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Mathilde L. Tissier

@mathildetissier.bsky.social
2.3K followers 501 following 37 posts

Scientist, passionate about life, wildlife & vitamin B3! | Conservation, biodiversity, nutrition, agroecology, behavior, health | Liber Ero (CA), CNRS researcher (FRA), QCBS (QC) | She/her FR/EN | 🐿️🍁🐝🌻🌾 www.sppb-sffb.net

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Reposted by Mathilde L. Tissier
Judy Trinh @judytrinh.bsky.social · 22/09/2026
Seniors who were protesting Mark Carney’s Bill c39 and fast tracking of environmental reviews arrested and charged with trespassing on Parliament Hill.
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Radio-Canada Info @info.radio-canada.ca · 10/09/2026
rc.ca
Ottawa renonce à contourner la loi sur les espèces en péril pour les grands projets
Des associations affirment toutefois qu'Ottawa peut toujours contourner la Loi par d'autres moyens.
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Ainslie Cruickshank @ainsliecruickshank.bsky.social · 10/09/2026
It's been another tough year for gray whales — as of mid-August 187 have washed up along the west coast of North America, many of them showing signs of starvation. I wrote up a summary of what's been happening over the last few years for @sciam.bsky.social www.scientificamerican.com/article/gray...
scientificamerican.com
Gray whales are washing up dead on the West Coast. The reason is alarming
Up and down the Pacific coast, dead gray whales are mysteriously washing ashore—and scientists think they know why
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Mathilde L. Tissier @mathildetissier.bsky.social · 04/09/2026
This parliamentary petition is a call for #pesticide regulation to be science-based and precautionary in Canada. Sign and share. www.ourcommons.ca/petitions/en...
ourcommons.ca
Petition e-7742 - Petitions
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Reposted by Mathilde L. Tissier
Mathilde L. Tissier @mathildetissier.bsky.social · 04/09/2026
Pétition parlementaire pour que la réglementation des #pesticides au Canada repose sur des données scientifiques et s'appuie sur le principe de précaution. www.ourcommons.ca/petitions/en... À circuler.
ourcommons.ca
Petition e-7742 - Petitions
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Mathilde L. Tissier @mathildetissier.bsky.social · 04/09/2026
Pétition parlementaire pour que la réglementation des #pesticides au Canada repose sur des données scientifiques et s'appuie sur le principe de précaution. www.ourcommons.ca/petitions/en... À circuler.
ourcommons.ca
Petition e-7742 - Petitions
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Mathilde L. Tissier @mathildetissier.bsky.social · 04/09/2026
This parliamentary petition is a call for #pesticide regulation to be science-based and precautionary in Canada. Sign and share. www.ourcommons.ca/petitions/en...
ourcommons.ca
Petition e-7742 - Petitions
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Reposted by Mathilde L. Tissier
IPBES @ipbes.net · 18/08/2026
Did you know? 🐝 Pollinators support 5-8% of global crop production. Researchers observed that managed honeybees can’t compensate for wild pollinator losses nor keep pace with the growth in pollinator-dependent crops. Read more in The Guardian: ow.ly/o3IH50ZAq5p
Close-up of a fuzzy bumblebee collecting nectar from the bright yellow petals of a flower.
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WildPosh Project @wildposh.eu · 12/08/2026
Did you know Europe is running out of taxonomists - the experts who identify pollinator species? 🐝 The Pollinator Academy is an open-source platform from 25 European institutes, offering free courses, ID tools & field guides for all experience levels. 📖 👉 Check them out: pollinatoracademy.eu
pollinatoracademy.eu
Pollinator Academy
The Pollinator Academy is a learning platform with integrated taxonomic tools and information on European pollinators.
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Marco Festa-Bianchet 🇨🇦 @marcofesta.bsky.social · 12/08/2026
Lettre par 5 anciens présidents du Comité sur la Situation des Espèces en Péril au Canada, dont moi, dénonçant le document de travail sur les projets majeurs fédéraux qui propose d'ignorer la Loi sur les Espèces en Péril. Je suis le contact pour médias francophones www.sfu.ca/~amooers/sci...
sfu.ca
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Ran Blekhman @blekhman.bsky.social · 09/08/2026
Huge faculty recruitment effort at the University of Chicago -- a division-wide, open-rank search looking to hire about 20 faculty across 5 research areas in biology. Come be our colleague! Full announcement: uchicago.app.box.com/s/ckih9zv3rj...
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Mathilde L. Tissier @mathildetissier.bsky.social · 07/08/2026
"Le dérèglement climatique n'est plus une menace d'un avenir plus ou moins proche. Il est le présent. *Pour nous agriculteur, il est devenu un bourreau* ." www.lesechos.fr/idees-debats...
