University of �鶹��ý at Mānoa Professor Emeritus of and pioneering marine microbiologist , was as a Fellow of the European Academy of Microbiology. The recognition celebrates outstanding scientific achievement and leadership in microbiology.

DeLong is considered a trailblazer in the field of metagenomics—the study of all genetic material from all organisms in a particular environment—whose research has transformed understanding of the ocean’s microbial life. His work advanced innovative gene cloning and sequencing, allowing scientists to study complex marine microbial communities and their role in the environment without the use of traditional microbial cultures.

“I was thrilled to hear the news about Ed’s election to the European Academy of Microbiology, a well-earned honor,” said David Karl, UH Mānoa oceanography professor,DeLong’s long-time colleague and co-director of both the Center for Microbial Oceanography: Research and Education and the . “Ed and other newly elected members represent the second golden age of microbiology, one centered on microbial oceanography and ecology.”

Scientific breakthroughs

Early in DeLong’s career, he used methodologies developed by his postdoctoral research advisor Norm Pace to identify microbes “in the wild.” Together they discovered two new lineages of a major microbial group called Archaea (previously not thought to live in seawater) were abundant everywhere—from in the Pacific Ocean to Antarctica, and from the sea surface to the seafloor.

Later, new methods that DeLong’s group adapted from the Human Genome project to study microbial ecology led to the discovery that most bacteria in the upper ocean can use sunlight to generate biochemical energy using proteins called opsins. This finding revealed a widespread, previously unknown solar energy-gathering mechanism in the ocean, with significant implications for the global carbon and energy cycles.

“To be recognized and honored by world-renowned microbiologists of the European Union was unexpected, and very humbling,” DeLong said. “I believe that scientific disciplines like microbiology should have no geographic or cultural boundaries—yet in today’s political landscape there are increasing challenges to free and open international collaborations. To me, this makes recognition by the European Academy of Microbiology all the more potent of an honor.”

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An analysis of more than 2,300 seawater samples from more than 20 field studies around the globe indicates that human-made chemicals—from plastic additives and industrial lubricants to pharmaceuticals and pesticides—are widespread in the marine environment, particularly in coastal and estuarine waters. The study, co-authored by University of �鶹��ý at Mānoa oceanographers and led by biochemists at the University of California, Riverside, represents one of the most comprehensive chemical analyses of coastal oceans to date.

The team analyzed seawater samples collected over a decade from coastal regions from the Pacific, Atlantic and Indian Oceans. Reported in , the findings show that industrial chemicals, many of which are rarely monitored, are far more abundant and widespread than previously recognized.

“As part of this study we included samples from coral reefs across both the Pacific and Caribbean, including samples throughout Hawaiian and Tahitian ecosystems, and we were struck by how widespread things like pharmaceuticals, pesticides and plastics were even in some remote island reefs and dozens of kilometers offshore,” said Craig Nelson, researcher in the UH Mānoa , graduate chair of oceanography, and one of the senior authors on the paper.

“Even in places we consider relatively pristine, we found clear chemical fingerprints of human activity,” said Daniel Petras, assistant professor of biochemistry at University of California, Riverside. “The extent of this influence was surprising.”

Impacts nearshore and offshore

The study found that in datasets from coastal environments as much as 20% of the measured organic material was of human origin, compared to about 0.5% in the open ocean. In extreme cases, such as river mouths impacted by untreated or poorly treated wastewater, that figure exceeded 50%. Across all samples, the 248 identified human-derived compounds tracked in this study made up around 2% of the total detected signal.

While pesticides and pharmaceuticals were expected to be most concentrated near shorelines, the study found that industrial compounds, including substances used in plastics, lubricants and consumer products, dominate the anthropogenic (human induced) chemical signal in all areas of the ocean.

The researchers also found that anthropogenic chemicals persist well beyond the coastline. Even more than 20 kilometers offshore, human-derived compounds accounted for roughly 1% of detected organic matter.

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A team of researchers are calling for a new generation of carefully designed ocean iron fertilization (OIF) field trials to determine whether this marine carbon dioxide (CO2) removal method can safely and effectively leverage a natural ocean process to pull CO2 out of the atmosphere. Led by the Woods Hole Oceanographic Institution, the authors, including two from the University of �鶹��ý at Mānoa, argue that larger, longer studies with rigorous monitoring and clear “go/no-go” safeguards, are needed to accurately assess OIF as a potential long-term CO2 storage solution. The paper was .

