Abstract Detail

Pacific Biogeography

Lim, Junying [1], Zimmer, Elizabeth [2], Wagner, Warren [3].

Genome skimming reveals the evolutionary and biogeographic history of Pacific Peperomia (Piperaceae).

Peperomia are one of the most species-rich genera globally (ca. 1600 species). Though primarily distributed across the world’s continental tropics, Peperomia have also colonized and diversified across the islands of the Pacific, which collectively harbor about a tenth of its global diversity. Nevertheless, despite their evolutionary success in the Pacific, the evolutionary relationships and patterns of dispersal among Pacific taxa are unclear. In addition, larger island archipelagos such as Hawaii and Fiji have been hypothesized to play host to independent radiations derived from single colonization events, but the monophyly of endemic taxa on these archipelagoes remain to be tested. Lastly, preliminary data for several nuclear and chloroplast markers have yielded insufficient phylogenetic signal, suggest the radiation may be fairly young and so necessitates a genomic approach. To better resolve the evolutionary relationships of Pacific taxa, we sequence full plastomes for over 80 Pacific taxa using a genome skimming next-generation sequencing approach. Using this phylogeny, we inferred patterns of dispersal and diversification in this group across the Pacific and within the Hawaiian archipelago using probabilistic historical biogeographic models. We find a fairly complex history of colonization across the Pacific by two main lineages, one of which has diversified greatly, while the other has not. Interestingly, the endemic taxa (23 species) of the Hawaiian archipelago may be derived from a single colonization event, similar to that of other diverse lineages on the archipelago such as the silverswords and lobeliads. Our results shed light on the evolutionary history and extraordinary radiation of this diverse group across the Pacific, and provide insight into the evolutionary assembly of island floras.

1 - University of California, Berkeley, Integrative Biology, 3040 Valley Life Sciences Building, Berkeley, CA, 94720, USA
2 - Smithsonian NMNH, Botany, P.O. Box 37102, Smithsonian National Museum Of Natural History, Washington, DC, 20013, United States
3 - Smithsonian Institution, Department Of Botany, MRC-166, P. O. Box 37012, Washington, DC, 20013, United States

Pacific Ocean

Presentation Type: Colloquium Presentations
Abstract ID:179
Candidate for Awards:None

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