Abstract
Eutrophication and salinization are serious global environmental problems in freshwater ecosystems, occasionally acting jointly to exert harmful effects on aquatic ecosystems. To elucidate the interactive effects of nutrients and salinity on phytoplankton assemblages, we conducted a four-season study during 2020–2021 of eight lakes from Yunnan Plateau (Southwest China) with a wide range of conductivities (Cond, reflecting degree of salinization), eutrophic states, and water depths and used General Additive Modeling (GAM) of the data. We found that: (1) species number (SN), density (DPhyt), and biomass (BPhyt) of phytoplankton showed stronger seasonal dynamics in shallow lakes than in deep lakes, all being, as expected, higher in the warm season; (2) annual and summer data revealed highly significant positive relationships between SN, DPhyt, and BPhyt with total nitrogen (TN) and total phosphorus (TP), which became weaker at high TP occurring when the N:P ratio was low, indicating N limitation; (3) SN, DPhyt, and BPhyt showed a unimodal relationship with salinity, peaking at 400–1000 μS/cm (Cond); (4) the two dominant taxa (cyanobacteria and chlorophyta) showed different patterns, with chlorophyta generally dominating at low TN and cyanobacteria at high TN and Cond, suggesting the synergistic effect of nitrogen and Cond on cyanobacterial dominance.
Funder
Yunnan Provincial Department of Science and Technology
Strategic Priority Research Program of the Chinese Academy of Sciences
TÜBITAK program BIDEB2232
Subject
Water Science and Technology,Aquatic Science,Geography, Planning and Development,Biochemistry
Reference64 articles.
1. Eutrophication Science: Where Do We Go from Here?;Smith;Trends Ecol. Evol.,2009
2. Eutrophication: A New Wine in an Old Bottle?;Souchon;Sci. Total Environ.,2019
3. Jeppesen, E., Pierson, D., and Jennings, E. (2021). Effect of Extreme Climate Events on Lake Ecosystems. Water, 13.
4. Climate Change: A Catalyst for Global Expansion of Harmful Cyanobacterial Blooms;Paerl;Environ. Microbiol. Rep.,2009
5. Phytoplankton Indicators and Their Relations to Certain Chemical and Physical Factors;Limnologica,1981
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献