Guillaume Souchay's Avatar

Guillaume Souchay

@gsouchay.bsky.social

wildlife biologist (PhD), working at #OFB, specialized in Pop dynamics, interested in impact of #predation, #hunting #farming practice & #landscape alumni #ULaval #CEFE #Vogelwarte Sempach

1,448 Followers  |  1,847 Following  |  237 Posts  |  Joined: 14.09.2023  |  2.3087

Latest posts by gsouchay.bsky.social on Bluesky

Example of images with extremely low and extremely high error (MAE). Predictions obtained with the best models: DINOv2-LARGE trained with 0–3, 0–12 and 0–24 year-old individuals to predict the age of other individuals of 0–3, 0–12 and 0–24 year old, respectively, with the age predicted in years (secondarily converted in days for <3 years individuals here). The figure illustrates the influence of external factors on age prediction, like the quality of the image (‘Qual’) and the sex of the individual (e.g. old females were predicted to be older than they were), but high error can occur even for high-quality images of young males. Such errors partly reflect inter-individual variation in developmental progress (e.g. the 372 day-old female in the bottom row shows a blue tint that typically appears in older individuals).

Example of images with extremely low and extremely high error (MAE). Predictions obtained with the best models: DINOv2-LARGE trained with 0–3, 0–12 and 0–24 year-old individuals to predict the age of other individuals of 0–3, 0–12 and 0–24 year old, respectively, with the age predicted in years (secondarily converted in days for <3 years individuals here). The figure illustrates the influence of external factors on age prediction, like the quality of the image (‘Qual’) and the sex of the individual (e.g. old females were predicted to be older than they were), but high error can occur even for high-quality images of young males. Such errors partly reflect inter-individual variation in developmental progress (e.g. the 372 day-old female in the bottom row shows a blue tint that typically appears in older individuals).

📖Published📖

Check out our recent research article by Renoult et al. 👉 Vision transformers for age prediction from facial images in a wild primate 🐵 🌍 🧪

buff.ly/RVi7ULo

20.11.2025 12:01 — 👍 4    🔁 2    💬 1    📌 1
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France’s birds start to show signs of recovery after bee-harming pesticide ban Analysis shows small hike in populations of insect-eating species after 2018 ruling, but full recovery may take decades

[1/5] Les oiseaux insectivores français présentent de faibles signes de reprise après l’interdiction des néonicotinoïdes. L’analyse de + de 1900 sites révèle une hausse de 2% à 3% entre 2019 et 2022. Cette tendance reste fragile mais géographiquement significative. #biodiversity #France

20.11.2025 07:10 — 👍 78    🔁 44    💬 1    📌 2
Arctic fox on Bylot Island. Winter fur. Picture taken in May by Dominique Berteaux.

Arctic fox on Bylot Island. Winter fur. Picture taken in May by Dominique Berteaux.

In Molecular Ecology, we trace the origins of domestic Arctic fox lineages by comparing genomes of farmed and wild foxes. Congrats to Christopher Cockerill for leading the study; I contributed modestly with samples from Bylot Island. Read: bit.ly/4nRagIJ. 🧪🌿🌎🦊 #wildlife

15.11.2025 16:44 — 👍 56    🔁 8    💬 0    📌 2
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Pour un changement de paradigme en toxicologie | UQAM Un article publié dans Environmental Sciences Europe appelle au développement de pratiques agroécologiques.

Un collectif de 40 spécialistes, dont Louise Vandelac et Marie-Hélène Bacon (UQAM), appelle à un changement radical en toxicologie. Objectif : revoir normes et pratiques agricoles pour protéger santé, environnement et alimentation mondiale. #SantéPublique #AgricultureDurable #RechercheUQAM

14.11.2025 13:27 — 👍 1    🔁 1    💬 0    📌 1
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[THREAD] Le bleuet de France, un dogwhistle d'extrême-droite ?

À l'occasion de la commémoration du 11 novembre, j'ai lu sur ce réseau que le symbole du bleuet de France serait d'extrême droite.

Et non seulement cela m'a choqué, mais en plus cela m'a rendu profondément triste. Explications.

1/12 ⬇️

14.11.2025 09:31 — 👍 302    🔁 176    💬 13    📌 16

Les agriculteurs râlent souvent après les chasseurs qui ne tuent pas assez de sangliers selon eux (les dégâts aux cultures sont parfois énormes et engendrent une perte de revenu), donc oui, cela pourrait être une raison

14.11.2025 10:34 — 👍 0    🔁 0    💬 1    📌 0

#PhD position #job #behaviour 🦜
🧪🌎

12.11.2025 07:32 — 👍 2    🔁 0    💬 0    📌 0
Enquête nationale sur les tableaux de chasse à tir (hors grand gibier, gibier de montagne et d'Outre-mer) - Saison 2023-2024 Pour la saison 2023-2024, un échantillonnage probabiliste des chasseurs n’ayant pas déclaré leurs tableaux sur le questionnaire en ligne proposé par la FNC a également été effectué pour atténuer le biais de non-réponse. Cette nouvelle enquête permet d’initier l’examen des tendances des prélèvements pour de nombreuses espèces chassées, dont certaines vont être soumises à un processus de gestion adaptative.

