Section 21
Chapter 20,706

Changes in the bacterioplankton production and dominant algal species in the North Basin of Lake Biwa

Nakano, S-i.

Japanese Journal of Limnology 532: 145-149


ISSN/ISBN: 0021-5104
Accession: 020705576

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Production of bacterioplankton was studied together with phytoplankton composition at a pelagic site in the north basin of Lake Biwa from 19 February to 7 June 1990. During the investigation period, two species of phytoplankton predominated: Asterionella formosa (Bacillariophyceae) from 19 February to 18 April (the early period) and Uroglena americana (Chrysophyceae) from 9 May to 7 June (the late period). Bacterioplankton production estimated by the frequency of dividing cells method remained at a high level during the early period, ranging from 7.4 to 33 .mu.gC.cntdot.1-1.cntdot.d-1. During the late period, bacterioplankton production was low, ranging from 4.1 to 18 .mu.gC.cntdot.1-1.cntdot.d-1. The change in bacterioplankton production appeared to relate to the change in phytoplankton composition.

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