During the summer of 1985 students and senior faculty who participated in the HIMB Summer Studies Program utilized a variety of experimental techniques to study nutrient and energy cycling among phytoplankton, bacteria, and zooplankton. Bacterial production rates were found to vary by more than an order of magnitude between different locations in the bay and HIMB lagoon, with most of the production being due to free-living (not-particle bound) bacteria. Use of metabolic inhibitors indicated that bacteria played an important role in both the uptake and regeneration of phosphate, and that phytoplankton were by no means the only important consumers of phosphate. Fifty percent or more of phytoplankton photosynthetic rates was due to picoplankton (0.2-2 microns). The productivity/biomass ratio for the phytoplankton community was consistent with recent studies which have indicated that the cells are growing rapidly with little reduction in growth rate due to nutrient limitation. A new technique for estimating zooplankton grazing rates using fluorescent microspheres yielded results in excellent agreement with known grazing rates measured in a continuous culture system. Use of bacteria uniformly labeled with carbon-14 was found to be a promising technique for estimating bacteriovore grazing rates and assimililation efficiencies. Studies of the benthic diatom Nitzschia graeffei indicated that 6-40% of the carbon assimilated by this organism was obtained via photoheterotrophy.
|Dr. Farooq Azam, Institute of Marine Resources, Scripps Institution of Oceanography, USA|
|Dr. Paul Bienfang, Oceanic Institute, USA|
|Dr. Paul Falkowski, Brookhaven National Laboratory, USA|
|Dr. William Harrison, Bedford Institute of Oceanography, Canada|
|Dr. David Karl, University of Hawaii, Manoa, USA|
|Dr. Edward Laws, Hawaii Institute of Marine Biology, University of Hawaii, Manoa, USA|
|Dr. Ian Morris, Center for Environmental and Estuarine Studies, University of Maryland, USA|
|Dr. Michael Mullin, Institute of Marine Resources, Scripps Institution of Oceanography, USA|
|Dr. Michael Pace, University of Hawaii, Manoa, USA|
|Dr. Satoru Taguchi, Hawaii Institute of Marine Biology, University of Hawaii, Manoa, USA|
|note: lead faculty in bold|
|Megan Bailiff, University of Hawaii, Manoa, USA|
|Betsy Chronic, University of Alaska, USA|
|Darrell Fox, University of Hawaii, Manoa, USA|
|Adrienne Gaedeke, University of Constance, Germany|
|Paul Haberstroh, University of Washington, USA|
|Margaret Murphy, Harvard University, USA|
|Michelle Nawrocki, University of Hawaii, Manoa, USA|
|Cynthia Tynan, University of Rhode Island, USA|
|Paul Zimba, University of Maryland, USA|
Laws EA eds. (1985) Nutrient and energy cycling among phytoplankton, bacteria, and zooplankton. Kaneohe, Hawaii, 102 pp.
Coming soon. Please send any scanned photos from the Pauley Summer Program to firstname.lastname@example.org.
A list of publications that directly or indirectly resulted from scientific concepts, training, or research experiences during the Pauley Summer Program.