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Characteristics of Planton Community Structure between Maqu and Hukou in the Main Strem of Yellow River

Author: ZhangJunYan
Tutor: YangXingZhong
School: Northwestern University
Course: Ecology
Keywords: The upper reaches of the Yellow River Phytoplankton Zooplankton Community structure
CLC: Q178
Type: Master's thesis
Year: 2009
Downloads: 151
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Abstract


Have great significance in the study plankton community production of fisheries and freshwater ecology science basic theory. Less plankton community structure of the upper reaches of the Yellow River, especially the systematic study of the plankton community of Maqu to Hukou section of the Yellow River is less this reason, 2006 to May, and 7 to 8 the number of months in the watershed plankton species composition, species composition analysis (including density and biomass), the dominant species, biodiversity research, the main results of the study are as follows: 1.1 phytoplankton community structure 1.1.1 Total detection of phytoplankton 5 27 species (genus), Bacillariophyta (BACILLARIOPHYTA) 14 (genus); the Chlorophyta (Chlorophyta) 5 (L.); the Cyanophyta (Cyanophyta) 4 (the case); Euglenophyta (Euglenophyta) 2 species (genus): cryptalgal door (Cryptophyta), Pyrrophyta (Pyrrophyta) each. The modest phytoplankton species composition changes at each sampling point, the absolute advantage are diatoms, green algae, followed by; phytoplankton composition did not change significantly in summer. 1.1.2 phytoplankton density range of 3.2 × 10 4 cells · L -1 ~ 54.3 × 10 4 cells · L -1 , the average density of 17.3 × 10 4 cells · L -1 , phytoplankton biomass ranged from 0.061mg · L -1 ~ 0.44mg · L -1 , the average biomass of 0.25mg · L -1 . Spring, summer density and biomass did not change significantly. 1.1.3 the dominant species of phytoplankton: different poles algae (Gomphonema sp.), The needle bar algae (Synedra sp.), Navicula (Navicula sp.), Nitzschia (Nitzsschia closterium),, bridge akashiwo (Gymbella sp.) ; crescent algae (Closteriumsp.). 1.1.4 integrated several index comprehensive evaluation of water quality in the basin was slightly polluted. 1.1.5 spring and summer, phytoplankton density, biomass and altitude were negatively correlated that with the rise of the altitude, the density of phytoplankton biomass downward trend. 1.2 zooplankton community structure 1.2.1 zooplankton of two 18 species (genus). Protozoa (Protozoa) 13 (genus), accounting for 72.2% of the total number of zooplankton Wheels phylum (Rotifer) 5 (genus), accounting for 27.8%. Protozoan species composition in the spring, summer, occupied the absolute advantage. 1.2.2 zooplankton density range: 670cells · L -1 ~ 1420 cells · L -1 , the average density is 936.27 cells · L -1 . ; biomass range: 0.044mg · L -1 to 0.98 mg · L -1 , the average biomass of 0.16mg · L -1 . Density and biomass in the spring and summer change is obvious. 1.2.3 dominant species of zooplankton the protozoan door: the amoeba (, Amoeba Style), sand shell insects (Diffusion). 1.2.4 Maqu to the Yellow River Hukou paragraph zooplankton community structure is unstable, susceptible to external environmental interference. 1.2.5 spring, summer, zooplankton density, biomass and the altitude was a negative correlation between the downward trend that with the rise of the altitude, the density of phytoplankton biomass. In summary, the Maqu to Hukou section of the Yellow River plankton species composition and community structure of a single, lead to lower species diversity; plankton standing crop and the altitude was negatively correlated; integrated several index to evaluate water quality After the draw, the watershed and water quality is slightly polluted. This paper systematically studied the Maqu to Hukou section of the Yellow River plankton community structure, and provide the basis of the theoretical basis for further study of the aquatic ecosystem of the basin later.

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CLC: > Biological Sciences > General Biology > Hydrobiology > Aquatic organisms, ecology and geography
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