Environmental heterogeneity and productivity drive the assemblage of benthic diatom: a case study of the Three Gorges Reservoir

Songqi YANG; Tian OUYANG; Shaojun XU; Lu ZHAO; Lulu JI; Junqiong SHI; Zhongxing WU

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Environmental heterogeneity and productivity drive the assemblage of benthic diatom: a case study of the Three Gorges Reservoir

Ecology | Updated：2024-10-12

- Environmental heterogeneity and productivity drive the assemblage of benthic diatom: a case study of the Three Gorges Reservoir
- Environmental heterogeneity and productivity drive the assemblage of benthic diatom: a case study of the Three Gorges Reservoir
- 海洋湖沼学报(英文) 2023年41卷第3期页码：991-1006
- Affiliations：
  
  1.Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, School of Life Science, Southwest University, Chongqing 400715, China
  2.Gansu Microalgae Technology Innovation Center, Zhangye 734000, China
  3.College of Horticulture and Plant Protection, Henan University of science and Technology, Luoyang 471000, China
- Author bio：
  
  wuzhx@swu.edu.cn
- Funds：
  
  the National Natural Science Foundation of China(42177055;41877410);the Chongqing Postgraduate Scientific Research Innovation Project(CYS21106;CYS20105)
- DOI：
  中图分类号：
- 收稿：2021-11-23，
  
  纸质出版：2023-05-01
- Accepted：
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Environmental heterogeneity and productivity drive the assemblage of benthic diatom: a case study of the Three Gorges Reservoir[J]. 海洋湖沼学报(英文), 2023,41(3):991-1006.

YANG Songqi,OUYANG Tian,XU Shaojun,et al.Environmental heterogeneity and productivity drive the assemblage of benthic diatom: a case study of the Three Gorges Reservoir[J].Journal of Oceanology and Limnology,2023,41(03):991-1006.
Environmental heterogeneity and productivity drive the assemblage of benthic diatom: a case study of the Three Gorges Reservoir[J]. 海洋湖沼学报(英文), 2023,41(3):991-1006. DOI：

YANG Songqi,OUYANG Tian,XU Shaojun,et al.Environmental heterogeneity and productivity drive the assemblage of benthic diatom: a case study of the Three Gorges Reservoir[J].Journal of Oceanology and Limnology,2023,41(03):991-1006. DOI：

摘要

Abstract

Dam construction has a critical effect on river ecosystems in the world

resulting in a rapid decline in biodiversity and ecosystem health. However

the effect of dam construction on the assemblage pattern of benthic diatoms remains unclear. The benthic diatoms assemblages in the tributary backwater area of the Three Gorges Reservoir (TGR) were investigated under low water level (LWL) and high water level (HWL) conditions. Results show that

Discostella stelligera

Nitzschia palea

and

Craticula subminuscula

were dominant species in LWL

while

Achnanthidium minutissimum

and

Nitzschia dissipata

were dominant in HWL. Furthermore

environmental variables

productivity parameters

diversity indices

and community similarity were found significantly different between LWL and HWL periods.

The Mantel test indicated that both environmental and spatial factors had significant effects on diatom communities in backwater area

while productivity was also a key driving force in LWL. The variation partitioning analysis (VPA) further demonstrated that environment factors could explain the largest variance of diatom assemblages in HWL (9%) and LWL (11%)

followed by spatial factors. The relative importance of productivit

y to diatom community was significantly enhanced in LWL

but only a slight effect was found in HWL. These results indicate that the diatom assemblages were shaped by both environmental filtering and spatial factors. The relative importance of spatial factors depended on the degree of productivity. Therefore

the homogenization of diatom communities due to environmental disturbance

e.‍g. eutrophication and dam building

is the underlying mechanism in assembling the benthic diatoms.

关键词

Keywords

references

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