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Trees ‘remember’ wetter times − never having known abundant rain could buffer today’s young forests against climate change
In a changing climate, trees exhibit “legacy effects” from past droughts or wet periods. Young trees, adapted to arid conditions, offer hope for future forest resilience amidst escalating climate challenges globally.
Alana Chin, Cal Poly Humboldt ; Janneke Hille Ris Lambers, Swiss Federal Institute of Technology Zurich, and Marcus Schaub, Swiss Federal Institute for Forest, Snow and Landscape Research (WSL)
What does the future hold for forests in a warmer, drier world? Over the past 25 years, trees have been dying due to effects of climate change around the world. In Africa, Asia, North America, South America and Europe, drought stress amplified by heat is killing trees that have survived for centuries.
Old trees may have grown through entire millennia that were wetter than the past 20 years. We are scientists who study forest dynamics, plant ecology and plant physiology. In a recent study, we found that trees can remember times when water was plentiful and that this memory continues to shape their growth for many years after wet phases end.
This research makes us optimistic that young trees of today, which have never known 20th-century rainfall, have not shaped their structure around water abundance and thus may be better equipped to survive in a chronically dry world.
What if we water the forest?
This study built on nearly 20 years of forest research in response to early warning signs of forest loss in the 1990s in the dry Rhône River Valley of the Swiss Alps. At that time, scientists observed that Scots pine trees that had stood for around 100 years were declining and dying. They wondered whether drought or other climate factors were driving this loss.
To tackle this question, researchers at the Swiss Federal Institute for Forest, Snow and Landscape Research designed an ecological experiment. To understand the impacts of drought, they would irrigate a mature forest, doubling natural summertime rainfall, and then compare how these water-rich trees fared in comparison with those receiving only natural precipitation.
The Pfynwald experiment, launched in 2003, has shown that trees survived at higher rates in irrigated plots. After 17 years of irrigation, the team found that irrigation didn’t just help trees survive dry phases – it also increased their growth rates. https://www.youtube.com/embed/OA7A-xWhDeo?wmode=transparent&start=0 Tree physiologist Leonie Schönbeck conducts research at Pfynwald, a natural reserve in southern Switzerland, to learn how trees take up and store energy and use their reserves to recover from drought.
Legacy effects are forests’ memories
Trees experiencing drought alter their leaves, wood and roots in ways that prime them for continued dry conditions. Wood under drought might have smaller cells that are less vulnerable to future damage, and roots might increase relative to leaf area. These structural changes persist after the drought has passed and continue to influence the tree’s growth and ability to tolerate stress for many years.
Known as “legacy effects,” these lingering post-drought impacts represent an ecological memory of past climatic conditions at the tree and forest level. Knowing that trees hold a persistent memory of past dry phases, researchers wondered whether they might also show structural changes in response to past wet periods.
Eleven years after summertime irrigation started in Pfynwald, scientists stopped irrigating half of each plot in 2013 to address this question. The formerly irrigated trees, which at this point were about 120 years old, had experienced a lasting period of irrigation – but now those times of plenty were over.
Would the trees remember? A decade later, we found out.
Trees, trains and particle accelerators
On an early March morning in 2023, two of us (Alana Chin and Marcus Schaub) met at Pfynwald to collect very fresh leaf and twig samples so that we and colleagues could look inside to search for signs of lasting effects of past water richness.
At the site, we climbed canopy access towers to collect newly grown treetop leaves and twigs from control trees that had never been irrigated; trees that had been irrigated every summer since 2003; and formerly irrigated trees that had not received irrigation water since 2013.
We took our samples to the Swiss Light Source, an intensely powerful synchrotron – a type of particle accelerator that produces the world’s most intense beams of light. This facility is the home of the TOMCAT, an extremely high-resolution X-ray that allowed us to look inside our leaves and twigs without disturbing their structure.
Scanning our samples took all night, but when we stumbled out of the building, we had images capturing every cell in exquisite detail.
The memory of water
We found that the new leaves of once-irrigated trees were different from both continually watered trees and never-watered control trees. Leaves carry out photosynthesis that fuels a tree’s survival and growth. Inside them, we could see the legacy of past water abundance, written in the size, shape and arrangement of cells.
