19:30 Dinner
Dinner
19:30 - 21:30
mercredi 3 décembre 2025

09:00 Keynote: Jonathan Rolland (CNRS, CRBE Toulouse)
Keynote: Jonathan Rolland (CNRS, CRBE Toulouse)
09:00 - 09:50
Room: Salle de conférences **Title**: Conceptual and empirical bridges between micro- and macroevolution **Abstract**: Since the beginning of the 20th century and the modern synthesis, evolutionary biology has been divided between microevolution (below the species level) and macroevolution (above the species level). Conceptual frameworks, terminology and mathematical models remain largely separate among those scales, leading to several paradoxes, such as the paradox of stasis. In this talk, I will present some opportunities to unite scales exploring major questions that require bridging the gap between micro and macroevolution: For example: Why does the rate of evolution appear to accelerate close to the present time? Why is there stasis over long evolutionary timescales? Do bursts of phenotypic evolution and speciation occur at the same time? Do ecological interactions leave a predictable signature on macroevolution? I will also present some of the avenues explored in the last years in my research group, mostly related to adaptations across latitudinal clines and species range shifts.

09:50 Coffee break
Coffee break
09:50 - 10:30
Room: Salle de conférences
10:30 Spatial modelling of ecosystems II
Spatial modelling of ecosystems II
10:30 - 11:30
Room: Salle 1
Contributions

10:30 Impact of spatial heterogeneity on biodiversity-yield trade-offs in agricultural landscapes - Madeleine Kubasch (iEES, École polytechnique)

11:00 Interaction scales govern self-organized spatial structure and bistability in dryland ecosystems - Nathan Humbert (ISEM - Université de Montpellier)
11:30 Conclusion of the meeting
Conclusion of the meeting
11:30 - 12:00
Room: Salle de conférences

12:00 Lunch
Lunch
12:00 - 14:00

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