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Polar lakes may act as ecological islands to aquatic protists.

Rengefors, Karin LU ; Logares, Ramiro LU and Laybourn-Parry, J (2012) In Molecular Ecology 21(13). p.3200-3209
Abstract
A fundamental question in ecology is whether microorganisms follow the same patterns as multicellular organisms when it comes to population structure and levels of genetic diversity. Enormous population sizes, predominately asexual reproduction and presumably high dispersal because of small body size could have profound implications on their genetic diversity and population structure. Here, we have analysed the population genetic structure in a lake-dwelling microbial eukaryote (dinoflagellate) and tested the hypothesis that there is population genetic differentiation among nearby lake subpopulations. This dinoflagellate occurs in the marine-derived saline lakes of the Vestfold Hills, Antarctica, which are ice-covered most of the year.... (More)
A fundamental question in ecology is whether microorganisms follow the same patterns as multicellular organisms when it comes to population structure and levels of genetic diversity. Enormous population sizes, predominately asexual reproduction and presumably high dispersal because of small body size could have profound implications on their genetic diversity and population structure. Here, we have analysed the population genetic structure in a lake-dwelling microbial eukaryote (dinoflagellate) and tested the hypothesis that there is population genetic differentiation among nearby lake subpopulations. This dinoflagellate occurs in the marine-derived saline lakes of the Vestfold Hills, Antarctica, which are ice-covered most of the year. Clonal strains were isolated from four different lakes and were genotyped using amplified fragment length polymorphism (AFLP). Our results show high genetic differentiation among lake populations despite their close geographic proximity (<9 km). Moreover, genotype diversity was high within populations. Gene flow in this system is clearly limited, either because of physical or biological barriers. Our results discard the null hypothesis that there is free gene flow among protist lake populations. Instead, limnetic protist populations may differentiate genetically, and lakes act as ecological islands even on the microbial scale. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Antarctica, biogeography, dinoflagellates, genetic diversity, population genetics, protists
in
Molecular Ecology
volume
21
issue
13
pages
3200 - 3209
publisher
Wiley-Blackwell
external identifiers
  • wos:000305582200010
  • pmid:22564188
  • scopus:84862755691
ISSN
0962-1083
DOI
10.1111/j.1365-294X.2012.05596.x
project
BECC
language
English
LU publication?
yes
id
fd093123-33d3-435d-82e4-a5cbf765de9c (old id 2609040)
date added to LUP
2012-06-11 14:18:58
date last changed
2017-01-08 03:04:20
@article{fd093123-33d3-435d-82e4-a5cbf765de9c,
  abstract     = {A fundamental question in ecology is whether microorganisms follow the same patterns as multicellular organisms when it comes to population structure and levels of genetic diversity. Enormous population sizes, predominately asexual reproduction and presumably high dispersal because of small body size could have profound implications on their genetic diversity and population structure. Here, we have analysed the population genetic structure in a lake-dwelling microbial eukaryote (dinoflagellate) and tested the hypothesis that there is population genetic differentiation among nearby lake subpopulations. This dinoflagellate occurs in the marine-derived saline lakes of the Vestfold Hills, Antarctica, which are ice-covered most of the year. Clonal strains were isolated from four different lakes and were genotyped using amplified fragment length polymorphism (AFLP). Our results show high genetic differentiation among lake populations despite their close geographic proximity (&lt;9 km). Moreover, genotype diversity was high within populations. Gene flow in this system is clearly limited, either because of physical or biological barriers. Our results discard the null hypothesis that there is free gene flow among protist lake populations. Instead, limnetic protist populations may differentiate genetically, and lakes act as ecological islands even on the microbial scale.},
  author       = {Rengefors, Karin and Logares, Ramiro and Laybourn-Parry, J},
  issn         = {0962-1083},
  keyword      = {Antarctica,biogeography,dinoflagellates,genetic diversity,population genetics,protists},
  language     = {eng},
  number       = {13},
  pages        = {3200--3209},
  publisher    = {Wiley-Blackwell},
  series       = {Molecular Ecology},
  title        = {Polar lakes may act as ecological islands to aquatic protists.},
  url          = {http://dx.doi.org/10.1111/j.1365-294X.2012.05596.x},
  volume       = {21},
  year         = {2012},
}