Abstract Detail

Beringia!: Current Insights on the Geology, Climate, Paleontology, Floristic Assembly, and Biodiversity of a Subcontinent that is Central to Northern Hemisphere Biogeography

Xiang, Qiuyun (Jenny) [1], Ickert-Bond, Steffi [2], Zhao, Lijun [1], Kepler, Lenora [3], Schoonmaker, Ashley [3], Yue, Jipei [1], Harris, AJ [4].

On a new global synthesis of the assembly of the northern hemispheric phytogeography by integrating paleobiome structure, connectivity and paleogeography in historical biogeography – the role of Beringia.

The phytogeography of the Northern Hemisphere exhibits several discontinuous distribution patterns of Cenozoic relics in two or more of the following regions: eastern Asia, eastern North America, western North America, southwestern Asia and/or southeastern Europe. The formation of such disjunct distributions have long been an interest of study. A global synthesis via meta-analyses of historical biogeography of disjunct lineages using DIVA nearly 20 years ago revealed an “out of Asia” migration as the major pattern while the area(s) of origin and dispersal of many lineages remained unresolved due to uncertainties in phylogeny and/or equally parsimonious alternative hypotheses. Trans-Beringian migration in the Miocene was suggested to be the major pattern of intercontinental dispersals of disjunct lineages. Although many more recent biogeographic analyses have been conducted for individual lineages to elucidate their biogeographic histories, the studies differed in methodology and many did not integrate paleogeographic and/or paleobiome structures into the process of analysis to constrain inter-areal dispersals. After the last global synthesis, new algorithms in historical biogeography have been developed that permit the integration of paleogeographic and paleobiome structure and connectivity, and divergence times for inferring ancestral ranges and paleobiome dynamics. Furthermore, advancements in DNA sequencing technology and phylogenetic methods and algorithms have enabled reconstruction of better-supported phylogenies using multiple to genome-wide loci as the basis of biogeographic analysis of disjunct lineages. In this study, we take a global approach and conduct biogeographic analyses using molecular data from multiple loci or genome-wide loci for as many taxa as possible available in public databases. We use the phylogenetic biome shift model of Landis et al. (2021) to reconstruct the biogeographic histories of disjunct lineages in the Northern Hemisphere. In the phylogenetic biome shift model each lineage shifts between biomes and disperses between regions at rates that depend on the lineage’s biome affinity and location relative to the spatial distribution of the biomes at any given time. We build a computer pipeline to perform analyses from DNA sequence alignment, phylogenetic analyses, divergence time dating, to phylogenetic biome shift modeling for streamline processing data allowing customizing parameters at each step for individual disjunct lineages.

1 - North Carolina State University, Plant And Microbial Biology, 100 Derieux Place, Gardner Hall 2115, Raleigh, NC, 27695, United States
2 - University Of Alaska Fairbanks, Herbarium (ALA) And Dept. Of Biology And Wildlife, University Of Alaska Fairbanks, 1962 Yukon Dr., Fairbanks, AK, 99775, United States
3 - North Carolina State University, Bioinformatics Research Center, 335 Ricks Hall, Campus box 7566, Raleigh, NC, 27607, USA
4 - South China Botanical Garden, Chinese Academy Of Sciences, Xingke Road 723, Tianhe District, Guangzhou, 44, 510650, China

Phytogeography of Northern Hemisphere
Historical biogeography
Biome shift
Origin of floristic disjunction.

Presentation Type: Symposium Presentation
Number: S1008
Abstract ID:174
Candidate for Awards:None

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