Publication de @ofbiodiversite.bsky.social et #FNC des résultats de l'Enquête Nationale sur les Tableaux de #Chasse à tir (hors grand #gibier, gibier de montagne et d'OM)
pdf en libre service sur #HAL #openscience #ecologie 🧪🌍🇫🇷
ofb.hal.science/hal-05300255

28.10.2025 08:14 — 👍 1    🔁 0    💬 0    📌 0
Home - ISEC 2027 Call for Workshop Submissions, Deadline Nov 15th -- Submit Workshop Proposal Call for Roundtable Submissions, Deadline Nov 15th -- Submit Roundtable Proposal The International Statistical Ecology Conf...

The next International Statistical Ecology Conference (ISEC) will take place on January 8-15, 2027, in Mérida, México.

Calls for workshop and roundtable proposals now open, deadline Nov 15, 2025 (anywhere on earth).

Visit statisticalecology.org for more information. 🧪

Please share widely 📈🦋🐾

13.10.2025 17:52 — 👍 14    🔁 13    💬 2    📌 0

Super petit fil sur un article récent en géographie/écologie sur les interactions systèmes humains/naturels
🌎🧪 #ecology #geography #ecosystem

02.10.2025 07:01 — 👍 2    🔁 0    💬 0    📌 0
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Le réseau des chambres d'agriculture depuis leur régionalisation Les chambres d’agriculture, créées en 1851 et devenues dans les années 1960 un vecteur majeur du conseil aux paysans, jouent aujourd’hui encore un rôle central auprès des agriculteurs dans un contexte...

Les ressources (aux 3/4 publiques) des chambres d’agriculture progressent ➡️ 794 M€ VS 770 M€ en 2018.

La Cour recommande plus d’efficience, de cohérence avec les nécessités des transitions, de fonctionnement en réseau et une plus forte tutelle de l’État.

Lire le rapport 👇

01.10.2025 08:50 — 👍 2    🔁 4    💬 0    📌 0
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Les insecticides à base d’acétamipride chez les particuliers bientôt interdits dans l’UE Générations Futures, qui était en première ligne dans l’opposition à la réintroduction de l’usage agricole de l’acétamipride en France, « appelle désormais à son interdiction totale au niveau européen, y compris en agriculture ».

Les insecticides à base d’acétamipride chez les particuliers bientôt interdits dans l’UE

30.09.2025 18:00 — 👍 26    🔁 6    💬 3    📌 1
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Shifting the baseline for waterbird and seabird conservation in europe, risk assessment over one century - Biodiversity and Conservation European waterbird and seabird populations have been threatened by anthropogenic activities for decades. Effective strategies are needed to restore both populations and their habitats. However, the temporal period used to define the state of reference when setting restoration targets requires careful considerations to avoid the risk of shifting baseline. A risk of shifting baseline occurs if a population decreases before the time period used to set a baseline. In Europe, most bird monitoring schemes started after the 1970s, yet significant changes in population trends were already reported earlier in the 20th century. We assessed the risk of shifting baseline for 88 out of 170 waterbird and seabird species breeding in Europe. Building on historical ecology, we reconstructed population trends between 1900 and 2018 from information collected in both historical literature and monitoring scheme reports. Historical trends confirm variations in population trends for several waterbird and seabird species over the period 1900-1970, with 35 decreasing species, 38 fluctuating species, 15 increasing species and 82 species with unknown trends. A high risk of shifting baseline was identified for 28 species, for which restoration targets must consider historical trends spanning at least a century. The risk was low for 12 species, probably low for 41 species, probably high for 7 species and uncertain for 82 species. Our study highlights the crucial role of historical data collected prior to the large-scale implementation of standardized abundance monitoring, as it allows for the identification of appropriate baselines to guide the restoration of waterbird and seabird breeding populations.

Shifting the baseline for waterbird and seabird conservation in Europe: risk assessment over one century

link.springer.com/article/10.1...

🌍 🧪 🦤 #Ornithology

29.09.2025 14:41 — 👍 10    🔁 5    💬 0    📌 0

Nouvel article de Patrick #Giraudoux @chrono-env.bsky.social dans le Bull. #Académie #Vétérinaire 🇫🇷 sur les conséquences insoupçonnées de l'éradication de la #rage vulpine #OneHealth #Nexus en France #ecologie 🌍🧪 #renard 🦊
academie-veterinaire.fr/fileadmin/us...

