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Article: 'Out-of-Africa' dispersal of tropical floras during the Miocene climatic optimum: Evidence from Uvaria (Annonaceae)
Title | 'Out-of-Africa' dispersal of tropical floras during the Miocene climatic optimum: Evidence from Uvaria (Annonaceae) | ||||
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Authors | |||||
Keywords | Africa-Asia disjunction Ancestral area Angiosperms Annonaceae Historical biogeography Long-distance dispersal Migration Tropical forests | ||||
Issue Date | 2012 | ||||
Publisher | Blackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/JBI | ||||
Citation | Journal Of Biogeography, 2012, v. 39 n. 2, p. 322-335 How to Cite? | ||||
Abstract | Aim African-Asian disjunctions are common in palaeotropical taxa, and are typically explained by reference to three competing hypotheses: (1) 'rafting' on the Indian tectonic plate, enabling Africa-to-Asia dispersal; (2) migration via Eocene boreotropical forests; and (3) transoceanic long-distance dispersal. These hypotheses are tested using Uvaria (Annonaceae), which is distributed in tropical regions of Africa, Asia and Australasia. Recent phylogenetic reconstructions of the genus show a clear correlation with geographical provenance, indicating a probable origin in Africa and subsequent dispersal to Asia and then Australasia. Ancestral areas and migration routes are inferred and compared with estimates of divergence times in order to distinguish between the prevailing dispersal hypotheses. Location Palaeotropics. Methods Divergence times in Uvaria are estimated by analysing the sequences of four DNA regions (matK, psbA-trnH spacer, rbcL and trnL-F) from 59 Uvaria species and 77 outgroup species, using a Bayesian uncorrelated lognormal (UCLD) relaxed molecular clock. The ancestral area of Uvaria and subsequent dispersal routes are inferred using statistical dispersal-vicariance analysis (s-diva). Results Uvaria is estimated to have originated in continental Africa 31.6Ma [95% highest posterior density (HPD): 38.4-25.1Ma] between the Middle Eocene and Late Oligocene. Two main migration events during the Miocene are identified: dispersal into Madagascar around 17.0Ma (95% HPD: 22.3-12.3Ma); and dispersal into Asia between 21.4Ma (95% HPD: 26.7-16.7Ma) and 16.1Ma (95% HPD: 20.1-12.1Ma). Main conclusions Uvaria fruits are widely reported to be consumed by primates, and are therefore unlikely candidates for successful long-distance transoceanic dispersal. The other biogeographical hypotheses, involving rafting on the Indian tectonic plate, and dispersal via the European boreotropical forests associated with the Eocene thermal maximum, can be discounted due to incongruence with the divergence time estimates. An alternative scenario is suggested, involving dispersal across Arabia and central Asia via the tropical forests that developed during the late Middle Miocene thermal maximum (17-15Ma), associated with the 'out-of-Africa' dispersal of primates. The probable route and mechanism of overland dispersal between Africa and Asia for tropical plant groups during the Miocene climatic optimum are clarified based on the Uvaria data. © 2011 Blackwell Publishing Ltd. | ||||
Persistent Identifier | http://hdl.handle.net/10722/144731 | ||||
ISSN | 2023 Impact Factor: 3.4 2023 SCImago Journal Rankings: 1.460 | ||||
ISI Accession Number ID |
Funding Information: Financial support was provided by grant HKU 7772/10M (awarded to R.M.K.S.) from the Hong Kong Research Grants Council. We are grateful to: Lars Chatrou for unpublished sequences of several species; Jason Ali for discussions on the geological history of Africa and Madagascar; and Thomas Couvreur, Jim Doyle, Susanne Renner and an anonymous referee for their invaluable comments. | ||||
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Zhou, L | en_HK |
dc.contributor.author | Su, YCF | en_HK |
dc.contributor.author | Thomas, DC | en_HK |
dc.contributor.author | Saunders, RMK | en_HK |
dc.date.accessioned | 2012-02-03T06:20:12Z | - |
dc.date.available | 2012-02-03T06:20:12Z | - |
dc.date.issued | 2012 | en_HK |
dc.identifier.citation | Journal Of Biogeography, 2012, v. 39 n. 2, p. 322-335 | en_HK |
dc.identifier.issn | 0305-0270 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/144731 | - |
