Approximately 90% of the U.S. population . A significant portion of the water supplying those systems comes from forested lands, which means that policies impacting forests also impact our water access.

In 2001, the Clinton administration passed the , blocking 60 million acres of national forest land from development to limit industrial timber harvest and preserve forest ecosystems. Although popular with the public, the roadless rule drew immediate criticism from timber and related industries. Last summer, the federal government announced plans to rescind it.

A new study from the 天美影视传媒 and Conservation Science Partners, , highlights the potential consequences of losing those protections by mapping how the roadless rule protects rivers.

鈥淭he roadless rule supports the drinking water supply for 25 million Americans and offers critical protection of wildlife habitat and recreational assets. In short, rivers in roadless areas are essential for both people and nature,鈥� said lead author , a UW professor of aquatic and fishery science.

To show how forests impact freshwater, the researchers looked at nearly 110,000 square miles of national forest representing 2,488 officially designated 鈥渞oadless areas.鈥� They cross-referenced the roadless areas map with a recent study assessing river protections nationwide to see where rivers and roadless areas overlap, and therefore which rivers were vulnerable to losing protection.

The researchers found that more than 80,000 miles of rivers in the continental U.S. receive some protection from the roadless rule. Of those protected segments, nearly 62,000 miles of river are protected by only the roadless rule. That water reaches 25 million people across the country, often at downstream distances far from roadless areas.

Research shows that forested lands provide higher quality water because soil microbes and plant roots filter contaminants before water arrives at treatment facilities. Cleaner water requires less processing, reducing potential treatment costs for public utilities. Some water utilities are investing in watershed protection as a way to save money and limit chemical use as demand for water rises.

鈥淔orest cover is well recognized for generating economic benefits by avoiding the large capital costs of water treatment plants needed to ensure clean, safe drinking water for people,鈥� said Olden.

Roadless areas are also vital strongholds for sensitive aquatic species, Olden added. At-risk species such as the use protected habitat for spawning and raising young. Hunters and anglers also value roadless areas because they support such productive fish and wildlife habitat and offer unparalleled opportunities for outdoor recreation.

After the U.S. Agriculture Secretary Brooke Rollins announced the plan to rescind the roadless rule last year, more than half a million people submitted comments during the public comment period, which ended in September. According to the Center for Western Priorities, more than expressed opposition to the plan.

Earlier this year, Republican lawmakers attempted to by attaching it to the Wildfire Prevention Act, which supports prescribed burns and forest thinning to fight megafires. Their to justify clawing back protections claimed that rescinding the roadless rule would allow for better forest management, but . Research shows that roadbuilding in formerly roadless areas is more likely to increase fire risk.

鈥淭o be clear, the rule does not block any management action that supports forest health, wildfire mitigation or recreation,鈥� Olden said. 鈥淚n fact, energy projects, transmission lines and mining development remain permitted within roadless areas.鈥�

Roadbuilding and logging can cause sediment build up in lakes and rivers, which must be filtered out. Chemicals from construction can also end up in the water supply. Reductions in forest cover resulting from rescinding the roadless rule may compromise water quality in the U.S., among other negative consequences for animals and ecosystems.

The U.S. Forest Service says it is reviewing public comments and a proposed rule and draft statement of environmental impact this year.

鈥淎ny decision to rescind or downgrade the roadless rule that may put forested lands at risk requires careful consideration of the numerous benefits they offer to people and nature,鈥� said Olden. 鈥淥ur study offers data to inform such decisions.鈥�

This study was funded by the 天美影视传媒 and from a contract from American Rivers to Conservation Science Partners.

For more information, contact Olden at olden@uw.edu.

New images of cigar-shaped M82 galaxy capture millions of stars

The Messier 82 galaxy, known as M82 or the Cigar galaxy, has long fascinated researchers with its astronomical rate of star formation 鈥� approximately 10 times faster than the Milky Way. Researchers have pored over grainy, low-resolution, images taken by previous generations of telescopes, which weren鈥檛 powerful enough to see through the thick cloud of dust surrounding the galaxy. The , however, can pierce straight through with extremely sharp vision. That enabled a team of astronomers from multiple institutions, including NASA and the UW, to capture new high-resolution images. Posted June 23, the images include more than 16.5 million individual stars and provide the clearest look yet at M82鈥檚 , the flattened central hub that contains most of the galaxy鈥檚 stellar mass. That could help scientists understand how M82 formed and for how long it has been producing stars so prodigiously.

For more information, contact team member a UW research professor of astronomy, at benw1@uw.edu.

All images are included in NASA鈥檚

New study maps pollution disparities by state and sector across almost 20 years

Air quality in the United States has improved markedly since the landmark Clean Air Act passed in 1970. However, the gains have not been equally shared: Today, communities of color and low-income communities are exposed to disproportionately more air pollution than the overall population. In in Science Advances, UW researchers created the first comprehensive map cataloging how air quality inequity has changed per state and economic sector from 2002 to 2019. The study confirmed that, despite improvements in overall air quality, pollution tends to be concentrated in Black, Hispanic and low-income communities. The findings include specific state-level opportunities for improvement across 11 sectors 鈥� for example, disparities in construction-related emissions in Florida increased significantly during the study period. The findings and resulting database could help policymakers across the country prioritize environmental justice projects.

For more information, contact senior author , UW professor of civil and environmental engineering at jdmarsh@uw.edu.

