Journal of Dalian Ocean University  2023, Vol. 38 Issue (3): 504-514 DOI: |
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| Aquatic biodiversity and water quality evaluation in the Daluoquangou River |
| ZHAO Chen，SUN Jiawei，YIN Zengqiang，WANG Huibo，WANG Le，SONG Dan，DU Xue，ZHAO Yucai，SUN Yang，HUO Tangbin*
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| 1.Key Laboratory of Aquatic Organism Protection and Ecological Restoration in Cold Waters，Heilongjiang River Fisheries Research Institute，Chinese Academy of Fishery Sciences，Harbin 150070，China；2.College of Marine Science and Environment，Dalian Ocean University，Dalian 116023，China；3.Tonghua County Agricultural and Rural Bureau，Tonghua 134100，China |
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Abstract In order to explore the relationship between the distribution characteristics of aquatic communities and environmental factors in the provincial aquatic germplasm reserve for endemic fish of the Daluoquangou River, community structure characteristics of fish, phytoplankton, zooplankton and macrozoobenthos, and the physicochemical factors of the water environment were investigated. A total of 14 sampling sites were set up in the Daluoquangou River and its tributaries from May to June 2021. The results showed that 25 fish species, belonging to six orders and eight families were identified, and the dominant species were all cold-water fish. The species richness of fish in the main stream was higher than that in the tributaries, and the biodiversity in the experimental area was higher than that in the core area. 39 species of phytoplankton, belonging to four phyla were identified, and Bacillariophyta was the dominant taxa. There were significant differences in species evenness index between the core area and the experimental area (P<0.05). The phytoplankton biomass was spatially heterogeneous, and the abundance and biomass of phytoplankton was the highest in the experimental area. A total of 32 zooplankton species, belonging to four categories were identified. Rotifer were the dominant taxa, and the abundance and biomass of zooplankton were the highest in the experimental area. A total of 26 species of macrozoobenthos, belonging to two phyla, two classes, six orders, 18 families, were identified. Aquatic insects were the dominant taxa, and the dominant species were Ephemeroptera and Trichoptera that liked clean water. The density and biomass of macrozoobenthos in the core area was the highest. The results of Non-metric multidimensional scaling showed that the Pseudorasbora parva, Merismopedia minima, Inocalanus dorrii, and Epeorus sp. were the indicator species that caused the differences in aquatic community structure among groups, respectively. Conductivity was the significantly environmental factor affecting fish community, and water temperature, ammonia nitrogen and permanganate index, and water temperature and pH, were the significantly environmental factors affecting phytoplankton and macroinvertebrate communities, respectively. The results indicated that the water quality of the Daluoquangou River was clean, and the trophic status was oligotrophic to mesotrophic.Aquatic biodiversity of the experimental area was higher than that of core area. Large-scale natural habitat changes and hydrological characteristics were the main factors affecting the structure of aquatic communities in the Daluoquangou River.
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Published: 12 July 2023
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