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Abstract Detail


Biogeography

Willis, Crystal L. [1], Weston, Peter H. [2], Mast, Austin [3].

Inference of phylogenetic relationships in Macadamia and relatives (tribe Macadamieae; Proteaceae) using three chloroplast and three nuclear DNA regions.

Tribe Macadamieae (Macadamia and relatives; 91 spp in 16 genera in 4 subtribes) is widespread across the southern hemisphere and varies considerably in fruit morphology. We sampled three chloroplast DNA (matK, atpB, and ndhF) and three nuclear DNA (waxy loci 1 and 2 and PHYA) genes from all genera of tribe Macadamieae and 4 outgroup taxa. Chloroplast DNA data resolve the tribe and its component subtribes as monophyletic. Nuclear DNA data resolves the subtribes as monophyletic, but it resolves these in a polytomy with outgroup taxa (Banksia and Grevillea). Macadamia is resolved as paraphyletic with respect to the South African genus Brabejum (1 sp.) and the South American genus Panopsis (25 spp.). The result from the analysis with the chloroplast and nuclear DNA data combined resolves the drupaceous subtribe Malagasiinae as sister to the drupaceous subtribe Virotiinae, these two sister to the non-drupaceous subtribe Macadamiinae, and finally, this clade as sister to the drupaceous subtribe Gevuininae. Based on dating of the tribe's age in an ongoing, taxonomically broader study, it is clear that disjunctions in the tribe arose after most terrestrial connections were lost between southern landmasses (except between Australia and South America). Using Fitch parsimony, Australia is resolved to be the area occupied by the MRCA of the tribe and the MRCA’s of each subtribe with many subsequent long-distance dispersal events.


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Related Links:
Mast Faculty Website


1 - Florida State University, Dept. of Biological Science, Tallahassee, FL, 32306, USA
2 - Royal Botanic Gardens, Mrs Macquaries Road, Sydney, New South Wales, 2000, Australia
3 - Florida State University, Department of Biological Sciences, Tallahasse, Florida, 32306-1100, USA

Keywords:
phylogeny
Macadamia
Biogeography
Australia
Proteaceae
Fruit evolution.

Presentation Type: Poster:Posters for Topics
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P62004
Abstract ID:1677


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