Mesozooplankton influences on the microbial food web: direct and indirect trophic interactions in the oligotrophic open ocean

Article Abstract:

Mesozooplankton as a factor in the microbial food web and its direct/indirect trophic interactions in the oligotrophic open ocean are discussed as studied in the subtropical North Pacific using cruise grazing experiments with different concentration treatments of the mixed mesozooplankton community. Increasing the concentration of mesozooplankton raised growth rates of heterotrophic bacteria, and mesozooplankton fed diverse microzooplankton and nanoheterotrophs and their predation indirectly raised net phytoplankton/heterotroph growth rates

Hawaii, Planning, Usage, Zooplankton, Bacteria, Heterotrophic, Heterotrophic bacteria, Biological models, Food chains (Ecology), Food chains, Marine biology, Phytoplankton, Copepoda, Copepods, Tropics, Marine biology research vessels

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The role of dissolved organic matter release in the productivity of the oligotrophic North Pacific Ocean

Article Abstract:

Field experiments indicate that the rates of in situ gross and net primary production in the subtropical North Pacific Ocean have been underestimated by up to as much as 30-50% and 15-30%, respectively. Fundamental changes seem to have occurred in the flow of carbon in the oceanic ecosystem, due to a change from an N-limited system to a P-limited system at Station ALOHA, Hawaii, and perhaps over the whole subtropical North Pacific.

Primary productivity (Biology)

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Application of a novel method for phosphorus determinations in the oligotrophic North Pacific Ocean

Article Abstract:

A new method is presented for direct measurement of orthophosphate (Pi) concentrations in seawater without interference from other reactive P compounds, based on a modification of the magnesium-induced coprecipitation technique. Topics include comparisons between 32Pi and 31Pi, phosphorus compound interference, soluble reactive P measurements, nonphosphate phosphorus measurements, and brucite adsorption experiments.

Water, Composition, Water chemistry, Phosphorus (Chemical element), Sea-water, Seawater

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