dc.description.abstract | Aim African-Asian disjunctions are common in palaeotropical taxa, and are typically explained by reference to three competing hypotheses: (1) 'rafting' on the Indian tectonic plate, enabling Africa-to-Asia dispersal; (2) migration via Eocene boreotropical forests; and (3) transoceanic long-distance dispersal. These hypotheses are tested using Uvaria (Annonaceae), which is distributed in tropical regions of Africa, Asia and Australasia. Recent phylogenetic reconstructions of the genus show a clear correlation with geographical provenance, indicating a probable origin in Africa and subsequent dispersal to Asia and then Australasia. Ancestral areas and migration routes are inferred and compared with estimates of divergence times in order to distinguish between the prevailing dispersal hypotheses. Location Palaeotropics. Methods Divergence times in Uvaria are estimated by analysing the sequences of four DNA regions (matK, psbA-trnH spacer, rbcL and trnL-F) from 59 Uvaria species and 77 outgroup species, using a Bayesian uncorrelated lognormal (UCLD) relaxed molecular clock. The ancestral area of Uvaria and subsequent dispersal routes are inferred using statistical dispersal-vicariance analysis (s-diva). Results Uvaria is estimated to have originated in continental Africa 31.6Ma [95% highest posterior density (HPD): 38.4-25.1Ma] between the Middle Eocene and Late Oligocene. Two main migration events during the Miocene are identified: dispersal into Madagascar around 17.0Ma (95% HPD: 22.3-12.3Ma); and dispersal into Asia between 21.4Ma (95% HPD: 26.7-16.7Ma) and 16.1Ma (95% HPD: 20.1-12.1Ma). Main conclusions Uvaria fruits are widely reported to be consumed by primates, and are therefore unlikely candidates for successful long-distance transoceanic dispersal. The other biogeographical hypotheses, involving rafting on the Indian tectonic plate, and dispersal via the European boreotropical forests associated with the Eocene thermal maximum, can be discounted due to incongruence with the divergence time estimates. An alternative scenario is suggested, involving dispersal across Arabia and central Asia via the tropical forests that developed during the late Middle Miocene thermal maximum (17-15Ma), associated with the 'out-of-Africa' dispersal of primates. The probable route and mechanism of overland dispersal between Africa and Asia for tropical plant groups during the Miocene climatic optimum are clarified based on the Uvaria data. © 2011 Blackwell Publishing Ltd. | en_HK |
dc.language | eng | en_US |
dc.publisher | Blackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/JBI | en_HK |
dc.relation.ispartof | Journal of Biogeography | en_HK |
dc.rights | The definitive version is available at www.blackwell-synergy.com | - |
dc.subject | Africa-Asia disjunction | en_HK |
dc.subject | Ancestral area | en_HK |
dc.subject | Angiosperms | en_HK |
dc.subject | Annonaceae | en_HK |
dc.subject | Historical biogeography | en_HK |
dc.subject | Long-distance dispersal | en_HK |
dc.subject | Migration | en_HK |
dc.subject | Tropical forests | en_HK |
dc.title | 'Out-of-Africa' dispersal of tropical floras during the Miocene climatic optimum: Evidence from Uvaria (Annonaceae) | en_HK |
dc.type | Article | en_HK |
dc.identifier.email | Saunders, RMK: saunders@hkucc.hku.hk | en_HK |
dc.identifier.authority | Saunders, RMK=rp00774 | en_HK |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1111/j.1365-2699.2011.02598.x | en_HK |
dc.identifier.scopus | eid_2-s2.0-84855778726 | en_HK |
dc.identifier.hkuros | 198544 | en_US |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-84855778726&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 39 | en_HK |
dc.identifier.issue | 2 | en_HK |
dc.identifier.spage | 322 | en_HK |
dc.identifier.epage | 335 | en_HK |
dc.identifier.eissn | 1365-2699 | - |
dc.identifier.isi | WOS:000299042000008 | - |
dc.publisher.place | United Kingdom | en_HK |
dc.identifier.scopusauthorid | Zhou, L=37036565600 | en_HK |
dc.identifier.scopusauthorid | Su, YCF=7404456219 | en_HK |
dc.identifier.scopusauthorid | Thomas, DC=25628765500 | en_HK |
dc.identifier.scopusauthorid | Saunders, RMK=35345489600 | en_HK |
dc.identifier.issnl | 0305-0270 | - |