生物多样性 ›› 2023, Vol. 31 ›› Issue (5): 22533.  DOI: 10.17520/biods.2022533

• 动物多样性 • 上一篇    下一篇

西藏那曲市高原盐湖自由生活线虫群落多样性与结构特征

张鹤露1,2, 赵美红1,2, 孙世春2,3, 刘晓收1,2,*()   

  1. 1.中国海洋大学海洋生命学院, 山东青岛 266003
    2.中国海洋大学海洋生物多样性与进化研究所, 山东青岛 266003
    3.中国海洋大学水产学院, 山东青岛 266003
  • 收稿日期:2022-09-18 接受日期:2022-11-28 出版日期:2023-05-20 发布日期:2023-05-23
  • 通讯作者: * E-mail: liuxs@ouc.edu.cn
  • 基金资助:
    西藏自治区科技计划项目(XZ202102YD0022C);西藏自治区科技计划项目(XZ201703-GB-04);国家自然科学基金(41976131)

Diversity and community characteristics of free-living nematodes in plateau salt lakes in Nagqu City, Tibet

Helu Zhang1,2, Meihong Zhao1,2, Shichun Sun2,3, Xiaoshou Liu1,2,*()   

  1. 1. College of Marine Life Sciences, Ocean University of China, Qingdao, Shandong 266003
    2. Institute of Evolution & Marine Biodiversity, Ocean University of China, Qingdao, Shandong 266003
    3. College of Fisheries, Ocean University of China, Qingdao, Shandong 266003
  • Received:2022-09-18 Accepted:2022-11-28 Online:2023-05-20 Published:2023-05-23
  • Contact: * E-mail: liuxs@ouc.edu.cn

摘要:

自由生活线虫作为良好指示物种, 在生态环境监测中具有较大应用潜力。研究青藏高原盐湖自由生活线虫对完善高原底栖生物群落和生态环境评估体系具有重要意义。本研究于2020年7-8月对中国西藏自治区那曲市其香错、达则错、依布茶卡等11个高原盐湖的自由生活线虫及其与环境因子的关系进行了分析。结果表明, 自由生活线虫总平均丰度为13.98 ± 22.21 ind./10 cm2, 高盐湖泊(32.31-49.85) (19.33 ± 29.99 ind./10 cm2)高于寡盐湖泊(0.64-4.70) (12.43 ± 4.18 ind./10 cm2)和中盐湖泊(10.20-11.82) (3.67 ± 0.73 ind./10 cm2)。共鉴定出自由生活线虫17科21属, 以ProcephalobusTrilobusMiranema等为优势属, 其中Procephalobus丰度最高, 占自由生活线虫总丰度的47.1%。自由生活线虫群落优势摄食类型为藻食者(59.7%), 其数量与初级生产力和硅藻丰度密切相关。高原盐湖间自由生活线虫丰度和群落结构差异主要与沉积物有机质含量、底层水盐度、沉积物含水量的空间变化有关; 盐度对自由生活线虫的丰度影响不显著, 而群落结构的差异则与盐度相关。研究区域自由生活线虫优势属与其他高盐地区存在差异, 这可能与气候特征、环境胁迫、人类扰动等因素有关, 有待于未来进一步研究证实。

关键词: 盐湖, 自由生活线虫, 多样性, 群落结构, 青藏高原

Abstract

Aim: Being considered effective indicator species, free-living nematodes have great application potential in ecological monitoring. Therefore, the study of free-living nematodes in the Tibetan Plateau salt lakes may be of great importance to improve the benthic communities and ecological environment assessment systems for plateau salt lakes. The aim of this study is to assess diversity and community structure of free-living nematodes.
Methods: Quantitative investigations of free-living nematodes and their relationships with environmental factors were conducted by collecting sediment samples in 11 plateau salt lakes, including Kyêbxang Co, Dagze Co and Yibug Caka etc. in Nagqu City, Tibet, China, from July to August 2020.
Results: Total average abundance of free-living nematodes was 13.98 ± 22.21 ind./10 cm2. The abundance of free-living nematodes in euhalines (32.31-49.85) (19.33 ± 29.99 ind./10 cm2) was higher than those in oligohalines (0.64-4.70) (12.43 ± 4.18 ind./10 cm2) and mesohalines (10.20-11.82) (3.67 ± 0.73 ind./10 cm2). A total of 21 genera, belonging to 17 families, of free-living nematodes were identified, with Procephalobus, Trilobus, Miranema as the dominant genera, among which Procephalobus was the most abundant, accounting for 47.1% of the total free-living nematode that were identified. The dominant feeding type of free-living nematodes were algal feeders (59.7%), which was closely related to the abundance of primary producers and diatom abundance.
Conclusion: Differences in free-living nematode abundance and community structure in the plateau salt lakes in Tibet were mainly related to spatial variations in sediment organic matter content, bottom water salinity, and sediment water content. Salinity had no significant effects on the abundance of free-living nematodes. However, differences in community structure were positively correlated to salinity. In addition, the most abundant genera in the study lakes were different when compared to other lakes with high salinity. This could possibly be due to specific climatic characteristics, environmental stress, and human disturbance in the site and should be confirmed with further studies.

Key words: salt lakes, free-living nematode, diversity, community structure, Tibetan Plateau