The effect of elevated CO2 on autotrophic picoplankton abundance and production in a eutrophic lake (Lake Taihu, China)
Shengnan Li A B , Jian Zhou A B , Lijun Wei A B , Fanxiang Kong A and Xiaoli Shi A C
+ Author Affiliations
- Author Affiliations
A State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
B University of Chinese Academy of Sciences, Beijing 100049, China.
C Corresponding author. Email: xlshi@niglas.ac.cn
Marine and Freshwater Research 67(3) 319-326 https://doi.org/10.1071/MF14353
Submitted: 8 November 2014 Accepted: 12 February 2015 Published: 22 June 2015
Abstract
The effects of elevated CO2 concentrations on the community structure and primary production of the autotrophic picoplankton of a eutrophic lake were studied in Lake Taihu, China. We conducted in situ experiments with three CO2 concentrations (270, 380 and 750 ppm) over four seasons during 2012 and 2013. Our results showed that phycocyanin-rich picocyanobacteria were dominant in winter and that photosynthetic picoeukaryotes were prevalent during the other three seasons. CO2 elevation could significantly increase the abundance of photosynthetic picoeukaryotes in all seasons except winter, but did not have any influence on picocyanobacterial abundance. CO2 enrichment caused an increase in the primary production of the picoplankton community in most seasons, and significant differences were observed among the treatments in summer and winter. In addition, the contribution of picoplankton to total primary production significantly increased under higher CO2 concentrations in winter. The increase in the abundance of photosynthetic picoeukaryotes and the primary production of picoplankton under high CO2 concentrations may reduce the transfer of matter and energy to higher trophic levels and increase the importance of the microbial food web.
Additional keywords: flow cytometry, photosynthetic picoeukaryotes, picocyanobacteria.
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