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Mathilde L. Tissier @mathildetissier.bsky.social · 06/08/2026
Thank you WPC. "Sheila Colla was widely admired. She was far more than a brilliant scientist and conservation leader. She was a fierce advocate for environmental and social justice and was incredibly skilled and determined at bridging the gap between science, community, and politics."
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Mathilde L. Tissier @mathildetissier.bsky.social · 06/08/2026
Thank you WPC. "Sheila Colla was widely admired. She was far more than a brilliant scientist and conservation leader. She was a fierce advocate for environmental and social justice and was incredibly skilled and determined at bridging the gap between science, community, and politics."
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Le Devoir @ledevoir.com · 02/08/2026
Ce que la famille Trump trame en Albanie peut tout à fait être compris comme une forme de colonialisme privé.
ledevoir.com
Révolution des flamants roses
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Matt Bertone @bertonemyia.bsky.social · 01/08/2026
Sometimes you've gotta go metallic to mimic your model! This common tropical hover #fly at the top is a convincing mimic of the local orchid #bees in the genus #Euglossa (bottom). #FlySchool2026 #Syrphidae: #Ornidia obesa Soltis Center, Costa Rica
Two metallic green winged insects on a white background, one at the top and one at the bottom. The top one is a hover fly and the bottom is an orchid bee.
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Nahel Belgherze @wxnb.bsky.social · 31/07/2026
Bordeaux, France, has now recorded more days above 40°C in 2026 alone than during the entire 105-year period from 1920 (when observations began) to 2025. This is deeply shocking.
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Marco Festa-Bianchet 🇨🇦 @marcofesta.bsky.social · 31/07/2026
Liber Ero postdoc deadline Nov 1. Exceptional opportunity for research in conservation in Canada - highly competitive, best to have gov't and Indigenous partners liberero.ca
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Le Devoir @ledevoir.com · 27/07/2026
Les conséquences s’annoncent «catastrophiques», a affirmé la ministre française de la Transition écologique.
ledevoir.com
La faune piégée dans l’enfer des incendies en France
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Actualités françaises 🇫🇷 @news-flows-fr.bsky.social · 22/07/2026
Que dit la science sur l'acétamipride et le flupyradifurone, les deux pesticides qui pourraient être réintroduits après l'adoption de la loi d'urgence agricole ? De nombreux chercheurs pointent les risques de ces insecticides pour les pollinisateurs, mais aussi pour d'autres animaux ainsi que...
franceinfo.fr
Que dit la science sur l'acétamipride et le flupyradifurone, les deux pesticides qui pourraient être réintroduits après l'adoption de la loi d'urgence agricole ?
De nombreux chercheurs pointent les risques de ces insecticides pour les pollinisateurs, mais aussi pour d'autres animaux ainsi que les humains, malgré leur autorisation dans l'Union européenne.
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Canada's National Observer @nationalobserver.com · 21/07/2026
One of the lesser-known services Thomson Reuters offers is Consolidated Lead Evaluation and Reporting, or CLEAR, a database that compiles individuals’ private information not normally accessible to law enforcement.
nationalobserver.com
Thomson Reuters to share American information with ICE in new deal
While the company insists it has "safeguards" in place to prevent misuse of the information, some experts say the US$125-billion deal is a "red flag."
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franceinfo @franceinfo.fr · 16/07/2026
Des épisodes orageux ont provoqué des dégâts dans plusieurs départements mercredi. Le plus touché a été l'Ardèche.
l.franceinfo.fr
"On a pris des boules de pétanque sur la tête" : en Ardèche, des orages et des averses de grêle d'une violence "jamais vue"
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Reposted by Mathilde L. Tissier
Actus FR @actusfr.bsky.social · 16/07/2026
"Des grêlons gros comme le poing" : la France frappée par de violents orages 🗞️ TF1 Info - 🕐 15/07 22:04 #actu #news #presse #tf1info
tf1info.fr
"Des grêlons gros comme le poing" : la France frappée par de violents orages
Les premiers orages sont arrivés en Ardèche ce mercredi, accompagnés de grêle et de vent jusqu’à 140 km/h en rafales. En Charente-Maritime, les habitants ont également dû faire face à des intempéries violentes faisant des dégâts importants. Ce soir e... [1747 chars]
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Reposted by Mathilde L. Tissier
Sud Ouest @sudouest.fr · 16/07/2026
Vignobles endommagés, toitures éventrées, voitures abîmées : un violent orage de grêle cause des dégâts importants en Ardèche