“The ocean science community must explore all possible means for reducing atmospheric carbon dioxide levels, and identify any unintended ecological consequences,” said David Karl, co-author, professor of and director of the in the UH Mānoa (SOEST). “Humans continue to pollute our planet; the time for bold action is now.”

Past OIF field studies found that relatively tiny additions of iron in some parts of the ocean can stimulate the growth of small, plant-like organisms known as phytoplankton that live in the surface ocean. These organisms use sunlight and CO2 dissolved in seawater to grow and multiply, which in turn pulls more CO2 out of the atmosphere into the surface ocean in the process. However, those early experiments were not designed to assess the efficacy, durability and feasibility of OIF, nor did they specifically evaluate the broader ecological and biogeochemical impacts of large-scale additions of iron.

The next generation of trials would need to capture phytoplankton bloom development, and the process of bloom decay, the fate of newly produced carbon, and any potential ecosystem impacts. The authors propose experiments lasting more than 3–6 months and spanning an area of about 1,000 square kilometers, with an explicit requirement to document a return to natural conditions after iron additions end.

The authors suggested the Gulf of Alaska in the Northeast Pacific as a promising location based on the region’s low-iron conditions, the availability of decades of research in the area at Ocean Station Papa, evidence of natural iron-driven blooms in the past, and physical characteristics that may help keep the iron-fertilized patch from dispersing too rapidly.

After moving from the Philippines to Waipahu at age seven, Sean Michael Valencia Monte arrived at the University of �鶹��ý at ����ԴDz� with a clear mission: to transform his passion for microbial research into a career in environmental conservation. Building on award-winning Waipahu High School research in soil science, Monte joined the (GES) program in the (SOEST).

Since joining SOEST, Monte has been a part of research in various fields. In summer 2024, Monte participated in the Hollings Preparation Program, working with the NOAA Pacific Islands Regional Office on Hawaiian monk seal conservation. While assisting in pup taggings and conducting watches was exciting, his real takeaway was the human connections.

“The most important thing I learned was how to effectively engage with the public,” Monte shared. “I learned how to communicate science in a way that prioritizes both human safety and animal welfare.”

Transformative experiences

In summer 2025, he was selected as part of a five-student cohort that revived the UH Blue Water Marine Lab Program. Aboard the UH research vessel Kaunana, Monte gained hands-on training in plankton tows, marine mammal surveys, and the deployment of autonomous water sampling technology. And, through the National Student Exchange, he attended California State University, Monterey Bay for a semester.

“Spending a semester away from home taught me how much growth can come from the people you meet and the places you experience,” Monte shared. “I met incredible international students from France, Germany, Norway and Japan. Traveling across California and nearby states helped me gain independence and confidence. The experiences that I received proved to be transformative.”

Building connections and looking ahead

At UH ����ԴDz�, Monte is part of the SOEST Maile Mentor Bridge Program, which pairs undergraduate students with near-peer mentors.

“Through my Maile Mentor, Raffi Isah, I was able to connect with and secure GES thesis mentors, and the program has given me a space to share my goals, challenges and experiences with others who understand the demands of SOEST and are motivated by similar interests,” Monte said.

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The earned high marks in nearly 20 academic subjects in the , with , and leading the way among the highest-ranked programs.

Oceanography ranked No. 5 in the U.S. and No. 7 in the world, atmospheric science placed No. 8 nationally and No. 11 worldwide, and hospitality and tourism management ranked No. 12 in the U.S. and No. 32 in the world.

The rankings were released by the Shanghai Ranking Consultancy and is considered one of the most comprehensive and objective assessments of university performance by discipline.

UH Mānoa also posted strong global and national placements across science, engineering, social science and other fields. tied for No. 17 in the U.S. and ranked No. 51–75 worldwide, while ecology and each tied for No. 24 nationally and placed No. 76–100 globally.

Additional UH Mānoa subjects recognized in the 2025 rankings include communication, education, political science, water resources, biological sciences, civil engineering, food science and technology, environmental science and engineering, agricultural sciences, economics, management and physics.

“These rankings reflect the depth and consistency of excellence at UH Mānoa,” Interim Provost Vassilis L. Syrmos said. “Our faculty are advancing research that matters locally and globally, while preparing students to address some of the most pressing challenges facing our world.”

