Seminars

Coupling and decoupling between upwelling and biological response in Eastern Boundary Upwelling Systems

Eastern Boundary Upwelling Systems support productive marine ecosystems fueled by coastal upwelling, which supplies nutrients into the ocean sunlit surface layer. However, upwelling and biology can become decoupled due to the combined effects of biology-mediated temporal lags and/or persistence, and horizontal advection by surface currents. This decoupling makes it challenging to identify how upwelling drives biological patterns and requires searching beyond conventional correlation analysis. In this talk, I will show how we can uncover the link between upwelling and biological response, including plankton, carbon export, and deep-sea animals, by using minimalistic mechanistic models. I will also present how the knowledge gained can be used to predict upwelling-driven biological changes across broad spatial regions.

Dr. Monique Messié

Monique Messié is a biological oceanographer who integrates data from different disciplines (from physics to ecosystems), different instruments (from AUVs to satellites), and different regions (from Monterey Bay to global) to study ecosystem processes and physical/biological interactions in both coastal regions and open oceans. She analyzes data using statistical and machine learning techniques to investigate relationships between physics and biology in the ocean, and tests them using mathematical models. She is a Senior Research Specialist at the Monterey Bay Aquarium Research Institute (MBARI) following a PhD at Paul Sabatier University (Toulouse, France) and MSc from Ecole Centrale Paris and Pierre and Marie Curie University (Paris, France).

Seminar – New biologging approaches for studying marine species and ecosystems

September 30, 2025October 31, 2025Ronja Steinbach

New biologging approaches for studying marine species and ecosystems

Biologging approaches, or the use of animal-borne electronic tags for logging and/or relaying of biological and environmental data, are advancing at a rapid pace, providing new ways for studying marine species and their environment. Our research group, the Trophic and Spatial Ecology Research Lab (TRASER) at the University of Delaware, is working to advance biologging technology to improve our ability to obtain in situ data on the behavior, physiology, and habitats of mobile marine species to improve our understanding of their ecology as well as foster improved management of marine ecosystems in a rapidly changing ocean. In this seminar, I will provide an overview of our research in developing the use of sharks as ocean observing platforms that will improve our ability to obtain near-real time oceanographic data from these highly mobile species, improving the type and scale of data available to various oceanographic models. I will also discuss our ongoing effort to integrate biologging tags with lab-derived estimates of physiological parameters with high resolution behavioral and environmental data to understand how the physiology of an organism interacts with the environment to influence its distribution and ecology across spatial and temporal scales.

Dr. Aaron Carlisle

Dr. Carlisle is an Associate Professor in the School of Marine Science and Policy at the University of Delaware. His lab's research focuses on how the abiotic and biotic environment and organismal biology interact to influence the behavior, distribution and ecology of species, and how these interactions impact their population dynamics, life history strategies, and ecosystem roles.We use a variety of approaches and technologies, such as stable isotope analysis and biologging, combined in new ways to provide unique insights into marine species. Dr. Carlisle is a graduate of Stanford University (Ph.D.), Moss Landing Marine Laboratories (M.S.), and Princeton University (A.B.).

Seminar – The (Real) Geologic History of the Stanislaus Table Mountains and Yosemite Valley

September 23, 2025October 3, 2025Ronja Steinbach

The (Real) Geologic History of the Stanislaus Table Mountains and Yosemite Valley

In 1865, J.D. Whitney published a hypothesis, originally proposed by his colleague Ian Brewer, that the Stanislaus Table Mountains were a form of ‘inverted topography.’ According to this theory, a 10-million year old lava flow had travelled down a mountain canyon and solidified along the river bed. Over time, the adjacent valley walls had eroded down, transforming the lava-capped river bed into a series of ridges that are now recognized as the table mountains. Furthermore, Whitney reasoned that this much erosion could only have been accomplished as a result of tilting and uplift of the Sierra Nevada. Whitney’s explanation was the genesis for the dominant theory that the Sierra Nevada is a relatively young range, having popped up only in the past 5-10 million years. Similarly, the initial formation of Yosemite Valley has also been attributed to recent uplift. In my talk, I will present evidence demonstrating that the Stanislaus River watershed has not undergone any dramatic transformations and that, instead, it looks very much like it did 30-40 million years ago. In addition, I will present evidence showing that Yosemite Valley was initially cut by a river draining a large volcanic plain that once buried the crest of the northern Sierra. Both of these studies, as well as others, contribute to a growing body of evidence that the Sierra Nevada is an ancient range, rising up at least ~40 million years ago.

