Academic journal article Borneo Research Bulletin

Phylogenetics and Phylogeography of the South Pacific Alpine Plant Oreomyrrhis: Insights into Global Alpine Biogeography

Academic journal article Borneo Research Bulletin

Phylogenetics and Phylogeography of the South Pacific Alpine Plant Oreomyrrhis: Insights into Global Alpine Biogeography

Article excerpt

Alpine vegetation worldwide constitutes the alpine ecosystem, the only terrestrial biome that is distributed across a large latitudinal gradient and reaches a global distribution. Plant groups distributed in multiple alpine systems thus present an excellent system to test biogeographic hypotheses on a global scale. In this dissertation, phylogenetics and phylogeography of Oreomyrrhis are studied to elucidate its controversial phylogenetic relationships within the family Apiaceae and the historical biogeographic mechanisms that generated its disjunct distribution in the southern portion of the Pacific Basin (Mesoamerica, Andes, southern Patagonia, Tierra del Fuego, Falklands, New Zealand, SE Australia, Tasmania, New Guinea, Borneo, and Taiwan). Analyses of nuclear ITS sequences unambiguously place Oreomyrrhis in the subtribe Scandicinae (tribe Scandiceae) and suggest its intimate relationship with the North American species of the otherwise Eurasian genus Chaerophyllum. Analyses of the combined data set composed of ITS and two chloroplast intergenic spacers (trnS-trnG and atpB-rbcL) further confirm the monophyly of Oreomyrrhis and its sister taxon relationship with the North American Chaerophyllum. This well-established phylogenetic relationship strongly supports synonymizing Oreomyrrhis taxa with Chaerophyllum. The star-like haplotype network structure in all three data sets (ITS, trnS-trnG, and atpB-rbcL ) suggests a scenario of recent population range expansion, an inference consistent with the significant negative value of the Tajima's D. …

Search by... Author
Show... All Results Primary Sources Peer-reviewed

Oops!

An unknown error has occurred. Please click the button below to reload the page. If the problem persists, please try again in a little while.