UH Mānoa was evaluated alongside approximately 2,000 universities from more than 100 countries and regions, selected from a global pool of more than 25,000 institutions. The rankings are based on measures such as world-class faculty, world-class research output, high-quality research, research impact and international collaboration.

Other recent rankings:

• 2026 Times Higher Education World University Rankings, October 9, 2025
• Wall Street Journal/College Pulse 2026 Best Colleges in the U.S. rankings, October 2, 2025
• U.S. News and World Report 2026 Best Colleges rankings, September 23, 2025

For more information, .

—By Marc Arakaki

University of �鶹��ý researchers have published a new study that brings together ʻike �鶹��ý (Hawaiian knowledge), ʻō������� �鶹��ý (Hawaiian language) and western marine science to shed new light on one of the ocean’s most elusive predators, the cookiecutter shark.

Rarely seen but often noticed, the cookiecutter shark is named for the distinctive wounds it leaves behind. Instead of tearing flesh, the small shark removes neat, circular plugs of meat that resemble the cut of a cookie cutter. These unmistakable bite marks are commonly found on prized fish such as ʻahi (bigeye tuna) and aʻu kū (swordfish), providing scientists with rare clues about the shark’s behavior in the deep, open ocean.

“What makes this species so fascinating is that we almost never see the shark itself,” said Justin Suca, an assistant professor in at UH ����ԴDz�. “We’re learning about it by studying when and where those bite marks appear.”

The interdisciplinary study was led by Suca, J. Hauʻoli Lorenzo-Elarco, an assistant professor of at Honolulu Community College and PhD candidate at the UH Hilo , and Donald R. Kobayashi and economist Hing Ling Chan from NOAA’s Pacific Island Fisheries Science Center (PIFSC).

Kobayashi, a biologist at PIFSC and UH ����ԴDz� alumnus, has been a cookiecutter shark enthusiast for decades.

“I’ve been intrigued by these small sharks for over 40 years, when I first learned about them while a graduate student in oceanography at UH ����ԴDz� and we would encounter them in net tows,” Kobayashi said. “These enigmatic creatures have resisted formal study due to their habitat, behavior, and apparent rarity, so it is quite gratifying to personally contribute some solid scientific knowledge towards understanding them and their ways!”

Night patterns

Published in, the study analyzed a much larger dataset than previous research, examining bite patterns recorded across �鶹��ý’s longline fisheries over many years. The results reveal clear and persistent trends: cookiecutter shark bites occur most often at night and are closely tied to lunar cycles, with higher activity during darker, low-illumination periods.

Searching the past

Alongside the scientific analysis, the researchers reviewed Hawaiian-language sources, including historic nūpepa (Hawaiian-language newspapers), and considered knowledge shared across Polynesian cultures to better understand how the shark may have been recognized in �鶹��ý. While no direct references were found, the team believes Hawaiian ancestors were likely familiar with the shark’s distinctive bite marks.

“Our kūpuna (elders) may never have encountered the shark itself,” said Lorenzo-Elarco. “But they almost certainly encountered the evidence it left behind, the distinctive bite marks on fish they brought in from the open ocean.”

ʻŌ������� in science

From that understanding, the team developed a new Hawaiian name for the cookiecutter shark, nahunaiki, meaning “little bites,” and created an ʻō������� noʻeau (Hawaiian proverb) describing its bite patterns and connection to nighttime conditions. The study also includes an abstract written entirely in ʻō������� �鶹��ý, highlighting how Indigenous knowledge and modern science can work together to reveal patterns that might otherwise remain unseen. Developed by utilizing elements of traditional Hawaiian proverbs, the ʻō������� noʻeau says, Muku ka malama, nanahu ka nahunaikio o ka pō, When the new moon arises, the cookie cutter shark bites.This ʻō������� noʻeau is aimed at helping current and future generations of ocean stewards connect the lunar cycle to the bites of this shark.

These findings build on earlier UH ����ԴDz� research that linked moonless nights to rare cookiecutter shark bites on humans, particularly swimmers in �鶹��ý’s ocean channels, suggesting darkness plays a key role across very different types of encounters.

Groundbreaking research uncovering life in one of Earth’s most mysterious environments—the deep sea—has earned Gabrielle Ellis, a University of �鶹��ý at ����ԴDz� graduate, the 2024–25 Dr. Clifford K. Mirikitani, MD, JD & John M. Mirikitani, JD, PhD Outstanding Dissertation Award from the .

