

FOLLOWUS
Institute of Evolution and Ecology, School of Life Sciences, Central China Normal University, Wuhan 430079, China
caoqj1009@ccnu.edu.cn; caoqj1009@163.com
Received:16 April 2024,
Online First:12 June 2024,
Published:01 May 2025
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CAO Wanhui,WANG Qian,CAO Qianjin.Fine-scale spatial genetic structure and gene dispersal in lake populations of submerged species[J].Journal of Oceanology and Limnology,2025,43(03):831-847.
CAO Wanhui,WANG Qian,CAO Qianjin.Fine-scale spatial genetic structure and gene dispersal in lake populations of submerged species[J].Journal of Oceanology and Limnology,2025,43(03):831-847. DOI: 10.1007/s00343-024-4111-z.
To assess the population development of submerged plant species in disturbed lake ecosystems
we need to better understand the genetic diversity and spatial genetic structure at a fine scale
as well as the impact of disturbances on the populations. Caohai Lake
in southwest China
is a suitable natural sampling lake because of its abundance of submerged plants and the intense human disturbance. Three widely distributed species
Potamogeton
lucens
Ceratophyllum
demersum
and
Myriophyllum
spicatum
were sampled; the spatial position of e
ach individual was recorded in two-dimensional coordinates; and the species were analyzed genetically using microsatellite markers. Among the species studied
M
.
spicatum
exhibited the highest genetic and clonal diversities. All
P
.
lucens
subpopulations but one showed a significant fine-scale spatial genetic structure (FSGS)
which may result from the limited gene dispersal. However
M
.
spicatum
and
C
.
demersum
with a relatively large distance of gene dispersal
had no significant FSGS. The FSGS pattern of
P
.
lucens
at the dock site with intense boat disturbance was significantly different from that at other sites. Our results imply that the FSGS of submerged plants is affected by many factors including seed dispersal
vegetative reproduction and disturbance from birds and boats. Most subpopulations of the three species had
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3.47133350
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9.48266602
values gr
eater than one
implying that the sexual dispersal contributes more than vegetative dispersal to total gene dispersal. Therefore
it is worth paying attention to the importance of seed dispersal for population development of submerged plants in lake ecosystems.
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