Multi-year succession of cyanobacteria blooms in a highland reservoir with changing nutrient status, Guizhou Province, China

Over the last 22 years significant phytoplankton changes in Hongfeng lake reservoir have been observed with multiple years of harmful cyanobacteria blooms (cHABs). Fish farming and other anthropogenic activities from 1994-2001 triggered the harmful blooms. Nine years after the cessation of aquacultu...

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Bibliographic Details
Published in:Journal of limnology 2018-01, Vol.77 (2), p.232-246
Main Authors: Long, Shengxing, Hamilton, Paul B., Yang, Yang, Ma, Jianrong, Chobet, Ondhoro C., Chen, Chuan, Dang, Anzhi, Liu, Zhiwei, Dong, Xian, Chen, Jiangan
Format: Article
Language:English
Subjects:
Algae
anthropogenic activities
Anthropogenic factors
Aphanizomenon
Aphanizomenon flos-aquae
Aquaculture
Aquatic communities
Blooms
China
competitive succession
Cyanobacteria
cyanobacteria blooms
Ecological succession
Economics
environmental factors
Fish
Fish culture
Fish farms
Freshwater
Freshwater lakes
Lakes
Microcystis
Mineral nutrients
Nitrogen
nitrogen and phosphorus
Nutrient availability
Nutrient loading
Nutrient status
Nutrients
Phosphorus
Phytoplankton
Plankton blooms
pollution load
Pseudanabaena
Pseudanabaena limnetica
remediation
Reservoir management
Species
Species diversity
summer
Taxa
temperature
total nitrogen
total phosphorus
toxicity
Trophic factors
water management
Water quality
Water reservoirs
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Summary:Over the last 22 years significant phytoplankton changes in Hongfeng lake reservoir have been observed with multiple years of harmful cyanobacteria blooms (cHABs). Fish farming and other anthropogenic activities from 1994-2001 triggered the harmful blooms. Nine years after the cessation of aquaculture, a conversion from problematic species (Microcystis spp, Aphanizomenon flos-aquae) to the less problematic species P. limnetica and other associated non-cyanobacteria taxa was recorded. Through this period of change, trophic factors (bottom-up) were re-examined, and correlations between cHABs and selected environmental variables were observed. Higher temperatures, nutrients (TN, TP) and available light significantly favored the development of Microcystis spp blooms. With declining nutrient loads, and a decline in TP relative to TN there was a competitive shift from Microcystis summer blooms to the growth of Pseudanabaena limnetica and other non-cyanobacteria. Pseudanabaena limnetica was favored over Microcystis spp when temperatures were
ISSN:1129-5767
1723-8633
DOI:10.4081/jlimnol.2018.1636