Ellis, who earned her PhD from the , focused her research on tiny deep-sea animals living more than two miles below the ocean surface in the Clarion-Clipperton Zone, a vast area between �鶹��ý and Mexico. The region holds valuable mineral deposits important for renewable energy, but is also home to fragile and little-known marine life.

Her dissertation looked at how deep-sea communities change over time and across different habitats, from the smallest larvae to adult animals. By studying thousands of samples, Ellis created one of the most complete pictures so far of deep-sea biodiversity in an untouched environment.

“The award of the Mirikitani Outstanding Dissertation Award is an absolute honor both for me as an emerging scientist, as well as for the recognition of deep-sea ecology as a field,” Ellis said. “Despite increased attention to the deep sea emerging with discussions around deep-sea mining, more than 99.9% of the deep-sea is unexplored, and so many foundational questions are unaddressed. Working in the deep sea is inherently collaborative; we work on ships in the middle of the ocean for long periods of time and often rely on each other for ideas, data and support. As such, credit is also due to my collaborators, including my labmates and advisors, who have really inspired me throughout the years and are absolutely instrumental in the success of my research.”

Her findings include one of the largest collections of deep-sea larvae ever gathered and some of the first detailed information about how these species grow and survive. The work helps scientists and policymakers better understand how deep-sea mining and climate change could affect ocean ecosystems and what steps can be taken to protect them.

• Related UH News story: Rare glimpse at understudied ecosystem prompts caution on deep-sea mining, October 1, 2025

Ellis is now teaching environmental science at Georgetown University, continuing her mission to share the importance of ocean research and inspire the next generation of scientists.

The Mirikitani Outstanding Dissertation Award is given each year to one UH Mānoa PhD student whose dissertation demonstrates exceptional originality, significance and scholarly achievement.

The Department of Oceanography is housed in UH ��ā�ԴDz�’s .

Viewed from space, vast swirls of color appear nearly every summer in the Pacific Ocean north of �鶹��ý. For years, the origins of these massive blooms of photosynthetic microbes remained a mystery. Now, led by University of �鶹��ý at ����ԴDz� oceanographers provides the first comprehensive look at the anatomy of these events.

“This paper represents a synthesis of many different observational perspectives which, only when evaluated together, allowed us to paint the whole picture,” said Rhea Foreman, lead author of the study and researcher in the (C-MORE) in the UH ����ԴDz� (SOEST). “It required multiple people with a range of expertises to work together in order to see the overarching ecological processes.”

Race to sample the bloom

The North Pacific Subtropical Gyre is described as an ocean desert due to its low levels of nutrients. However, in late summer, a unique partnership forms between diatoms (marine microbes that live inside a glass shell) and diazotrophs (bacteria that convert nitrogen gas into a biologically usable form, essentially creating fertilizer for the system). Previous research established that summer blooms are often driven by this pairing, but beyond that, the causes of bloom initiation, sustenance and collapse were unknown.

In summer 2022, oceanographers used the R/V Kilo Moana to try and catch a bloom event. When they noticed on satellite imagery that a bloom the size of Minnesota was within range of the expedition, a race was on to investigate.

The team investigated the bloom’s microbial community, nutrient dynamics, composition of particulate matter, rates of photosynthesis and nitrogen fixation, and abundances of specific functional genes. Their study revealed that the blooms are likely triggered when the seed population of diatom-diazotroph associations experience favorable conditions such as: above-average concentrations of phosphate and silicate, and a shallower mixed layer at the surface ocean. This shallow mixed layer acts to corral the photosynthetic microbes, keeping them near the surface where sunlight is abundant—something they require for efficient nitrogen fixation.

“This comprehensive expedition required careful planning, skillful execution, effective teamwork and a bit of luck—we went four-for-four!” said David Karl, senior author on the study, Victor and Peggy Brandstrom Pavel Professor of Oceanography, and director of C-MORE.

Understanding lifecycles

The study also relied on the historical context provided by the UH ����ԴDz� (HOT) program that has conducted monthly monitoring of the physical, biological and chemical characteristics at a nearby open ocean field station north of the Hawaiian Islands since 1988.

