Project Information
Collaborative Research: Physical Mechanisms Driving Food Web Focusing in Antarctic Biological Hotspots
Short Title:
Project SWARM
Start Date:
End Date:
Undersea canyons play disproportionately important roles as oceanic biological hotspots and are critical for our understanding of many coastal ecosystems. Canyon-associated biological hotspots have persisted for thousands of years Along the Western Antarctic Peninsula, despite significant climate variability. Observations of currents over Palmer Deep canyon, a representative hotspot along the Western Antarctic Peninsula, indicate that surface phytoplankton blooms enter and exit the local hotspot on scales of ~1-2 days. This time of residence is in conflict with the prevailing idea that canyon associated hotspots are primarily maintained by phytoplankton that are locally grown in association with these features by the upwelling of deep waters rich with nutrients that fuel the phytoplankton growth. Instead, the implication is that horizontal ocean circulation is likely more important to maintaining these biological hotspots than local upwelling through its physical concentrating effects. This project seeks to better resolve the factors that create and maintain focused areas of biological activity at canyons along the Western Antarctic Peninsula and create local foraging areas for marine mammals and birds. The project focus is in the analysis of the ocean transport and concentration mechanisms that sustain these biological hotspots, connecting oceanography to phytoplankton and krill, up through the food web to one of the resident predators, penguins. In addition, the research will engage with teachers from school districts serving underrepresented and underserved students by integrating the instructors and their students completely with the science team. Students will conduct their own research with the same data over the same time as researchers on the project. Revealing the fundamental mechanisms that sustain these known hotspots will significantly advance our understanding of the observed connection between submarine canyons and persistent penguin population hotspots over ecological time, and provide a new model for how Antarctic hotspots function.

To understand the physical mechanisms that support persistent hotspots along the Western Antarctic Peninsula (WAP), this project will integrate a modeling and field program that will target the processes responsible for transporting and concentrating phytoplankton and krill biomass to known penguin foraging locations. Within the Palmer Deep canyon, a representative hotspot, the team will deploy a High Frequency Radar (HFR) coastal surface current mapping network, uniquely equipped to identify the eddies and frontal regions that concentrate phytoplankton and krill. The field program, centered on surface features identified by the HFR, will include (i) a coordinated fleet of gliders to survey hydrography, chlorophyll fluorescence, optical backscatter, and active acoustics at the scale of the targeted convergent features; (ii) precise penguin tracking with GPS-linked satellite telemetry and time-depth recorders (TDRs); (iii) and weekly small boat surveys that adaptively target and track convergent features to measure phytoplankton, krill, and hydrography. A high resolution physical model will generalize our field measurements to other known hotspots along the WAP through simulation and determine which physical mechanisms lead to the maintenance of these hotspots. The project will also engage educators, students, and members of the general public in Antarctic research and data analysis with an education program that will advance teaching and learning as well as broadening participation of under-represented groups. This engagement includes professional development workshops, live connections to the public and classrooms, student research symposia, and program evaluation. Together the integrated research and engagement will advance our understanding of the role regional transport pathways and local depth dependent concentrating physical mechanisms play in sustaining these biological hotspots.

This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
Person Role
Bernard, Kim Investigator and contact
Oliver, Matthew Investigator and contact
Kohut, Josh Investigator
Fraser, William Investigator
Klinck, John M. Investigator
Gallagher, Katherine Researcher
Hann, Ashley Researcher
Statcewich, Hank Co-Investigator
Veatch, Jacquelyn Researcher
Dinniman, Michael Researcher
Antarctic Organisms and Ecosystems Award # 1745081
Antarctic Instrumentation and Support Award # 1745023
Antarctic Organisms and Ecosystems Award # 1745023
Antarctic Organisms and Ecosystems Award # 1745018
Antarctic Ocean and Atmospheric Sciences Award # 1745011
Antarctic Organisms and Ecosystems Award # 1745011
Antarctic Integrated System Science Award # 1745009
Antarctic Organisms and Ecosystems Award # 1745009
Antarctic Ocean and Atmospheric Sciences Award # 1744884
Antarctic Organisms and Ecosystems Award # 1744884
AMD - DIF Record(s)
Deployment Type
Palmer Station, Summer general deployment
Data Management Plan
Product Level:
0 (raw data)
Repository Title (link) Format(s) Status
BCO-DMO Antarctic ACROBAT data Not Provided exists
BCO-DMO CTD Data from IFCB Sampling CSV exist
BCO-DMO Finite Time Lyapunov Exponent Results, Calculated from High Frequency Radar Observed Surface Currents netCDF exist
BCO-DMO High Frequency Radar, Palmer Deep netCDF exist
BCO-DMO IFCB Image Data CSV exists
BCO-DMO Relative Particle Density netCDF exist
BCO-DMO SWARM AMLR moorings - acoustic data Not Provided exists
BCO-DMO WAP model float data netCDF exist
BCO-DMO Winds from Joubin and Wauwerman Islands CSV exist
IOOS Glider DAAC SWARM Glider Data near Palmer Deep Not Provided exists
  1. Gorman, Kristen B. and Ruck, Kate E. and Williams, Tony D. and Fraser, William R. (2021). Advancing the Sea Ice Hypothesis: Trophic Interactions Among Breeding Pygoscelis Penguins With Divergent Population Trends Throughout the Western Antarctic Peninsula. 8. Frontiers in Marine Science, 8. Published. 2296-7745. (doi:10.3389/fmars.2021.526092)
  2. Hudson, K., Oliver, M. J., Kohut, J., Cohen, J. H., Dinniman, M. S., Klinck, J. M., Reiss, C. S., Cutter, G. R., Statscewich, H., Bernard, K. S., & Fraser, W. (2022). Subsurface Eddy Facilitates Retention of Simulated Diel Vertical Migrators in a Biological Hotspot. Journal of Geophysical Research: Oceans, 127(5). Portico. (doi:10.1029/2021jc017482)
  3. Veatch, J., Kohut, J., Fredj, E., & Oliver, M. (2023). High Frequency Radars Observe Krill Feeding: Using Lagrangian Coherent Structures to Detect Food Web Focusing. OCEANS 2023 - MTS/IEEE U.S. Gulf Coast. (doi:10.23919/oceans52994.2023.10337046)
  4. Trinh, Rebecca and Ducklow, Hugh W. and Steinberg, Deborah K. and Fraser, William R. (2023). Krill body size drives particulate organic carbon export in West Antarctica. 618. (7965). Nature, 618. Published. 0028-0836. (doi:10.1038/s41586-023-06041-4)
  5. Hann, A. M., Bernard, K. S., Kohut, J., Oliver, M. J., and Statscewich, H. (2023) New insight into Salpa thompsoni distribution via glider-borne acoustics. Frontiers in Marine Science, 9, 10.3389/fmars.2022.857560 (doi:10.3389/fmars.2022.857560)
  6. Veatch, J. M., Kohut, J. T., Oliver, M. J., Statscewich, H., & Fredj, E. (2024). Quantifying the role of submesoscale Lagrangian transport features in the concentration of phytoplankton in a coastal system. ICES Journal of Marine Science. (doi:10.1093/icesjms/fsae036)

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