Yoan Fourcade

Co-occurrence patterns of introduced terrestrial flatworms in metropolitan France revealed by citizen science - Biological Invasions Terrestrial flatworms are a group of successful carnivorous invaders that have been introduced to many regions outside their native range. In France, six different species have been recorded in significant numbers over the past 20 years, with a recent increase in observations. These include predators of earthworms, gastropods and soil arthropods. Their presence raises concerns about their potential to disturb communities of soil-dwelling organisms. Here, we aimed to describe patterns of co-occurrence between these species in France, using a national inventory of alien flatworms coupled with estimates of potential co-occurrence derived from ecological niche models trained at the global scale. We showed that, although alien predatory flatworms are relatively widespread in France, they co-occur less frequently than expected simply based on each species’ respective environmental suitability, i.e., they tend to be found alone and not in association with other alien flatworm species. However, ecological niche models indicate a high potential for more frequent co-occurrences in the future. We hypothesize that their limited dispersal ability and their relatively recent introduction has confined most species close to their introduction sites. However, if they eventually fill out their potential range, predators of different taxonomic groups will co-occur more frequently, leading to greater predation pressure in invaded ecosystems. Our conclusions shed light on the current and future co-occurrence patterns of alien predatory flatworms in France. Understanding how they translate in the field in terms of predation and competitive interactions will be crucial for predicting the impact of flatworm invasion on soil ecosystems.

Citizen science shows invasive flatworms in France 𝙘𝙤-𝙤𝙘𝙘𝙪𝙧 𝙡𝙚𝙨𝙨 𝙤𝙛𝙩𝙚𝙣 𝙩𝙝𝙖𝙣 𝙚𝙭𝙥𝙚𝙘𝙩𝙚𝙙.🧪
For now, they seem to avoid each other — but models predict more overlap ahead. And more damage to soil ecosystems.
New paper: doi.org/10.1007/s105...

Stage M2 - iEES - 2026 | Yoan Fourcade Un stage de niveau Master 2 (6 mois à partir de début 2026) est ouvert au sein du laboratoire iEES-Paris, et sera basé à l'Université Paris-Est Créteil. Le·la stagiaire explorera comment les propriét...

Stage de Master 2 (6 mois à partir de début 2026) à iEES-Paris, basé à l'Université Paris-Est Créteil.

Le·la stagiaire explorera comment les propriétés du sol peuvent contribuer, et dans quelles conditions, aux modèles de distribution des espèces.

Plus de détails ici: bit.ly/4pkGqP4

Global phylogenetic and functional structure of rodent assemblages nsojournals.onlinelibrary.wiley.com/doi/10.1002/...

iEES Paris Site de iEES Paris

Trois postes d’ATER ouverts à l’UPEC pour 2025-2026 sont rattachés à notre unité iees-paris.fr.

N°0282, section 66
N°0315 : sections 67/64
N°1033 : sections 68/ 67/ 66

Postuler avant le 21/05/2025 : bit.ly/2DpKR5y

Fiche de poste | Lise Dupont Un contrat d’un an de post-doctorat est proposé à iEES-Paris dans l’équipe i-SOL sur le site de Créteil à l’UPEC pour réaliser une étude de génomique du paysage sur un couple papillon- parasitoïde. Le...

A one-year post-doctorate contract is offered at iEES-Paris in the i-SOL team ( Créteil, FRANCE) to carry out a landscape genomics study on a butterfly-parasitoid pair. The post-doctoral work will involve the bioinformatic and statistical analysis of the data.

www.linkedin.com/posts/lise-d...

A qualitative model suggests that the soil ecosystem is resilient to the invasion by the land flatworm Obama nungara - Biological Invasions Soil plays a critical role in ecosystem functioning and on the provision of ecosystem services. The soil fauna, especially earthworms, contributes to these processes through their action on the physic...

In our latest paper from the PLATWORM project (ANR-21-CE02-0016), we highlighted the value of qualitative models for assessing the impact of invasive species on ecosystems. link.springer.com/article/10.1...

Population Dynamics of the Exotic Flatworm Obama nungara in an Invaded Garden Fine-scale temporal monitoring of the invasive land flatworm Obama nungara was obtained during a 4-year survey of a French private garden, where up to 1585 O. nungara were recorded in 1 month. Popula...

Congratulations to Shanèze Noël for her first first-authored paper from her thesis.

onlinelibrary.wiley.com/doi/10.1002/...

The first many-analysts study in ecology is finally published! 🥳🙌

300+ coauthors and 5+ years, this was a massive effort by @elliotgould.bsky.social Hannah Fraser Tim Parker and co.

Open access 👉 bmcbiol.biomedcentral.com/articles/10....

Can organic farming in Southeast Asia help to conserve beetle biodiversity while aiding pest control? A new Report published as FirstView in 'Environmental Conservation'. #beetles #biodiversity #agriculture #organic 🌍🌐🐞

Yoan Fourcade on LinkedIn: PhD - climate connectivity - iEES UPEC 📢 PhD position in ecology ❗ Last days to apply ! ❗ We have a 3-year PhD position available at iEES Paris to investigate ecological connectivity in relation…

📢 We have a #PhD position available in #ecology at iEES Paris to investigate ecological connectivity and climate change.

🇬🇧 / 🇺🇸 bit.ly/42aW0Uf

📢 Nous proposons une #thèse de #doctorat en #écologie à iEES Paris sur la connectivité écologique en lien avec le changement climatique.

🇫🇷 bit.ly/3PwVfNx