There are only 21 species of benthonic animals in the Nanhu Lake,Changchun.The dominant species in the benthos community are obvious,and the individual quantity of Limnodrilus hoffmeisteri,Branchiura sowerbyi,and Tend...There are only 21 species of benthonic animals in the Nanhu Lake,Changchun.The dominant species in the benthos community are obvious,and the individual quantity of Limnodrilus hoffmeisteri,Branchiura sowerbyi,and Tendipus plumosus accounts for 87% of the total individual quantity of all benthonic animals.It indicates that the water in the Nanhu Lake is suffering serious organic pollution,and belongs to an eutrophic lake.The peak values of benthos biomass and energy are found in July(48 23gWW·m -2 and 241 16kJ·m -2 respectively),while the maximum individual quantity is appeared in May(401ind·m -2 ).The distribution of Oligochaeta and aquatic insects has a significant positive correlation to organic content in the sediment(α<0 05).The community structure of benthonic animals reflects adequately the feature of the Nanhu Lake as an eutrophic lake in temperate zone.展开更多
: The phytoplankton community structure, in terms of species composition, total standing crop, and abundance of the dominant algal species, at four stations in Donghu Lake, Wuhan, China, was investigated monthly from ...: The phytoplankton community structure, in terms of species composition, total standing crop, and abundance of the dominant algal species, at four stations in Donghu Lake, Wuhan, China, was investigated monthly from January 1994 to December 1996. A total of 260 taxa was observed, of which Chlorophyta (106 taxa) contributed the highest portion of the total number of taxa, followed by Bacillariophyta (82 taxa) and Cyanophyta (32 taxa). The total standing crop measured by means of chlorophyll a content, cell density, and cell biovolume, as well as the abundance of the dominant species, declined in the order of Station I to Station IV. Seasonal changes of the standing crop varied greatly among the four stations. Although the cell density at the four stations showed a single peak within a year, the peak density varied from July to November, dependent on the sampling year and the station. For chlorophyll a content and cell biovolume, multiple peaks were observed at Stations I and II, but a single peak was found at Stations III and IV. The phytoplankton community structure indicated that the trophic status was the highest at Station I (most eutrophic), followed by Station II; Stations III and IV were the least trophic areas. The long-term changes in phytoplankton community structure further suggested that changes in phytoplankton community structure were correlated with water quality, and eutrophication of Donghu Lake had been aggravated since the 1950s.展开更多
文摘There are only 21 species of benthonic animals in the Nanhu Lake,Changchun.The dominant species in the benthos community are obvious,and the individual quantity of Limnodrilus hoffmeisteri,Branchiura sowerbyi,and Tendipus plumosus accounts for 87% of the total individual quantity of all benthonic animals.It indicates that the water in the Nanhu Lake is suffering serious organic pollution,and belongs to an eutrophic lake.The peak values of benthos biomass and energy are found in July(48 23gWW·m -2 and 241 16kJ·m -2 respectively),while the maximum individual quantity is appeared in May(401ind·m -2 ).The distribution of Oligochaeta and aquatic insects has a significant positive correlation to organic content in the sediment(α<0 05).The community structure of benthonic animals reflects adequately the feature of the Nanhu Lake as an eutrophic lake in temperate zone.
文摘: The phytoplankton community structure, in terms of species composition, total standing crop, and abundance of the dominant algal species, at four stations in Donghu Lake, Wuhan, China, was investigated monthly from January 1994 to December 1996. A total of 260 taxa was observed, of which Chlorophyta (106 taxa) contributed the highest portion of the total number of taxa, followed by Bacillariophyta (82 taxa) and Cyanophyta (32 taxa). The total standing crop measured by means of chlorophyll a content, cell density, and cell biovolume, as well as the abundance of the dominant species, declined in the order of Station I to Station IV. Seasonal changes of the standing crop varied greatly among the four stations. Although the cell density at the four stations showed a single peak within a year, the peak density varied from July to November, dependent on the sampling year and the station. For chlorophyll a content and cell biovolume, multiple peaks were observed at Stations I and II, but a single peak was found at Stations III and IV. The phytoplankton community structure indicated that the trophic status was the highest at Station I (most eutrophic), followed by Station II; Stations III and IV were the least trophic areas. The long-term changes in phytoplankton community structure further suggested that changes in phytoplankton community structure were correlated with water quality, and eutrophication of Donghu Lake had been aggravated since the 1950s.
