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Nutrient and Energy Cycling Among Phytoplankton, Bacteria, and Zooplankton

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Title:Nutrient and Energy Cycling Among Phytoplankton, Bacteria, and Zooplankton
Authors:Laws, Edward A.
LC Subject Headings:Marine bacteria--Hawaii--Kaneohe Bay.
Marine phytoplankton--Hawaii--Kaneohe Bay.
Marine zooplankton--Hawaii--Kaneohe Bay.
Date Issued:1985
Publisher:Hawai'i Institute of Marine Biology (formerly Hawai'i Marine Laboratory)
Citation:Laws, EA. 1985. Nutrient and energy cycling among phytoplankton, bacteria, and zooplankton. Honolulu (HI): Hawai’i Institute of Marine Biology, University of Hawai’i. Report No.: 38.
Series:HIMB Technical Reports
No. 38
Abstract: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 um). 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 rnicrospheres yielded results in excellent agreement
with known grazing rates measured in a continuous culture system.
Use of bacteria uniformly labeled with 14c was found to be a
promising technique for estimating bacteriovore grazing rates and
assimilation efficiencies. Studies of the benthic diatom
Nitzschia graeffei indicated that 6-40% of the carbon assimilated
by this organism was obtained via photoheterotrophy.
Pages/Duration:144 pages
Appears in Collections: HIMB Technical Reports

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