Banqiao Reservoir Aquatic Community Structure Research

Investigation of a year of Banqiao reservoir in three sections, including plankton and benthic animals. Study on the classification of plankton and benthos, density and biomass, seasonal variation and spatial variation of density and biomass. Analysis of Banqiao reservoir of plankton community structure and seasonal diversity and space diversity, the results are as follows: 1 The Banqiao reservoir phytoplankton community structureBanqiao reservoir a total of 48 species, belonging to 6 phyla. Among them, 22 species were Chlorophyta,accounting for 45.8% of the number of species; 10 species were bacillariophyta,accounting for 20.8% of the number of species; Cyanophyta 8 species accounted for 16.7% of the number of species; 2 species of Pyrrophyta, accounting for 6.2% of species,respectively, and the thin mainly dinoflagellates peridinium Gymnodinium; Euglenophyta 2 anumber of species, accounting for 4.2%, respectively, Euglenophyta Trachelomonas flat; 2 Cryptophyta species, accounting for 4.2% of the number of species, respectively, the tip of the tail, the alga Cryptomonas ovata. Algae density and biomass of zooplankton showedobvious seasonal dynamic characteristics and similar. The phytoplankton density was highest in summer(July 9581 ind./ml),autumn began to decline, the average density of the lowest in winter(2108ind./ml), the spring began to rise again;biomass was highest in autumn(November average biomass of winter 128.6mg/L), decreased significantly, the lowest in spring and summer(40.2mg/L) increased significantly. Each sampling point of the average density of phytoplankton changed in the range of 2935.3-11412.5ind./L, the range of biomass was 21.5-193.3mg/L. Changes in the abundance and biomass of main and water temperatureand light intensity, and the biological characteristics of the phytoplankton is consistent, phytoplankton are the primary producers of natural water, as the water temperature rise, its growth and the reproduction speed. 2 The Banqiao reservoir planktonic animal community structureBanqiao reservoir were identified in 19 animal species: 4 species of Cladocera species,accounting for 21.1% of the total; 5 species of copepod species, accounting for 26.3% of the total; 7 species of Rotifera species, accounted for 36.8%; protozoa found 3 species,accounted for 15.8%. The density and biomass of planktonic animal showed significant andsimilar seasonal dynamics characteristics. Animaldensity and biomass were highest in summer(July average for each sampling point are respectively 22.6ind./ml and 10.1mg/L),autumn(November) of abundance and biomass began to decrease in winter(January), the density and biomass of planktonic animal reservoir had the lowest values found in each sampling point sampling, the average were 8.1ind./ml and 40.2mg/L, the amount ofabundance and biomass of phytoplankton in spring began to rise again. The abundance and biomass with the change of the phytoplankton abundance and biomass changes,environmental factors, mainly temperature and dissolved oxygen had a certain influence onthe population, and with the temperature and dissolved oxygen level, the population will increase. 3 The Banqiao reservoir benthic animal community structureBanqiao reservoir annual surveys were collected from the benthic animal 8 species,belonging to three categories, including 3 species of Oligochaeta, 3 species of animalsoftware, 2 kinds of aquatic insects. Abundance and biomass of benthic animal variation range of each sampling point were 32-256 /m2 and 3.4-1728.5mg/m2. Differences in differentsampling points is larger, on average the Banqiao reservoir benthic animals, there was a seasonal variation of density and biomass of benthic animals, the average density and biomass were highest in autumn and spring low density, biomass was the lowest in summer.