Catchments catch all in South African coastal lowlands: topography and palaeoclimate restricted gene flow in Nymania capensis (Meliaceae)—a multilocus phylogeographic and distribution modelling approach

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dc.contributor.authorPotts, Alastair J
dc.date.accessioned2021-10-08T07:11:27Z
dc.date.available2021-10-08T07:11:27Z
dc.date.issued2017
dc.description.abstractBackground This study investigates orbitally-forced range dynamics at a regional scale by exploring the evolutionary history of Nymania capensis (Meliaceae) across the deeply incised landscapes of the subescarpment coastal lowlands of South Africa; a region that is home to three biodiversity hotspots (Succulent Karoo, Fynbos, and Maputaland-Pondoland-Albany hotspots). Methods A range of methods are used including: multilocus phylogeography (chloroplast and high- and low-copy nuclear DNA), molecular dating and species distribution modelling (SDM). Results The results support an ‘evolutionarily distinct catchment’ hypothesis where: (1) different catchments contain genetically distinct lineages, (2) limited genetic structuring was detected within basins whilst high structuring was detected between basins, and (3) within primary catchment populations display a high degree of genealogical lineage sorting. In addition, the results support a glacial refugia hypothesis as: (a) the timing of chloroplast lineage diversification is restricted to the Pleistocene in a landscape that has been relatively unchanged since the late Pliocene, and (b) the projected LGM distribution of suitable climate for N. capensis suggest fragmentation into refugia that correspond to the current phylogeographic populations. Discussion This study highlights the interaction of topography and subtle Pleistocene climate variations as drivers limiting both seed and pollen flow along these lowlands. This lends support to the region’s large-scale conservation planning efforts, which used catchments as foundational units for conservation as these are likely to be evolutionarily significant units.
dc.identifier.apacitationPotts, A. J. (2017). Catchments catch all in South African coastal lowlands: topography and palaeoclimate restricted gene flow in Nymania capensis (Meliaceae)—a multilocus phylogeographic and distribution modelling approach. <i>PeerJ</i>, 5(4), e2965 - 177. http://hdl.handle.net/11427/34613en_ZA
dc.identifier.chicagocitationPotts, Alastair J "Catchments catch all in South African coastal lowlands: topography and palaeoclimate restricted gene flow in Nymania capensis (Meliaceae)—a multilocus phylogeographic and distribution modelling approach." <i>PeerJ</i> 5, 4. (2017): e2965 - 177. http://hdl.handle.net/11427/34613en_ZA
dc.identifier.citationPotts, A.J. 2017. Catchments catch all in South African coastal lowlands: topography and palaeoclimate restricted gene flow in Nymania capensis (Meliaceae)—a multilocus phylogeographic and distribution modelling approach. <i>PeerJ.</i> 5(4):e2965 - 177. http://hdl.handle.net/11427/34613en_ZA
dc.identifier.issn2167-8359
dc.identifier.ris TY - Journal Article AU - Potts, Alastair J AB - Background This study investigates orbitally-forced range dynamics at a regional scale by exploring the evolutionary history of Nymania capensis (Meliaceae) across the deeply incised landscapes of the subescarpment coastal lowlands of South Africa; a region that is home to three biodiversity hotspots (Succulent Karoo, Fynbos, and Maputaland-Pondoland-Albany hotspots). Methods A range of methods are used including: multilocus phylogeography (chloroplast and high- and low-copy nuclear DNA), molecular dating and species distribution modelling (SDM). Results The results support an ‘evolutionarily distinct catchment’ hypothesis where: (1) different catchments contain genetically distinct lineages, (2) limited genetic structuring was detected within basins whilst high structuring was detected between basins, and (3) within primary catchment populations display a high degree of genealogical lineage sorting. In addition, the results support a glacial refugia hypothesis as: (a) the timing of chloroplast lineage diversification is restricted to the Pleistocene in a landscape that has been relatively unchanged since the late Pliocene, and (b) the projected LGM distribution of suitable climate for N. capensis suggest fragmentation into refugia that correspond to the current phylogeographic populations. Discussion This study highlights the interaction of topography and subtle Pleistocene climate variations as drivers limiting both seed and pollen flow along these lowlands. This lends support to the region’s large-scale conservation planning efforts, which used catchments as foundational units for conservation as these are likely to be evolutionarily significant units. DA - 2017 DB - OpenUCT DP - University of Cape Town IS - 4 J1 - PeerJ LK - https://open.uct.ac.za PY - 2017 SM - 2167-8359 T1 - Catchments catch all in South African coastal lowlands: topography and palaeoclimate restricted gene flow in Nymania capensis (Meliaceae)—a multilocus phylogeographic and distribution modelling approach TI - Catchments catch all in South African coastal lowlands: topography and palaeoclimate restricted gene flow in Nymania capensis (Meliaceae)—a multilocus phylogeographic and distribution modelling approach UR - http://hdl.handle.net/11427/34613 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34613
dc.identifier.vancouvercitationPotts AJ. Catchments catch all in South African coastal lowlands: topography and palaeoclimate restricted gene flow in Nymania capensis (Meliaceae)—a multilocus phylogeographic and distribution modelling approach. PeerJ. 2017;5(4):e2965 - 177. http://hdl.handle.net/11427/34613.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Biological Sciences
dc.publisher.facultyFaculty of Science
dc.sourcePeerJ
dc.source.journalissue4
dc.source.journalvolume5
dc.source.paginatione2965 - 177
dc.source.urihttps://dx.doi.org/10.7717/peerj.2965
dc.subject.otherAlbany Subtropical Thicket
dc.subject.otherLast Glacial Maximum
dc.subject.otherMolecular dating
dc.subject.otherMultilocus phylogeography
dc.subject.otherNymania capensis
dc.subject.otherOrbitally-forced range dynamics
dc.subject.otherPleistocene climate cycles
dc.subject.otherSpecies palaeodistribution modelling
dc.titleCatchments catch all in South African coastal lowlands: topography and palaeoclimate restricted gene flow in Nymania capensis (Meliaceae)—a multilocus phylogeographic and distribution modelling approach
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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