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Phylogeographical pattern of E uplotes nobilii , a protist ciliate with a bipolar biogeographical distribution
Author(s) -
Di Giuseppe Graziano,
Barbieri Michele,
Vallesi Adriana,
Luporini Pierangelo,
Dini Fernando
Publication year - 2013
Publication title -
molecular ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.619
H-Index - 225
eISSN - 1365-294X
pISSN - 0962-1083
DOI - 10.1111/mec.12363
Subject(s) - biology , panmixia , protist , arctic , population , gene flow , ciliate , phylogeography , evolutionary biology , gene , genetics , ecology , zoology , genetic variation , phylogenetics , demography , sociology
Nuclear (18S and ITS ) and mitochondrial (16S) ribosomal RNA gene sequences were determined from genetically distinct wild‐type strains of Antarctic (nine strains), Fuegian (four strains), Greenland (nine strains) and Svalbard (three strains) populations of the marine ciliate, E uplotes nobilii , and analysed for their nucleotide polymorphisms. A close genetic homogeneity was found within and between the Antarctic and Fuegian populations, while more significant levels of genetic differentiation were detected within and between the two Arctic populations, as well as between these populations and the Antarctic/Fuegian ones. The phylogeographical pattern that was derived from these data indicates that gene flow is not limited among Arctic populations; it equally connects the Arctic and Antarctic populations either directly, or through the Fuegian population. This indication reinforces previous evidence from laboratory assays of mating interactions between some of the strains analysed in this work that Southern and Northern polar populations of E . nobilii belong to a unique, panmictic population that substantially share the same gene pool.