Valentin Journé
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valentinjourne.bsky.social
Valentin Journé
@valentinjourne.bsky.social
1.1K followers 400 following 15 posts
Functional ecology, forests, tree reproduction, species distribution

Assistant professor at Kyushu University

http://journevalentin.wixsite.com/forestecol
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Reposted by Valentin Journé
sherimander.bsky.social
The DNA pioneer is Rosalind Franklin.
November 7, 2025 at 9:15 PM
Reposted by Valentin Journé
elimartinezs.bsky.social
🚨 Check out our new study! 🌳🥶 Tree rings show that high-elevation beech forests are experiencing more spring frost damage in recent years
@newphyt.bsky.social @yannvit.bsky.social
#Phenology #Dendrochronology doi.org/10.1111/nph....
Emerging trend of increasing spring frost damage for beech at higher elevations in the Jura Mountains: evidence from tree‐ring data
Late spring frost (LSF) severely impacts tree growth and forest productivity, with global warming potentially altering LSF risk due to asymmetric changes in vegetation onset and frost timing. Howeve.....
doi.org
August 21, 2025 at 5:26 AM
Reposted by Valentin Journé
emilygsimmonds.bsky.social
PhD advert alert!

Come work with me at Edinburgh.

I'm advertising a PhD on: "Predicting responses of birds to climate change", competition funded through the E5 DTP. Would suit those with an interest in predicting responses to climate change, birds, or both.

e5-dtp.ed.ac.uk/project?item...
alt="Schematic of a graph of a population trajectory for blue tits that is known for half of the x-axis (time) and then forecasted with uncertainty. Above the population trajectory are some weather images (a sun and some rain) they have connections to the population size but the path is unknown. "
October 22, 2025 at 12:58 PM
Reposted by Valentin Journé
monachollet.bsky.social
À Rafah il y a deux jours : Israël continue de détruire des maisons palestiniennes bsky.app/profile/anti...
antizionistjew.bsky.social Resist 🕎🍉 @antizionistjew.bsky.social · Oct 21
#BREAKING | Even after the ceasefire, Israel keeps demolishing Palestinian homes across Gaza’s “red zone” an area that makes up almost half of the Strip.

New footage from Rafah yesterday shows Israeli forces detonating and flattening entire neighborhoods, undermining every claim of reconstruction.
October 22, 2025 at 7:16 AM
valentinjourne.bsky.social
Happy to share our last study published in @natcomms.nature.com

We asked

Can the weather tell trees when it’ is time to reproduce?

www.nature.com/articles/s41...
Picture of Japanese pine
October 20, 2025 at 4:34 AM
Reposted by Valentin Journé
charlottegrossiord.bsky.social
New PhD position in Plant Ecophysiology🌳 Study how atmospheric & soil drought shape tree carbon & water relations at the VPDrought experiment in Switzerland. Start Jan 2026. Apply here: m.refline.ch/273855/1759/... @wslresearch.bsky.social
August 20, 2025 at 12:38 PM
Reposted by Valentin Journé
dudney-joan.bsky.social
Really excited to share our new paper on #causalinference & #climatechange attribution out in #EcologyLetters today!

Are you asking "how much" or "if" climate change has impacted your system, then this paper is for you!

🧪🌏🌐🍁🌺🌱🌿
onlinelibrary.wiley.com/doi/10.1111/...
A Causal Inference Framework for Climate Change Attribution in Ecology
Accurately attributing ecological shifts to climate change remains a significant challenge. Here, we present an accessible causal inference framework designed for climate change attribution in observ...
onlinelibrary.wiley.com
August 14, 2025 at 1:58 PM
Reposted by Valentin Journé
micbog.bsky.social
🚨 Postdoc opening 🚨
Join us at Forest Biology Center (Poznań, Poland) to study forest ecology under climate change.

2-year contract (extendable), start Jan 2026 (flexible). Apply by Sept 30, 2025.

🔗 forestbiologycenter.amu.edu.pl/our-team/joi...
Forest Biology Center - Adam Mickiewicz University in Poznań, Poland
Centrum Biologii Lasu Uniwersytetu im. Adama Mickiewicza w Poznaniu
forestbiologycenter.amu.edu.pl
August 19, 2025 at 9:32 AM
Reposted by Valentin Journé
benecologie.bsky.social
Ce que les soc-dem appellent "casseurs" sont fort probablement des manifestant.e.s comme les autres qui protègent des violences de la police, qui s'attaquent aux symboles d'un capitalisme qui nous tue collectivement et mettent hors d'état de nuire des activités destructrices.
July 6, 2025 at 5:20 PM
Reposted by Valentin Journé
methodsinecoevol.bsky.social
Check out our latest blog post!!

