Analysis of the change in dominant phytoplankton species in unstratified Lake Oshima-Ohnuma estimated by a bottle incubation experiment

被引：8

作者：

Takano K. ^{[1
]}

Ishikawa Y. ^{[2
]}

Mikami H. ^{[2
]}

Ban S. ^{[3
]}

Yoshida T. ^{[3
]}

Aono T. ^{[3
]}

Imada K. ^{[4
]}

Yasutomi R. ^{[4
]}

Takeuchi K. ^{[4
]}

Hino S. ^{[5
]}

机构：

[1] Hokkaido Institute of Public Health, Kita-ku, Sapporo 060-0819

[2] Hokkaido Institute of Environmental Sciences, Sapporo

[3] Department of Biological Oceanography, Faculty of Fisheries, Hokkaido University, Hakodate

[4] Hokkaido Institute of Fish Hatchery, Eniwa

[5] Department of Materials and Biological Chemistry, Faculty of Science, Yamagata University, Yamagata

来源：

Limnology | 2001年 / 2卷 / 1期

关键词：

Dominant phytoplankton; Grazing; Growth rate; Lake Oshima-Ohnuma; Nutrient limitation;

D O I：

10.1007/s102010170013

中图分类号：

学科分类号：

摘要：

The densities and growth rates of dominant phytoplankton in Lake Oshima-Ohnuma were determined during May to July 1996 to clarify the mechanism of change from spring-dominant to summer-dominant phytoplankton species, examining the influence of zooplankton grazing and nutrient limitation. The dominant phytoplankton in April and May were Asterionella gracillima and Nitzschia spp. Their growth rates were low in May and their densities fell thereafter. The bottle experiment suggests that the main reason for decreases in dominant species has been nutrient deficiency, and zooplankton (sized from 30 to 160μm) have supported the growth of A. gracillima to recycle nutrients in May. The maximum growth rate was shown by Melosira (Aulacoseira) ambigua living at 2m in May and June. Although the growth rate of the summer-dominant species Melosira (Aulacoseira) granulata was not as high as that of M. ambigua in May and June, the ambient density increased from late June. Survival in the lower zone of the unstratified euphotic layer might have contributed to the abundance of M. granulata, since the growth rate of this species was not so low as that of M. ambigua at 6m in June and July. The bottle experiment suggests that the growth of M. granulata was also nutrient limited in June and July and that zooplankton grazing was partially responsible for repressing the biomass of M. granulata before it began growing rapidly in late June.

引用

页码：29 / 35

页数：6

共 20 条

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