Dr. Manny Gabet

I’m a geomorphologist, which means I study how landscapes evolve over time. Some of my past research has focused on erosion in the Himalayas, the role of fires in triggering debris flows in Montana, and the mechanics of landslides. More recently, I’ve been investigating the geologic history of the Sierra Nevada over the past 40 million years and have been discovering that the dominant theory on the age of the mountain range is not supported by the evidence.

Seminar – Ocean fronts, eddies, and internal waves in numerical models and SWOT

September 19, 2025September 24, 2025Amadeo Scott

Ocean fronts, eddies, and internal waves in numerical models and SWOT

The ocean is the climate's largest reservoir of heat, freshwater, and carbon. Therefore, in order to understand and predict the impact of natural and anthropogenic perturbations on the climate system, we need to understand and predict the exchange of heat, freshwater, carbon, and other properties between the global ocean and the atmosphere. The driving hypothesis of my talk is that submesoscale ocean motions (<50 km), both balanced and unbalanced, play a key role in air-sea exchanges and vertical property transports in the ocean. To evaluate this hypothesis, we can use a set of tools that have become available during the past decade, namely (1) submesoscale and internal-wave admitting global-ocean simulations and (2) observations obtained by the Surface Water and Ocean Topography (SWOT) mission, which recently completed the second of its 3-year science orbit. I will describe some completed and ongoing studies that are using the aforementioned tools to study the impact of submesoscales on ocean circulation and climate.

Dr. Dimitris Menemenlis

Dr. Dimitris Menemenlis is the most recent hire of the MLML Ocean Modeling Lab. He first fell in love with programming while playing with an HP-25C as a teenager growing up in Montreal. Although an acoustical oceanographer by training, by sharing an office at MIT with Chris Hill and Stephanie Dutkiewicz during his PostDoc years, he became one of the early adopters of the Massachusetts Institute of Technology general circulation model (MITgcm), a key contributor to the Estimating the Circulation and Climate of the Ocean (ECCO) project, and always a very big fan of the MIT Darwin Project. He is joining Drs. Carroll and Savelli at MLML in order to help take the open-source, data-constrained ECCO-Darwin global-ocean general circulation and biogeochemistry model to the next level!

Seminar – Beyond simple models of (marine) species on the move

September 9, 2025September 30, 2025Olivia Beaudoin

Beyond simple models of (marine) species on the move

Why are species found where they are and not elsewhere? What makes them move? Research in the Fredston Lab focuses on the fundamental drivers of species’ ranges, and the causes and consequences of climate-related range shifts. This talk will cover evidence for temperature driving the biogeography and abundance of demersal fishes across spatial and temporal scales; a range of projects aimed at disentangling multiple drivers of species’ ranges, with various methods and taxa; and methods and theory for understanding species on the move.

Dr. Alexa Fredston

Alexa Fredston is a quantitative marine ecologist who uses a range of statistical and theoretical methods and all the ocean data she can find to (hopefully) advance foundational ecology, biodiversity conservation, and human well-being. She is an Assistant Professor in the Department of Ocean Sciences at the University of California, Santa Cruz. Dr. Fredston earned her PhD from the Bren School of Environmental Science and Management at the University of California, Santa Barbara in 2020, and graduated summa cum laude from Princeton University with a B.A. in Ecology and Evolutionary Biology in 2012.