Reading this cellular signature, we observed that, at the expense of structures promoting productivity, formerly irrigated trees showed every sign of chronic water stress – even more so than never-irrigated trees. In their anatomy, we saw why these trees that had it easy for 11 wet years were now growing slowly.
Every cell in a leaf comes with a trade-off. Trees must balance investments in rapid photosynthesis with others that promote leaf survival. Rather than building the cells used to harvest sunlight and ship sugar to the rest of the tree, leaves on the trees that had been irrigated showed every indication of drought stress we could think to measure.
After receiving extra water for an 11-year stretch and then losing it, the trees were producing new, tiny leaves that invested mostly in their own survival. The leaves were structured to protect themselves from insects and drought and to store water reserves. Compared with leaves on trees that had never known irrigation, these looked as though they were in the middle of the drought of the century.
While this memory of water might seem negative, it likely once helped trees “learn” from past conditions to survive in variable environments. The formerly irrigated trees did not know that humans had played a trick on them. Like trees experiencing climate change, they had no way of knowing that the water was not coming back.
When trees experience a drought event, recovery can mean reaching a “new normal” state, in which they are prepared to survive the next drought, with smaller, less vulnerable cells and increased energy reserves to ‘save up’ for future dry periods. They may have deeper roots or a smaller pool of leaves to support, helping them prepare for an unstable environment.
We wanted to know whether the same was true of trees that had experienced water abundance. Were they waiting in distress for the water to return?
Hard times may make tough trees
In some temperate forests, like the ones we studied in Switzerland, old trees once knew levels of water abundance that now are gone, thanks to climate change. That past abundance may have locked into place structural and epigenetic changes in the trees that are mismatched to today’s drier world. If this is true, then some of today’s devastating global tree mortality events may be, in part, due to the legacy effects of past water abundance.
In most of the world’s temperate forests, however, the current cohort of young forest trees – those sprouting in the past 15 to 20 years – has managed to establish itself under conditions that once would have been considered chronic drought. Those young trees, which have survived an endless dry period, will form the forests of the future.
In all, our observations in Pfynwald have provided us some room for hope that young trees currently taking their place in many forests worldwide may be better prepared to cope with the world as humans have shaped it. Climate shifts in recent decades have primed them for hard times, without the lingering memory of water.
Alana Chin, Assistant Professor of Plant Physiology, Cal Poly Humboldt ; Janneke Hille Ris Lambers, Professor of Environmental Systems Science, Swiss Federal Institute of Technology Zurich, and Marcus Schaub, Group Leader, Forest Dynamics and Ecophysiology, Swiss Federal Institute for Forest, Snow and Landscape Research (WSL)
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Valley Metro to Exit CAPEX Capitol Extension After Phoenix Council Shifts Focus to Indian School Road Corridor
Valley Metro is shifting its focus on high-capacity transit planning in west Phoenix following a City Council vote, prioritizing a new corridor along Indian School Road while exiting the Capitol Extension project, CAPEX, and seeking community engagement.
Last Updated on March 6, 2026 by Daily News Staff
Valley Metro is officially shifting gears on high-capacity transit planning in west Phoenix following a Phoenix City Council vote earlier this year.
In a message to the public, Valley Metro said that after the Jan. 27, 2026 City Council decision to re-evaluate high-capacity transit options and prioritize a proposed West Phoenix corridor along Indian School Road, the agency will exit project development and the Federal Transit Administration Capital Investment Grant (CIG) process for the Capitol Extension (CAPEX) project.
What the City Council voted to do
According to Valley Metro, the Phoenix City Council voted to take another look at high-capacity transit options for west Phoenix and to prioritize studying a new corridor alignment along Indian School Road.
What Valley Metro is doing next
Valley Metro emphasized it still supports expanding high-capacity transit in west Phoenix, citing demand and mobility needs in the corridor. But the agency says it will now pivot away from CAPEX and toward the new study effort.
Key next steps Valley Metro outlined include:
- Exiting the CAPEX project development process and the federal CIG pipeline
- Advancing planning for the West Phoenix study along Indian School Road
- Centering comprehensive community engagement, including outreach to residents, business owners, and stakeholders along the corridor
- Working closely with the City of Phoenix on project development
- Coordinating with the Federal Transit Administration to explore funding opportunities
How to stay engaged
Valley Metro is encouraging residents to sign up for updates as the next phase moves forward at valleymetro.org/notices.
