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Abstract Detail



Biogeography

Appelhans, Marc [1], Wen, Jun [2], Wagner, Warren L. [3].

Phylogeny and biogeography of the Euodia alliance (Rutaceae): key innovations for species richness.

Because of their wide distributions, which range from SE Asia, the Malesian region, Australia, to Pacific islands (and Madagascar in Melicope), the genera Acronychia, Euodia and Melicope (Rutaceae) are ideal examples to study Asian and Pacific biogeography. The center of species richness and endemicity of all three genera is New Guinea but the three genera differ greatly in terms of species richness (Acronychia: 48 spp., Euodia: 7 spp. and Melicope: about 230 spp.). Our molecular phylogenetic studies show that Melicope and Acronychia are closely related and that Euodia is sister to both. A number of monotypic or small genera mainly from New Caledonia and New Guinea need to be included in Melicope (Comptonella, Platydesma, Picrella, and Sarcomelicope), while others are closely related to Euodia (Brombya, Perryodendron, and Pitaviaster). Our molecular dating analyses suggest that the Acronychia Melicope clade and the Euodia clade might have originated in the late Oligocene to early Miocene. Considering the similar age of the clades, the differences in species richness are striking and may be explained by differences in seed coat anatomy that enabled dispersal by endozoochory in Acronychia and Melicope. In this way, Melicope reached distant regions such as Madagascar, Hawai´i and the Marquesas Islands while Euodia remained restricted to New Guinea, Northern Australia and nearby archipelagos.


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1 - Goettingen University, Department of Systematic Botany, Untere Karspuele 2, Goettingen, Lower Saxony, 37073, Germany
2 - Smithsonian Institution, Botany, MRC-166 National Museum Of Natural History, 10th St. & Constitution Ave., NW, MRC 166, Washington/DC, N/A, 20013-7012, USA
3 - Smithsonian Institution, Botany, MRC-166 National Museum Of Natural History, PO Box 37012, WASHINGTON, DC, 20013-7012, USA

Keywords:
Rutaceae
species richness
SE Asia
oceanic islands
Hawaiian Islands.

Presentation Type: Oral Paper:Papers for Topics
Session: 3
Location: Salmon/Boise Centre
Date: Monday, July 28th, 2014
Time: 11:30 AM
Number: 3013
Abstract ID:894
Candidate for Awards:None


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