Cyanobacterial bloom associated with a complete turnover of a Daphnia population in a warm‐temperate eutrophic lake in Eastern China

Abstract

1. The effect of cyanobacterial blooms on aquatic ecosystems has received wide attention, yet little is known about their impacts on zooplankton genetic structure.2. For 26 months (April 2012-May 2014), we monitored zooplankton in a warmtemperate ice-free lake in Eastern China, with an emphasis on seasonal population dynamics of the cladoceran, Daphnia galeata. There was a seasonal succession in the zooplanktonic community (composed of Cladocera, Copepoda, and Rotifera).3. Genetic analysis (based on 14 microsatellite loci) of the 21 monthly samples in which D. galeata was present demonstrated that several clones could successfully overwinter and/or persist for many months. However, all clones, including these long-lived clones, were completely replaced by new ones after October 2013, probably due to cyanobacteria blooms in that summer. A high clonal richness coupled with high turnover rate was observed in the D. galeata population overall, suggesting frequent sexual reproduction.4. Daphnia galeata experimentally fed with a diet of Microcystis aeruginosa (the most abundant toxic cyanobacterial species in the lake) had a substantially reduced survivorship, consistent with the field observations. 5. Our findings highlight the changes of zooplanktonic population dynamics in terms of both community and clonal structure in a warm-temperate ice-free lake, and call for further investigation on ecological responses of zooplankton to cyanobacterial blooms.

Transcriptome analysis reveals the molecular basis of anti‐predation defence in Daphnia pulex simultaneously responding to Microcystis aeruginosa

“…Interference of cyanobacteria with community structure and traits continues to attract attention as a predictor of aquatic ecosystem function (Gao et al, 2022; Ma et al, 2022). The present study revealed that both MP‐ Mic and MF‐ Mic significantly affected the morphological and life‐history responses of D .…”

Industrial and agricultural land uses affected the water quality and shaped the bacterial communities in the inflow rivers of Taihu Lake

“…Water quality in China has declined in recent decades due to rapid urbanization and industrialization (Liu and Raven, 2010;Ma et al, 2022). Although measures have been continuously taken to control pollution, the problems of eutrophication, antibiotics, heavy metals, microbial pathogens, and other pollutants persist (Xu et al, 2014;Mekonnen and Hoekstra, 2015;Zhang et al, 2015;Zhao et al, 2018;Yang et al, 2020).…”

“…Deaths and illnesses including diarrhoea and liver and gastric cancers caused by the consumption of contaminated water have been reported in some areas of China over the past decade (Tao and Xin, 2014;Chen et al, 2019). Eutrophication, the major concern for freshwater ecology in China, has been reported in lakes and rivers nationwide (Wang et al, 2019a;Wang et al, 2019b;Lin et al, 2021) and algal blooms remain a common unresolved issue in some water bodies (Paerl et al, 2011;Yu et al, 2020;Ma et al, 2022). As a consequence, it is important that pollution sources are identified and efficiently tracked, and management strategies properly developed.…”