|Spring Phytoplankton Community Structure and Niche Analysis of Dominant Species in Chishui River
|中文关键词:赤水河 浮游植物 优势种 生态位 群落结构
|英文关键词:Chishui River phytoplankton dominant species ecological niche community structure
| Chishui River comprises the important part of the national nature reserve for rare and endemic fish in the upper reaches of the Yangtze River. The understanding of the relationship between phytoplankton species will provide reference for the conservation and management of ecological environment of Chishui River. In this study, phytoplankton community structure and dominant species niche were analyzed based on the survey of phytoplankton in Chishui River from 2011 to 2016. The law of phytoplankton community changes in spring, the niche differentiation of dominant species and their environmental adaptability were revealed to provide basic data for the study of the characteristics of the phytoplankton community structure in the Chishui River. The sampling of phytoplankton for quantitative and qualitative analysis was carried out at four transects on the stem of the Chishui River in spring from March to May. During the investigation, a total of 233 phytoplankton species (variants) from 68 genera and 7 phyla were collected in Chishui River , with the absolute dominance of Bacillariophyta (142 species), accounting for more than 60.51%. During 2011 to 2016, the number of collected phytoplankton in each year was 105, 105, 100, 122, 132 and 133, respectively. The phytoplankton density fluctuated between (17.28-136.68)×104 cells/L. There was no significant difference in the inter-annual phytoplankton density between survey sections, while the temporal heterogeneity of phytoplankton community composition was more obvious than the spatial heterogeneity. The decomposition of temporal and spatial variance shows that temporal variability explained 24.5% of the total variability, while spatial variability only explained 2%. Based on the evaluation of the phytoplankton diversity indices, Chishui River was in a light or no pollution state in 2014 and 2016, and it was moderately affected by humans from 2011 to 2013 and in 2015. A total of 31 dominant species (variants) occurred in Chishui River in spring during 2011-2016.The dominant species of phytoplankton in Chishui River were primarily broad niche breadth species and moderate niche?breadth species. The average niche overlap index of dominant species was the highest among species in the same category and the minimum among species in different categories. Our research shows that phytoplankton in the Chishui River had a strong adaptability to the changes of the water environment in spring.
|魏 秘,朱爱民,王 瑞,胡菊香.2022.赤水河春季浮游植物群落结构变化及其优势种生态位分析[J].水生态学杂志,43(5):49-58.
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