marine science | University of Hawaiʻi System News /news News from the University of Hawaii Thu, 16 Apr 2026 01:18:00 +0000 en-US hourly 1 /news/wp-content/uploads/2019/04/cropped-UHNews512-1-32x32.jpg marine science | University of Hawaiʻi System News /news 32 32 28449828 鶹ýto lead new Pacific reef research institute /news/2026/04/16/pacific-reef-research-institute/ Thu, 16 Apr 2026 18:00:58 +0000 /news/?p=232177 The Pacific RRCI will be housed in UH’s Office of Land and Ocean Conservation Futures.

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coral reef with fish

The University of 鶹ý has been designated as a new Pacific Reef Research Coordination Institute (Pacific RRCI) by the (NOAA) to support coral reef conservation in the Pacific through research, collaboration and public education.

The Pacific RRCI will be housed in UH’s , under the aegis of the , and will perform the following critical functions: conduct federally directed research to fill national and regional gaps; collaborate with relevant states and territories, Indigenous groups, coral reef managers, non-governmental organizations, and other coral reef research centers; assist in the implementation of the NOAA’s National Coral Reef Resilience Strategy and coral reef action plans; build non-federal capacity for management and restoration practices; and conduct public education and awareness programs.

“This new institute combines UH’s strengths in cutting-edge, ocean-related research and our collaborative, place-based approach to working with resource managers throughout 鶹ý and the Pacific to protect our vital coral reefs,” said Chad B. Walton, UH interim vice president for research and innovation. “At the same time, it provides us with further opportunities to develop our region’s next generation of researchers and managers in the field of conservation futures.”

To restore and preserve coral reef ecosystems in the U.S. from natural and human-related effects, the Coral Reef Conservation Act of 2000 was reauthorized and modernized by the Restoring Resilient Reefs Act of 2021, which was included in the James M. Inhofe National Defense Authorization Act that became law in 2022. The reauthorized law required the designation of two RRCIs, one each in the Atlantic and Pacific basins, was required. The RRCIs were chosen from 32 preselected coral reef research centers and were designated based on the results of technical merit and panel reviews. The Restoring Resilient Reefs Act of 2021 was introduced and sponsored by 鶹ý Senators Brian Schatz and Mazie K. Hirono, and Congressman Ed Case.

The UH-led institute will be guided by experienced reef researchers from UH Mānoa’s Kewalo Marine Laboratory and the 鶹ý Institute of Marine Biology, UH ᾱ’s Marine Sciences program, and the University of Guam’s Marine Laboratory. It will support research, monitoring, capacity building and outreach for coral reef management throughout the U.S states and territories of American Samoa, Guam, 鶹ý, and the Northern Marianas Islands and with the Freely Associated States of the Federated States of Micronesia, the Republic of Palau and the Republic of the Marshall Islands.

“Many people worked many years to make this vision for collaborative reef research across the Pacific a reality,” said Suzanne Case, director of the Office of Land and Ocean Conservation Futures. “We’re excited to jump in with scientists and communities and agencies across the region to take it forward.”

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Global recognition for 鶹ýMānoa: 14 programs shine in new rankings /news/2026/03/25/qs-subject-rankings-2026/ Wed, 25 Mar 2026 10:01:35 +0000 /news/?p=231221 The 2026 edition analyzed the performance of more than 18,300 university programs taken by students at more than 1,700 universities.

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U H Manoa students walking

Fourteen University of 鶹ý at Mānoa academic subjects were ranked among the world’s best in the 2026 , released on March 25.

Four subjects placed in the top 22 in the nation and top 100 in the world. Leading the way was geology (No. 19 in the U.S. and No. 51–100 in the world), geophysics (No. 19 in the U.S. and No. 51–100 in the world), Earth and marine sciences (No. 21 in the U.S. and No. 51–100 in the world) and linguistics (No. 22 in the U.S. and No. 61 in the world).

