Show simple item record

Files in this item


Item metadata

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.identifier.otherPURE: 281524726
dc.identifier.otherPURE UUID: 8fa2c2c5-af80-40ef-abec-c224d1760765
dc.identifier.otherScopus: 85141971328
dc.identifier.otherWOS: 000882900000001
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.rightsCopyright © 2022 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License (, which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way.en
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.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Biologyen
dc.description.statusPeer revieweden

This item appears in the following Collection(s)

Show simple item record