Xiaojie Gao gives us the story behind their paper and the newly published pnetr R package, used for forest ecosystem modelling 🌳 Read the blog post here 👇

buff.ly/oKTtoJh
June 19, 2025 at 11:02 AM
Reposted by Valentin Journé
wslresearch.bsky.social
🌲🖥️ #PhDAlert! MSc in a #natural #science & experience with #tree-ring analysis and statistical software (R)? Fluent in English and ready for #fieldwork? Our #forest dynamics #research unit is looking for a #PhD candidate in #dendroecology and #ecophysiology! apply.refline.ch/273855/1736/...
PhD candidate in Dendroecology and Ecophysiology The project involves fieldwork, lab analyses and manipulative experiments. The research sites are located in the Alps (Switzerland), Pyrenees (Spain), and Carpathians (Romania), and the experimental study will be conducted in Switzerland. You will apply dendroecological techniques to measure and analyse carbon and oxygen isotope ratios in the cellulose of tree rings as proxies of physiological changes. Additionally, you will participate in an experimental study on saplings growing along an elevational transect in the Alps, examining their morphological, physiological, and phenological responses to climate stressors (heat, drought, and frost). Ultimately, the goal is to rank species by their sensitivity to recent and future climatic stressors, helping forest managers select the most resilient species for each elevation zone. You hold a Master’s degree in forest ecology, ecology, plant physiology, environmental science, or a related field. Ideally, you already have experience with tree-ring analysis, ecophysiology, or climate data analysis. You have a good command of English, enjoy working collaboratively, and are comfortable using statistical software, preferably R. You are in good physical condition so that you can move safely over rough terrain. In addition, you are independent, self-motivated, and eager to take on a challenging project that will contribute to a deeper understanding of how climate change affects forest ecosystems. This position offers an exciting opportunity for those seeking a career in dendroecology, ecophysiology, or climate change science. You will work in an international research environment with access to cutting-edge methods and collaboration opportunities in Spain and Romania. Working place will be at WSL in Birmensdorf (approx. 20 min outside of Zurich); PhD enrolment will be at University of Bern.
May 14, 2025 at 8:13 AM
Reposted by Valentin Journé
cpcarmona.bsky.social
Excited to announce our new paper, “Global impoverishment of natural vegetation revealed by dark diversity,” out today in Nature – and it’s open access! Huge global collaboration led by Meelis Pärtel 🌐@macroecologyut.bsky.social

www.nature.com/articles/s41...
Global impoverishment of natural vegetation revealed by dark diversity - Nature
A comparison of alpha diversity (number of plant species) and dark diversity (species that are currently absent from a site despite being ecologically suitable) demonstrates the negative effects of re...
www.nature.com
April 2, 2025 at 7:31 PM
Reposted by Valentin Journé
milanchytry.bsky.social
🌿 The first article of our DarkDivNet consortium, led by Meelis Pärtel, has been published in Nature. Our dataset from 5500 sites in 119 world regions, collected specially for this purpose, shows that plant diversity is negatively affected not only by direct human impact such as local disturbance.
April 2, 2025 at 7:48 PM
Reposted by Valentin Journé
rebeccasear.bsky.social
"from 1965 to 2020, nearly half the variation in publication trends among 293 North American male passerine & near-passerine birds was explained by 3 factors subject to human bias: aesthetic salience (visual appeal), range size (familiarity) & number of universities within ranges (accessibility)"
Six-decade research bias towards fancy and familiar bird species | Proceedings of the Royal Society B: Biological Sciences
Human implicit biases towards visually appealing and familiar stimuli are well documented and rooted in our brains’ reward systems. For example, humans are drawn to charismatic, familiar organisms, bu...
royalsocietypublishing.org
April 2, 2025 at 7:28 AM
Reposted by Valentin Journé
cp-trendsecolevo.bsky.social
Online now: Shifting, expanding, or contracting? Range movement consequences for biodiversity
Shifting, expanding, or contracting? Range movement consequences for biodiversity
Climate change is causing species ranges to shift, expand, and contract, with divergent and underappreciated consequences for local and global biodiversity. Widespread range shifts should increase local diversity in most areas but reduce it in the…
dlvr.it
March 3, 2025 at 12:56 PM
Reposted by Valentin Journé
pnas.org
Warmer summers are causing European beeches to produce seed more often, depleting the trees’ stored resources—an indirect effect of climate change that is threatening the sustainability of Europe’s most widespread forest tree. In PNAS: www.pnas.org/doi/10.1073/...
Branch of beech tree, Fagus sylvatica, with nuts and green leaves.
February 11, 2025 at 4:31 PM
Reposted by Valentin Journé
rupertseidl.bsky.social
Interesting work by van der Meersch et al. out in Ecology Letters, nicely illustrating that process-based models are more robust than correlative models for predicting species distributions under novel climatic conditions doi.org/10.1111/ele....
Paleorecords Reveal Biological Mechanisms Crucial for Reliable Species Range Shift Projections Amid Rapid Climate Change
Climate change has created an urgent need for reliable projections of species distributions. By hindcasting forest tree range shifts across Europe over the last 12,000 years, we show that process-exp...
doi.org
February 24, 2025 at 6:16 AM
Reposted by Valentin Journé
phoca-sapiens.bsky.social
Papers like this really underscore the importance of long term monitoring datasets for understanding climate change impacts on biodiversity... And highlight the dire consequences of even modest temperature increases. 🧪🌍🦤🦜

