Month: February 2026

Winter 2026 Departmental Achievements

Posted on February 10, 2026February 16, 2026 by Hannes Baumann

Awards:

Professor Pieter Visscher

Prof. Visscher received a Distinguished Career Award from The Geological Society of America. Over a distinguished career spanning more than three decades, Dr. Visscher has led advances in our understanding of the complex interactions between microbial communities, biogeochemical cycles, and the formation of sedimentary structures, bridging microbiology and Earth system science. [Read the full citation and reply]

Professor Sandra Shumway

Prof. Shumway was honored as Foreign Fellow by the Korean Academy of Marine Science and became Honorary Life Member in the World Aquaculture Society.

PhD candidate Hannah Collins

Hannah received a Young Outstanding One Health Biology Researcher award from the FUCOBI Foundation of Ecuador for her work on the microbiomes of suspension-feeding bivalves.

PhD candidate Molly James

Mollys' music and science collaboration, Harmony of Nature, with South Korean pianist Sophy Chung and composer Maxwell Lu was recently featured in a Career Feature article in the magazine Nature. The project transforms environmental data and scientific concepts into classical music.

MSc student Anagha Payyambally

Anagha received the UConn@COP Fellowship and had the honor of attending the United Nations Framework Convention on Climate Change Conference of Parties in November 2025. She traveled to Brazil to observe the climate change negotiations process and meet environmental leaders. She wrote about her experiences in UConn Today.

Grants:

Professor Catherine Matassa

Prof. Matassa received a grant from the National Science Foundation to perform a series of manipulative field and lab experiments on organisms that live in the rocky intertidal zone of our coasts. The goal is to better understand how the risk of being eaten influences the behavior and physiology of prey organisms.

Collaborative Research: Intergenerational effects of predation risk and resource identity on rocky shores: consequences for populations, communities, and ecosystems. NSF $400,267

Professors Elizabeth Weidner & Shuwen Tan

Profs. Weidner and Tan received funding to study the impact of the Connecticut River on sediment transport and deposition in Long Island Sound. The goal of the project is to better understand how changing sediment deposition, due to extreme weather events, may impacts local shellfish beds and provide guidance for aquaculture management and restoration planning.

Mapping Sediment Transport and Deposition Risks to Shellfish Beds in the Tidally Modulated Connecticut River Plume. CT SeaGrant (2026-2028 OMNIBUS, $169,882)

Professors Hannes & Zofia Baumann

In collaboration with partners in Massachusetts, this new project will experimentally simulate electromagnetic fields as they are generated by undersea cables, for example those transporting electricity from offshore wind turbines, and then test their potential effects on the behavior and development of sand lance, a burying fish of great ecological importance in North-Atlantic waters.

Investigating the Impacts of Electromagnetic Interference (EMI) on Adult and Larval Sand Lance in Stellwagen Bank National Marine Sanctuary. Massachusetts Clean Energy Center $503,831

Professor Samantha Siedlecki

Prof. Siedlecki together with colleagues from NOAA and co-PIs from other US institutions received funding to improve forecasting and develop practical strategies—combining ocean science, industry input, and social research— to create a resilient, adaptive management framework for the Sea Scallop fishery , which is one of the most valuable in the United States (>$500 million per year). Although scallops have long been resilient, they are becoming more vulnerable as rising ocean temperatures and increasing acidity affect their growth and reproduction.

RVA-OA2025 Project Title: Collaborating with Fishing Communities to Adapt: Co-developing actionable strategies for Atlantic Sea Scallop fishing communities. NOAA, $1,133,554

Publications:

Professor Catherine Matassa

Matassa and recent PhD graduate Sean Ryan investigated how a species of seaweed (Fucus vesiculosus) defends itself from herbivorous snails (Littorina littorea) along its latitudinal range in the coastal northeast USA. Are northern seaweeds built tougher?