Ten additional subjects placed in the world’s top 2% (within top 500 in the world out of ):

  • English language and literature: No. 28 U.S., No. 101–150 world
  • Agriculture and forestry: No. 30 U.S., No. 151–200 world
  • Anthropology: No. 31 U.S., No. 101–200 world
  • Modern languages: No. 41 U.S., No. 251–300 world
  • Environmental sciences: No. 66 U.S., No. 351–400 world
  • Communication and media studies: No. 68 U.S., No. 251–275 world
  • Physics and astronomy: No. 70 U.S., No. 401–450 world
  • Education: No. 78 U.S., No. 351–400 world
  • Medicine: No. 99 U.S., No. 451–500 world
  • Biological sciences: No. 100 U.S., No. 451–500 world

“These rankings highlight the exceptional work and commitment of our faculty, students and staff,” UH Mānoa Interim Provost Vassilis L. Syrmos said. “They showcase the university’s global standing and reinforce that UH Mānoa offers outstanding educational opportunities and experiences for both our local community and those joining us from around the world.”

UH Mānoa was ranked in three broad subject areas and 14 narrow subject areas. The QS World University Rankings by Subject are calculated using five criteria: academic reputation (measures the reputation of institutions and their programs by asking academic experts to nominate universities based on their subject area of expertise), employer reputation (measures the reputation of institutions and their programs among employers), research citations per paper (measures the impact and quality of the scientific work done by institutions, on average per publication), H-index (measures both the productivity and impact of the published work of a scientist or scholar) and international research network (measure of an institution’s success in creating and sustaining research partnerships with institutions in other locations).

The 2026 edition of the rankings by global higher education analyst Quacquarelli Symonds analyzed the performance of more than 18,300 university programs, taken by students at more than 1,700 universities in 100 locations around the world.

Other rankings

UH Mānoa also received these notable rankings:

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New 38-foot teaching, research vessel for 鶹ýᾱ’s marine science program /news/2026/03/03/kaiola-38-foot-teaching-research-vessel/ Tue, 03 Mar 2026 23:45:04 +0000 /news/?p=230355 The aluminum workboat, named Kaiola, meaning “living sea,” arrived from Oregon in February.

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2 men standing next to aluminum workboat
From left, Kainoa Hauanio, UH ᾱ’s boating program coordinator, and John Burns, associate professor of marine science.

A new 38-foot teaching and research vessel has arrived in Hilo, giving marine science students at the University of 鶹ý at Hilo a powerful new ocean laboratory.

The aluminum workboat, named Kaiola, meaning “living sea,” arrived from Oregon in February. It is now in final outfitting and inspection before heading into the water.

aluminum workboat
The aluminum workboat named Kaiola.

“The new marine science vessel is a 38-foot North River Sounder, a class of aluminum workboat designed specifically for scientific, environmental monitoring, and coastal operations in high-energy conditions,” said John Burns, associate professor and chair of the .

Burns said the team chose the vessel for its stability and flexibility.

“We selected this platform because it provides a stable, shallow-draft, highly maneuverable work deck suitable for diving, instrument deployment, and nearshore research around 鶹ý Island,” Burns said.

The hull is made of welded marine-grade aluminum. Burns explains that aluminum boats are ideal for research. They resist corrosion in saltwater. They are lighter than fiberglass but just as strong. They can handle beach landings, heavy equipment and constant use.

“This durability is critical for a teaching and research vessel that will operate year-round in dynamic coastal conditions and remote locations,” he said.

The large open deck allows crews to deploy water and sediment samplers, underwater cameras, sensors and mapping tools. Inside, the cabin supports navigation, computing and real-time data processing.

Hands-on experience

For students, the impact is immediate. The vessel provides access to sites that were once difficult or unsafe to reach and offers more hands-on experience with real research equipment, data collection and marine operations which are core skills for careers in marine science and ocean stewardship.

By Susan Enright

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鶹ýHilo to lead $1.2M NASA grant for coastal research /news/2026/02/24/nasa-grant-for-coastal-research/ Tue, 24 Feb 2026 20:43:30 +0000 /news/?p=229921 The grant aims to enhance understanding of how Ჹɲʻ’s coastlines can withstand climate change while boosting research and workforce development for UH students.

