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dc.contributor.authorMilton, Joseph J.
dc.contributor.authorAffenzeller, Matthias
dc.contributor.authorAbbott, Richard
dc.contributor.authorComes, Hans P.
dc.identifier.citationMilton , J J , Affenzeller , M , Abbott , R & Comes , H P 2022 , ' Plant speciation in the Namib Desert : potential origin of a widespread derivative species from a narrow endemic ' , Plant Ecology & Diversity , vol. 15 , no. 5-6 , pp. 329-353 .
dc.descriptionFunding: This research was funded in part by the award of a Natural Environment Research Council (NERC) CASE research studentship to J.J.M.en
dc.description.abstractBackground:  Parapatric (or ‘budding’) speciation is increasingly recognised as an important phenomenon in plant evolution but its role in extreme (e.g. desert) environments is poorly documented. Aims:  To test this speciation model in a hypothesised sister pair, the Southwest – North African disjunct Senecio flavus and its putative progenitor, the Namibian Desert endemic S. englerianus. Methods:  Phylogenetic inferences were combined with niche divergence tests, morphometrics, and experimental-genetic approaches. We also evaluated the potential role of an African Dry Corridor (ADC) in promoting the hypothesised northward expansion of S. flavus (from Namibia), using palaeodistribution models. Results:  Belonging to an isolated (potential ‘relict’) clade, the two morphologically distinct species showed pronounced niche divergence in Namibia and signs of digenic-epistatic hybrid incompatibility (based on F2 pollen fertility). The presence of ‘connate-fluked’ pappus hairs in S. flavus, likely increasing dispersal ability, is controlled by a single gene locus. Conclusions:  Our results provide evidence for a possible (and rare) example of ‘budding’ speciation in which a wider-ranged derivative (S. flavus) originated at the periphery of a smaller-ranged progenitor (S. englerianus) in the Namib Desert region. The Southwest – North African disjunction of S. flavus could have been established by dispersal across intermediate ADC areas during periods of (Late) Pleistocene aridification.
dc.relation.ispartofPlant Ecology & Diversityen
dc.subjectAfrican Dry Corridoren
dc.subjectBudding speciationen
dc.subjectNamib Deserten
dc.subjectNiche differentiationen
dc.subjectPhylogenetic relictsen
dc.subjectReproductive isolation barriersen
dc.subjectQK Botanyen
dc.titlePlant speciation in the Namib Desert : potential origin of a widespread derivative species from a narrow endemicen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Biologyen
dc.description.statusPeer revieweden

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