Polar lakes may act as ecological islands to aquatic protists.

Molecular Ecology
Karin RengeforsJohanna Laybourn-Parry

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 (<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. ...Continue Reading

Associated Datasets

References

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Feb 26, 2008·Environmental Microbiology·Ramiro LogaresKarin Rengefors
Jan 24, 2009·Protist·Ramiro LogaresKarin Rengefors
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Citations

Dec 21, 2012·The ISME Journal·Ramiro LogaresStefan Bertilsson
Dec 19, 2013·PloS One·Karen LebretKarin Rengefors
Apr 1, 2014·Extremophiles : Life Under Extreme Conditions·Loubna TaziKeith A Crandall
Jul 22, 2014·Environmental Microbiology·Karin RengeforsRebecca J Gast
May 8, 2015·Biology Letters·Josefin SefbomAnna Godhe
Apr 4, 2018·Environmental Microbiology·Josefin SefbomAnna Godhe
Jun 12, 2018·Journal of Phycology·Sylvie V M TessonKarin Rengefors
Nov 30, 2018·Frontiers in Microbiology·Sylvie V M Tesson, Tina Šantl-Temkiv
Aug 21, 2018·FEMS Microbiology Ecology·Christopher R J KavazosPierre Horwitz

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Methods Mentioned

BETA
genotyping
electrophoresis
AFLP

Software Mentioned

AFLPScore
Arlequin
amova
GeneMapper
survey
AFLP
MapMarker

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