Effects of hydrological connection and human disturbance on genetic variation of submerged<italic style="font-style: italic">Vallisneria natans</italic>populations in four lakes in China

Qianjin CAO; Beibei LIU; Feiyang HU

doi:10.1007/s00343-020-0277-1

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Effects of hydrological connection and human disturbance on genetic variation of submergedVallisneria natanspopulations in four lakes in China

Updated：2023-05-20

- Effects of hydrological connection and human disturbance on genetic variation of submergedVallisneria natanspopulations in four lakes in China
- Journal of Oceanology and Limnology Vol. 39, Issue 4, Pages: 1403-1416(2021)
- Affiliations：
  
  Institute of Evolution and Ecology, School of Life Sciences, Central China Normal University, Wuhan 430079, China
- Author bio：
  
  Qianjin CAO, E-mail:caoqj1009@163.com,caoqj1009@ccnu.edu.cn
- Funds：
- DOI：10.1007/s00343-020-0277-1
  CLC：
- Received：17 July 2020，
  
  Accepted：23 September 2020，
  
  Online First：02 November 2020，
  
  Published：2021-07
- Accepted：
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Qianjin CAO, Beibei LIU, Feiyang HU. Effects of hydrological connection and human disturbance on genetic variation of submergedVallisneria natanspopulations in four lakes in China[J]. Journal of Oceanology and Limnology, 2021, 39(4): 1403-1416.
DOI：

Qianjin CAO, Beibei LIU, Feiyang HU. Effects of hydrological connection and human disturbance on genetic variation of submergedVallisneria natanspopulations in four lakes in China[J]. Journal of Oceanology and Limnology, 2021, 39(4): 1403-1416. DOI： 10.1007/s00343-020-0277-1.

摘要

Abstract

With the increase in the need for flood prevention and lake resource used by humans

the construction of floodgates and sluices has changed the hydrological connection between rivers and lakes

and between adjacent lakes. In river-disconnected lakes

exploitation and use of lake resources have resulted in water quality decline and mechanical disturbance intensification to a different degree. Of the large number of river-disconnected lakes in the middle-lower reaches of the Changjiang (Yangtze) River

the Futou Lake

and the Xiliang Lake lie close together and are

historically

directly connected

and so do Liangzi Lake and Baoan Lake. The extent of human disturbance is severe in the Futou Lake and the Baoan Lake

but relatively mild in the Xiliang Lake and Liangzi Lake. The freshwater rosette-forming submerged plant

Vallisneria natans

is one of the dominant species in the four lakes. Using microsatellite markers

we studied the genetic variation of

V. natans

subpopulations in lakes with different intensities of human disturbance and historical direct hydrological connections. Our results showed that human disturbance decreased plant density and clonal growth in

V. natans

but might increase genetic and clonal diversity at a subpopulation level and enhance gene flow among subpopulations by sexual propagule movement. Under similar climatic conditions

different intensities of disturbance seem to have such a high selective potential to differentiate genetically adjacent lake populations that they outperform the forces of gene flow through historical direct hydrological interconnection

which tends to produce genetic homogeneity. Our findings imply that human disturbance has a profound effect on the evolutionary process of natural populations of submerged plants. Moreover

increased subpopulation genetic diversity can enhance resistance and resilience to environmental disturbances. To a certain degree

we could expect that disturbed populations have the possibility of restoring spontaneously if humans cease to perturb natural ecosystems in the future.

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Effects of hydrological connection and human disturbance on genetic variation of submergedVallisneria natanspopulations in four lakes in China

DOI：10.1007/s00343-020-0277-1

摘要

Abstract

关键词

Keywords

references