Journal
HARMFUL ALGAE
Volume 84, Issue -, Pages 84-94Publisher
ELSEVIER
DOI: 10.1016/j.hal.2019.02.002
Keywords
Cyanobacterial blooms; Microcystis; Dolichospermum; Aphanizomenon; Eutrophication; Lake Taihu; Lake Chaohu; Lake Dianchi
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Funding
- National Natural Science Foundation of China [41561144008, 51609229]
- Chongqing Science and Technology Commission [cstc2017jcyjAX0241]
- National Key Scientific and Technological Project of China [2014ZX07104-006]
- National Basic Research Program of China [2008CB418006]
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Non-diazotrophic Microcystis and filamentous N-2-fixing Aphanizomenon and Dolichosperrnum (formerly Anabaena) co-occur or successively dominate freshwaters globally. Previous studies indicate that dual nitrogen (N) and phosphorus (P) reduction is needed to control cyanobacterial blooms; however, N limitation may cause replacement of non- N-2-fixing by N-2-fixing taxa. To evaluate potentially counterproductive scenarios, the effects of temperature, nutrients, and zooplankton on the spatio-temporal variations of cyanobacteria were investigated in three large, shallow eutrophic lakes in China. The results illustrate that the community composition of cyanobacteria is primarily driven by physical factors and the zooplankton community, and their interactions. Niche differentiation between Microcystis and two N-2-fixing taxa in Lake Taihu and Lake Chaohu was observed, whereas small temperature fluctuations in Lake Dianchi supported co-dominance. Through structural equation modelling, predictor variables were aggregated into 'composites' representing their combined effects on species-specific biomass. The model results showed that Microcystis biomass was affected by water temperature and P concentrations across the studied lakes. The biomass of two filamentous taxa, by contrast, exhibited lake-specific responses. Understanding of driving forces of the succession and competition among bloom-forming cyanobacteria will help to guide lake restoration in the context of climate warming and N:P stoichiometry imbalances.
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