Characterization of phytoplankton community in a river ecosystem using pigment composition: a feasibility study
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CYANOBACTERIAL BLOOMS AND WATER ECOLOGICAL RESTORATION
Characterization of phytoplankton community in a river ecosystem using pigment composition: a feasibility study Yaqi Tian 1,2 & Li Gao 3 & Jianming Deng 1
&
Ming Li 2
Received: 23 August 2019 / Accepted: 29 November 2019 # Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract CHEMTAX is a mathematical software for phytoplankton composition evaluation using pigment composition. Although this method has been previously applied in the ocean environment, we firstly utilized the combination of matrix factorization program CHEMTAX and high-performance liquid chromatography (HPLC) to characterize the phytoplankton community from a river system (western part of Weihe River Basin). The obtained results were compared with those from microscopic examination. Based on the comparison, it is suggested that after increasing the ratio of characteristic pigment to chlorophyll a of diatoms and euglena, the diatoms calculated by the CHEMTAX method accounted for 80% of the total biomass, and the results were consistent with microscopic examination, but diatoms obtained from F2, C1 and W5 sample sites were significantly overestimated 33%~60%. The comparison also showed that the model always underestimated cyanobacteria (sample sites F2, C1 were underestimated 25%) and euglena were overestimated (sample sites W3, Q1 were respectively overestimated 33%, 23%), but for chlorophytes, both overestimation and underestimation could occur. When the relevant results from previous applications in the ocean phytoplankton community evaluation were taken into consideration, it can be concluded that CHEMTAX-HPLC method was not accurate enough to characterize the phytoplankton communities in the freshwater (river/ lake) ecosystem. Keywords CHEMTAX-HPLC . Phytoplankton . Pigment . Freshwater ecosystem
Introduction Phytoplankton are the major primary producers and main source of organic matter in the aquatic ecosystems (Hanamachi et al. 2008). The composition of phytoplankton community directly affects the energy source and ecological stability of aquatic ecosystems. Changes in phytoplankton
Responsible editor: Philippe Garrigues * Jianming Deng [email protected] 1
Taihu Lake Laboratory Ecosystem Research Station, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
2
College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, People’s Republic of China
3
South East Water, 101 Wells Street, Frankston, VIC 3199, Australia
community composition could also reflect the quality of water environment (Du et al. 2011). Microscopic examination is a popular method for phytoplankton community evaluation; however, it is a labor-intensive process and requires highly skilled or experienced personnel for the evaluation. Consequently, it is difficult to monitor and evaluate phytoplankton community at a high frequency and a large geographical scale; it is desir
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