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Hawaii coastline
A measurement marker is visible in the upper left. Aerial images help map seasonal high-water events along the coast. (Credit: Haunani Kane)

The University of 鶹ý at Hilo will lead a new $1.2 million, three-year grant funded by NASA to better understand how Ჹɲʻ’s coastlines can withstand climate change while expanding hands-on research and workforce development opportunities for students across the 10-campus UH System.

John Burns, an associate professor of will co-lead the project with Haunani Kane, assistant professor of at the UH ԴDz .

“We are very excited to connect students from across the UH system through applied research experiences that help build educational pathways into careers in science and conservation,” said Burns.

The team will study how sea level rise and warming oceans are affecting coral reefs and nearshore areas. Students will learn satellite mapping, drone surveys, reef modeling and data analysis. They will also work with faculty, community partners and NASA scientists.

Burns directs UH ᾱ’s , where he creates detailed three-dimensional maps of reefs. Those maps show how storms, bleaching and human activity change reef structure and health over time.

—By Susan Enright

3 photos, students doing research
Students in the field conducting surveys. (Credit: John Burns)
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Global rankings recognize 鶹ýMānoa programs among world’s best /news/2026/01/21/times-subject-rankings-2026/ Wed, 21 Jan 2026 18:00:36 +0000 /news/?p=228476 UH Mānoa was ranked in all 11 of the 2026 Times Higher Education World University Rankings by Subject lists.

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U H Manoa students sitting at a desks

Five subject areas were placed in the world’s top 1%, and an additional four earned top 2% honors in the 2026 , released on January 21.

Education led the way, ranked in the No. 101–125 tier, followed by physical sciences at No. 126–150, arts and humanities at No. 151–175, and law and life sciences each at No. 201–250. To qualify in the world’s top 1%, rankings must be within the top 250 in the world () UH Mānoa was ranked in all 11 of the 2026 Times Higher Education World University Rankings by Subject lists.

“We are proud that UH Mānoa continues to be recognized globally, reflecting our commitment to academic excellence, research and the student experience,” UH Mānoa Interim Provost Vassilis L. Syrmos said. “These rankings underscore the hard work and dedication of our faculty, students and staff, who make UH Mānoa a truly exceptional place.”

All UH Mānoa rankings:

  • Education studies: No. 101–125
  • Physical sciences: No. 126–150
  • Arts and humanities: No. 151–175
  • Law: No. 201–250
  • Life sciences: No. 201–250
  • Social sciences: No. 251–300
  • Medical and health: No. 301–400
  • Psychology: No. 301–400
  • Business and economics: No. 401–500
  • Computer science: No. 501–600
  • Engineering: No. 501–600

Times Higher Education considers the following factors for its rankings: teaching, research environment, research quality, industry income and international outlook. Regarded as one of the leading national and international university rankings focused on research and academic excellence, Times Higher Education considered between 425–1,555 of the top institutions for each of its subject rankings, out of more than 25,000 institutions worldwide, to be eligible for its World University Rankings by Subject.

Other rankings

UH Mānoa also received these notable rankings:

For more information, .

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鶹ýcookiecutter shark research bridges ʻike Hawaiʻi, science /news/2025/12/30/cookiecutter-shark-research/ Wed, 31 Dec 2025 01:20:09 +0000 /news/?p=227751 The team developed a new Hawaiian name for the cookiecutter shark, nahunaiki, meaning “little bites.”

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Close-up of cookiecutter shark face
Cookiecutter shark

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.

Bite mark close-up
ʻAhi with cookiecutter shark bite mark

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!”

Several round cookiecutter shark bite marks on swordfish.
Swordfish covered in cookiecutter shark bite marks

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

Old Hawaiian language newspaper front page
Researchers sifted through Hawaiian language newspapers.

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.

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Hawaiʻi, Japan scientists deepen collaboration in marine, atmospheric science /news/2025/10/28/2025-joint-conference/ Tue, 28 Oct 2025 23:39:51 +0000 /news/?p=224498 The conference is designed to facilitate the exchange of research findings and provide opportunities for future collaboration and partnership.

