Premium
Studies on Temporal and Spatial Variations of Phytoplankton in Lake Chaohu
Author(s) -
Deng DaoGui,
Xie Ping,
Zhou Qiong,
Yang Hua,
Guo LongGen
Publication year - 2007
Publication title -
journal of integrative plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.734
H-Index - 83
eISSN - 1744-7909
pISSN - 1672-9072
DOI - 10.1111/j.1744-7909.2007.00390.x
Subject(s) - eutrophication , dominance (genetics) , phytoplankton , cyanobacteria , zooplankton , biomass (ecology) , environmental science , ecology , anabaena , nitrate , biology , nutrient , biochemistry , genetics , bacteria , gene
Temporal and spatial variations of the phytoplankton assemblage in Lake Chaohu, a large shallow eutrophic lake in China, were studied from September 2002 to August 2003. A total of 191 phytoplankton species was identified, among which Chlorophytes (101) ranked the first, followed by Cyanophytes (46) and Bacillariophytes (28). On average over the entire lake, the maximum total algal biomass appeared in June (19.70 mg/L) with a minimum (5.05 mg/ L) in November. In terms of annual mean biomass, cyanobacteria contributed 45.43% to total algal biomass, followed by Chlorophytes (27.14%), and Bacillariophytes (20.6%). When nitrate (NO 3 ‐N) and ammonium (NH 4 ‐N) concentrations dropped in spring, fixing‐nitrogen cyanobacterium ( Anabaena ) developed quickly and ranked the first in terms of biomass in summer. It is likely that dominance of zooplanktivorous fish and small crustacean zooplankton favored the development of the inedible filamentous or colony forming cyanobacteria. The persistent dominance of cyanobacteria throughout all seasons may indicate a new tendency of the response of phytoplankton to eutrophication in Lake Chaohu.