Ryan, S. and Matassa, C. Latitudinal variation in the constitutive and inducible defences of a canopy-forming rocky intertidal seaweed (2025) Functional Ecology, 2025, 39(12), 3718-3731

Professor David Lund

Lund and graduate student Monica Garity show that changes in ocean circulation and natural alkalinity enhancement played a key role in regulating atmospheric carbon dioxide in the recent geologic past. The research was featured in UConn Today

Garity, M., Lund, D., Jerris, H., and McBride, J. (2025) Progressively greater biological carbon storage in the deep Atlantic during glacial inception. Proceedings of the National Academy of Sciences 122, e2510171122

Professor Pieter Visscher

Visscher and colleagues show that instead of whiting events, visible with satellites, calcium carbonate precipitation is mediated in the upper layers of aquatic sediments, and continue there for several millenia. Results suggest a revision of CO2 removal through calcium carbonate precipitation.

Visscher, P.T. et al. (2026) A critical role of heterotrophic bacteria in early diagenesis of carbonates through exopolymer degradation and calcium release. The Depositional Record (16 January 2026)

Professor Heidi Dierssen

Dierssen contributed her expertise in remote sensing methods to new published guidelines for assessing seagrass coverage from areal and space observations. These guidelines help monitoring and assessment of seagrass ecosystems and inform the Kunming–Montreal Global Biodiversity Framework headline indicator “Extent of natural ecosystems”.

Duffy, J.E., ..., Dierssen, H.M., and 21 co-authors (2025) Measuring and Reporting on Seagrass as an Essential Ocean Variable for Science and Management. BioScience biaf199

Professor Hans Dam

A joint team from UConn Marine Sciences/Ecology and Evolution (Professors Dam, Finiguerra, Baumann, and former student James de Mayo) and the University of Vermont (Prof. Pespeni and former postdoc Reid Brennan) used experimental evolution on a marine copepod to show that genetic and epigenetic mechanisms underlie resilience to ocean warming and acidification.

Brennan, R.S., J.A. deMayo, M. Finiguerra, H. Baumann, H.G. Dam, and M. Pespeni (2025) Complementary genetic and epigenetic changes facilitate rapid adaptation to multiple global change stressors. Proceedings of the National Academy of Sciences, 122(29), e2422782122.

Prof. Dam was also part of a large international group recommending key steps to resolve the disconnect between empirical research and models using planktonic organism to simulate ecosystem responses to global change.

Flynn, K. J., ..., Dam, H. G., ... 30 other authors (2025) More realistic plankton simulation models will improve projections of ocean ecosystem responses to global change. Nature Ecology & Evolution, 1-9

Professor Senjie Lin

Prof. Lin published two books in July and August, 2025. "Ecological Genomics of Algae" (CRC Taylor & Francis, 406 pp.) provides an integrative framework linking algal genomes to ecological processes, evolutionary innovation, and environmental adaptation across diverse algal lineages.

"Harmful Algal Blooms: Environmental Factors and Molecular Mechanisms" (Elsevier Academic Press, 306 pp.) integrates environmental forcing with molecular, physiological, and genomic mechanisms to explain the dynamics and impacts of harmful algal blooms.

Professor Hannes Baumann

Baumann's research tested one possible explanation for the increase in black sea bass abundance in Long Island Sound, i.e., that the species may be able to overwinter now in our coastal waters.

Zavell, M.D., Mouland, E.P., Barnum, D.L., Matassa, C.M., Schultz, E.T., and Baumann, H. (2025) Can adult Black Sea Bass overwinter in Long Island Sound, USA? Marine and Coastal Fisheries 17:vtaf014

Professor Robert Mason

A new study showed that atmospheric oxidation of elemental mercury in the Arctic spring can occur over sea ice, not just over land

He, Y. and Mason, R.P. (2026) Direct evidence for sea-ice-driven atmospheric mercury depletion events in the Arctic marginal ice zone. Environmental Science & Technology. Published 1/26.

New laboratory experiments examined how methylmercury accumulates in a dinoflagellate that acquires food via other processes besides photosynthesis

Myer, P.K., Mason, R.P., Baumann, Z.A. (2025) Prey engulfment as the dominant pathway of MeHg uptake in a heterotrophic dinoflagellate. Marine Environmental Research 210:107348

Professor Elizabeth Weidner

Weidner describes novel technology in mapping underwater sea ice - a great summary of which can be found here.

