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Genetic diversity of a widespread annual killifish from coastal Tanzania
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SYSNO ASEP 0519220 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Genetic diversity of a widespread annual killifish from coastal Tanzania Author(s) Bartáková, Veronika (UBO-W) SAI, RID, ORCID
Nagy, B. (FR)
Polačik, Matej (UBO-W) RID, SAI, ORCID
Blažek, Radim (UBO-W) RID, ORCID, SAI
Lamtane, H. (TZ)
Reichard, Martin (UBO-W) RID, ORCID, SAI, SAINumber of authors 6 Article number 1 Source Title BMC Evolutionary Biology. - : BioMed Central - ISSN 1471-2148
Roč. 20, č. 1 (2020)Number of pages 13 s. Language eng - English Country GB - United Kingdom Keywords Dispersal ; Eastern Africa ; River morphology ; Temporary pool ; mtDNA ; Historical demography Subject RIV EG - Zoology OECD category Biology (theoretical, mathematical, thermal, cryobiology, biological rhythm), Evolutionary biology R&D Projects GA19-01781S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UBO-W - RVO:68081766 UT WOS 000514860900001 EID SCOPUS 85077542825 DOI 10.1186/s12862-019-1549-2 Annotation Background: African annual killifishes (Nothobranchius spp.) are adapted to seasonally desiccating habitats (ephemeral pools), surviving dry periods as dormant eggs. Given their peculiar life history, geographic aspects of their diversity uniquely combine patterns typical for freshwater taxa (river basin structure and elevation gradient) and terrestrial animals (rivers acting as major dispersal barriers). However, our current knowledge on fine-scale interspecific and intra-specific genetic diversity of African annual fish is limited to a single, particularly dry region of their distribution (subtropical Mozambique). Using a widespread annual killifish from coastal Tanzania and Kenya, we tested whether the same pattern of genetic divergence pertains to a wet equatorial region in the centre of Nothobranchius distribution.
Results: In populations of Nothobranchius melanospilus species group across its range, we genotyped a part of mitochondrial cytochrome oxidase subunit 1 (COI) gene (83 individuals from 22 populations) and 10 nuclear microsatellite markers (251 individuals from 16 populations). We found five lineages with a clear phylogeographic structure but frequent secondary contact. Mitochondrial lineages were largely congruent with main population genetic clusters identified on microsatellite markers. In the upper Wami basin, populations are isolated as a putative Nothobranchius prognathus, but include also a population from a periphery of the middle Ruvu basin. Other four lineages (including putative Nothobranchius kwalensis) coexisted in secondary contact zones, but possessed clear spatial pattern. Main river channels did not form apparent barriers to dispersal. The most widespread lineage had strong signal of recent population expansion.
Conclusions: We conclude that dispersal of a Nothobranchius species from a wet part of the genus distribution (tropical lowland) is not constrained by main river channels and closely related lineages frequently coexist in secondary contact zones. We also demonstrate contemporary connection between the Ruvu and Rufiji river basins. Our data do not provide genetic support for existence of recently described cryptic species from N. melanospilus complex, but cannot resolve this issue.Workplace Institute of Vertebrate Biology Contact Hana Slabáková, slabakova@ivb.cz, Tel.: 543 422 524 Year of Publishing 2021 Electronic address https://bmcevolbiol.biomedcentral.com/articles/10.1186/s12862-019-1549-2
Number of the records: 1