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Posts by Jorge A. Giraldo

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What if we could track forest growth faster than plots?
Check out our new work! #TreeRings #Dendrochronology
doi.org/10.1016/j.de...

1 week ago 4 2 0 0
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Tropical Alder (Alnus acuminata) tree rings.

1 month ago 6 1 0 0
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Oxygen Isotopes in Tree Rings Track Neotropical Climate Dynamics Tree-ring δ18O from Abies guatemalensis in Central America captures interannual variations in boreal summer rainfall Lighter δ18O years are associated with a weakening of the Caribbean Low-Level ...

Excited to have this paper out showing a strong coupling between Central American tree-ring oxygen isotopes and ocean–atmosphere dynamics (interbasin SST gradients, ITCZ, CLLJ... ). Many thanks to all co-authors!

agupubs.onlinelibrary.wiley.com/doi/10.1029/...

2 months ago 35 18 1 0
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Conduit and pit dimensions scale in a coordinated way from the treetop to coarse roots in three boreal tree species Abstract. Xylem conduits widen with distance from the treetop (dtreetop), counteracting most of the resistance to water transport which accumulates with tr

Our paper is out 🎉🌲🌳
Conduit and pit dimensions scale in a coordinated way from the treetop to coarse roots in three boreal tree species. academic.oup.com/treephys/art...

2 months ago 7 2 0 1
Dendrochronology Intensive Summer Course (DISC) 2026 | Laboratory of Tree-Ring Research

Join the Laboratory of Tree-Ring Research at the University of Arizona for our 2026 Dendrochronology Intensive Summer Course (DISC)! Spend 3 great weeks (May 18th to June 5, 2026) in the field, lab, and classroom learning first-hand how tree-ring research is done! ltrr.arizona.edu/summerschool

4 months ago 28 18 1 0
Job offer: The Swiss Federal Institute for Forest, Snow and Landscape Research WSL is part of the ETH Domain. Approximately 600 people work on the sustainable use and protection of the environment and on the handling of natural hazards.

The Forest and Soil Ecology research unit, which investigates the effects of environmental changes in forest ecosystems, is looking for a person to join the Ecosystem Ecology group for a fixed-term period of four years, starting January 2026 or by appointment, as a
PhD student in plant phenology and ecophysiology
You will be responsible for planning and carrying out experiments in the field and under controlled conditions in the SNF funded project “Linking carbon source-sink dynamics to autumn phenology: Predicting tree growth rhythms in temperature and boreal forests”. You will analyse the interaction between carbon balance and phenology by applying various ecophysiological and biochemical methods and large-scale data analyses. You will carry out statistical and mechanistic modelling approaches. Finally, you will be responsible for publishing results in scientific journals.
You have a master’s degree in environmental science, or a comparable topic and are interested in applying various methods, from ecophysiology to model applications. You have a proficient command of written and spoken English, are able to work in a structured, efficient and independent manner, and have a high level of team spirit. Furthermore, you have a good level of fitness to carry out field work in remote locations. We offer an international team with exciting research perspectives and strong collaboration with researchers from ETH and international institutions. The position will be based at WSL and you will be enrolled at ETH Zurich.

Job offer: The Swiss Federal Institute for Forest, Snow and Landscape Research WSL is part of the ETH Domain. Approximately 600 people work on the sustainable use and protection of the environment and on the handling of natural hazards. The Forest and Soil Ecology research unit, which investigates the effects of environmental changes in forest ecosystems, is looking for a person to join the Ecosystem Ecology group for a fixed-term period of four years, starting January 2026 or by appointment, as a PhD student in plant phenology and ecophysiology You will be responsible for planning and carrying out experiments in the field and under controlled conditions in the SNF funded project “Linking carbon source-sink dynamics to autumn phenology: Predicting tree growth rhythms in temperature and boreal forests”. You will analyse the interaction between carbon balance and phenology by applying various ecophysiological and biochemical methods and large-scale data analyses. You will carry out statistical and mechanistic modelling approaches. Finally, you will be responsible for publishing results in scientific journals. You have a master’s degree in environmental science, or a comparable topic and are interested in applying various methods, from ecophysiology to model applications. You have a proficient command of written and spoken English, are able to work in a structured, efficient and independent manner, and have a high level of team spirit. Furthermore, you have a good level of fitness to carry out field work in remote locations. We offer an international team with exciting research perspectives and strong collaboration with researchers from ETH and international institutions. The position will be based at WSL and you will be enrolled at ETH Zurich.

