Mixotrophic Ochromonas addition improves the harmful Microcystis-dominated phytoplankton community in in situ microcosms
Mixotrophic Ochromonas addition improves the harmful Microcystis-dominated phytoplankton community in in situ microcosms
复制标题
添加混合营养型 Ochromonas 可改善原位微观世界中以微囊藻为主的有害浮游植物群落
DOI：
10.1021/acs.est.9b06438
复制
发表时间：
2020
影响因子：
11.4
通讯作者：
Yang Zhou
中科院分区：
文献类型：
--
作者：
Zhang Lu;Wang Zeshuang;Wang Na;Gu Lei;Sun Yunfei;Huang Yuan;Chen Yafen;Yang Zhou
Driven by global warming and eutrophication, outbreaks of cyanobacterial blooms have severely impacted ecosystem stability and water safety. Of the organisms used to control cyanobacteria, protozoa can highly resist cyanotoxins, efficiently control cyanobacterial populations, and show considerably different feeding strategies from those of metazoans. Thus, protozoa have great potential to control harmful cyanobacteria and improve phytoplankton composition in eutrophic waters. To evaluate the actual effects of protozoa in controlling cyanobacteria and improving the phytoplankton community structure in the field, an in situ microcosm study was performed using a flagellate Ochromonas gloeopara that ingests Microcystis. Results showed that adding Ochromonas reduced the cyanobacterial populations and increased the chlorophyte and diatom proportions. Furthermore, the species richness and diversity of the phytoplankton community were enhanced in microcosms with Ochromonas. Additionally, there was a gradual increase in the chlorophyte population in the unicellular Microcystis control, while Ochromonas addition significantly accelerated the replacement of dominant species. This study was the first to show the practical effects of protozoa on controlling cyanobacteria in the field, highlighting that a reduction in in situ cyanobacteria via protozoa can improve the phytoplankton community structure, dredge the toxic cyanobacteria-dominated microbial food web, and mitigate harmful cyanobacteria risks in fresh waters.
