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JOURNAL OF PLANKTON RESEARCH | VOLUME 18 | NUMBER 4 | PAGES 539-550 | 1996
© Oxford University Press

research-article

Occurrence of viable photoautotrophic picoplankton in the aphotic zone of Lake Biwa, Japan

Mitsuru Eguchi1, Takemi Oketa1,3, Nobukazu Miyamoto1, Hiroto Maeda2,4 and Akira Kawai1

1Department of Fisheries, Kinki University Nara 631, Japan 2Lake Biwa Research Institute Otsu, Shiga 520, Japan 3Present address: Matsushita Electric Industrial Co., Ltd Nara 639-11, Japan 4Present address: Faculty of Fisheries, Kagoshima University Kagoshima 890, Japan

Received on July 6, 1995; accepted on November 20, 1995 The distribution and abundance of photoautotrophic picoplankton (PPP. Synechococcus group) in the aphotic bottom sediments of Lake Biwa were investigated by direct counting and viable counting (most probable number, MPN) methods. In the surface layer of bottom sediments (0–1 cm). where large PPP blooms occurred in the past 5 years, >105 cells cm–3 of PPP were found to be viable throughout the year. Furthermore, the density of PPP deposited on the sediment surface (0–0.1 cm) was one order of magnitude higher (MPN = 1.3 x 106 cells cm–3. direct count = 9.9 x 106 cells cm–3) than that of bulked surface sediments (0–1 cm). Even in the deeper layer (13–14 cm) of bottom mud, viable PPP were still found (101 cells cm–1. In winter, viable PPP in the aphotic bottom sediments were 104–105 times greater per Unit volume than those in the euphotic lake water. Since the aphotic bottom sediments have high levels of PPP, as well as high growth potential (high ratio of viable count/total direct count), they are likely to seed PPP blooms in the North Basin of Lake Biwa.


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