l.sudouest.fr
Vignobles endommagés, toitures éventrées, voitures abîmées : un violent orage de grêle cause des dégâts importants en Ardèche
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ici Drôme Ardèche @dromeardeche.ici.fr · 16/07/2026
Grêle à Aubenas : résidence séniors évacuée, des dizaines de personnes relogées et des dégâts considérables. ➡️ l.ici.fr/vZzC
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The Globe and Mail @theglobeandmail.com · 16/07/2026
theglobeandmail.com
Immigration department pauses applications to sponsor parents, grandparents to settle in Canada
Ottawa cut its target for new permanent residents under the program to 15,000 a year in the 2025 budget
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Christine N Meynard @cnmeynard.bsky.social · 02/06/2026
Encore un recrutement @cbgpmontpellier.bsky.social cette fois-ci sur un profil IE Data Scientist en écologie, forte composante bases de données. Voir les détail dans l'annonce!
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Kavitha Kannan @kavskannan.bsky.social · 25/06/2026
I ate a lot of mangoes this summer in India, and somehow kept wondering how this fruit comes to be. My first science write-up dives deep into it, and is featured in today’s edition of The Hindu. www.thehindu.com/sci-tech/ene...
thehindu.com
Kingmakers: Meet the insects that make India’s famed mangoes
Discover how vital insects, like bees, play a crucial role in pollinating India's beloved mangoes and their conservation.
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Marco Festa-Bianchet 🇨🇦 @marcofesta.bsky.social · 16/06/2026
It's a red kangaroo. Always amazed by people's weird decisions. And just how does one smuggle a roo into Canada? If someone is willing to fork out 6 grands, the incentive is there. www.cbc.ca/news/canada/...
cbc.ca
Runaway marsupial on Montreal's South Shore sparks animal trafficking concerns | CBC News
For the last few days, a small marsupial has been on the loose on Montreal’s South Shore, after it likely escaped from illegal captivity, say animal rights advocates and Quebec's Environment Ministry.
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Thomas Gerbet @thomasgerbet.bsky.social · 08/06/2026
Des chercheurs de 13 universités dénoncent le projet de loi C-30 qui permettra au gouvernement Carney d’invalider la science. Il donnera le pouvoir au Conseil des ministres de réautoriser des pesticides risqués interdits par Santé Canada. ici.radio-canada.ca/nouvelle/225...
ici.radio-canada.ca
Ottawa veut pouvoir réautoriser des pesticides interdits
Avec le projet de loi C-30, le gouvernement de Mark Carney pourra invalider des décisions basées sur la science de Santé Canada au sujet des pesticides.
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Mathilde L. Tissier @mathildetissier.bsky.social · 08/06/2026
Comme nous l'expliquons dans une lettre au sujet du projet de loi C-30 "Il n’existe aucun fondement scientifique ou autre motif raisonnable pour justifier qu’une décision réglementaire soit infirmée par le Conseil des ministres après que Santé Canada a mené des examens approfondis."
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S Otto @sarperotto.bsky.social · 22/05/2026
Even Harper 'Did Not Put Extinction on the Table' @thetyee.ca thetyee.ca/News/2026/05... by @sarahcox.bsky.social Please submit comments on Major Projects proposal by June 7 www.canada.ca/en/one-canad.... Some projects can be approved even if they drive species extinct & proceed without assessment
thetyee.ca
Even Harper ‘Did Not Put Extinction on the Table’ | The Tyee
Carney’s proposal to allow major projects that threaten species at risk is ‘morally wrong,’ former environment minister says.
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beespeaker @loriweidenhammer.ca · 02/06/2026
Love those Sitka bumble bees with the classic fluffy pink butt! #mcloughlingardens #bees
female bumble bee sipping nectar from snowberry
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CNRS @cnrs.fr · 01/06/2026
#Communiqué 🗞️ La France lance Dynabiod, un programme de recherche sur la biodiversité terrestre. Piloté par le @cnrs.fr et le @mnhn.fr, il vise à comprendre l’impact des activités humaines sur les plantes et invertébrés pour mieux protéger les écosystèmes. 👉 www.cnrs.fr/fr/presse/fr...
France 2030 : le MNHN et le CNRS lancent Dynabiod, un programme national de recherche dédié à la biodiversité terrestre
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Camille Troisi @camilletroisi.bsky.social · 01/06/2026
🚨We're hiring again, this time for a research assistant position 🚨 The position is to help with a project looking at learning and social behaviour in birds along an urban gradient Position at @ceec-research.bsky.social 📆28th June deadline More info: shorturl.at/vBxiW #ringing #fieldwork
Great tit standing on a branch. 
Photo credit: Alizée Vernouillet
