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A planktonic diatom displays genetic structure over small spatial scales

Sefbom, Josefin; Kremp, Anke; Rengefors, Karin LU ; Jonsson, Per R.; Sjöqvist, Conny and Godhe, Anna (2018) In Environmental Microbiology 20(8). p.2783-2795
Abstract

Marine planktonic microalgae have potentially global dispersal, yet reduced gene flow has been confirmed repeatedly for several species. Over larger distances (>200 km) geographic isolation and restricted oceanographic connectivity have been recognized as instrumental in driving population divergence. Here we investigated whether similar patterns, that is, structured populations governed by geographic isolation and/or oceanographic connectivity, can be observed at smaller (6–152 km) geographic scales. To test this we established 425 clonal cultures of the planktonic diatom Skeletonema marinoi collected from 11 locations in the Archipelago Sea (northern Baltic Sea). The region is characterized by a complex topography, entailing... (More)

Marine planktonic microalgae have potentially global dispersal, yet reduced gene flow has been confirmed repeatedly for several species. Over larger distances (>200 km) geographic isolation and restricted oceanographic connectivity have been recognized as instrumental in driving population divergence. Here we investigated whether similar patterns, that is, structured populations governed by geographic isolation and/or oceanographic connectivity, can be observed at smaller (6–152 km) geographic scales. To test this we established 425 clonal cultures of the planktonic diatom Skeletonema marinoi collected from 11 locations in the Archipelago Sea (northern Baltic Sea). The region is characterized by a complex topography, entailing several mixing regions of which four were included in the sampling area. Using eight microsatellite markers and conventional F-statistics, significant genetic differentiation was observed between several sites. Moreover, Bayesian cluster analysis revealed the co-occurrence of two genetic groups spread throughout the area. However, geographic isolation and oceanographic connectivity could not explain the genetic patterns observed. Our data reveal hierarchical genetic structuring whereby despite high dispersal potential, significantly diverged populations have developed over small spatial scales. Our results suggest that biological characteristics and historical events may be more important in generating barriers to gene flow than physical barriers at small spatial scales.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Environmental Microbiology
volume
20
issue
8
pages
13 pages
publisher
Wiley-Blackwell
external identifiers
  • scopus:85053613666
ISSN
1462-2912
DOI
10.1111/1462-2920.14117
language
English
LU publication?
yes
id
b43bb043-1c3f-4481-b7aa-a567b2f260af
date added to LUP
2018-10-18 10:45:40
date last changed
2019-07-21 05:09:36
@article{b43bb043-1c3f-4481-b7aa-a567b2f260af,
  abstract     = {<p>Marine planktonic microalgae have potentially global dispersal, yet reduced gene flow has been confirmed repeatedly for several species. Over larger distances (&gt;200 km) geographic isolation and restricted oceanographic connectivity have been recognized as instrumental in driving population divergence. Here we investigated whether similar patterns, that is, structured populations governed by geographic isolation and/or oceanographic connectivity, can be observed at smaller (6–152 km) geographic scales. To test this we established 425 clonal cultures of the planktonic diatom Skeletonema marinoi collected from 11 locations in the Archipelago Sea (northern Baltic Sea). The region is characterized by a complex topography, entailing several mixing regions of which four were included in the sampling area. Using eight microsatellite markers and conventional F-statistics, significant genetic differentiation was observed between several sites. Moreover, Bayesian cluster analysis revealed the co-occurrence of two genetic groups spread throughout the area. However, geographic isolation and oceanographic connectivity could not explain the genetic patterns observed. Our data reveal hierarchical genetic structuring whereby despite high dispersal potential, significantly diverged populations have developed over small spatial scales. Our results suggest that biological characteristics and historical events may be more important in generating barriers to gene flow than physical barriers at small spatial scales.</p>},
  author       = {Sefbom, Josefin and Kremp, Anke and Rengefors, Karin and Jonsson, Per R. and Sjöqvist, Conny and Godhe, Anna},
  issn         = {1462-2912},
  language     = {eng},
  number       = {8},
  pages        = {2783--2795},
  publisher    = {Wiley-Blackwell},
  series       = {Environmental Microbiology},
  title        = {A planktonic diatom displays genetic structure over small spatial scales},
  url          = {http://dx.doi.org/10.1111/1462-2920.14117},
  volume       = {20},
  year         = {2018},
}