www.science.org/doi/10.1126/...
Climate change aggravates bird mortality in pristine tropical forests
Climate change threatens Amazon rainforest birds, with harsher dry seasons significantly affecting their survival over 27 years.
www.science.org
January 31, 2025 at 6:03 PM
Reposted by Valentin Journé
micbog.bsky.social
Our paper that showed alternations in masting patterns are leading to growth decline in European beech is now in @PNASNews, as a part of highlighted content; check out that summary! :)

Funded by @NCN_PL

www.pnas.org/doi/10.1073/...
February 4, 2025 at 5:25 PM
valentinjourne.bsky.social
Interested by tree growth, resources allocation and climate change? Have a look in our last study! We showed how tree reproduction is impacting tree growth,. AND... not only drought is responsible of a growth reduction 🤯
andrewhacket-pain.bsky.social Andrew Hacket-Pain @andrewhacket-pain.bsky.social · Jan 29
🌳🌳🌳 We have a new paper in @pnas.org showing climate warming leads to growth decline in beech because it drives trees to reproduce more frequently. Climate change can cause growth decline even when drought isn’t increasing by shifting where trees allocate resources doi.org/10.1073/pnas.2423181122
Coring a big beech tree
February 7, 2025 at 6:39 PM
Reposted by Valentin Journé
annebaranger.bsky.social
Really pleased to announce the publication of my PhD paper in @ecography.bsky.social ! We demonstrate the importance of physiological tolerance traits to frost and drought in understanding the distribution limits of 35 tree species in Europe.🧵
nsojournals.onlinelibrary.wiley.com/doi/10.1111/...
Living on the edge – physiological tolerance to frost and drought explains range limits of 35 European tree species
Species distribution models are key to evaluate how climate change threatens European forests and tree species distributions. However, current models struggle to integrate ecophysiological processes....
nsojournals.onlinelibrary.wiley.com
December 3, 2024 at 1:58 PM
Reposted by Valentin Journé
patrickweigelt.bsky.social
Phylogenetic turnover of seed plants 🌱 at a global 🌐 and across phylogenetic scales: www.nature.com/articles/s41...
Environmental filtering, not dispersal history, explains global patterns of phylogenetic turnover in seed plants at deep evolutionary timescales - Nature Ecology & Evolution
This modelling study integrates comprehensive regional plant inventories, environmental conditions and palaeogeographical reconstructions to assess the relative roles of environmental filtering and di...
www.nature.com
December 1, 2024 at 12:40 PM
Reposted by Valentin Journé
samillingworth.com
🌍📉 Climate change is driving mass extinctions

A new meta-analysis in @science.org spanning 30+ years shows 1.6% of ALL species are at risk at 1.3°C warming, rising to 29.7% at 5.4°C.

This is very very bad. When will we wake up?

🔗 www.science.org/doi/10.1126/...

🧪🍎 #ClimateCrisis #SciComm
Climate change extinctions
Climate change is expected to cause irreversible changes to biodiversity, but predicting those risks remains uncertain. I synthesized 485 studies and more than 5 million projections to produce a quant...
www.science.org
December 5, 2024 at 8:47 PM
Reposted by Valentin Journé
micbog.bsky.social
As we approach winter solstice, remember that European beech uses summer solstice to coordinate its masting events all across Europe!

Beech seeding is triggered by high summer temps, and all trees across the range measure that after 21st of June. MIND BOGGLING.
www.youtube.com/watch?v=_Rye...
Nature Plants: summer solstice and mast seeding
YouTube video by Michał Bogdziewicz
www.youtube.com
December 3, 2024 at 8:16 AM
Reposted by Valentin Journé
andrewhacket-pain.bsky.social
🚨 Funded PhD opportunity: forests & climate change
Drought reduces growth, triggers dieback & can kill trees, but how does it affect tree reproduction? Help us answer this question! Join a great team in Liverpool & Kew, inc. @belenfadrique.bsky.social 🌳🌱🌲 Deadline = Jan
Info: tinyurl.com/3z9z3ad6
Fagus sylavtica flowering
November 27, 2024 at 3:14 PM