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Susan Johnston @susanjohnston.bsky.social · 01/06/2026
📣🧬 Postdoc Alert🧬📣 We are hiring a 2+ year NERC-funded postdoc at Edinburgh Uni investigating causes and consequences of sex differences in recombination in house sparrows in Norway. Informal enquiries welcome at Susan.Johnston@ed.ac.uk 🙂 Details here: elxw.fa.em3.oraclecloud.com/hcmUI/Candid...
A female and male sparrow stand on a wooden post. Photo by Peter S. Ranke.
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Larry Neufeld @larryneufeldsk.bsky.social · 29/05/2026
Canada’s nature strategy needs science and transparency, not spending cuts www.hilltimes.com/2026/05/28/c...
hilltimes.com
Canada’s nature strategy needs science and transparency, not spending cuts - The Hill Times
Protecting biodiversity requires more than targets on paper. It depends on sustained investment in three pillars of scientific capacity: long-term monitoring, scientific expertise and recovery infrast...
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Mathilde L. Tissier @mathildetissier.bsky.social · 31/05/2026
Bravo!
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Le Devoir @ledevoir.com · 26/05/2026
Déçu par les reculs environnementaux à Ottawa, il devrait annoncer sa décision mercredi.
ledevoir.com
L’ex-ministre Steven Guilbeault quittera la vie politique
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Paul Williams @paulwilliamsnhm.bsky.social · 22/05/2026
New evolutionary tree for all of the world's bumblebee species, from (1) slow-evolving nuclear genes, (2) fast-evolving mitochondrial genes, and (3) results from genomic data, to provide a complete starting point for comparative studies of all bumblebees www.researchgate.net/publication/...
Evolutionary tree for all 289 extant accepted published bumblebee species from 93 million MCMC generations (post convergence) by BEAST 2 for two mitochondrial genes, four nuclear genes, and ge-nomic-supported group priors, with outgroups removed. Bayesian posterior support values for each node are shown with node and descendant branch colours indicating values from blue for high values to red for low values. Selected groups are indicated with larger spots: pale blue LT/LG for long-tongued Lowland Grassland species; pale green ST/MG for short-tongued Montane Grassland species; black spots for parasitic or ‘cuckoo’ species that lack workers, including the subgenus Psithyrus and B. inexspectatus, B. hyperboreus, B. natvigi. Subgenera are named in the outer grey ring. Taxon names not appearing in this figure are interpreted as synonyms (see text).
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Greg Owens @gregowens.bsky.social · 20/05/2026
UVic is hiring a Terrestrial Plant Ecologist Assistant Professor! Come join our department! We're nice and Victoria is awesome. www.uvic.ca/science/biol...
uvic.ca
Faculty Position in Terrestrial Plant Ecology - University of Victoria
Department: Biology                 &am...
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Ryan Katz-Rosene, PhD @ryankatzrosene.bsky.social · 12/05/2026
Very cool version of this monthly global average surface temperature anomaly chart showing both El Niño and La Niña years
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Aerin Jacob, PhD @aerinj.bsky.social · 10/05/2026
Who do I know currently or recently serving on the council, executive, or similar leadership role in scientific professional societies and nature-related clubs in Canada?
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TF1 Info - Actualités du jour en direct : Actualité en France e… @tf1info.fr.web.brid.gy · 29/04/2026
tf1info.fr
VÉRIF' - Les ours mangent-ils vraiment des champignons toxiques pour ressentir leurs effets psychoactifs ?
Une publication en ligne nous explique qu'en Russie et en Amérique du Nord, des ours consomment des champignons toxiques pour leurs effets psychoactifs. Ce message s'accompagne d'une vidéo sur laquelle on observe un ourson en quelque sorte "drogué" après avoir mangé une amanite tue-mouches. Gare à cette séquence, tirée d'un film de 1988 : les chercheurs étudiant le comportement des ours n'observent pas ce type d'habitudes alimentaires à l'état sauvage.
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🌾 Dr. Liz Anna Kozik 🌾 @chaseprairie.bsky.social · 21/04/2026
quick, look at an Andrena vs Colletes comparison before it becomes irrelevant, until like July. Colletes are big spring guys and only show up rarely later in the year.
An image documenting multiple bee species with ID tips
Andrena:
Usually looks like a black bug in a fur coat
Some Andrean will eat anything (Generalists)
Including A. dunningi, a black bug in a brown fur coat, some hair on head, and no colored hair on abdomen
A. milwaukeensis, a black bug in a longer golden-red fur coat. Thorax is all orangey rust fur, top of head has some hair, and T1-T2 have orange hair too