Weidner, E. (2025) Measurements of broadband backscattering from the terminus of a tidewater glacier. J. Acoust. Soc. Am. 158, 504–514

Professor emeritus Peter Auster

Auster and colleagues at NOAA's Northeast Fisheries Science Center Milford Laboratory show that aquaculture gear can be important fish habitat in coastal waters.

Mercaldo-Allen, R. ..., Auster, P.J., ... (10 authors) (2025) Measures of habitat quality for black sea bass using oyster aquaculture cages. North American Journal of Aquaculture, 2025, 1–16.

Professor emerita Ann Bucklin

The MetaZooGene Intercalibration Experiment (MZG-ICE) was a global effort that confirmed the reliability, accuracy and validity of metabarcoding data for monitoring zooplankton biodiversity.

Blanco-Bercial, L., ... (22 authors), and Bucklin, A. (2026) MetaZooGene Intercalibration Experiment (MZG-ICE): Metabarcoding Marine Zooplankton Diversity of the Global Ocean. Mol Ecol Resources 26(1):e70090

Graduate student Paban Bhuyan

Bhuyan and Prof. Romero demonstrated that autonomous saildrones can accurately measure small-scale ocean currents and their changes across space.

Bhuyan, P., Rocha, C.B., Romero, L., and Farrar, J.T. (2026) Acoustic Doppler Current Profiler Measurements from Saildrones, with Applications to Submesoscale Studies. Journal of Atmospheric and Oceanic Technology, e240114

Graduate student Hannah Collins

Collins performed experiments showing how two common species of freshwater mussels selectively ingest or reject microplastics.

Collins, H.I., Olatunji, P.O., Holohan, B.A., Shor, L.M., and Ward, J.E. (2025) Size-based ingestion of microspheres and microfibers by two freshwater mussel species (Dreissena bugensis and Elliptio complanata): Implications for removal of microplastic particles from aquatic systems. Journal of Shellfish Research 44:309-321.

Graduate student Halle Berger

Berger coupled a bioenergetic with a regional ocean model, predicting that warming initially enhances Atlantic sea scallop growth, but by 2100 scallops grow faster yet reach smaller sizes due to the combined effects of acidification and warming.

Berger, H. M., Siedlecki, S. A., Meseck, S. L., Pousse, E., Hart, D. R., Soares, F., Chute, A., & Matassa, C. M. (2026) Modeling the spatiotemporal effects of ocean acidification and warming on Atlantic sea scallop growth to guide adaptive fisheries management. Ecological Modelling 513:111434

DMS Prof. Pieter Visscher honored with GSA Career Award

Posted on February 5, 2026February 9, 2026 by Hannes Baumann

Please join us in congratulating Prof. Pieter Visscher for receiving the Geological Society of America’s 2025 Distinguished Career Award (sponsored by the Geobiology and Geomicrobiology Division).

Pieter is honored for his decade-long involvement in an NSF-sponsored project that has worked with undergraduate students studying microbial sediments in Puerto Rico. Between 2000 and 2011, Pieter brought 68 of these students to Avery Point for a two-week geomicrobiology short course. None of these first-generation college students had visited the continental US before. His continued encouragement inspired over 60 students in this program to pursue graduate degrees in the US. He taught this course twice in France, once in Argentina, and once in Chile.

Pieter is further commended for his pioneering Astrobiology work, pursuing the fundamental questions: Where are we coming from, where are we going, and what is our future? His tireless curiosity ultimately led to the establishment of NASA’s Astrobiology Institute (NAI) in 1998; the product of a four-decade-long collaboration with scholars, scientists, and engineers from around the country.

We asked Pieter to name a key paper from the many published in his career - he chose his 2020 study of arsenotrophic microbial mats that allow inferring our past:

Visscher P.T., K.L. Gallagher, A. Bouton, M.E. Farias, D. Kurth, B.P. Burns, M.R. Walter, M. Sancho-Tomas, P. Philippot, A. Somogyi, K. Medjoubi, E. Vennin, R. Bourillot, M. Contreras, C. Dupraz. 2020. Modern arsenotrophic microbial mats provide an analogue for life in the anoxic Archean. Nature Communications Earth & Environment 1:24

by Tracy Frank:

Pieter T. Visscher. Over a distinguished career spanning more than three decades, Dr. Visscher has led advances in our understanding of the complex interactions between microbial communities, biogeochemical cycles, and the formation of sedimentary structures, bridging microbiology and Earth system science. His pioneering studies of microbial mats and stromatolites across a range of settings have illuminated the role of microbes in shaping Earth’s surface environments through time, while his innovative approaches to microbial processes in modern and ancient settings have inspired new directions in research. His atmospheric biosignature studies were instrumental for NASA’s Astrobiology Institute, of which he was a co-founding member. A prolific scholar and respected mentor, Dr. Visscher has authored hundreds of influential publications and trained generations of graduate students who continue to advance the discipline worldwide. His research, collaborations, and leadership have had a transformative impact on geomicrobiology, leaving a legacy that will guide the science for decades to come.

Pieter: Thank you, Tracy, for your kind citation. I am honored to receive this recognition, which has been previously awarded to geochemists, paleontologists, sedimentologists, and geobiologists for whom I have great respect.

As many know, the term geobiology was coined by Lourens G.M. Baas Becking, but not in his monograph “Geobiologie”, published in 1934, but in his inaugural lecture at the University of Leiden on January 28, 1931, entitled “Gaia of leven en aarde”. In this lecture, Baas Becking observed a then recent change in natural and physical scientific research that for the first time were deployed jointly to understand our planet. Furthermore, he expanded his observation that chemistry, biology, and geology did not just apply to the understanding of our planet Earth but provided the foundation for understanding the universe, which he argued was fueled by cyclic events - notably chemical element cycles, but also (micro)biological metabolisms, and physical phenomena, the mutual impact of which was captured in geological time and space. In a way, this laid the groundwork for what, 65 years later, became a motivation for NASA’s Pale Blue Dot II meeting that, in turn, started Astrobiology. Baas Becking viewed geobiology as a Copernican-based science, in other words, perceived not from an anthropocentric, Earth-centric viewpoint, but from a geocentric one. What really matters is that geo(micro)biology is a transdisciplinary science, not just a multidisciplinary one. The answer to “big questions” in this discipline is best solved by first assessing which disciplinary tools are needed, not just by combining disciplinary views that address the question. Despite incredible advances in methodologies in the last four decades, each approach has its limitations. This is critical to remember.

My educational background is based on a combination of organic chemistry and the Delft School of Microbiology – that, in addition to Baas Backing, also included Beijerinck, Kluyver, and van Niel. In addition to having a great mentor, Hans van Gemerden, who combined detailed observations and measurements in the field with meaningful ecophysiological laboratory experiments, I have had the good fortune to meet many scientists who have shaped our discipline as we know it today. The list is quite exhaustive, but I would like to mention a handful of them here briefly, some unsung heroes in geomicrobiology, in chronological order.

Wolfgang Krumbein was instrumental during my PhD work on sulfur cycling at the University of Groningen. After a long 24 hours of fieldwork, being in a group that was the first to use microelectrodes in the field during diel cycles, a very tedious process at the time, he would sit me down in his cigar-smoke-filled office and question me about everything I had observed and was planning to do as follow-up. Early in my grad student years, he sent me a box with well over a hundred of his reprints. Using geology and microbiology, his strong belief that the laminae in stromatolites are the same as those in microbial mats may be wrong, but it nevertheless challenged our thinking and steered us in the right direction to better understand the role of microbes on early Earth and throughout geologic time. Spending three weeks with Dick Castenholz and Bev Pierson in Yellowstone was a life-changing event. The vast diversity of environments in a relatively small area was an eye-opener. Likewise, several long discussions, both in the field and during elegant home-cooked meals with Malcolm Walter, have contributed much to advancing my work. Lynn Margulis, who, by the way, together with James Lovelock reintroduced the term Gaia in 1974, 43 years after Baas Becking, Ed Leadbetter, Ron Oremland, Jack Farmer, and Dave DesMarais were all instrumental as post-doc and early career mentors. Generous scientists who gave selfless advice and listened. I learned a lot from them and expanded my scientific and interpersonal horizons. It takes a village….