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people at conference
Conference attendees connect and envision future collaborations at the poster session. (Photo credit: SOEST)

With a focus on marine and atmospheric sciences, researchers from the University of 鶹ý at Mānoa and University of Tokyo, Atmosphere and Ocean Research Institute (AORI) convened in Tokyo, Japan for a three-day conference in early October.

The 2025 Joint Conference on Ocean, Coastal, and Atmospheric Sciences, the fifth such joint event since 2008, is designed to facilitate the exchange of research findings and provide opportunities for future collaboration and partnership on grants, research and publications among participants.

group photo
Conference attendees gather for a photo. (Photo credit: SOEST)

“This long-standing collaboration between UH Mānoa and the University of Tokyo reflects the best of international science—grounded in trust, shared purpose, and a collective commitment to understanding and protecting our planet’s ocean and atmosphere,” said Darren Lerner, interim associate dean for research at the UH Mānoa (SOEST) and (鶹ý Sea Grant) director.

Sharing knowledge, expanding connections

Twenty faculty members, postdocs and graduate students from SOEST and other UH departments shared their latest work on marine debris and microplastics; changing ocean currents and climate; biology and ecology of sharks, coral, and deep-sea animals; sustainable aquaculture; and more. After two days of presentations, UH Mānoa participants were invited to visit AORI laboratories and field research activities related to their interests.

“Meeting with collaborators at AORI expanded my understanding of how processes that affect our home communities in 鶹ý—like ocean warming, deoxygenation, and changing climate cycles like El Niño–manifest in Japan’s coastal waters,” said Sara Kahanamoku-Meyer, SOEST assistant researcher and Early Career Research Fellow who participated in the conference.

The Joint Conference on Ocean, Coastal, and Atmospheric Sciences is aligned with an agreement between UH Mānoa and the University of Tokyo to encourage the exchange of faculty, scholars, students, academic information and materials for the benefit of both institutions and the participants. 鶹ý Sea Grant has been the lead coordinator of the conference and the facilitator of the related memorandum of understanding since 2007.

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鶹ýԴDz’s C-MORE Hale marks 15 years of world-class ocean science /news/2025/10/26/c-more-hale-15th-anniversary/ Sun, 26 Oct 2025 18:30:13 +0000 /news/?p=224274 Opened in 2010, the 26,997-square-foot facility has become a hub for groundbreaking research on marine microbes.

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large building
C-MORE Hale

The University of 鶹ý at Mānoa’s celebrated its 15th anniversary on October 25, marking a decade and a half of cutting-edge discovery and sustainable design.

Opened in 2010, the 26,997-square-foot facility has become a hub for groundbreaking research on marine microbes—organisms that play a vital role in the health of the planet’s oceans and climate. The state-of-the-art building houses laboratories, offices and a conference center designed to foster collaboration among scientists across disciplines and time zones. Its 50-seat auditorium supports video conferencing and live webcasting, connecting researchers around the world.

In 2012, C-MORE Hale was the first research laboratory building in 鶹ý to achieve LEED Platinum certification for environmental design. The facility incorporates energy-efficient systems and low-flow plumbing. It also features smart lighting controls and water recycling technologies that reduce potable water use by nearly half. The building’s innovative design earned multiple awards, including the Kukulu Hale Award for new commercial projects in 2011.

Leading research in microbial oceanography

David Karl
David Karl

David M. Karl, C-MORE’s founding director, member of the National Academy of Sciences and a professor of at UH Mānoa, was instrumental in securing the 10-year, $36.8 million National Science Foundation (NSF) grant in 2006 that led to its establishment as an NSF Science and Technology Center. The center unites specialists in biology, chemistry, oceanography and engineering from six partner institutions. Together, these teams investigate the structure, diversity and metabolic function of marine microbes—from those that use sunlight to generate energy to others that recycle organic matter and drive global nutrient cycles.

Beyond the facility itself, Karl and C-MORE have positioned UH Mānoa as a global leader in microbial oceanography by successfully establishing a link between molecular-level biology and large-scale ocean processes. His pioneering research on marine microbes and their role in global biogeochemical cycles has shaped modern understanding of how ocean life regulates Earth’s climate. Today, Karl continues to play a key role in advancing microbial oceanography worldwide.

