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Associate Director - Biology and Paleo Environment
Lamont-Doherty Earth Observatory
Biology and Paleo Environment
Adjunct Associate Professor
Earth and Environmental Sciences
Lamont Research Professor
Lamont-Doherty Earth Observatory
122 Marine Biology
61 Route 9W - PO Box 1000
(845) 365-8837
(845) 365-8150


Fields of interest: 
Plankton ecology, Phytoplankton growth and physiology, Zooplankton grazing, Harmful algae, Dinoflagellate blooms, Physical/biological interactions, Nutrient/microbial pollution of coastal waters, Sea-ice algae

As an aquatic ecologist and oceanographer, my research and teaching focus on how aquatic microorganisms and their predators interact with each other and their physical/chemical environment. I emphasize a holistic perspective encompassing the range of planktonic organisms found in coastal marine systems, estuaries, rivers and lakes, including: planktonic algae, protist microzooplankton, invertebrate zooplankton, and bacteria.    

My research approach links hypothesis-driven, controlled laboratory experiments with small-scale field manipulations and field observations. Such research is inherently interdisciplinary, connecting cell biology and physiology with ecology, and physics and chemistry of the environment. My work finds application in addressing basic and applied questions related to aquatic geochemical fluxes, harmful algal blooms, pollution and water quality, and sea ice ecology

Please see my website for more information.




List of degrees from highest to lowest:
Ph.D. - Biological Oceanography
Scripps Institution of Oceanography, University of California, San Diego
M. S. - Biological Oceanography
College of Oceanography, Oregon State University
B.S. - Zoology
University of Wisconsin, Madison

Lamont Projects:

Lamont/DEES Student List: 

Research Blogs:

Referenced in the Following News Items:

Featured in the Following Videos:

Selected Publications:

Overwintering of gelatinous zooplankton in the coastal arctic ocean Purcell, Jennifer E.; Juhl, Andrew R.; Mańko, Maciej K.; Aumack, Craig F. Marine Ecology Progress Series (2017)
Conserved transcriptional responses to nutrient stress in bloom-forming algae Harke, Matthew J; Juhl, Andrew R.; Haley, Sheean T.; Alexander, Harriet; Dyhrman, Sonya T. Frontiers in Microbiology (2017)
Transcriptional response of the harmful raphidophyte Heterosigma akashiwo to nitrate and phosphate stress Haley, Sheean T.; Alexander, Harriet; Juhl, Andrew R.; T. Dyhrman, Sonya T. Harmful Algae (2017)