29.09.2025 06:50 — 👍 1    🔁 0    💬 0    📌 0
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Did you know that our blog series with @aer-ese-bes.bsky.social, Field Diaries, is looking for new participants? 💭🧪

We've already shared a range of brilliant stories spanning waterfowl research to considering the sustainability of homestead farming! 🦆🌏

Find out more & get involved: bit.ly/4n8pyJ4

24.09.2025 10:02 — 👍 3    🔁 5    💬 0    📌 0

À l'origine un déchet de l'industrie pétrolière, l'hexane est un solvant utilisé à partir des années 60 pour aller gratter les 10 à 20% d'huile que les procédés mécaniques ne parviennent pas à extraire des graines d'oléagineuses. Il est alors utilisé en remplacement de produits cancérigènes [1/2]

18.09.2025 14:57 — 👍 29    🔁 18    💬 3    📌 1

Article intéressant mais il manque qq infos sur l'impact du renouvelable sur la biodiversité, notamment dans le point sur la l'espace pris par les ENR, certes faibles en comparaison des infrastructures autoroutières mais bien souvent dans des hot-spot pour la biodiv peu artificialisés

18.09.2025 08:46 — 👍 0    🔁 0    💬 0    📌 0

#nativewikdlife 🌏🧪

12.09.2025 05:30 — 👍 12    🔁 2    💬 2    📌 1

"Our results suggest that some of the same genetic changes that make the human brain unique also made humans more neurodiverse."

09.09.2025 14:14 — 👍 2    🔁 1    💬 0    📌 0

#science #ecologie #mediation #transfert 🌍🧪🇫🇷

02.09.2025 13:14 — 👍 3    🔁 1    💬 0    📌 0
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À Montpellier, la Métropole et des chercheurs s’engagent pour la biodiversité - Hérault Tribune Ce vendredi 29 août, après trois ans de collaborations officieuses, le CNRS, l’université de Montpellier, l’Office français de la biodiversité (OFB) et plusieurs partenaires ont officialisé leur coopé...

nouveau partenariat @ofbiodiversite.bsky.social @cnrsecologie.bsky.social @ird-fr.bsky.social @umontpellier.bsky.social et la ville de #montpellier officialisent leur coopération au travers du projet BRAM #science #médiation #ecologie #territoire
www.herault-tribune.com/articles/a-m...

02.09.2025 12:15 — 👍 6    🔁 1    💬 0    📌 1

Bon, l'incompétent @terreaterre.bsky.social a encore pondu une bouse pour le média techno fasciste.

Évidemment, pas de sources,ça serait trop simple de prouver la véracité de ce qu'on dit.

Mais surtout,des affirmations fausses :

29.08.2025 10:58 — 👍 23    🔁 9    💬 1    📌 1
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Biochar from human waste could solve global fertiliser shortages, study finds Excrement contains nutrients needed for crop growth and a new source of them could cut farming’s huge CO2 output Charcoal made from human waste could help solve fertiliser shortages as well as reduce pollution and energy use, a study has found. Biochar is a form of charcoal made from organic matter treated at high heat, which is often used on farming soil as a fertiliser. The process also removes carbon from the atmosphere, making it a useful carbon sink. Continue reading...

Biochar from human waste could solve global fertiliser shortages, study finds

11.08.2025 19:40 — 👍 92    🔁 23    💬 12    📌 10
Title and author list for the synthesis paper titled "Understanding and Predicting Population Response to Anthropogenic Disturbance: Current Approaches and Novel Opportunities" published in Ecology Letters.

Title and author list for the synthesis paper titled "Understanding and Predicting Population Response to Anthropogenic Disturbance: Current Approaches and Novel Opportunities" published in Ecology Letters.

The latest paper from the DISCAR synthesis group is out at Ecology Letters! We discuss the key approaches to predicting human impacts on wildlife populations, highlighting avenues for incorporating indirect effects, such as energetic modelling. doi.org/10.1111/ele....

23.08.2025 10:40 — 👍 50    🔁 26    💬 2    📌 2
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Understanding and Predicting Population Response to Anthropogenic Disturbance: Current Approaches and Novel Opportunities Here, we provide a cross-taxa overview of key methodological approaches and model elements that are used to model the effects of human disturbance on wildlife populations. We discuss how these modell...

New publication by @cassiespeakman.bsky.social and colleagues incl. @oaggimenez.bsky.social @cnrsecologie.bsky.social @ofbiodiversite.bsky.social @robsalgo.bsky.social on approaches to investigate wildlife response to human activities #ecology 🌍🧪
doi.org/10.1111/ele....