The other UW co-authors are , , and . A full list of co-authors is .听

Researchers observe ultrafast chemistry happening in real time

Molecules are not static. Instead, they are having little dance parties 鈥� their atoms wiggle and twist around in space. Occasionally, upon receiving a burst of energy, the bonds holding atoms together in a molecule can break and reform with the atoms in a different configuration. While the number of atoms stays the same, the orientation of these atoms determines a molecule’s chemical properties 鈥� an important part of its identity. In , a UW-led team witnessed firsthand, and for the first time, a molecule turning into its “alter ego.” The researchers observed a hydrogen atom, also known as a proton, jump to a new position by bonding to a different atom in the same molecule. This process, which happens within a few millionths of billionths of a second, is important for various fundamental processes, including photosynthesis, and when DNA acquires mutations. To understand why, and how, this happens so fast, the researchers developed a new tool that probes molecular structure on an ultrafast timescale. They were able to use this technology to detect how the molecule’s wiggles allowed the proton transfer to happen. These findings will help researchers test existing theories about these ultrafast chemical dynamics and develop new molecules for clean energy processes.

For more information, contact senior author , UW professor of chemistry, at mkhalil@uw.edu.听听听

Co-authors , and completed this work while at the UW. Funding information is .

Random events leave lasting signature on the atmospheric methane record, new study shows

Methane is a powerful greenhouse gas with a complicated life cycle. It鈥檚 released into the atmosphere by both natural and industrial processes, and there are multiple pathways by which it鈥檚 broken down. Recently, atmospheric methane levels have reached record highs but the rate of accumulation has been somewhat inconsistent over time. To understand why, researchers are looking at climate records preceding the industrial era, via ice cores. These deep cylinders of glacial ice document slow swings in atmospheric methane levels spanning decades, or even centuries. This pattern is typically associated with gradual climate change, but in , UW researchers show that it doesn鈥檛 have to be. Instead, they reveal that short-term, random events, such as fires or changes in wetlands, can spark gradual shifts. Not only does this clarify the historical record, but it also adds nuance to modern trends.

For more information, contact senior author , UW doctoral student of atmospheric and climate science at emei@uw.edu.

The other UW co-authors are and . A full list of co-authors is .

Data spanning nearly half a century shows that endangered southern resident killer whales are spending less time in inland waters, whereas their larger cousins, Bigg鈥檚 killer whales, are increasingly present in Puget Sound.

The National Oceanic and Atmospheric Administration southern resident killer whales as endangered in 2005 after rapid population decline in the late 1990s. Now, , split into three pods: J, K and L. Bigg鈥檚 鈥� sometimes referred to as transients 鈥� are more common, but difficult to count because they travel in smaller groups over wider ranges.

Looking at data from 鈥檚 Sightings Archive between 1978 and 2022, 天美影视传媒 researchers modeled migratory trends based on observations from researchers, recreational boaters and whale watchers. They found that K and L pods are visiting Puget Sound less often, but the J pod remains well represented. The data on Bigg鈥檚 corroborates recent results showing a steady increase in inland waters.

The results in PLOS One.

鈥淲e do see increasing transient presence over time, but we don鈥檛 see a definitive decline or overall increase for the southern residents. Their presence here is much more variable,鈥� said lead author , a UW postdoctoral researcher of marine and environmental affairs.

Key behavioral and subtle physical differences . The southern residents eat salmon, while Bigg鈥檚 prey on seals, porpoises and other marine mammals. Seals and sea lions rebounded in Washington after the Mammal Protection Act, which may have drawn Bigg鈥檚 killer whales to inland waters, but that doesn鈥檛 explain the changing distribution of southern residents.

Because southern residents are organized into tight matriarchal societies led by female elders, researchers believe that social cues may play an important role.

鈥淒oes J pod know something that K and L don鈥檛? Or vice versa? We like to think about which pods have really old grandmas left and who’s teaching them where to go,鈥� said co-author , a marine mammal specialist at the National Oceanic and Atmospheric Administration (NOAA), West Coast Regional office.

Policies to protect southern residents typically apply to all pods. With K and L spending more time in coastal waters, NOAA for southern residents in 2021 to include 16,000 square miles of marine waters between the U.S. and Canada border and Point Sur, California.

Measures like the , which encourages commercial ships to slow down where whales are present, aim to mitigate the impact of noise. Boats are also of the southern residents.

Indications of changing habitat have prompted some to question the need for such regulations in Puget Sound, but these results underscore their continued importance.

鈥淓ven though we鈥檙e seeing less of K and L pods, we still have to think about how our actions impact J pod. They鈥檙e still hanging around,鈥� Koehn said.

The study also notes that southern residents and Bigg鈥檚 are sharing habitat more often, though it isn鈥檛 clear whether they mingle or avoid each other. This raises questions about their relationship and underscores the importance of accounting for both in management decisions.

鈥淗aving more transients around could be good for the southern residents, because they eat marine mammals that also eat salmon,鈥� Rand said.

But if the southern residents avoid the transients, their increased presence could be disruptive. Researchers are actively studying threats to the southern residents 鈥� including prey availability 鈥� to support the imperiled population.

This analysis wouldn鈥檛 have been possible without consistent contributions from citizen scientists. People who report whale sightings using apps like Whale Alert help researchers provide data to policymakers, which can be consequential for the whales.

鈥淭his study quantitatively shows things that people have been suspecting,鈥� Rand said. 鈥淭here are more transients here in Washington, but the southern resident鈥檚 story is a bit more complicated.鈥�

Additional co-authors include of the Whale Museum and of NOAA Fisheries Northwest Fisheries Science Center.

This study was funded by Washington Sea Grant, NOAA Fisheries West Coast and the Puget Sound Partnership.听

For more information, contact Rand at zrand@uw.edu.

