Distribution patterns of benthic diatoms during summer in the Niyang River, Tibet, China

Guofeng Pei; Guoxiang Liu

doi:10.1007/s00343-011-0291-4

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Distribution patterns of benthic diatoms during summer in the Niyang River, Tibet, China

Updated：2023-05-16

- Distribution patterns of benthic diatoms during summer in the Niyang River, Tibet, China
- Journal of Oceanology and Limnology Vol. 29, Issue 6, Pages: 1192-1198(2011)
- Affiliations：
  
  1. Key Laboratory for Microorganism and Biotransformation South-Central University for Nationalities
  2. State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences
- Author bio：
- Funds：
- DOI：10.1007/s00343-011-0291-4
  CLC：
- Online First：25 October 2011，
  
  Published：2011
- Accepted：
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Pei, G., Liu, G. Distribution patterns of benthic diatoms during summer in the Niyang River, Tibet, China., Chin. J. Ocean. Limnol. 29, 1192–1198 (2011). https://doi.org/10.1007/s00343-011-0291-4
DOI：

Pei, G., Liu, G. Distribution patterns of benthic diatoms during summer in the Niyang River, Tibet, China., Chin. J. Ocean. Limnol. 29, 1192–1198 (2011). https://doi.org/10.1007/s00343-011-0291-4 DOI：

摘要

Abstract

The aim of this study was to investigate the distribution

density

community structure and biodiversity characteristics of benthic diatoms

and to analyze whether differences in species composition and abundance exist in different regions of the Niyang River

Tibet. Among the 157 taxa observed in 15 sampling sites in the main river and tributary

most were casual species (>100)

the relative abundance of the genera Achnanthes and Fragilaria was 67% of the total relative abundance. Achnanthes minutissima was the most important species and dominated the whole river reaches (average relative abundance was 30%); the average diatom densities were 7.4 × 105 cell/cm2 at all sites

and increased slowly from the upper section to downriver. The significant indicator taxa with higher relative abundance were Achnanthes biasolettiana (18.0%) and Fragilaria arcus (18.2%)

Fragilaria capucina var. vaucheriae (31.2%)

Fragilaria construens var. venter (11.3%) and Cymbella affinis (11.0%) in the upper

tributary and mid-river sections

respectively. Achnanthes minutissima was the most abundant species (56%) in the downriver section. Biodiversity indices showed a gradual decrease from the up- to down-river section

and dominant species were more abundant in the upper and mid-river sections than in the downriver section. A two-way indictor species analysis (TWINSPAN) of diatom composition clearly showed four different groups

namely the upper

mid

lower and tributary sections. Detrended correspondence analysis (DCA) supported the results of TWINSPAN

and the characteristics of site distribution and species composition in the Niyang River supported the spatial structure of diatom assemblages. This study indicates that bio-assessment programs utilizing benthic diatoms could clearly benefit lotic water with regional stratification.

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