Chinese Journal of Oceanology and Limnology

, Volume 35, Issue 3, pp 489–500

Spatio-temporal variability of periphytic protozoa related to environment in the Niyang River, Tibet, China

  • Haiping Liu (刘海平)
  • Shaowen Ye (叶少文)
  • Xuefeng Yang (杨学峰)
  • Chuanbo Guo (郭传波)
  • Huijuan Zhang (张惠娟)
  • Liqing Fan (范丽卿)
  • Liangsong Zhang (张良松)
  • Lek Sovan
  • Zhongjie Li (李钟杰)
Biology

DOI: 10.1007/s00343-017-5274-7

Cite this article as:
Liu, H., Ye, S., Yang, X. et al. Chin. J. Ocean. Limnol. (2017) 35: 489. doi:10.1007/s00343-017-5274-7

Abstract

The Niyang River, a main tributary of the Yarlung Zangbo River, is an important and typical plateau river ecosystem in Tibet, China. At present, few studies have focused on its aquatic living resources and river ecology. In this study, the composition, abundance, and diversity of periphytic protozoa were investigated across four seasons from 2008 to 2009 to better understand their spatio-temporal patterns and relationship to the environment. Our investigation shows that periphytic protozoa in the Niyang River contained 15 genera, belonged to Tubulinea, Alveolata, Discosea and Rhizaria, Alveolata possessed most genera, up to nine, with highest share in abundance, exceeding 50%, Difflugia and Glaucoma were dominant genera. Moreover, four diversity indices of periphytic protozoa, including species richness, total abundance, Shannon-Wiener diversity index and Pielou’s evenness index, displayed a significant descending trend as the seasons continued, in the order of winter, spring, summer and autumn; with a significant difference existing between winter and summer (or autumn) for Shannon-Wiener diversity index and species richness (P<0.05). Four of these diversity indices also presented a V-shaped pattern between the upper middle course of the Niyang River and the confluence of the Niyang River and Yarlung Zangbo River, with the lowest value occurred in the middle course of the Niyang River. However, no significant variation was found through the Niyang River (P>0.05). In addition, canonical correlation analysis (CCA) shows that the densities of Difflugia, Glaucomais, Enchelydium, Cyphoderia, and Enchelys correlate with water temperature, alkalinity, hardness, pH, and dissolved oxygen, respectively. Lastly, the relationship between periphytic protozoa diversity and the environmental factors of the Niyang River can be predicted using classification and regression trees (CART) annalysis, which suggests that the total abundance and Shannon-Wiener diversity index would be higher when the elevation is above 3 308 m. On the other hand, the Shannon-Wiener diversity index and Pielou’s evenness index would be lower when pH and ammoniacal nitrogen have lower or higher values. Finally yet importantly, close attention should be paid to periphytic protozoa and its environment to ensure sustainable development of the Niyang River ecosystem.

Keywords

Tibetan Plateau Niyang River periphytic protozoa environment spatio-temporal dynamic 

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Copyright information

© Chinese Society for Oceanology and Limnology, Science Press and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Haiping Liu (刘海平)
    • 1
    • 2
    • 3
  • Shaowen Ye (叶少文)
    • 1
  • Xuefeng Yang (杨学峰)
    • 4
  • Chuanbo Guo (郭传波)
    • 1
  • Huijuan Zhang (张惠娟)
    • 3
  • Liqing Fan (范丽卿)
    • 3
  • Liangsong Zhang (张良松)
    • 5
  • Lek Sovan
    • 6
  • Zhongjie Li (李钟杰)
    • 1
  1. 1.State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of HydrobiologyChinese Academy of SciencesWuhanChina
  2. 2.University of Chinese Academy of SciencesBeijingChina
  3. 3.Agricultural and Animal Husbandry College of Tibet UniversityLinzhiChina
  4. 4.Xilinhot No.6 Middle SchoolXilinhotChina
  5. 5.Fujian Marine Products Technical Promotion StationFuzhouChina
  6. 6.UMR 5174 EDBCNRS-University Paul SabatierToulouseFrance

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