Every summer, , 天美影视传媒 associate professor of biology, and members of her lab head to northern Botswana to study how large predators, such as lions and African wild dogs, are affected by climate change and other shifts in their environment.

The researchers are particularly interested in understanding how these predators are changing their behavior 鈥� including where they go and when they reproduce 鈥� as the days get hotter and as the animals are more likely to come into contact with people. One example is a project studying how interactions between lions and wild dogs, which don’t typically get along, might change during heatwaves and droughts.

Abrahms is returning to Botswana again this summer, along with two other researchers in her lab: , a UW research scientist in biology, and , a UW doctoral student in biology. , UW professor of environmental and forest sciences, will also be joining for parts of the season. UW News asked Rafiq and Poulin a few questions about their upcoming work for the occasional series 鈥�In the Field,鈥� which highlights UW field efforts.

Tell us about the trip. Where are you going?

Kasim Rafiq: Our team will be traveling to the fringes of the . We have a long-standing partnership with , which has been operating a long-term monitoring program there since the 1990s. As part of this program, Wild Entrust operates a remote bush camp that we work out of, which we affectionately call “Wild Dog Camp,” or “Dog Camp” for short. This is really just a collection of tents in the middle of the African bush, and everything is non-permanent, meaning it could be quickly taken apart.

The camp is located in an area managed by the local community for wildlife tourism, and it borders the . So, it鈥檚 a wild landscape with lots of wildlife and lush vegetation. There鈥檚 no fence around the camp, so it鈥檚 not uncommon for animals to wander through the camp day and night, including lions, elephants, leopards and various species of snakes.

Have you visited this site before?

KR: I first came to Dog Camp in 2013 as a research assistant and then I completed my master鈥檚 and doctoral research there studying leopards. For my doctoral project, I stayed at the camp for two years because leopards are pretty tricky to study. I’ve been back to Dog Camp every year since I joined the Abrahms Lab as a research scientist in 2021.

I feel very privileged to have been able to work with the people in camp for such a long period of time. It鈥檚 been special to see how the camp has developed over that period, and also to maintain relationships with the Botswana-based teams.

MP: I joined the Abrahms Lab in 2024 and spent time in the field that year to become familiar with the carnivores that we study. I returned in 2025 and I began to learn essential field skills, such as how to track and follow carnivores in the bush. I鈥檓 excited for my third visit to the field site this year.

How do you study these creatures?

KR: We use a combination of techniques. We directly watch these predators and use new conservation technologies to monitor animals year-round and during periods when it鈥檚 just not possible to follow them, such as when it’s too wet.

One key technology we use is wildlife tracking collars that use GPS sensors to let us see where the animals are going and accelerometers and microphones to let us know what they鈥檙e doing. We like to think of these collars as Fitbits for wildlife. Just like your fitness tracker helps you better understand your movement and your sleep, these collars allow us to get deep insights into an animal鈥檚 behavior.

Can you talk about some of the projects you’re working on?

MP: I鈥檓 looking at how social structure in wild dogs may influence how they respond to environmental change. Wild dogs live in tight-knit packs, just like grey wolves in North America. In each pack, usually only one lead pair has pups, while the rest of the pack 鈥� often aunts, uncles and older siblings 鈥� all work together to babysit, feed and protect the pups.

In my research, I am investigating how a pack鈥檚 “social profile,” such as its size, family ties and history, affects how the animals adjust their movement patterns during heatwaves and droughts. I’m also looking at how increasing temperatures affect the timing of these dogs’ reproduction.

Overall, I鈥檓 interested in understanding if the benefits of living in a group, such as the higher hunting success, pup care, and reproductive success seen in larger packs, might help buffer the impacts of environmental change on animal populations.

What are your goals for this trip?

KR: This year, our plan is to deploy tracking collars on the long-term lion and African wild dog study populations across our field site. The data that we’ll get from these collars is crucial for helping us understand how behaviors change year after year as a result of environmental change.

A key part of this field season will also involve following animals with these sensors and collecting video recordings of them doing different behaviors, such as where and how they hunt and feed. We will use the video data to train AI models that allow us to better understand how climate change is affecting these behaviors.

What鈥檚 something you really enjoy about doing this field work 鈥� especially something that might not occur to most people?

KR: Two of the things I enjoy most are the behind-the-scenes parts of the work that are critical to this type of fieldwork, but that people rarely think about or see.

First, I really enjoy tracking animals. There鈥檚 something quite meditative about following a wild animal鈥檚 footprints through the grass.

The second is vehicle mechanics. Around 80% of fieldwork is fixing your Land Rover when it breaks down for some unknown reason, and although that tinkering can be frustrating, it鈥檚 also fun. Some of my favorite memories in the bush come from sitting in the sand and taking apart the engine.

MP: I love tracking animals using radio telemetry. The tracking collars we put on animals send out radio signals that we can detect with an antenna and receiver. By listening for the “ping,” we can tell which direction the animal is in and roughly how far away it is. The carnivores we study roam across huge areas, so tracking them often means a lot of driving on rough roads and not always having successful searches. But, hearing that first 鈥� often really faint 鈥� “ping” is always super exciting, and finding the animals feels rewarding.

I also especially love being in the field around sunrise and sunset, when the landscape looks golden, feels peaceful and the animals are most active.

More generally, is there anything you find surprising about doing field work?

KR: Although fieldwork is intensive and often the busiest part of the year, it鈥檚 busy in a very different way from office work. I鈥檓 often surprised that, despite the long hours, I feel more energized in the field than I do at my desk. I think part of that comes from being so close to the animals and the landscape you鈥檙e trying to understand.

