0396274 - ÚBO 2014 RIV GB eng J - Journal Article
Bartáková, Veronika - Reichard, Martin - Janko, Karel - Polačik, Matej - Blažek, Radim - Reichwald, K. - Cellerino, A. - Bryja, Josef
Strong population genetic structuring in an annual fish, Nothobranchius furzeri, suggests multiple savannah refugia in southern Mozambique.
BMC Evolutionary Biology. Roč. 13, č. 196 (2013), s. 196. ISSN 1471-2148. E-ISSN 1471-2148
R&D Projects: GA ČR GA206/09/0815; GA ČR GBP505/12/G112
Institutional support: RVO:68081766
Keywords : Temporary pool * Phylogeography * Population genetics * Cyprinodontiformes * Senescence * Pluvials * Pleistocene climate changes * Dispersal * Founder effect * Killifish
Subject RIV: EG - Zoology
Impact factor: 3.407, year: 2013
http://www.biomedcentral.com/1471-2148/13/196

Genetic structure and historical demography of N. furzeri were analysed using a combination of mitochondrial (partial cytochrome b sequences, 687 bp) and nuclear (13 microsatellites) markers in 693 fish from 36 populations. Genetic markers consistently demonstrated strong population structuring and suggested two main genetic groups associated with river basins. The split was dated to the Pliocene (>2 Mya). The northern group inhabits savannah pools across the basin of the intermittent river Chefu in south-western Mozambique and eastern Zimbabwe. The southern group (from southernmost Mozambique) is subdivided, with the River Limpopo forming a barrier (maximum divergence time 1 Mya). A strong habitat fragmentation (isolated temporary pools) is reflected in significant genetic structuring even between adjacent pools, with a major influence of genetic drift and significant isolation-by-distance. Analysis of historical demography revealed that the expansion of both groups is ongoing, supported by frequent founder effects in marginal parts of the range and evidence of secondary contact between Chefu and Limpopo populations. Conclusions: We demonstrated: (1) ancient (pre-Pleistocene) divergence between the two main N. furzeri lineages, their recent secondary contact and lack of reproductive isolation; (2) important genetic structuring attributed to the fragmented nature of their environment and isolation-by-distance, suggesting that dispersal is limited, occurs over short distances and is not directly associated with river routes; (3) an apparent role of the River Limpopo as a barrier to dispersal and gene flow.
Permanent Link: http://hdl.handle.net/11104/0224110