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After the Blood Moon: Scientists and Skywatchers React to the March 3, 2026 Total Lunar Eclipse
The March 3, 2026 total lunar eclipse amazed skywatchers worldwide. Scientists and amateur astronomers share reactions and photos from the dramatic blood moon event.
Last Updated on March 5, 2026 by Daily News Staff
Millions of people around the world looked to the sky in the early hours of March 3, 2026 to witness one of the most striking astronomical events of the year — a total lunar eclipse, often referred to as a “Blood Moon.” As the Moon passed completely into Earth’s shadow, it transformed from its familiar silver glow into a deep copper-red color, captivating observers from North America to Asia and across the Pacific.
Blood Moon Aftermath: Scientists and Skywatchers React to the March 3, 2026 Total Lunar Eclipse
For viewers in the western United States, including Arizona and California, the eclipse occurred just before sunrise. The timing created a dramatic scene as the reddish Moon hovered low in the western sky while the eastern horizon began to brighten with dawn.
A Global Skywatching Event
Total lunar eclipses occur when the Sun, Earth, and Moon align so that Earth’s shadow completely covers the Moon. During the March 3 event, the Moon spent nearly an hour fully inside the darkest part of Earth’s shadow, known as the umbra. During this phase, sunlight filtered through Earth’s atmosphere projected reddish light onto the Moon’s surface, creating the dramatic “blood moon” effect.
Astronomers noted that the event was particularly significant because total lunar eclipses are relatively infrequent. While partial eclipses occur more often, a full eclipse visible across large portions of the globe remains a memorable experience for both scientists and casual observers.
Scientists Explain the Phenomenon
According to researchers at NASA, the reddish color seen during totality occurs because Earth’s atmosphere scatters shorter wavelengths of sunlight — such as blue — while allowing longer red wavelengths to pass through. This filtered light is then bent, or refracted, into Earth’s shadow and projected onto the Moon.
Planetary scientists say lunar eclipses provide a powerful visual demonstration of the geometry of the Earth–Moon–Sun system. The curved shadow moving across the Moon also historically served as one of the earliest pieces of evidence that Earth is spherical.
Researchers also point out that lunar eclipses offer opportunities to study Earth’s atmosphere. Variations in dust, volcanic particles, and atmospheric conditions can influence how dark or red the Moon appears during totality.
Amateur Astronomers Share Their Views
While professional observatories monitored the eclipse with precision instruments, amateur astronomers and astrophotographers helped document the event from countless locations worldwide. Social media platforms and astronomy forums quickly filled with images showing the Moon’s color shifting from pale gray to orange and deep red.
Many skywatchers in the southwestern United States described the experience as particularly dramatic because the eclipse occurred just before moonset. Observers reported seeing the Moon glowing red above desert landscapes and city skylines before gradually fading into the brightening morning sky.
Astrophotographers also emphasized that lunar eclipses are among the easiest astronomical events to capture. Unlike solar eclipses, they can be photographed safely without special filters, making them accessible to beginners using smartphones as well as professionals using telescopes and high-end cameras.
A Rare Pre-Dawn Sight
In parts of the western United States, some observers were able to witness a rare atmospheric phenomenon known as a selenelion, when both the eclipsed Moon and the rising Sun appear in the sky at the same time due to atmospheric refraction. The effect added an unusual visual element to an already impressive celestial event.
The combination of a deep red Moon and the approaching dawn created striking photographic opportunities and memorable moments for early-morning skywatchers.
When Is the Next Total Lunar Eclipse?
Although partial eclipses occur periodically, the next widely visible total lunar eclipse will not occur until late 2028. That makes the March 2026 eclipse one of the most notable skywatching events of the decade.
For many observers, the event served as a reminder that some of the most spectacular astronomical experiences require nothing more than stepping outside, looking up, and taking a moment to appreciate the universe above.
References and Further Reading
- NASA – Lunar Eclipse Science Overview
- Time and Date – March 3, 2026 Total Lunar Eclipse Details
- Sky & Telescope – Astronomy News and Observing Guides
- Space.com – Guide to Lunar Eclipses
- STM Daily News – Science Coverage
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Arizona Scholarships 2026: $1,500 Awards + Free ACF Virtual Workshops
Arizona scholarships 2026: Arizona scholarships are open through ACF: one application for 160+ awards, plus ARAC’s $1,500 Ashby-Herring scholarships due April 6, 2026.