“The opportunities that have been sustained by the investment in C-MORE Hale have put 鶹ý on the map of ocean research,” Karl said. “UH is now recognized as one of the top institutions in the world to study microbial oceanography, and we are also training the next generation of leaders. The future is today.”

Modeling the future of Earth’s oceans

people working and doing research on a ship

C-MORE’s integrated research program is organized around four themes: microbial biodiversity, metabolism and nutrient flow, remote and continuous sensing of ocean processes, and ecosystem modeling and prediction. This approach allows scientists to explore how marine microorganisms influence climate, carbon storage and energy transfer within ocean ecosystems. The center’s work has advanced predictive models of how marine environments respond to environmental change, establishing UH Mānoa as a key contributor to global ocean science.

C-MORE Hale encompasses all the success in microbial oceanography and David Karl is the founder for microbial oceanography,” UH Mānoa Interim Provost Vassilis L. Syrmos said. “He has brought funding—tens of millions of dollars to support this from the National Science Foundation, from the Moore Foundation, so private, public, federal, state, you name it. It is an unbelievable project. He has created a program that is second to none, not only here in 鶹ý and in the continent, but in the world.”

Karl was instrumental in the establishment of an open ocean time-series, called the 鶹ý Ocean Time-Series, as a sentinel for observing the effects of climate on the structure and function of microbial communities. C-MORE’s long-term research station, , located about 60 miles north of Oʻahu, was designated a Milestones in Microbiology Site by the American Society for Microbiology in 2015. The recognition honored UH’s historic contributions to understanding marine microbial life and its role in maintaining planetary habitability.

Building 鶹ý’s future in ocean science

person doing research in a lab

In addition to its research mission, C-MORE supports education and outreach programs that inspire future ocean scientists and engage the public in microbial ecology. These efforts span from pre-college curricula and teacher training to graduate and postdoctoral research opportunities, helping to strengthen the next generation of oceanographers.

C-MORE Hale’s naming under the Daniel K. Inouye Legacy Program honors the late senator’s lifelong commitment to advancing science and education in 鶹ý.

During C-MORE Hale’s 15th anniversary, many students and staff are aboard the R/V Kilo Moana, a 186-foot UH Mānoa research vessel that supports the center’s oceanographic missions by serving as a mobile platform for sampling, experiments and data collection at sea. Karl said a formal celebration to mark the milestone is planned for later this fall.

divers in the ocean

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鶹ýHilo, Keaukaha celebrate coral restoration at Puhi Bay /news/2025/08/19/uh-hilo-coral-restoration-puhi-bay/ Wed, 20 Aug 2025 01:36:24 +0000 /news/?p=220460 ūʻ Kani ʻĀԲ brought together Keaukaha community members and UH Hilo faculty and students to highlight UH ᾱ’s Coral Nursery.

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Attendees gather to learn about coral restoration at UH ᾱ’s PACRC. (Photo credit: Hunter Marion)

The and the Keaukaha Community Association hosted the welcome event, He ūʻ Kani ʻĀԲ, on August 2, at the university’s (PACRC) in Keaukaha, Hilo Bay.

The event brought together Keaukaha community members and ʻohana, UH Hilo faculty and student researchers, and local organizations to highlight the collaborative work being done at the center’s .

Group photo in front of "coral nursery" banner
UH Hilo volunteers. (Photo credit: Hunter Marion)

The nursery has three main facilities: a lab with 21 flow-through tanks, an invertebrate pool, and four horse troughs used to house corals and run projects. UH Hilo students are eligible to volunteer at the nursery during the semester.

“We hope this event strengthens relationships and fosters new collaborations across the community,” said event co-sponsor Steve Doo, a UH Hilo assistant professor of who coral and coral reefs.

Ocean stewardship

People snorkeling
Participants outplant coral in Puhi Bay. (Photo credit: Hunter Marion)

About 100 visitors from the community — from keiki to mākua (parents) to kūpuna (elders) — enjoyed the information booths, arts and crafts, land-based coral restoration demonstrations, snorkel surveys and coral outplanting in the bay.

