Evolution and diversification related to rainfall regimes: diversification patterns in the South African genus Metalasia (Asteraceae-Gnaphalieae)

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Bengtson, AnnikaNaturhistoriska riksmuseet,Stockholms universitet,Institutionen för ekologi, miljö och botanik,Enheten för botanik (författare)

Evolution and diversification related to rainfall regimes : diversification patterns in the South African genus Metalasia (Asteraceae-Gnaphalieae)

Artikel/kapitelEngelska2015

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2014-08-18
Wiley,2015
printrdacarrier

Nummerbeteckningar

LIBRIS-ID:oai:DiVA.org:su-113113
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-113113URI
https://doi.org/10.1111/jbi.12390DOI
https://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-1091URI

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Språk:engelska
Sammanfattning på:engelska

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Ämneskategori:ref swepub-contenttype
Ämneskategori:art swepub-publicationtype

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AuthorCount:4;
AimThe Cape region is known for its exceptional species richness, although much remains unknown regarding the appearance of the modern Cape flora. One explanation is that floral diversification was influenced by the establishment of winter rainfall/summer arid conditions hypothesized to have occurred towards the end of the Miocene. We studied the evolution and diversification of the plant genus Metalasia (Asteraceae-Gnaphalieae), with the aim of testing whether radiation patterns may have been influenced by the climatic changes. LocationSouth Africa, with emphasis on the south-west. MethodsThe radiation of Metalasia was investigated using two approaches: a species diffusion approach, which estimated the ancestral areas by means of a relaxed random walk while sampling from extant distributions; and a discrete approach, in which distributions were defined according to the phytogeographical centres of the Cape region. Secondarily derived clock rates from an earlier Gnaphalieae study were used for calibration purposes. ResultsOur analyses date Metalasia to approximately 6.9Ma, after the Miocene-Pliocene boundary and the establishment of the winter rainfall/summer arid conditions. Metalasia consists of two sister clades: Clade A and Clade B. Clade B, which is endemic to the winter rainfall area, is estimated to have diversified c. 6.4Ma, whereas Clade A, with a main distribution in the all-year rainfall area, is considerably younger, with a crown group age estimated to 3.3Ma. Diversification rates suggest an early rapid speciation, with rates decreasing through time both for Metalasia and for clades A and B separately. Ancestral area estimations show a possible scenario for the radiation of Metalasia to its current diversity and distribution, with no conflict between results inferred from diffusion or discrete methods. Main conclusionsThe diversification of Metalasia is estimated to have begun after the establishment of the winter rainfall/summer arid conditions, consistent with its radiation having been influenced by changes in the climatic regime.

Ämnesord och genrebeteckningar

NATURVETENSKAP Geovetenskap och miljövetenskap hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences hsv//eng
NATURVETENSKAP Biologi hsv//swe
NATURAL SCIENCES Biological Sciences hsv//eng
NATURVETENSKAP Biologi Biologisk systematik hsv//swe
NATURAL SCIENCES Biological Sciences Biological Systematics hsv//eng
Biogeography
Cape flora
Cape Floristic Region
diversity
Metalasia
South Africa
species-tree diffusion
winter rainfall
växtsystematik
Plant Systematics
Diversity of life

Biuppslag (personer, institutioner, konferenser, titlar ...)

Nylinder, StephanNaturhistoriska riksmuseet,Enheten för botanik(Swepub:nrm)stepnyli (författare)
Karis, Per OlaStockholms universitet,Institutionen för ekologi, miljö och botanik(Swepub:su)karis (författare)
Anderberg, Arne A.,1954-Naturhistoriska riksmuseet,Enheten för botanik(Swepub:nrm)arneande (författare)
Stockholms universitetInstitutionen för ekologi, miljö och botanik (creator_code:org_t)

Sammanhörande titlar

Ingår i:Journal of Biogeography: Wiley42:1, s. 121-1310305-02701365-2699

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Av författaren/redakt...: Bengtson, Annika; Nylinder, Stepha ...; Karis, Per Ola; Anderberg, Arne ...

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NATURVETENSKAP: NATURVETENSKAP; och Geovetenskap och ...

NATURVETENSKAP: NATURVETENSKAP; och Biologi

NATURVETENSKAP: NATURVETENSKAP; och Biologi; och Biologisk system ...

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Av lärosätet: Stockholms universitet; Naturhistoriska riksmuseet

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