26.08.2025 07:50 — 👍 14    🔁 3    💬 0    📌 0
Multiple Early Career Faculty Positions in Ecology
 
The Department of Biological Sciences at the University of Notre Dame invites applications for multiple, tenure-track assistant professor positions that will enhance existing institutional excellence in ecology. We are searching broadly for creative and collaborative individuals (1) working at any spatial scale, from local to global, in any system, (2) studying any level of biological organization, from genes to ecosystems, and (3) using any mode of inference, from empirical to theoretical. Applicants should demonstrate research excellence that crosses traditional disciplinary boundaries; ongoing growth in the department will emphasize new hires that use quantitative and/or integrative approaches to study ecological processes. Postdoctoral experience is desirable in applicants. Successful candidates will engage with and benefit from UNDERC, Notre Dame’s 8000-acre environmental field station and home to NEON’s Great Lakes domain, superb on-campus chemical and genomic analytical facilities, an experimental research facility located close to campus, cross-disciplinary interactions through multiple centers and institutes including the Environmental Change Initiative, and a unique Interdisciplinary Graduate Training Program in Environment and Society. New faculty will benefit from Notre Dame’s recent campus-wide Strategic Framework that included the Just Transformations to Sustainability Initiative. Modern research facilities exist in a new environmental research building, which opened in 2025.

Multiple Early Career Faculty Positions in Ecology The Department of Biological Sciences at the University of Notre Dame invites applications for multiple, tenure-track assistant professor positions that will enhance existing institutional excellence in ecology. We are searching broadly for creative and collaborative individuals (1) working at any spatial scale, from local to global, in any system, (2) studying any level of biological organization, from genes to ecosystems, and (3) using any mode of inference, from empirical to theoretical. Applicants should demonstrate research excellence that crosses traditional disciplinary boundaries; ongoing growth in the department will emphasize new hires that use quantitative and/or integrative approaches to study ecological processes. Postdoctoral experience is desirable in applicants. Successful candidates will engage with and benefit from UNDERC, Notre Dame’s 8000-acre environmental field station and home to NEON’s Great Lakes domain, superb on-campus chemical and genomic analytical facilities, an experimental research facility located close to campus, cross-disciplinary interactions through multiple centers and institutes including the Environmental Change Initiative, and a unique Interdisciplinary Graduate Training Program in Environment and Society. New faculty will benefit from Notre Dame’s recent campus-wide Strategic Framework that included the Just Transformations to Sustainability Initiative. Modern research facilities exist in a new environmental research building, which opened in 2025.

Multiple ecology faculty positions at @notredame.bsky.social. Apply at apply.interfolio.com/171650. (1/2). 🌎🌐🧪

21.08.2025 17:09 — 👍 49    🔁 63    💬 2    📌 0
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Aller au-delà de l’écologie politique J’aime bien la définition de l’écologie politique trouvée sur Wikipédia : « l’écologie politique est une approche culturelle appliquée de l'écologie (sous-entendu scientifique) pour l'espèce humaine —...

regard de Daniel #Gilbert, écologue et directeur adjoint de la ZA Arc Jurassien, sur l'écologie politique, sa "définition", les limites des concepts utilisés (et souvent mal assimilés) de la science ...
#écologie #politique 🌍
à lire (si ce n'est déjà fait)

www.linkedin.com/pulse/aller-...

19.08.2025 08:38 — 👍 1    🔁 0    💬 0    📌 0
Actus N°12/2025. Fin de la PAC ,Moisson 2025, Loi Duplomb , Sandrine Rousseau.Réalités économiques
YouTube video by Sam, agriculteur indépendant Actus N°12/2025. Fin de la PAC ,Moisson 2025, Loi Duplomb , Sandrine Rousseau.Réalités économiques

une vidéo sur l'actualité agricole par un agriculteur & conseillé agricole indépendant du Loiret
je ne le connaissais pas, je n'étais pas prêt 🥲
#agriculture #loiduplomb #PAC #moisson
youtu.be/f31pxGj5Qkc?...

21.07.2025 08:51 — 👍 1    🔁 0    💬 1    📌 0
picture of a harvest mouse captured in Britain, inside INRA trap

picture of a harvest mouse captured in Britain, inside INRA trap

small picture of a harvest #mouse, captured in #Britain 🇫🇷 during our first session of summer to estimate small #mammal abundance inside #agricultural plot.
#predator-prey #relationship in agri landscape. @ofbiodiversite.bsky.social #ecology
🌍🧪

08.07.2025 15:17 — 👍 10    🔁 0    💬 1    📌 2

🧪🌎

30.06.2025 14:59 — 👍 1    🔁 1    💬 1    📌 0

@gsouchay is following 20 prominent accounts