Kaʻaka Swain, president of who also teaches at Ka ʻUmeke ʻ charter school, said the event welcomed the Keaukaha community into PACRC to experience ongoing marine research through hands-on, culturally grounded activities.

“From limu pressing and lauhala fish weaving to touch tanks, coral reef building, and out-planting coral in Puhi Bay, participants explored the connections between culture and science,” said Swain. “Keiki gained a deeper understanding of marine life and a sense of pride in caring for the ocean.”

By Susan Enright

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Unprecedented acidification ahead for corals in Hawaiʻi waters /news/2025/07/14/unprecedented-acidification-hawaii-waters/ Mon, 14 Jul 2025 17:46:30 +0000 /news/?p=218591 A UH Manoa study warns that Hawaiian waters could face levels of ocean acidification not seen in thousands of years.

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corals in the water

Across the globe, oceans are acidifying as they absorb carbon dioxide from the atmosphere, threatening coral reefs and many other marine organisms. , led by oceanographers at the University of 鶹ý at ԴDz, revealed that unprecedented levels of ocean acidification are expected around the main Hawaiian Islands within the next three decades.

coral
(Photo credit: Andre Seale)

Increased ocean acidification has the potential to harm marine life by weakening the shells and skeletons of organisms such as corals and clams, amplifying the effects of existing stressors, and threatening ocean-based ecosystems. However, researchers have hope, as some organisms have shown signs of adapting to the changing waters. The study helps researchers, conservationists and policymakers understand the future challenges facing 鶹ý’s coral reefs and provides information for preserving these critical ecosystems for future generations.

Researchers within the laboratory group of Brian Powell, professor in the at the UH ԴDz (SOEST), used advanced, fine-scale computer models to project how ocean chemistry around the main Hawaiian Islands might change over the 21st century under different climate scenarios based on how much carbon dioxide societies continue to emit.

“We found that ocean acidification is projected to increase significantly in the surface waters around the main Hawaiian Islands, even if carbon emissions flatline by mid-century in the low emission scenario,” said Lucia Hošeková, lead author of the paper and research scientist in SOEST. “In all nearshore areas these increases will be unprecedented compared to what reef organisms have experienced in many thousands of years.”

Emissions shape coral reef future

The extent and timing of these changes vary depending on the amount of carbon added to the atmosphere. In the high‐emission scenario, the team found that ocean chemistry will become dramatically different from what corals have experienced historically, potentially posing challenges to their ability to adapt. Even in the low‐emission scenario, some changes are inevitable, but they are less extreme and occur more gradually.

The team calculated the difference between projected ocean acidification and acidification that corals in a given location have experienced in recent history. They refer to this as ‘novelty’ and discovered that various areas of the Hawaiian Islands may experience acidification differently. Windward coastlines consistently exhibited higher novelty, that is, future conditions deviate more dramatically from what coral reefs have experienced in recent history.

“We did not expect future levels of ocean acidification to be so far outside the envelope of natural variations in ocean chemistry that an ecosystem is used to,” said Tobias Friedrich, study co-author and research scientist in the Department of Oceanography. “This is the first ocean acidification projection specifically for Hawaiian waters to document that.”

Corals potential to adapt

Previous studies have shown that a coral that is exposed to slightly elevated ocean acidity can acclimatize to those conditions, thereby enhancing the coral’s adaptability.

“The results show the potential conditions of acidification that corals may experience; however, the extremity of the conditions varies based on the climate scenario that the world follows. In the best case, corals will be impacted, but it could be manageable. This is why we continue new research to examine the combined effects of stresses on corals,” said Powell. “This study is a big first step to examine the totality of changes that will impact corals and other marine organisms and how it varies around the islands.”

The research team will continue to investigate the future changes in Hawaiian waters, specifically, heat stress, locations of possible refugia (areas where corals may be more sheltered from stress) for coral reefs, and changes to 鶹ý’s fisheries.

—By Marcie Grabowski

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