TY  - JOUR
A1  - Tahvanainen, Pia
A1  - Alpermann, Tilman Jens
A1  - Figueroa, Rosa Isabel
A1  - John, Uwe
A1  - Hakanen, Päivi
A1  - Nagai, Satoshi
A1  - Blomster, Jaanika
A1  - Kremp, Anke
T1  - Patterns of post-glacial genetic differentiation in marginal populations of a marine microalga
T2  - PLoS One
N2  - This study investigates the genetic structure of an eukaryotic microorganism, the toxic dinoflagellate Alexandrium ostenfeldii, from the Baltic Sea, a geologically young and ecologically marginal brackish water estuary which is predicted to support evolution of distinct, genetically impoverished lineages of marine macroorganisms. Analyses of the internal transcribed spacer (ITS) sequences and Amplified Fragment Length Polymorphism (AFLP) of 84 A. ostenfeldii isolates from five different Baltic locations and multiple external sites revealed that Baltic A. ostenfeldii is phylogenetically differentiated from other lineages of the species and micro-geographically fragmented within the Baltic Sea. Significant genetic differentiation (FST) between northern and southern locations was correlated to geographical distance. However, instead of discrete genetic units or continuous genetic differentiation, the analysis of population structure suggests a complex and partially hierarchic pattern of genetic differentiation. The observed pattern suggests that initial colonization was followed by local differentiation and varying degrees of dispersal, most likely depending on local habitat conditions and prevailing current systems separating the Baltic Sea populations. Local subpopulations generally exhibited low levels of overall gene diversity. Association analysis suggests predominately asexual reproduction most likely accompanied by frequency shifts of clonal lineages during planktonic growth. Our results indicate that the general pattern of genetic differentiation and reduced genetic diversity of Baltic populations found in large organisms also applies to microscopic eukaryotic organisms.
Y1  - 2012
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/28360
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-283609
SN  - 1932-6203
N1  - Copyright: © 2012 Tahvanainen et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
VL  - 7
IS  - (12): e53602
PB  - PLoS
CY  - Lawrence, Kan.
ER  -