I would like to thank the people who are keeping our field alive: the leaders of the professional societies, notably the Division of Geobiology and Geomicrobiology of Geological Society of America, the reviewers of our proposals and manuscripts, the program directors at funding agencies, the educators, who sparked the interest in students who then come as graduate assistants or post-docs to our labs, and all those students and colleagues with whom I had many fruitful/stimulating discussions and rewarding collaborations. I am excited about the direction in which our field is moving, and hope that we jointly continue to combine the many subdisciplines that make up geo(micro)biology in a meaningful way to unlock the secrets that our field holds in shaping our planet and the many worlds beyond.

Avery Point Spotlight: Jeff Godfrey

Posted on February 5, 2026February 10, 2026 by Hannes Baumann

By: Anne L. Gilewski

Officially, Jeff is an Academic Assistant at UConn's Marine Sciences Department, but if you’ve ever been lucky enough to interact with Jeff, you know he’s far more than that. Over his 26-year career directing dive operations, Jeff standardized a formal curriculum that includes course work for Open Water Dive and Scientific Diving training and certification. He also maintained all facilities and equipment, approved dive plans, and has been part of countless research projects that require dive operations.

Every superhero has an origin story, so we asked Jeff to share his!

Growing up in Utah, Jeff had three dream jobs in his mind: paleontologist, astronaut, or diver. After watching cartoons, Jeff would switch over to Sea Hunt, a 1958 program about the adventures of an ex-Navy frogman, starring a very handsome Lloyd Bridges. After that was The Undersea World of Jacques Cousteau, a series that often served as inspiration for future marine biologists—including Jeff.

Despite living in a landlocked state, diving found Jeff. During his senior year in high school, when he wasn’t racing motorcycles and boating, Jeff took a diving certification course after school class—a move he says was a good way to get out of chores. Though the impetus may have been to avoid milking the cows, that course set the stage for a lifelong passion.

Jeff set out to build up a collection of certifications, started snorkeling, free diving, and collecting daphnia and salamanders for local aquarium stores. At 24, he earned his Dive Instructor certification. In 1987, while earning his bachelor’s degree in Applied Biology from Utah State University, Jeff joined the Utah Fish & Wildlife Cooperative Research Unit as a Field Tech and Research Diver. Being a field diver is most decidedly not a desk job. A typical day might be ice diving in the Flaming Gorge reservoir, or monitoring trout habitat in the Green River, maybe even donning 90 extra pounds to face the white water of the Green River!

After graduation, Jeff accepted a position at the Marine Resources Development Center Underwater Foundation’s MarineLab program in Key Largo, FL. Jeff taught Marine Ecology to students of all ages, conducting lectures on seagrasses, marine algae, mangroves, coral reefs, astronomy, and marine invertebrates—to name a few. A chance phone call from Avery Point librarian Jan Heckman about an open Dive Safety Office position in a small Connecticut town piqued his interest. In 1999, Jeff and his family moved north, and the rest is history. (Thank you, Jan!)

Amongst all the diving Jeff had done, we had to know: What was the most memorable? (Spoiler alert! It was hard to choose).

“Blue water diving in Antarctica. To see that environment—icebergs, Deception, Palmer Station”, Australia, Hong Kong, China, American Samoa, and everywhere in the United States.” Jeff also had the opportunity to dive the USS Monitor and take part in a National Geographic survey in the Bahamas—diving to 430 feet!

We asked Jeff what it takes to be a DSO at a university. Here’s his advice:

DSOs facilitate dive operations to be done safely and efficiently. Jeff strongly believes in looking at universities that have a well-developed program. A STEM degree, with coursework in physics, chemistry, and biology, is a critical piece. A research DSO needs to have a solid science background to effectively communicate with investigators—graduate degrees are not uncommon in this field. Most importantly, spend a lot of time in the water. Diving is a tool; for a diver to be useful, they need to have extensive experience in a variety of conditions.

Any final thoughts?

Jeff is grateful to UConn for supporting his endeavors to increase technology for scientific diving here at Avery Point. His hope for the future? UConn continues to push students to take advantage of these advanced technologies in their academic pursuits.

Thank you, Jeff, for 26 years of service. We wish you the best in your retirement!

Marine Sciences