I鈥檓 also a big believer that, although technologies like GPS collars and audio recorders now allow us to collect huge amounts of data from the comfort of our offices, those data are only as useful as our ability to interpret them. To do that well, you really need to understand your study animal. There are many ways to build that understanding, from reading books to watching documentaries, but for me, nothing compares to spending time in the field. I always come back with a dozen new ideas that have appeared while simply sitting and watching the animals.

MP: Doing field work is really enlightening. It鈥檚 extremely valuable because it gives us a better understanding of the animals and their environment. By observing where animals spend their time, how they interact with one another and with other species, and the challenges they face, we can develop more meaningful research questions. Spending time in the field also sparks creativity, because it allows us to see and notice unexpected behaviors and inspires new ideas for research.

For more information, contact Rafiq at rafiqk@uw.edu and Poulin at mpoulin1@uw.edu.

The ShakeAlert earthquake early warning system has been rapidly expanding since its launch in 2021. Now, researchers at 天美影视传媒 affiliated Pacific Northwest Seismic Network (PNSN) have finished all planned installations, bringing the two-state total to spread across Washington and Oregon.

ShakeAlert detects ground motion from earthquakes before it is felt, giving people precious time to drop, cover and hold on. An earthquake exceeding magnitude 5 will trigger an automated cell phone alert from the , or WEA, which also sends AMBER alerts. Millions of people benefit from the network as is, but the researchers are still exploring ways to improve it.

鈥淲hen we launched ShakeAlert, we felt confident that we had enough seismic stations to do a good job with early warning, but that wasn鈥檛 the optimal number. Now, with the buildout complete, we have coverage where it was lacking at launch,鈥� said , director of PNSN and a UW professor in Earth and space sciences.

However, expanding the network to include sensors on the ocean floor could help Pacific Northwest residents contend with the area鈥檚 greatest hazard 鈥� the Cascadia Subduction Zone.

The West Coast is a hotbed for seismic activity. Nestled in the , an array of volcanoes circling the Pacific Ocean where 90% of Earth鈥檚 quakes occur, the region鈥檚 volatile geology clashes with its growing population. Early warning systems can give people seconds to minutes of time to prepare for shaking, and a sense of how strong it will be.

Just over a year ago, a midsized earthquake under Orcas Island offered ShakeAlert in Washington. Multiple seismometers in the area picked up the signal and ran it back to headquarters for verification. The earthquake wasn鈥檛 quite big enough to trigger a WEA automated alert, or cause major damage, but in the affected region it did notify people听with early warning apps such as MyShake, as well as all Android mobile devices.

鈥淭he system detected the earthquake rapidly, accurately assessed its magnitude and automatically sent out a warning 鈥� all in a handful of seconds,鈥� said Tobin. 鈥淚t was the first event that met all the criteria in Washington and it worked really well.鈥�

During a larger earthquake, warnings will be automatic no matter the app or operating system. Warnings will also trigger certain public safety measures: Schools can connect PA systems to ShakeAlert for rapid updates, public transit may slow trains to avoid derailment and fire station doors will go up to allow firetrucks out even if electricity is lost.

Right now, the system is most effective for land-based earthquakes because the sensors are on land. Expanding the sensor network to include offshore, ocean bottom seismometers could improve detection and warning time for offshore earthquakes, namely a much-anticipated megathrust earthquake at the Cascadia Subduction Zone.

鈥淭he fundamental problem we have is that our seismic network 鈥� hundreds and hundreds of stations 鈥� is on land, but the biggest earthquake hazard comes from off our coast,鈥� Tobin said. 鈥淓arthquake detection works much better when the earthquake is in the area of your network, not off to one side.鈥�

Seismometers can be placed on the ocean floor, but they must be connected to cables for early warning, which is expensive. Japan installed an impressive that cost $120 million following the devastating 2011 earthquake. The country now has more than 200 seismometers covering its subduction zones.

The Cascadia Subduction Zone has a handful of existing offshore sensors 鈥� five near Vancouver Island and two off the coast of Oregon. A UW-led project this summer to the Oregon cable, which spans hundreds of seafloor miles, crossing the subduction zone twice. None of the offshore sensors are in the ShakeAlert network, but adding them could be impactful.

, a UW postdoctoral researcher in Earth and space science, recently at the Seismological Society of America鈥檚 annual meeting detailing the potential benefits of adding offshore seismic monitoring.

Krauss found with modeling that incorporating just a few ocean bottom sensors improved detection time for offshore earthquakes and warning time for millions of people. In hypothetical earthquake scenarios, the sensors picked up ground motion faster and improved magnitude estimates because they were closer to the fault.

鈥淪hakeAlert is all about figuring out that an earthquake is happening as fast as possible, so having sensors nearby is essential,鈥� Krauss said. 鈥淏ut in these magnitude 8 or 9 scenarios, it’s not just about detecting it, but realizing how big it is, and fast.鈥�

The researchers also explored incorporating telecommunications cables into the sensor network using a method called distributed acoustic sensing (DAS), which records ground motion based on cable stretch. Incorporating DAS could extend the reach of existing cables even further than sensors, translating to 鈥渉uge warning time improvements,鈥� Krauss said.

Different combinations produced varying improvements in both detection and warning time, depending on where the hypothetical earthquake occurred. Regardless, having sensors always beat not having them. While there are several hurdles to clear before ocean bottom sensors can be brought into ShakeAlert, Krauss said none are insurmountable.

