Abundance and pigment type composition of picocyanobacteria in Barguzin Bay, Lake Baikal

被引:0
作者
Toshiya Katano
Shin-ichi Nakano
Osamu Mitamura
Haruko Yoshida
Hisayuki Azumi
Yoshiki Matsuura
Yuji Tanaka
Hiraku Maezono
Yasuhiro Satoh
Takeshi Satoh
Yuko Sugiyama
Yasunori Watanabe
Tetsuro Mimura
Yuki Akagashi
Hiroshi Machida
Valentin V. Drucker
Irina Tikhonova
Olga Belykh
Vladimir A. Fialkov
Myung-Soo Han
Sung-Ho Kang
Masahito Sugiyama
机构
[1] Ehime University,Center for Marine Environmental Studies
[2] Hanyang University,Department of Life Science
[3] Ehime University,Faculty of Agriculture
[4] University of Shiga Prefecture,School of Environmental Science
[5] Tokyo University of Marine Science and Technology,Faculty of Science
[6] Yamagata University,School of Human Science and Environment
[7] University of Hyogo,Faculty of Geo
[8] Rissho University,Environmental Science
[9] Kobe University,Department of Biology, Graduate School of Science
[10] Kyoto University,Faculty of Integrated Human Studies
[11] Siberian Branch of the Academy of Sciences,Limnological Institute
[12] Siberian Branch of the Academy of Sciences,Baikal Museum
[13] Korea Polar Research Institute,undefined
[14] Get Pearl Tower,undefined
来源
Limnology | 2008年 / 9卷
关键词
Lake Baikal; Picocyanobacteria; Picophytoplankton; Phycocyanin (PC); Phycoerythrin (PE);
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学科分类号
摘要
In Lake Baikal, picocyanobacteria are the most important primary producers during the summer. Freshwater picocyanobacteria are discriminated into either the phycoerythrin (PE)-rich or the phycocyanin (PC)-rich types according to their pigment composition. The distributions of these two types of picocyanobacteria were investigated in Barguzin Bay. The PC-rich type accounted for >98% of the total picocyanobacteria at the station near the shore of the bay where river water flows directly in. In the offshore area of the lake, all of the picocyanobacteria cells were of the PE-rich type. In addition, the occurrence of the PC-rich type was restricted to the station, where the attenuation coefficient exceeded 0.25 m−1. Near the shore, where the turbidity was high (>1 NTU), the cell densities of both the PE- and PC-rich types increased away from the river mouth. This indicates that the PC-rich type cells grow near the shore of the bay where turbidity is high. Since the PC-rich type could not grow well when cells were incubated in offshore lake water, restricted distribution of the PC-rich type could also be explained by their growth capability. The present study clearly demonstrated the shift in the pigment type composition of picocyanobacteria from the coastal to the pelagic zone of Lake Baikal. The co-existence of the two pigment types probably enables the abundance of the picocyanobacterial community to be stable over a broader range of environmental conditions than would be possible for a single pigment type.
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页码:105 / 114
页数:9
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