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Limnology and Oceanography e-Lectures

Bidle, Kay D. 2010. Phytoplankton-Bacteria Interactions:Ectohydrolytic Enzymes and Their Influence on Biogeochemical Cycling.

Limnol. Oceanogr. e-Lectures, doi:10.4319/lol.2010.kbidle.4

Phytoplankton-Bacteria Interactions:Ectohydrolytic Enzymes and Their Influence on Biogeochemical Cycling

Kay D. Bidle
Institute of Marine and Coastal Sciences
Rutgers University
New Jersey, USA

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This lecture is designed to acquaint the viewer with the importance of small-scale phytoplankton-bacteria interactions to upper ocean biogeochemistry. Specific attention is placed on the role of the microbial loop as a major carbon flux pathway. The primary focus is on the role of membrane-bound ectohydrolytic enzymes, particularly ectoproteases, as a fundamental biochemical strategy employed by marine bacteria to degrade or ‘process’ phytoplankton organic matter. In doing so, these small-scale biochemical processes exert a profound influence on the biogeochemical cycling of a variety of elements in the upper ocean.

Kay D. Bidle

Kay D. Bidle is an Assistant Professor at the Institute of Marine and Coastal Sciences, Rutgers University. He uses genome-enabled molecular biology and biochemistry approaches to investigate cellular responses of phytoplankton to physiological stress and viral infection, as mechanisms of mortality and bloom termination, as well as the diversity of bacterial ectohydrolytic enzymes. Kay won the 2005 Raymond A. Lindeman Award for his graduate work at the Scripps Institution of Oceanography in La Jolla, California, examining the biogeochemical consequences of small-scale interactions between marine bacteria and diatoms. His ASLO web lecture is an expanded version of a plenary talk at ASLO’s 2005 summer meeting in Santiago de Compostela, Spain.