鈥淎lthough we鈥檝e marked this milestone of completing our station buildout, that doesn’t mean we鈥檙e not continuously improving the ShakeAlert system,鈥� Tobin said. 鈥淲e鈥檙e working to make it faster, better and more reliable.鈥�

For more information, contact Tobin at htobin@uw.edu and Krauss at zkrauss@uw.edu.听听

Fish that split their lives between fresh and salt water often face obstacles getting back and forth. Dams and roads fracture river networks and interfere with traditional migratory routes, sparking concerns about fish health and abundance, as well as biodiversity on a broader scale.

Efforts to restore fish passage are cropping up across the country, but these projects come with hefty price tags. In a new study, , 天美影视传媒 researchers explore whether this money is being well spent by examining the process that determines which projects are prioritized.

The current standard, called score and rank, involves evaluating barriers one by one and assigning a score based on potential gains, such as habitat expansion. Top-ranking projects become leading candidates for funding, but score and rank systems don鈥檛 always account for barriers in the full river context. High-scoring projects can yield stranded investments, where removing the barrier doesn鈥檛 have the desired outcome because of other barriers downstream or immediately upstream.

鈥淚deally, barriers that are most downstream will score higher, because they need to come out before the fish can benefit from upstream restoration, but approaches to scoring vary, so this isn鈥檛 always the outcome,鈥� said lead author , a UW associate professor of marine and environmental affairs.

As an alternative to score and rank, this study presents a mathematical computer program called optimization. Optimization synthesizes many inputs to make the most of a budget. It can serve as a performance indicator for other systems and highlight opportunities for improving an underperforming system.

鈥淚t’s looking at a portfolio instead of going barrier by barrier. In doing so, you can explicitly account for watershed connectivity and evaluate the performance of score and rank,鈥� Jardine said.

As concerns about the health of rivers mounted in recent years, state and federal governments have allocated billions of dollars toward reconnecting them. Fragmentation is an established threat to biodiversity, and recent studies show that a vast majority of river length is not protected by conservation measures.

Washington state is in the midst of a court ordered multibillion dollar effort to remove barriers that block salmon and steelhead from swimming upstream to spawn. The combines score and rank with optimization in a hybrid approach. Similar projects elsewhere tend to use score and rank.

鈥淚 think people see optimization as a black box because it’s not as obvious why a barrier rose to the top of the priority list,鈥� Jardine said. 鈥淲ith score and rank, they understand the scores and the process, but we don鈥檛 really know what the outcome will be.鈥�

In this study, researchers use fish passage in Western Washington as a case study to compare score and rank to optimization. They show that score and rank performs decently well when the only goal is opening up as much habitat as possible, but adding other variables into the mix, such as habitat quality, compromises its performance.

While optimization has the capability to balance variables, it might not work for everyone. The program needs data to run and someone with a mathematical background to run it. Still, even small tweaks to the score and rank approach can produce results that rival optimization.

鈥淢ajor change is hard, but minor changes may be enough,鈥� Jardine said.

Because these projects often represent the values of multiple stakeholders, it鈥檚 important to include safeguards against stranded investments.

鈥淵ou need to work from downstream up to make sure the success of a project isn鈥檛 contingent upon other projects,鈥� Jardine said. 鈥淲e鈥檙e spending a lot of money on this, but the total cost of restoring all barriers is much higher than the budget, so it’s really important that we make the most out of the financial resources that we have.鈥�

Additional co-authors include , a UW postdoctoral researcher in environmental and marine affairs; , who completed this research as a UW master鈥檚 student in environmental and marine Affairs;听 J Kahn, who completed this research as a UW master鈥檚 student in quantitative ecology and resource management; Andrew Cooke, a UW research consultant in environmental and forest sciences, , a UW research scientist in environmental and forest sciences; , a UW associate professor of aquatic and fishery sciences and , , , and of NOAA.

This study was funded by Washington Sea Grant and the Rae S. and Bell M. Shimada Endowed Faculty Fellowship in Memory of Warren S. Wooster.

For more information, contact Jardine at jardine@uw.edu.听 听听

Plants may not appear aggressive, but they can still defend themselves while under attack. When caterpillars chomp the leaves of bean plants, these plants release gases that lure predatory wasps. The wasps prey on the caterpillars, saving the plants from further destruction. In a paper , a UW-led team demonstrated that this defense strategy is run by a protein called INR, or inceptin receptor. The researchers grew bean plants with naturally occurring mutations in the INR gene alongside plants with functional INR in an experimental field in Oaxaca, Mexico. The knock-out plants didn’t emit gases and attracted far fewer wasps. This result helps explain a previous study by this team that first identified the biochemical pathway behind this defense mechanism. These results also showcase how the tiny actions of a single protein can affect the behavior of wasps and caterpillars, and in turn, protect the health of the plant. This could benefit nearby plants as well, the researchers said. Beans are often grown alongside “,” such as corn, with the idea that each plant provides a benefit for the others. Beans help make the soil richer for their companions, and, through the actions of INR, could also protect their neighbors from pests.

For more information, contact senior author , UW associate professor of biology, at astein10@uw.edu.听听

The other UW co-authors are , , , and . A full list of co-authors and funding is included .

Decades of satellite data show Himalayan rivers migrating rapidly in response to climate change

The movement of rivers is often described in terms of flowing water, but the path a river takes can also change. Some migration is normal, but in the Himalayas, rivers seem to be scrambling faster than scientists anticipated. In a study , researchers show that rivers in the Tibetan Plateau moved twice as much from 2000 to 2020 as they did from 1980 to 2000. As glaciers melt and frozen ground thaws in response to rising temperatures, rivers are inundated with silty meltwater from surrounding glaciers. The water picks the path of least resistance through softening ground. The 鈥渕ovement鈥� includes small lateral shifts, big swings that cut off entire sections of river and occasionally, . The international team attributes their observations to climate change, which is driving temperatures up faster here than many other places. More than 2 billion people rely on these rivers for fresh water and researchers are concerned about communities downstream, as well as the potential for similar patterns that may play out elsewhere.

