期刊
PROTIST
卷 171, 期 6, 页码 -出版社
ELSEVIER GMBH
DOI: 10.1016/j.protis.2020.125771
关键词
Austral Andes; biogeography; genetic diversity; long-distance dispersal; microorganisms; wind dispersal
类别
资金
- SYNTHESYS Project - European Community Research Infrastructure Action under the FP7 Capacities Program [ES-TAF-5973]
- project Mlodzi Naukowcy 2014 - W. Szafer Institute of Botany, Polish Academy of Sciences
- Polish National Science Centre [N N303 799440]
- W. Szafer Institute of Botany of the Polish Academy of Sciences
- Myxotropic project - Spanish Government [(MCIU/AEI/FEDER, UE)] [CGL2014-52584, PGC2018-094660-B100]
Soil protists play a crucial role in terrestrial ecosystems and often show immense taxonomic diversity. However, for many groups, distribution patterns remain largely unknown. We investigated range-wide intraspecific diversity of a specialized airborne protist (Didymium nivicola Meyl.) that occupies a narrow ecological niche associated with long-lasting snow cover. We sampled 122 collections covering all areas where the species was recorded worldwide. We obtained 105 and 41 sequences of small ribosomal subunit rDNA (SSU) and elongation factor 1-alpha (EF1A), respectively. While the species is very diverse in the austral Andes, Southern Hemisphere (SH; 17 SSU ribotypes and 12 EF1A genotypes identified), its populations are genetically uniform across three continents of the Northern Hemisphere (NH; single ribotype, single genotype). Our results indicate the austral Andes as a possible diversification centre for D. nivicola where populations seem to reproduce sexually. Two main parts of the range display highly contrasting genetic patterns, thus biogeographical history and dynamics. Current distribution of D. nivicola in the NH is likely a result of a dispersal event from the SH and subsequent long-distance dispersal (LDD) that might be associated with a shift to asexual mode of reproduction. (C) 2020 Elsevier GmbH. All rights reserved.
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