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Scientia Silvae Sinicae ›› 2022, Vol. 58 ›› Issue (1): 78-88.doi: 10.11707/j.1001-7488.20220109

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Spatio-Temporal Niche of Dominant Protozoa Species in the Midstream and Downstream

Peng Zhang,Yang Liu,Ruizhi An,Nanqian Qiao,Zhen Da,Sang Ba*   

  1. Laboratory of Wetland and Catchments Ecology in Tibetan Plateau, Faculty of Natural Sciences, Tibet University Lhasa 850000
  • Received:2021-02-03 Online:2022-01-25 Published:2022-03-08
  • Contact: Sang Ba

Abstract:

Objective: This study aims to explore the temporal niche, spatial niche and spatio-temporal niche of dominant species of protozoa in the midstream and downstream of Lhasa River, and reveal the resource utilization status of dominant protozoa species and the relationship with to environmental factors, which provide a basis for further study on the interspecific interaction of protozoa communities and the adaptive mechanisms of protozoan to environmental change. Method: According to the characteristics of water enviroment in the midstream and downstream of Lhasd River, a total of 153 water samples were collected with plankton nets (aperture: 64 μm) at the seventeen sites in the midstream and downstream of Lhasa River in May, August 2015 and November 2016. We analysed replacement rate, niche width, niche overlap, ecological response rate and studied the niche of dominant protozoan species and the relationship with environmental factors through correlation analysis, redundancy analysis, cluster analysis and other method. Result: A total of 197 species of protozoa were identified, belonging to 2 phyla, 5 classes, 20 orders, 48 families and 75 genera, among which there were 5 dominant species of protozoa belonging to 2 phyla and 5 genera. The temporal niche width of dominant species is 0.378-0.695, the spatial niche width is 0.071-0.354, and the spatio-temporal niche width is 0.027-0.246. The dominant species have mainly low overlap in temporal niche, spatial niche and spatio-temporal niche. The sum of temporal ecological response rate of dominant species was 0.449, the sum of spatial ecological response rate was -6.972 and the sum of spatial and temporal ecological response rate was -0.107. The redundancy analysis showed that the water temperature significantly affected the distribution of protozoa dominant species in the lower reaches, and dissolved oxygen and total phosphorus significantly affected the distribution of dominant species in the midstream of Lhasa River. Conclusion: There are seasonal and regional differences of dominant species of protozoa, that temporal, spatial and spatio-temporal niche width and niche overlap is low in midstream and downstream of Lhasa River. The dominant species of protozoa were sensitive to changes in the water environment, and their distribution is significantly effected by the water environment. The protozoan community ecosystem was relatively fragile.

Key words: Lhasa River, protozoa, dominant species, ecological niche, ecological response rate, Tibet

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