Journal
HARMFUL ALGAE
Volume 10, Issue 3, Pages 337-343Publisher
ELSEVIER
DOI: 10.1016/j.hal.2010.12.002
Keywords
Nutrient ratios; Temperature; Microcystis blooms; Canonical correspondence analysis; Lake Taihu
Categories
Funding
- NKBRSF, PR China [2008CB418005]
- NSFC [30670405]
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The temporal distribution of bloom-forming cyanobacteria- Microcystis and its correlation with related physical and chemical variables including the total nitrogen-to-total phosphorus ratio (TN:TP), the ammonium-to-nitrate ratio (NH4-N:NOx-N), water temperature, and pH in the north part of Lake Taihu (Meiliang Bay) were investigated, using a continuous, 11-year record of environmental data (1992-2002) and phytoplankton species. A multivariate statistical analysis, canonical correspondence analysis (CCA), revealed a negative correlation between the Microcystis and TN:TP, and a positive correlation between the Microcystis and NH4-N:NOx-N, water temperature and pH. Warm water temperature was the principal force driving Microcystis blooms, which were preceded declining concentrations of nitrogen compounds. Microcystis tended to dominate (Microcystis contributed above 50% to total algal mass) in the north part of Lake Taihu during summer when the TN:TP mass ratio was less than 30. NH4-N:NOx-N was below 1, and a critical water temperature ranged from 25 degrees C to 30 degrees C. respectively. Meanwhile, suspended solids (SS) concentrations exceeded 10 mg l(-1) and pH exceeded 8.0 during blooms. Overall, this study advances our understanding of nutrient enrichment and high ambient temperature influences on Microcystis biomass. (C) 2010 Elsevier B.V. All rights reserved.
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