Last Updated on March 5, 2026 by Daily News Staff
Arizona Scholarships 2026: $1,500 Awards + Free ACF Virtual Workshops
Scholarship season moves fast, and for a lot of Arizona families, the hardest part isn’t writing the essay or gathering transcripts—it’s simply finding the right opportunities in time.
The Archer Ragsdale Arizona Chapter (ARAC), Tuskegee Airmen, Inc. is encouraging students and the community to take advantage of scholarship resources through the Arizona Community Foundation (ACF), including an easy online application that can match applicants with 160+ scholarships—plus virtual workshops where students can get help directly from ACF’s scholarship team.
Whether you’re a high school senior, a current college student, or an adult re-entry student, ACF’s scholarship portal is designed to meet people where they are.
The Big Picture: One Application, 160+ Scholarships
According to the flyer, ACF awarded $6.3 million in scholarships last year, with over 160 scholarships available through a single, easy application.
- Application opens: January 1
- Most deadlines: March and April
- Where to start: https://azfoundation.org/scholarships
- ACF scholarship email: scholarship@azfoundation.org
What to watch for: Even if a student is only targeting one scholarship, completing the ACF application can surface additional matches they didn’t know existed.
ARAC Tuskegee Airmen Scholarship: Ashby-Herring Scholarships ($1,500) — Deadline April 6, 2026
ARAC (Tuskegee Airmen, Inc.) awards two or more scholarships to deserving Arizona students who are college-bound. The flyer highlights the Ashby-Herring scholarships, named in honor of late founding ARAC members who were original Tuskegee Airmen.
Award: Two Ashby-Herring scholarships (each $1,500)
Deadline:April 6, 2026
Apply here:https://www.azfoundation.org/archer-ragsdale
Eligibility:
- Graduating high school senior from Arizona
- Attending a 2-year or 4-year college/university
- African-American
- 3.0 GPA or higher
- Demonstrated financial need
Free Virtual Workshops (Zoom): Get Help With Your Application
If you’ve ever watched a student stall out halfway through an application, these workshops are a smart fix: they’re designed so applicants can work on their scholarship application with support from ACF’s scholarship team.
Workshop dates (Zoom):
- February 12, 2026 — 4:00 to 5:00 p.m.
- March 5, 2026 — 4:00 to 5:00 p.m.
- March 26 — 4:00 to 5:00 p.m. (date listed on flyer; confirm year when registering)
Register here:https://acf.cventevents.com/acfscholarships2026
View the flyer here: https://stmdailynews.com/wp-content/uploads/2026/03/Deadline-updated-12.29.2025-Archer-Ragsdale-Flyer-FINAL.pdf
Download Flyer (PDF)
What to watch for: Register for the dates you can attend and come prepared with what you already have (basic info, activities list, questions). One hour of guided progress can save days of procrastination.
Why This Matters (and Why Sharing Helps)
The Tuskegee Airmen legacy is rooted in excellence, discipline, and breaking barriers—and scholarships tied to that legacy are meant to elevate futures for the next generation.
If you’re a parent, teacher, coach, mentor, or neighbor, consider this your nudge: forward the link, post it in a group chat, or share it with a student who might qualify. Deadlines hit quickly, and the easiest scholarship to win is often the one you actually apply for.
View the press release: https://stmdailynews.com/wp-content/uploads/2026/03/FOR-IMMEDIATE-RELEASE.pdf
Related Links:
- https://azfoundation.org/scholarships
- https://acf.cventevents.com/acfscholarships2026
- https://www.azfoundation.org/archer-ragsdale
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College isn’t just classes and credits — it’s learning how to manage your time, money, health, and relationships while you build a future that actually fits. In our College Life coverage, STM Daily News shares practical, real-world guides for students and families: campus living tips, study and productivity habits, career prep, budgeting basics, mental wellness check-ins, and smart ways to make the most of college in Arizona and beyond.
Expect quick reads, useful takeaways, and “what to do next” advice — whether you’re a first-year student, a transfer, or heading back to school.
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