Journal Title
Title of Journal: Limnology
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Authors: Xiuyun Cao Chunlei Song Yiyong Zhou Alena Štrojsová Petr Znachor Eliška Zapomělová Jaroslav Vrba
Publish Date: 2009/03/24
Volume: 10, Issue: 2, Pages: 95-104
Abstract
Extracellular phosphatases are an important part of the phosphorus cycle in aquatic environments Phosphatase activity PA in plankton was studied in seven subtropical shallow lakes of different exploitation management and trophic status in the urban area of Wuhan City Bulk PA was rather high range 11–11 μmol l−1 h−1 although concentrations of soluble reactive phosphorus SRP were also high range 27 μg P l−1 to ~15 mg P l−1 in all lakes Cellassociated extracellular PA in phytoplankton was detected using the fluorescencelabelled enzyme activity technique Phytoplankton species partly contributed to the bulk PA We found explicit differences in the presence of cellassociated phosphatase within the main phytoplankton groups species belonging to Chlorophyta and Dinophyta were regularly phosphatasepositive while Cyanophyta and Bacillariophyceae were phosphatasenegative in all but one case Furthermore there is a certain potential of extracellular phosphatases produced by heterotrophic nanoflagellates in most of the lakes This new finding compromises the ‘traditional’ interpretation of bulk phosphatase data as being due to overall phytoplankton or bacterial P regenerationThis work was partly supported by the following projects the National Science Foundation of China 30600088 grants kzcx2yw426 A6017202 of the Grant Agency of the AS CR awarded to JV 36–20 of the SinoCzech Scientific and Technological Cooperation awarded to XC MŠM 6007665801 and ME 617 of the Czech Ministry of Education Youth and Sports awarded to JV and AŠ WS Feng provided an epifluorescence microscope with image analysis in Wuhan G Liu and J Wang helped with algal determination the Research Group on Purification and Restoration Ecology kindly provided the sampling map and information on the lakes We thank J Nedoma for fruitful discussions and critical reading of the draft KR Edwards corrected the final text
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