Seminar – The ecology of kelp forests in a changing ocean: physiology, microbiomes & carbon cycling

May 9, 2025May 22, 2025Haylee Bregoff

The ecology of kelp forests in a changing ocean: physiology, microbiomes & carbon cycling

Climate change is threatening kelp forests, with 40-60% of kelp forests in decline globally. My research has identified critical temperature thresholds for growth, survival, and reproduction across the life cycle of bull kelp, Nereocystis luetkeana. Kelp blades harbor abundant and diverse microbial communities, which are also impacted by ocean warming. We will dive into the world of kelp microbiomes, looking at the factors that shape the assembly and composition, micron-scale spatial structure, and functional role of the kelp microbiome. Finally, kelp play an important role in the global carbon cycle by creating highly productive underwater forests that contribute to carbon sequestration – we will discuss key knowledge gaps in our understanding of carbon cycling in kelp forests.

Dr. Brooke Weigel

Dr. Brooke Weigel is an Assistant Professor of Oceans at Stanford University, based at Hopkins Marine Station. Previously, she was a Kelp Conservation Postdoctoral Researcher at the University of Washington’s Friday Harbor Labs and a National Science Foundation Postdoctoral Fellow at Western Washington University. Brooke has been working in kelp forest ecosystems for almost 10 years. Brooke received her PhD from the University of Chicago, where she studied kelp forest ecology on Tatoosh Island, Washington.

Seminar – The effects of environmental change on the importance of non-consumptive predator effects in the rocky intertidal zone

May 2, 2025May 8, 2025Amadeo Scott

The effects of environmental change on the importance of non-consumptive predator effects in the rocky intertidal zone

Prior to the 1990s, most ecological theory viewed predator–prey interactions from the simple perspective of predators consuming their prey. In recent decades, ecologists have amassed evidence showing that prey respond to the threat of predation by changing their behaviors, morphologies, and life histories. These non-consumptive effects (NCEs) of predators may act in concert with the direct consumption of prey to influence prey abundance and community dynamics. Yet, we have only scratched the surface of this active and fascinating field. Despite all the excellent research in this area, some significant questions remain unanswered, including: “How important are NCEs relative to consumptive effects in predator– prey interactions?”; “How are properties of predators used by prey to encode threat?”; and “How does the environment affect predator detection and subsequent NCEs”?. My students and I have used experimental approaches in the lab and field to assess the potential for strong NCEs in the rocky intertidal zone and what factors or environments produce strong versus weak NCEs.

Dr. Paul Bourdeau

Dr. Paul Bourdeau is an Associate Professor of Marine Biology and Ecology at Cal Poly Humboldt, where he also serves as the Graduate Coordinator for the Department of Biological Sciences and the interim director of the Telonicher Marine Laboratory. A native of southeastern Massachusetts, Dr. Bourdeau earned his BS in Biology and MS in Marine Biology from the University of Massachusetts Dartmouth, followed by a PhD in Ecology and Evolution from Stony Brook University. He conducted postdoctoral research at Michigan State University before joining Humboldt in 2014. Dr. Bourdeau’s lab’s research focuses on how marine organisms respond to environmental changes, particularly those induced by human activities, such as the introduction of non-native species and climate change.

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Seminar Presented by Dr. Gerick Bergsma

Seminar presented by Professor Don Croll

Seminar presented by Dr. Ilana-Berman Frank

"Getting through together… Sociality in cyanobacteria: (The case of Trichodesmium)"

January 27th at 12:00 pm

Seminar – New biologging approaches for studying marine species and ecosystems

Seminar – The (Real) Geologic History of the Stanislaus Table Mountains and Yosemite Valley

Seminar – Ocean fronts, eddies, and internal waves in numerical models and SWOT

Seminar – Beyond simple models of (marine) species on the move

Seminar – The ecology of kelp forests in a changing ocean: physiology, microbiomes & carbon cycling

Seminar – The effects of environmental change on the importance of non-consumptive predator effects in the rocky intertidal zone

Dr. Paul Bourdeau | California State Polytechnic University, Humboldt

Presenting: "The effects of environmental change on the importance of non-consumptive predator effects in the rocky intertidal zone"

Hosted by the Invertebrate Ecology Lab

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