🍂🌳 #PhDAlert! MSc in #EnvironmentalSciences or a related field and interested in plant #phenology and #ecophysiology? Good level of fitness to carry out field work in remote locations? Our #Ecosystem #Ecology group offers a #PhD position: apply.refline.ch/273855/1789/... #ScienceJobs

6 months ago 8 7 0 1
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🪵 Diameter drives short-term biomass gains, but long-term carbon storage hinges on wood density, especially in humid forests. To improve accuracy, biomass models should account for radial wood density variation and climate ☁️

🔎 Find out more: buff.ly/kZFoh9B

6 months ago 18 5 0 0
Macroscopic features: A) Cassipourea guianensis (aceitillo);  B) Qualea  lineata(pomo);  C) Goupia  glabra (chaquiro). Arrows indicate tree rings.

Macroscopic features: A) Cassipourea guianensis (aceitillo); B) Qualea lineata(pomo); C) Goupia glabra (chaquiro). Arrows indicate tree rings.

New undergraduate research explores the anatomy of three native tree species from Colombia’s Chocó biogeographic region.
revistas.humboldt.org.co/index.php/bi...

6 months ago 9 1 0 0
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Transverse section of Weinmannia pubescens.

7 months ago 4 0 0 0
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Biomass production of tropical trees across space and time: The shifting roles of diameter growth and wood density Diameter growth is an important and good indicator of forest carbon production. However, size-related changes in wood density, which are usually neglected, are critical for accurate short- and long-t...

#Tree stems accumulate biomass by adding volume of certain density. Which factor is more important?

Using tropical #treering data we found: diameter increment explains biomass growth at short term; wood density at long term.🌎🌐🍁
#dendrochronology
besjournals.onlinelibrary.wiley.com/doi/10.1111/...

7 months ago 28 13 0 0

Have you seen our collection of high-impact articles?

Take a look at the most read and cited papers of the last two years at Forestry with topics ranging from:

🌳 Forest monitoring
💻 Deep learning
🍂 Ash dieback and more!

academic.oup.com/forestry/pag...

7 months ago 6 2 0 2
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🚀 New Feature in Leafmap – Interactive Time-Series Visualization! 🌍🛰️

Leafmap now supports time sliders for visualizing large collections of remote sensing images.

Try it out
Web App: huggingface.co/spaces/giswq...
Notebook: leafmap.org/maplibre/tim...

#geospatial #leafmap #opensource #mapping

8 months ago 20 6 0 0
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Pantropical tree rings show small effects of drought on stem growth Increasing drought pressure under anthropogenic climate change may jeopardize the potential of tropical forests to capture carbon in woody biomass and act as a long-term carbon dioxide sink. To evalua...

How do tropical #trees deal with droughts? The answer is published today in @science.org

Our pantropical #treering analysis revealed 2.5% growth reduction during #drought years. Yet, growth declined by >10% in 1/4 of 500 study sites, and in hotter & drier regions.

doi.org/10.1126/scie...
🌍🍁🌐
(1/4)

8 months ago 80 39 1 3

Nuestra propuesta para crear la Red Iberoamericana de Adaptación al cambio global de Bosques Amenazados - RIABA 🌎🌍 ha obtenido financiación del programa Lincglobal del @csic.es 1/2

9 months ago 2 1 1 0
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The seasonality of the Amazon water cycle is intensifying.
-> Bruno Cintra and colleagues use decades of oxygen isotopes in tree rings to show how the dry season has got drier, and the wet season wetter.

www.nature.com/articles/s43...

10 months ago 11 7 0 0
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New paper on tropical #timber #tracing! We tested the use of wood oxygen stable isotopes (δ18O ) for tracing. We produced #isoscapes for 5 major tropical timbers. These isoscapes alone had limited utility. Combinations with other techniques may help. #timtrace
www.sciencedirect.com/science/arti...

10 months ago 12 6 0 0
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Scaling plant responses to heat: From molecules to the biosphere Predicting plant responses to rising temperatures, including acute heat waves and hot droughts of varying intensity and duration, is central to addressing the climate and biodiversity crises. However,...

New in @sciencemagazine, a review on Scaling plant responses to heat (www.science.org/doi/10.1126/...). Increased temperature along with acute heat waves threaten the ability of terrestrial vegetation to act as a carbon sink, but predicting how plants will respond to heat is challenging.