For more information, contact co-author , UW professor of Earth and space sciences at bigdirt@uw.edu.听听

A full list of co-authors and funding is .

Researchers shrink eye-catching structure down to the nano scale听

made using a network of freestanding bars suspended by a web of thin, tense cables. The organization of the bars and cables allows the network of tension and compression forces to lock everything into place, creating a lightweight yet stiff structure. Tensegrities of different sizes are common in nature 鈥� examples include and the that help living cells maintain their shape 鈥� as well as in diverse manmade structures like , and . Now, a team of engineers at the UW have found a way to create tensegrities as small as five micrometers across 鈥� roughly a tenth of the width of a human hair. in the aptly-named journal Small, researchers used a specialized and a resin compound to print bar-and-cable structures about 30 micrometers across. They then heated the materials to 900 degrees celsius, causing the structures to shrink by over 80%. As they shrank, the thinner cables constricted more than the bars, resulting in nanostructures with specific, locked-in levels of stress that were up to 250% stiffer than the starting structures. The team is now working on ways to build larger materials composed of tiny tensegrities, which could eventually usher in a new class of stiff, light and impact-resistant materials.

For more information, contact lead author , a UW doctoral student of mechanical engineering.

Other UW co-authors are , , Zainab S. Patel, , and . Funding information is included .听

Scientists find a key water source for atmospheric rivers

In December 2025, brought a seemingly endless onslaught of precipitation to Washington that caused and washed away roads and homes. In published in the Journal of Geophysical Research: Atmospheres, UW researchers help explain where all that water came from. They describe a link between the , a weather pattern that brings moisture east across the Pacific, and atmospheric rivers. Hypotheses about this connection have emerged from previous studies, but researchers couldn鈥檛 physically draw it until now. By tracking precipitation and wind patterns from 2000 to 2024, the UW researchers show that heavy rainfall and flooding are more likely when MJO is active, which happens several times a year. By identifying the MJO as a key moisture source for powerful atmospheric rivers, the researchers hope to improve forecast accuracy and give people more lead time to prepare for incoming storms.

For more information, contact co-author , UW professor of atmospheric and climate science at shuyic@uw.edu.

Other UW co-authors are and . Funding information is .

Over the past decade, cities around the world have increasingly turned to nature-based infrastructure to become more resilient in the face of a changing climate. Urban forests provide shade during heat waves and improve air quality; wetlands filter stormwater and reduce flooding; and restored oyster reefs filter water, create habitat and reduce wave energy along shorelines. When carefully designed and managed, these 鈥渘ature-based solutions鈥� can support climate adaptation, biodiversity and public health.

There鈥檚 a catch, however: Living things are not static building materials. They evolve and adapt in response to changing conditions, sometimes in unpredictable ways. As the climate shifts, the natural systems that humans depend on shift too.听

, professor of urban design and planning at the 天美影视传媒, studies how cities and nature influence one another. in Science, Alberti and collaborators explore how evolutionary change can affect the long-term performance of nature-based solutions.

UW News spoke with Alberti about what鈥檚 at stake and how city planners can work with evolution rather than simply reacting to it.

Why did you want to study evolution within nature-based solutions?

MA: Today, an increasing share of infrastructure investment is going to nature-based solutions because they can cost-effectively reduce climate-driven risks to cities while supporting biodiversity, public health and climate adaptation. However, their long-term performance depends on a fundamental biological process that is still rarely considered in design: evolution. These systems are not static infrastructure. They depend on living organisms 鈥� plants, microbes, oysters, corals and others 鈥� whose traits can shift over time as urban environments change. Cities expose these organisms to heat, drought, flooding, pollution, nutrient enrichment, disease, habitat fragmentation and new species interactions. Those pressures influence which organisms survive, reproduce and continue providing the ecological functions that cities rely on. Over time, ecological and evolutionary responses may alter the very processes that allow these systems to cool neighborhoods, filter water, stabilize shorelines or reduce wave energy.

So the central question is not simply whether a project works on day one. It is whether it can continue to perform as the organisms within it respond to climate stress, urban pressures and the intervention itself.

The problem is that implementation of nature-based solutions is outpacing the science needed to evaluate long-term performance. For these solutions to serve as resilient infrastructure, they must be designed as living, dynamic, evolving systems.

Did you find examples where evolutionary change can affect infrastructure performance?

MA: We found examples showing that evolutionary change can affect traits directly linked to the performance of nature-based solutions. Urban or climate pressures can favor traits that alter the processes these systems rely on, affecting their ability to deliver intended functions.

For example, coastal marsh plants such as are used to stabilize sediment, reduce erosion and help buffer waves. In marshes exposed to excess nutrients from sources such as fertilizer runoff, wastewater, stormwater and upstream land use, however, Spartina can shift biomass allocation toward shoots and away from roots. This shift can reduce the sediment-stabilization function that restoration projects depend on.

In another example, urban tree populations may evolve greater drought tolerance to help them survive hotter and drier periods. But evolutionary responses that improve survival do not necessarily preserve the desired functions for cities. Those trees may persist but grow more slowly or produce less canopy, which could in turn reduce shade, carbon uptake or pollutant removal.

When can evolution strengthen nature-based solutions?

MA: Evolution can strengthen nature-based solutions when populations have enough variation in traits to help them survive and retain their function under changing conditions. Coral reefs are a great example of this. Corals build reef structure, support biodiversity, store carbon and help reduce wave energy along shorelines. and functional decline. To increase their resilience, researchers are testing assisted-evolution approaches, . On the Great Barrier Reef, this includes selecting corals that maintain photosynthetic performance and stable symbiotic relationships under heat stress.

