Analysis of the Change in Dominant Phytoplankton Species in Unstratified Lake Oshima-Ohnuma Estimated by a Bottle Incubation Experiment

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概要

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• 1996年5～7月に、渡島大沼において、優占植物プランクトンの細胞密度を測定し、さらにボトル培養実験によりそれらの成長速度を見積り、春から夏への植物プランクトン優占種変化に関わる要因を明らかにすることを試みた。4、5月にAsterionella gracillimaが優占種となったが、その成長速度は5月には比較的低く、その後、細胞密度が低下し、この主な原因は栄養塩の不足であることが示唆された。6月後半からMelosira gramulataの成長速度が増加し、優占種となった。M.gramulataは水深6mでも成長速度が高いことから、深層で生存できることと、湖が成層を形成しないことで再懸濁により有光層に存在できる状況が同種の成長に適していることが考えられた。

• 2001-04-01

著者

• Ban Syuhei

  Department Of Biological Oceanography Faculty Of Fisheries Hokkaido University

• TAKANO Keishi

  Hokkaido Institute of Public Health

• HINO Shuji

  Department of Material and Biological Chemistry, Faculty of Science, Yamagata University

• Hino S

  Department Of Materials And Biological Chemistry Faculty Of Science Yamagata University

• Hino Shuji

  Department Of Material And Biological Chemistry Faculty Of Science Yamagata University

• ISHIKAWA Yasushi

  Hokkaido Institute of Environmental Sciences

• MIKAMI Hidetoshi

  Hokkaido Institute of Environmental Sciences

• YOSHIDA Takehito

  Department of Biological Oceanography, Faculty of Fisheries, Hokkaido University

• AONO Tetsuhiro

  Department of Biological Oceanography, Faculty of Fisheries, Hokkaido University

• IMADA Kazushi

  Hokkaido Institute of Fish Hatchery

• YASUTOMI Ryohei

  Hokkaido Institute of Fish Hatchery

• TAKEUCHI Katsumi

  Hokkaido Institute of Fish Hatchery

• Imada Kazushi

  Hokkaido Fish Hatchery

• Aono Tetsuhiro

  Department Of Biological Oceanography Faculty Of Fisheries Hokkaido University

• Yoshida Takehito

  Research Institute For Humanity And Nature

• Takeuchi Katsumi

  Hokkaido Fish Hatchery

• Mikami H

  Hokkaido Institute Of Environmental Sciences

• Syuhei Ban

  Department of Biological Oceanography, Faculty of Fisheries, Hokkaido University

• Yasuda Takehito

  Department of Biological Oceanography, Faculty of Fisheries, Hokkaido University

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