Aquatic Sciences Meeting, Albuquerque 2001

PC16 Microbial Dynamics

Date: Thursday, February 15, 2001

Location: Southwest Hall

Shinada, A, , Nagoya University, Nagoya, Japan, shinada@ihas.nagoya-u.ac.jp

Suzuki, K, , Nagoya University, Nagoya, Japan, kojis@ihas.nagoya-u.ac.jp

Hosaka, T, , Nagoya University, Nagoya, Japan, thosaka@ihas.nagoya-u.ac.jp

Minami, C, , Nagoya University, Nagoya, Japan, maru@ihas.nagoya-u.ac.jp

Saino, T, , Nagoya University, Nagoya, Japan, tsaino@ihas.nagoya-u.ac.jp

ECOLOGICAL EFFICIENCY BETWEEN PICO-PLANKTON AND NANO-ZOOPLANKTON IN TEMPERATE COASTAL WATERS DURING SUMMER

Ecological efficiency, which is defined by the amount of energy extracted from a given trophic level divided by the energy supplied to that trophic level, is one of the most important parameters to quantify the carbon fluxes in the water. The main purpose of this study is to assess the ecological efficiencies between pico-plankton such as bacteria, cyanobacteria, and eukaryotic pico-phytoplankton and nano-zooplankton in temperate coastal waters, Japan, during summer. Two techniques were applied to determine the ecological efficiencies: one was the dilution method to estimate the phytoplankton growth rates and their mortality rates, and the other was the size-fraction method to determine the growth rate of bacteria and feeding rate of micro-zooplankton on nano-zooplankton. Although the pico-plankton growth rates such as pico-size chl a and bacteria varied from 0.45 to 1.06 d-1 during experiments, the feeding rates of nano-zooplankton on pico-plankton were balanced with the pico-plankton growth rates. These results suggest that the pico-plankton production may be equal to the biomass consumed by nano-zooplankton. We will also discuss the food web structures including the relationship between bacteria, phytoplankton, nano-zooplankton, and micro-zooplankton.

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Aquatic Sciences Meeting, Albuquerque 2001

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