These approaches could help sustain reef-based coastal protection as oceans warm, but they also carry risks, including reduced genetic diversity, tradeoffs with other functions and uncertain responses to future conditions.

Oyster reefs show the same principle in another coastal system. filter water, create habitat, support fisheries and build reef structures that reduce wave energy. They face disease, warming, acidification, and low oxygen. Selective breeding and genomic tools can help identify oyster lines better suited to these conditions, but restoration efforts should avoid narrowing genetic diversity. Genetically diverse, site-appropriate stocks are more likely to maintain the functions that coastal communities value.

What were your biggest takeaways from reviewing the available research?

MA: The key lesson is that nature-based solutions are not static assets. Their performance depends on ecological and evolutionary processes that continue after design and deployment.

A second lesson is that context matters. In urban environments, environmental factors, such as temperature, pollution, hydrology and soil conditions, can vary across neighborhoods, blocks and shoreline segments. The same species or design may therefore perform differently in different parts of a city.

Third, variation is central to resilience. Genetic diversity, trait diversity and community diversity can increase the capacity of a system to respond to changing conditions.

Fourth, current adaptation does not guarantee future performance. Populations of organisms in long-urbanized environments may be adapted to present conditions, but those adaptations may not align with future climates.

Finally, a reminder and a caution: Evolution does not necessarily favor the traits that make species effective nature-based solutions. Traits that help organisms persist under urban stress may not be the same traits that support cooling, water filtration, shoreline protection or habitat formation. The challenge for planners is to design and manage these systems so that survival and function remain aligned over time.

What steps can urban designers and planners take?

MA: Planners should design for long-term performance. That means asking: Which organisms provide the desired function? Which traits matter for that function? What environmental pressures will those organisms face? Is there enough genetic, trait or species variation to support future adaptations?

In practice, this means using diverse, site-appropriate source material and considering both local adaptation and future climate conditions. It also means reducing pressures that can weaken performance, such as excess nutrients, contaminants and pollution, while maintaining the habitat conditions organisms need to persist and adapt over time.

It also means monitoring differently. Cities should track not only whether a project is working now, but also whether the organisms, traits and ecological processes that support its performance are changing over time.听

Designing nature-based solutions for changing climate conditions requires sustaining genetic diversity, supporting ecological function and maintaining evolutionary potential.

UW co-authors include , a doctoral student of urban design and planning. A complete list of co-authors is .

This research was funded by the National Science Foundation.

For more information, contact Marina Alberti at malberti@uw.edu.

础濒补蝉办补鈥檚 was home to beluga whales in the late 1970s, but today the population hovers around 300. Despite almost two decades of recovery work, the whales aren鈥檛 bouncing back. The Cook Inlet belugas are likely struggling under multiple pressures, including increasing human noise. Researchers are working on deciphering whale-whale communication to better account for the impact of noise on this vulnerable population.

In a new study, 天美影视传媒 scientists eavesdropped on Cook Inlet belugas, recording more than 1,700 calls representing 21 different behavioral encounters. This work builds on a 2023 study showing that noise from commercial shipping, the primary industry in the region, masks common beluga calls. Although many marine mammals rely more on sound than sight, our understanding of acoustic communication among these animals is limited.

Beluga whales use vocalizations to socialize, stick together and avoid danger. The new study, , investigated the behavioral, social and environmental contexts in which the whales produce various calls.

鈥淲e knew that human-generated noise was masking their calls, but we didn’t know what those calls were used for,鈥� said, a UW doctoral student in aquatic and fishery sciences. 鈥淭his study gave us important insights into the world of beluga communication and how it is disrupted by industry and development.鈥�

They found that Cook Inlet belugas use a specific type of call 鈥� a combined call 鈥� when calves are present. Combined calls were one of the call types that got drowned out by shipping noise in the 2023 study, suggesting that shipping noise could be disrupting communication with calves. If mothers and calves can鈥檛 remain in contact, it could spell trouble for the young whales.

鈥淲e don鈥檛 have the data to directly connect noise and calf separation,鈥� Brewer said, 鈥渂ut if a mother whale can鈥檛 acoustically keep in contact with her calf, that could be a huge problem.鈥�.

Researchers also found that calling between whales increased right before a behavioral change in the group, such as a transition from socializing to traveling, and when the tide was coming in. The call rate for individual whales decreased as group size increased, suggesting that individuals call less in a big group, perhaps to avoid talking over each other.

In Cook Inlet, where the whales live year round, silty glacial water gets churned up by powerful currents and dramatic tides. Beluga whales likely moved in after the last ice age, roughly 10,000 years ago. Vocal communication and echolocation, a navigational strategy used by bats and some whales, have allowed them to survive in this extreme environment, but human noise presents a newer challenge.

鈥淭heir main foraging hot spots for salmon are in the northern part of the inlet, near Anchorage, and in close proximity to the airport, the Port of Alaska, and the military base. I think there are ways to adapt but it鈥檚 tricky for them and noise pollution is far from the only threat,鈥� Brewer said.

Beluga whales in the St. Lawrence Estuary in Eastern Canada 鈥� also very noisy 鈥� have evolved to , perhaps in response to lower frequency anthropogenic noise. They also make their when it’s noisy, just like two people conversing at a party would.

In the Puget Sound region, where the endangered Southern Resident killer whales live, when whales are reported in the area. Smaller ships are legally required to keep their distance and slow down within half a mile of the whales. This program was introduced after researchers demonstrated that .