10 months ago 76 30 4 0
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🪧Calling all researchers working with #dendrometers. The #NordicDendroNetwork is holding its first meeting 13-15 October in Norway. For more information and registration go to >>> shorturl.at/HqoFY

10 months ago 8 3 0 2
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PlotToSat :)
PlotToSat :) YouTube video by Milto Miltiadou

This tutorial will guide you through the core functionalities of PlotToSat. It will help you quickly extract Sentinel-1 🛰️ and Sentinel-2 🛰️ time series at multiple plot regions. The centres of the plots are defined in an input .csv file.
#EO #ML #time-series #forests 🌲
@drmiltiadou.bsky.social

10 months ago 9 6 0 0
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.

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.

🌲🖥️ #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/...

11 months ago 26 27 0 2
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Please share. We are hiring domestic/international #PhD students to work on citizen science, insect migration/conservation at Monash University in Melbourne, Australia. If interested, please email me. You can find more about our research interests here. shawanchowdhury.com.

11 months ago 67 57 2 5
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Adriana Corrales: Plants Are Not Alone Botany One interviews Dr Adriana Corrales, a researcher fascinated with the intricate relationships between plants and fungi.

In my latest interview for @botany.one, @adricorrales.bsky.social reminds us that plants are not alone; they thrive in association with many other organisms such as fungi and bacteria. #SciComm #PlantScience #Botany 🧪🍄 botany.one/2025/04/adri...

1 year ago 39 14 0 0
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🌳Urban trees keep cooling - even during record-breaking heatwaves! We show that trees maintained high transpiration, defying model predictions. Tree cooling during heat may be underestimated 🌡️💦
Great study led by Christoph Bachofen @wslresearch.bsky.social doi.org/10.1016/j.uf...

1 year ago 111 23 1 0
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Challenges and Opportunities in Tropical Dendrochronology for Climate Reconstructions Dendrochronology is applicable in the tropics Several tree species exhibit annual tree rings across diverse environmental conditions The challenge in tropical dendrochronology is to create tree-...

Nice commentary and perspective titled 'Challenges and Opportunities in Tropical Dendrochronology for Climate Reconstructions' by Jorge Giraldo et al. on the recent neotropical tree ring paper by @anaigmendez.bsky.social agupubs.onlinelibrary.wiley.com/doi/full/10....

1 year ago 7 1 0 0
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GitHub - RonaldVisser/Download_ITRDB Contribute to RonaldVisser/Download_ITRDB development by creating an account on GitHub.

I have written a small R-script to download all tree-ring data from the ITRDB (measurements and chronologies). Anyone can create a local copy, just in case the data might not be available anymore from @noaa.gov

github.com/RonaldVisser...

#dendrochronology #treering #opendata #share

1 year ago 52 20 1 1
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Most animals have their own version of tree rings – here’s how we biologists use them to help species thrive From whale earwax to bird feathers, almost all organisms keep a record of their existence.

Many living have their own "tree rings", including fish; the magnificient otolith! Learn more about this fantastic structure in this @theconversation.com article, written by our dear @otolithgirl.bsky.social #otolith #fish #treering #dendrochronology theconversation.com/most-animals...

1 year ago 12 3 0 1
Close up picture of well defined tree rings of a subfossil larch trunk found in glacial sediments at the Great Aletsch Glacier. 
A well visible compression wood area can be observed around ring n°9, which means the tree had some issues to maintain apical growth during that year due to some disturbance (avalanche, landslide, etc...?)

Close up picture of well defined tree rings of a subfossil larch trunk found in glacial sediments at the Great Aletsch Glacier. A well visible compression wood area can be observed around ring n°9, which means the tree had some issues to maintain apical growth during that year due to some disturbance (avalanche, landslide, etc...?)

🌲 Sample of the day! 🌲

A late-Holocene subfossil larch from Aletsch Glacier, fresh from the sanding machine! 🥰

Can't wait to measure and date it! 💍⌛

#TreeRing #Dendrochronology #Art

1 year ago 68 7 4 0
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Beautiful wood and tree rings of Albizia guachapele. #TreeRingTuesday #dendro #dendrochronology #TreeRings

1 year ago 7 1 0 0
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Productive day in the field with great sampling and data collection! #dendrometers #TreeRings

1 year ago 5 0 0 0

🌍 PhD student wanted in AI for Climate Extremes 🌿

Heatwaves, droughts, and heavy rain are intensifying—threatening vegetation, forestry, and agriculture. Join us to develop weakly supervised ML to detect and explain climate impacts in satellite data.

1 year ago 7 1 1 0