“By comparing the 2022 expedition data to the HOT data, which shows baseline conditions at Station ALOHA, we were able to distinguish unique bloom characteristics from normal background conditions and that helped us understand the lifecycle of the bloom,” said Foreman.

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A multi-year scientific expedition including the University of �鶹��ý at ����ԴDz� and led by researchers from the University of California, Santa Barbara and collaborating institutions, were able to find critical connections between land, rainwater and lagoon waters.

The researchers determined that land use on tropical islands can shape water quality in lagoons and that rainfall can be an important mediator for connections between land and lagoon waters. These findings provide vital information for ecosystem stewards facing global reef decline. Their findings were published in .

“The links between land and sea are dynamic and complex, so it’s a topic that has remained elusive to science,” said Mary Donovan, co-author and faculty at the in the UH ����ԴDz� (SOEST). “It took a dream team to pierce through that complexity. We brought together a group of interdisciplinary thinkers, from students to senior investigators, across at least five major institutions to tackle this immense challenge.”

Understanding the phase shift

Scientists have long been concerned that with an increase in human-associated inputs from land to a coral reef, there is often a “phase shift”—a decline in corals accompanied by an increase in harmful algae. This ecological shift is often linked to excessive nutrients and changes in the microbial community, but the precise connection between land use and coral reef health has been poorly understood.

Through its investigation, the team found that nutrients in the lagoons off Moʻorea were highest in concentration closer to the island, lower farther offshore.

Informing stewardship efforts

“Gravity is a unifying force in ecology, and islands are always uphill from the coral reefs that surround them,” said Christian John, lead author of the study and postdoctoral scholar at the University of California, Santa Barbara.

Across Pacific Island systems, the flow of nutrients from mountains to the ocean is a central focus for coastal resource management. Targeted strategies, such as reducing polluted runoff, developing buffers along rivers, or actively mitigating soil loss at development sites, can significantly dampen the adverse effects of land use on lagoon water quality.

“The ahupuaʻa, land use divisions that connect mauka to makai, are central to watershed management here in �鶹��ý,” said Nyssa Silbiger, co-author and associate professor in the SOEST Department of Oceanography. “Understanding water quality is a fundamental challenge for everyone: it is key to assessing coral reef health and it is inseparable from human health.”

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Internationally recognized researchers currently or formerly affiliated with the University of �鶹��ý at Mānoa have been honored among the world’s most influential scientists in Clarivate’s 2025 . The annual analysis identifies just 1 in 1,000 researchers globally—including Nobel laureates—whose publications have demonstrated exceptional influence across their fields.

(SOEST) Professor Fei-Fei Jin and the late Director and Researcher Ruth Gates, were recognized in the cross-field category, which highlights researchers whose influence spans multiple scientific areas. Daniel Mende, a former SOEST postdoctoral researcher, was selected to the biology and biochemistry category.

“This distinction underscores the global influence of UH ��ā�ԴDz�’s research enterprise,” UH Mānoa Interim Provost Vassilis Syrmos said. “Our scholars drive discoveries that resonate across disciplines and continents, and their work exemplifies the innovation and excellence that define our university.”

SOEST Professor Fei-Fei Jin

Jin’s research interests cover a wide range of topics, including the dynamics of large-scale atmosphere and ocean circulations, and climate variability. His primary research focuses are understanding the dynamics of El Niño-Southern Oscillation, climate variability in the extratropical atmospheric circulation and global warming.

The late Ruth Gates

Gates was a tireless innovator and advocate for coral reef conservation. The focus of her most recent research efforts was creating super corals, coral species occurring naturally in the ocean that could be trained to become more resilient to harsh conditions.

Former SOEST postdoctoral fellow Daniel Mende

Mende specializes in environmental microbiology, microbial ecology, metagenomics and more. He came to UH Mānoa in 2014 for his postdoctoral studies on microbial communities in oceans. Mende is now an assistant professor at Amsterdam University Medical Center, University of Amsterdam.

These scientists are identified based on their publication of highly cited papers in the Web of Science Core Collection—a widely respected global citation database. Using rigorously curated data, analysts at the Institute for Scientific Information select individuals who have demonstrated remarkable influence in their field.

This story was compiled based on primary affiliation according to the Web of Science’s Highly Cited Researchers list. If there are other researchers currently or formerly affiliated with UH on the list, email Marc Arakaki at marcra@hawaii.edu.