鈥淭he Port of Alaska could explore similar strategies to mitigate the impact of industry,鈥� Brewer said. 鈥淲e can鈥檛 halt shipping, but we鈥檙e trying to understand what we can do to manage these critical habitats, especially when the animals are nearby.鈥�

Co-authors include , a UW assistant professor of aquatic and fishery sciences;听 , a UW professor of aquatic and fishery sciences; , a UW assistant professor of aquatic and fishery sciences; , a research scientist in the UW Cooperative Institute for Climate, Ocean, & Ecosystem Studies; of NOAA; Christopher Garner and Andrea Gilstad of the Air Force Conservation Department.

This study was funded by UW School of Aquatic and Fishery Sciences, the Cooperative Institute for Climate, Ocean, and Ecosystem Studies under a NOAA Cooperative Agreement, and the H. Mason Keeler Endowed Professorship in Sports Fisheries Management.

For more information, contact Brewer at arialb@uw.edu.听 听

In early April, a powerful typhoon formed over the northwestern Pacific Ocean, as it swirled toward the Mariana Islands, a 15-island archipelago east of the Philippines. By the time it on April 14, the wind was gusting 130 miles per hour, rain fell in sheets and huge waves pounded the shores.

This super typhoon, called Typhoon Sinlaku, was among the strongest early-season storms recorded in the past 75 years. It caused widespread damage on the islands 鈥� home to approximately 50,000 people 鈥� leaving most without power, tearing roofs off homes and destroying vital infrastructure.

The U.S. Commonwealth of the Northern Mariana Islands, or CNMI, includes 14 of the islands in the archipelago and the remaining island, Guam, is a U.S. territory. The residents, a mix of Indigenous Chamorro people and settlers, are American citizens and U.S. institutions and agencies are well represented on the islands.

On Rota, 天美影视传媒 researchers have been working to stabilize the population of the endangered Mariana crow for decades after research signaled rapid decline. , a UW professor of environmental and forest sciences, and , a UW professor of environmental and forest sciences, oversee several projects on Tinian, a small forested island roughly 12 miles long and 6 miles wide.

The first project, launched in 2021, focused on a small, formerly endangered songbird called the . It has since expanded into broader study of native birds and plant restoration.

UW News spoke with Gardner, , a research scientist in Gardner鈥檚 lab, and , a graduate student in Bakker鈥檚 lab, about the impacts of the typhoon and how they plan to resume their work on the islands.

What first brought you to Tinian? What makes the island unique?

Beth Gardner: We were initially approached by a consulting firm with a contract to study the Tinian monarch, which led us to form a relationship with the U.S. Navy based on the island. They were impressed by our work and efforts to integrate into the community and funded our group to continue developing research on Tinian.

Kaeli Swift: Tinian鈥檚 unique ecological character reflects its complicated history. The island is about 60% forested but the forests are primarily composed of a mix of introduced species. Centuries of colonization 鈥� by the Spanish, Germans, Japanese and now U.S. 鈥� has resulted in immense habitat destruction. Tinian was heavily bombed during World War II and then became the U.S. point for the atomic bomb.

Fletcher Moore: By the end of the war, over 95% of the forest had been cleared, obviously to the extreme detriment of all the native plants and animals. Now, over two-thirds of the island is controlled in a lease agreement by the U.S. military. That land is largely undeveloped, but the U.S. military plans to invest in major new projects on Tinian in the next decade.

What does your work involve?

KS: We have been doing on Tinian for five years. We鈥檙e trying to understand threats to native birds by studying offspring survival and predator populations 鈥� primarily rats and cats. Our recent work involves acoustic monitoring, specifically looking at how birds are impacted by human-related noise associated with development on the island.

FM: We are working on a long-term native forest restoration project based on the observation that the lack of native plants was limiting wildlife populations on Tinian. We are supporting development of a native plant nursery by partnering with local entities to enhance the space, hire full time staff, and collect and propagate plants. We had about 2,000 native trees representing 20 different species in the nursery, and planted about 300 of those trees in the past six months.

How will it be impacted by Typhoon Sinlaku?

FM: The site where we planted the young trees is on an isolated corner of the island that is difficult to get to in the best of times. Right now, the road is totally inaccessible. We鈥檙e not sure when we will be able to get out there to assess the damage and resume regular restoration work, like controlling invasive species and planting other species. The nursery also suffered a lot of damage; almost half of its plants were destroyed. So it’s going to require a pretty big reset.

KS: Our work involves venturing into the jungle to set up cameras and acoustic recording devices for monitoring birds. Our access to those sites will be limited until the roads are cleared and even then, the nature of the vegetative landscape will have changed. We can鈥檛 really compare data on birds from one year to the next when there have been major changes to vegetation on the island.

BG: That little songbird we study has probably gone quiet for now. As we鈥檝e seen in the past, their populations will likely suffer from this type of devastation. The typhoon sat on top of Tinian and Saipan for somewhere around 50 hours. We don鈥檛 know the full extent of the damage yet, but I think things will be completely different when we get back out there.

What happens now?

FM: It is difficult to access resources on the Marianas and especially hard on Tinian. We had to transport everything we needed for these projects from elsewhere. Shipping can take weeks or months and building materials are often twice as expensive as they would be on the mainland U.S.

When it comes to our work, it’s really difficult to see the nursery destroyed and to see the materials we spent months and a lot of money gathering torn apart. But, it’s going to be especially hard for the people who live on the island and don鈥檛 have grants funding their rebuilding efforts. So there are just a lot of practical challenges to recovery out there that even folks affected by disasters in the mainland U.S. might not face to the same degree.