But many Andrena are picky! (Specialists)
A. erigeniae is a spring beauty specialist
A. erythronii is a trout lily specialist
Both of them are black with a soft, sparse gray-fur thorax

Colletes-
C. inaequalis is the Colletes most likely spotted
They are fluffy yellow thorax, fluffy face, and black abdomen with strong white/cream banding.
Likes: Willows and fruit trees (pink apple blossoms, cherry, pear, plum). The Key with Colletes is a heart-shaped face.
Less common is C. thoracicus, which is like C. inaequalis, but more red/rust/orangeTiny Bee SPRING SHOWDOWN:
Andrena (more common) vs Colletes (more cute, IMO)

Their pollen zones on female bees are different, with Andrena having more of a "knee-pit" / armpit collection that looks like a bulky leg warmer. Colletes is more divided between tibia and femur

Their wings have slight differences, with different scaled submarginal shapes. Additionally, andrena has a straight line where Colletes tends to have an S shape in the middle of their wing

Their butts (abdomens) are different, with proportions exaggerated here. On Andrena T3 and T4 are bigger than T1 and T2, while on Colletes, the opposite is true

Head shapes:
Andrena has a square/rectangular head, while Colletes has a heart-shaped head. They're both cute.
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The Washington Post @washingtonpost.com · 25/04/2026
Breaking news: Multiple scientists who serve on an independent board established to guide the nation’s nearly $9 billion basic science funding agency were terminated from their positions Friday by President Trump.
washingtonpost.com
Trump ousts National Science Board members
Members of the independent board that guides the National Science Foundation said they received a notice from the White House that their position was being terminated.
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Mathilde L. Tissier @mathildetissier.bsky.social · 24/04/2026
www.inee.cnrs.fr/fr/cnrsinfo/...
inee.cnrs.fr
La France doit privilégier la conservation des pollinisateurs plutôt que l'utilisation des pesticides
Les insectes pollinisateurs ont décliné de 40 à 50% entre 1980 et 2020, en grande partie du fait de l’usage massif des pesticides, notamment les néoni
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CNRS Écologie & Environnement @cnrsecologie.bsky.social · 24/04/2026
#RésultatScientifique🔎 Une lettre publiée dans Science et rédigée par un consortium d’écologues de la pollinisation incite vivement l’Etat français à refuser la proposition du sénateur Duplomb consistant à réautoriser l’usage de deux néonicotinoïdes. ➡️ www.inee.cnrs.fr/fr/cnrsinfo/...
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Mathilde L. Tissier @mathildetissier.bsky.social · 23/04/2026
www.science.org/doi/10.1126/... Our letter in @science.org on the scientific consensus behind our conclusion: "legislation should prioritize and scale up sustainable practices & alternatives to pesticides, [...] and provide sustained support to farmers committed to agroecological transition."
science.org
France must protect pollinators over pesticides
Pollinating insects, which are essential to biodiversity, plant reproduction, and crop production, are in decline (1, 2). In Europe, pollinator populations have declined markedly over recent decades (...
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Mathilde L. Tissier @mathildetissier.bsky.social · 24/04/2026
18 chercheurs + consensus scientifique = 1 conclusion : la législation devrait donner la priorité aux pratiques durables & développer les alternatives aux pesticides, tout en apportant un soutien continu aux agriculteurs engagés dans la transition agroécologique #pollinisateurs #pesticides #Dumplomb
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