Seasonal Changes in Nano/Micro-Zooplankton Herbivory and Heterotrophic Nano-Flagellates Bacterivory off Cape Esan, Southwestern Hokkaido, Japan |
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| Authors: | Akiyoshi Shinada Syuhei Ban Tsutomu Ikeda |
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| Institution: | (1) Faculty of Fisheries Science, Hokkaido University, Minato-cho, Hakodate 041-0821, Japan |
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| Abstract: | Seasonal changes in nano/micro-zooplankton grazing on pico-, nano- and micro-size phytoplankton and heterotrophic nano-flagellates
(HNF) feeding on heterotrophic bacteria were quantified by the dilution technique in the surface layer off Cape Esan, southwestern
Hokkaido, Japan. Pico- and nano-size phytoplankton were major components throughout the year except in spring when a diatom
bloom was observed. Although there was little seasonal variation in bacteria and HNF biomass throughout the year, the micro-zooplankton
biomass varied appreciably with a peak in spring. Nano/micro-zooplankton grazing or feeding on pico-size chl-a and bacteria were well balanced throughout the year. However, nano-size and micro-size chl-a growth were much greater than grazing in summer. Nano/micro-zooplankton ingestion of phytoplankton was greater than their
ingestion of bacteria almost throughout the year, which suggests phytoplankton are more important as food sources of nano/micro-zooplankton
in microbial food webs off Cape Esan than bacteria off Cape Esan.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | Microbial food web dilution method micro-zooplankton HNF bacteria |
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