Vicariance, Dispersal, and Hybridization in a Naturally Fragmented System: The Afro-Alpine Endemics Carex Monostachya and C. Runssoroensis (Cyperaceae)

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dc.contributor.authorGizaw, Abel
dc.contributor.authorWondimu, Tigist
dc.contributor.authorMugizi, Tusiime F.
dc.contributor.authorMasao, Catherine A.
dc.contributor.authorAbdi, Ahmed A.
dc.contributor.authorPopp, Magnus
dc.contributor.authorEhrich, Dorothee
dc.contributor.authorNemomissa, Sileshi
dc.contributor.authorBrochmann, Christian
dc.date.accessioned2016-06-26T18:43:46Z
dc.date.available2016-06-26T18:43:46Z
dc.date.issued2016
dc.descriptionFull text can be accessed at http://link.springer.com/article/10.1007/s00035-015-0162-2en_US
dc.description.abstractThe naturally fragmented habitat on the tallest African mountains provides a good model system to study vicariance, dispersal, and hybridization. Many mountains are separated by lowland that likely was unsuitable for high-alpine plants even during cold climatic periods. We explore the relative importance of these processes using two endemic sister species: the widespread Ethiopian/eastern East African Carex monostachya and the mainly western East African C. runssoroensis. These bog-forming sedges co-occur in some mountains and are hypothesized to hybridize. The two species were distinctly differentiated for genome-wide amplified fragment length polymorphisms (AFLPs), also in one mountain where they co-occur. However, the plants from another mountain showed strong signals of admixture. The results suggest initial divergence into one western and one northern/eastern lineage, followed by long-distance dispersal resulting in secondary contact zones. In addition within species genetic diversity was clearly structured with distinct genetic groups on some, but not all mountains. Differentiation levels varied considerably and did not always correspond to the extent of lowland habitat between mountains. The narrow Rift Valley in the otherwise nearly contiguous highlands in Ethiopia appears to present a much stronger barrier to dispersal than the extensive lowlands separating Ethiopia from East Africa. This may be a general pattern since it has been documented also for other afro-alpine species.en_US
dc.identifier.citationGizaw, A., Wondimu, T., Mugizi, T.F., Masao, C.A., Abdi, A.A., Popp, M., Ehrich, D., Nemomissa, S. and Brochmann, C., 2016. Vicariance, dispersal, and hybridization in a naturally fragmented system: the afro-alpine endemics Carex monostachya and C. runssoroensis (Cyperaceae). Alpine Botany, 126(1), pp.59-71.en_US
dc.identifier.doi10.1007/s00035-015-0162-2
dc.identifier.urihttp://hdl.handle.net/20.500.11810/2802
dc.language.isoenen_US
dc.publisherSpringer Linken_US
dc.subjectAfro-alpineen_US
dc.subjectCarexen_US
dc.subjectHybridizationen_US
dc.subjectLong-distance dispersalen_US
dc.subjectVicarianceen_US
dc.titleVicariance, Dispersal, and Hybridization in a Naturally Fragmented System: The Afro-Alpine Endemics Carex Monostachya and C. Runssoroensis (Cyperaceae)en_US
dc.typeJournal Articleen_US
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