Abstract Detail

Phylogenomics

Gaynor, Michelle [1], Fu, Chaonan [2], Gao, Lianming [2], Lu, Li-Min [3], Soltis, Douglas [4], Soltis, Pamela [4].

Biogeography and ecological niche evolution in Diapensiaceae inferred from phylogenetic analysis.

Diapensiaceae (Ericales) are a small family of about 15 species. Within this clade, two species are broadly distributed throughout the Northern Hemisphere, while the remaining species have a disjunct distribution between eastern North America and eastern Asia. To address patterns and processes of diversification in Diapensiaceae, we conducted biogeographic analyses and inferred shifts in ecological niche across the phylogeny of the clade. Although Diapensiaceae have been the focus of multiple phylogenetic and biogeographic studies, previous studies were taxonomically limited. We greatly improve the phylogenetic underpinning for Diapensiaceae with the most inclusive taxonomic sampling thus far, employing both nuclear and plastid gene sequence data for at least one sample per species in the family. Our estimates indicate that genera of Diapensiaceae variously diverged in the Eocene, Oligocene, and early to mid-Miocene. Biogeographic analysis suggests that the probable ancestor of the Diapensiaceae crown clade originated in the Nearctic, with vicariance events contributing to the current distribution of the disjunct taxa. Ecological niche, when considered in a phylogenetic context, clustered based on biogeographic realm. In general, greater ecological overlap was found at younger nodes and greater niche divergence was found among distantly related species. Diversification in Diapensiaceae appears to have been shaped by both large-scale biogeographic factors, such as vicariance, and divergence in ecological niche among closely related species.

1 - University Of Florida, Florida Museum Of Natural History, Gainesville, FL, 32611, USA
2 - Chinese Academy of Sciences, Kunming Institute of Botany, Kunming, Yunnan, 650201, China
3 - 20 Nanxincun, Xiangshan, Beijing, 100093, China
4 - University Of Florida, Florida Museum Of Natural History, Dickinson Hall, Gainesville, FL, 32611, United States
5 - University Of Florida, Florida Museum Of Natural History, Dickinson Hall, Gainesville, FL, 32611, United States

Keywords:
Diapensiaceae
Angiosperm353
climatic niche
ecological niche modelling.

Presentation Type: Oral Paper
Session: PHYL2, Phylogenomics II
Location: Virtual/Virtual
Date: Wednesday, July 29th, 2020
Time: 1:15 PM
Number: PHYL2004
Abstract ID:500
Candidate for Awards:None