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

Videos

Environmental science 65%

Geography 16%

Posts Replies Media Videos

Reposted by Valentin Journé

The Tiny Bearrister @sherimander.bsky.social · 3d

The DNA pioneer is Rosalind Franklin.

Reposted by Matthew J. Silk, Valentin Journé

Dr. Emily G Simmonds @emilygsimmonds.bsky.social · 19d

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. "

Reposted by Ian Butler, Valentin Journé

Resist 🕎🍉 @antizionistjew.bsky.social · 20d

#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.

Valentin Journé @valentinjourne.bsky.social · 22d

Thanks to people that contributed to this huge database, and my collaborator's! The two I have found here @andrewhacket-pain.bsky.social , @micbog.bsky.social and of course those that are missing , D. Kelly, J. Foest, I. Oberklammer, M. Pesendorfer, A. Satake, K. Kondrat, J. Szymkowiak, I Pearse

Valentin Journé @valentinjourne.bsky.social · 22d

Of course this is the first step, more need to be done for example to understand how plants can perceive environmental cues. And this is what we are doing (:
For now, our study provides the first global synthesis of weather–reproduction relationships in perennial plants!

Valentin Journé @valentinjourne.bsky.social · 22d

This means that climate change will affect better reproduction ! Warmer conditions in temperate areas mean that reproductions might be more constant . Whereas in the tropics, if cold weather is too rare then we could expect more failure of reproduction! 🚦

Valentin Journé @valentinjourne.bsky.social · 22d

But temperature acts differently according to regions. Trees growing in boreal and temperate regions require warm summer and spring. Whereas in the tropics, plants need cold temperatures.

Valentin Journé @valentinjourne.bsky.social · 22d

Temperature is the main dominant driver related to seed production. Other matters , but to a lower extent

Valentin Journé @valentinjourne.bsky.social · 22d

🌳🌲So here is what we did, we look at important weather relationships to seed production using the largest open database , MASTREE+. We analysed more than 300 plant species, using moving windows analysis. And here is what we found:

Valentin Journé @valentinjourne.bsky.social · 22d

For example in European beech trees , we know that previous summer temperatures are super important and can trigger reproduction. But what about the other species ?

Valentin Journé @valentinjourne.bsky.social · 22d

In most perennial plants (like trees), we can observe years with heavy crops when many seeds will be produced. This phenomenon is called mast seeding or masting, and has huge implications ( food web, adaptation because without seeds no new generation etc). And it is related to weather

Reposted by Andrew Hacket‐Pain, Julen Astigarraga

Valentin Journé @valentinjourne.bsky.social · 22d

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...

Reposted by Ben Bond‐Lamberty, Antonio J. Pérez‐Luque, Darío Martin‐Benito , and 1 more Ben Bond‐Lamberty, Antonio J. Pérez‐Luque, Darío Martin‐Benito, Valentin Journé

Elisabet Martínez-Sancho @elimartinezs.bsky.social · Aug 21

🚨 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

Reposted by Rob Marchant, Francis Martin, Ben Bond‐Lamberty , and 9 more Rob Marchant, Francis Martin, Ben Bond‐Lamberty, Joshua B. Fisher, Benjamin I. Cook, Rosie A. Fisher, Tommaso Jucker, Pierre Mariotte, Valentin Journé, Simon Haberstroh, Alba Anadon‐Rosell, Elisabet Martínez‐Sancho

Charlotte Grossiord @charlottegrossiord.bsky.social · Aug 20

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

Reposted by Glenn H. Shepard, Tommaso Jucker, Andrew Hacket‐Pain , and 3 more Glenn H. Shepard, Tommaso Jucker, Andrew Hacket‐Pain, Darío Martin‐Benito, Valentin Journé, Álvaro Gaytán

Michal Bogdziewicz @micbog.bsky.social · Aug 19

🚨 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

Dr. Joan Dudney @dudney-joan.bsky.social · Aug 14

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

Reposted by Valentin Journé

Christophe Cassou @cassouman40.bsky.social · Jul 6

#A69
Des scientifiques alertent?
Les élus les ignorent.
Des opposants dans les arbres?
La police intervient.
L’illégalité reconnue par les tribunaux?
Les députés changent la loi.
Des casseurs sans lien avec l’A69 agressent les forces de l’ordre?
La faute aux manifestants.
La démocratie? Perdante.

Reposted by Valentin Journé

Methods in Ecology and Evolution @methodsinecoevol.bsky.social · Jun 19

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

Reposted by Monica G. Turner, Juan Rocha, Andrew Hacket‐Pain , and 2 more Monica G. Turner, Juan Rocha, Andrew Hacket‐Pain, Valentin Journé, Elisabet Martínez‐Sancho

WSL Umweltforschung @wslresearch.bsky.social · May 14

🌲🖥️ #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.

Reposted by Meelis Pärtel, Carlos P. Carmona, Nicolas Gross , and 6 more Meelis Pärtel, Carlos P. Carmona, Nicolas Gross, Julian Schrader, Valentin Journé, Rémy Beugnon, Stef Haesen, Jonathan von Oppen, Rubén Tarifa

Milan Chytrý @milanchytry.bsky.social · Apr 2

🌿 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.

Reposted by Ingolf Kühn, Meelis Pärtel, Julian Schrader , and 5 more Ingolf Kühn, Meelis Pärtel, Julian Schrader, Koenraad Van Meerbeek, Enrico Tordoni, Valentin Journé, Karl Andraczek, Rubén Tarifa

Carlos P Carmona @cpcarmona.bsky.social · Apr 2

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

Reposted by Valentin Journé

Rebecca Sear @rebeccasear.bsky.social · Apr 2

"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

Reposted by Valentin Journé

Trends in Ecology & Evolution @cp-trendsecolevo.bsky.social · Mar 3

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

Reposted by Belinda E. Medlyn, Michał Bogdziewicz, Valentin Journé , and 2 more Belinda E. Medlyn, Michał Bogdziewicz, Valentin Journé, Matthew M. Kling, Victor Van der Meersch

Rupert Seidl @rupertseidl.bsky.social · Feb 24

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

Reposted by Richard C. Chiverrell, Michał Bogdziewicz, Valentin Journé , and 1 more Richard C. Chiverrell, Michał Bogdziewicz, Valentin Journé, Pedro Mittelman

Proceedings of the National Academy of Sciences @pnas.org · Feb 11

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.

Valentin Journé @valentinjourne.bsky.social · Feb 7

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 🤯

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

Reposted by Valentin Journé

Michal Bogdziewicz @micbog.bsky.social · Feb 4

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/...

Reposted by Michał Bogdziewicz, Ferran Sayol, Guillermo Fandós , and 2 more Michał Bogdziewicz, Ferran Sayol, Guillermo Fandós, Valentin Journé, Hansraj Gautam

Dr Simon Goodman @phoca-sapiens.bsky.social · Jan 31

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

Reposted by Richard C. Chiverrell, Michał Bogdziewicz, Valentin Journé , and 3 more Richard C. Chiverrell, Michał Bogdziewicz, Valentin Journé, Freddie C. Draper, Brenton von Takach, Patrick D. Culbert

Andrew Hacket-Pain @andrewhacket-pain.bsky.social · Jan 29

Valentin Journé @valentinjourne.bsky.social · Jan 16

My point was some harassment issues by W. Jetz, not you or your work.

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