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Abstract Detail

Modeling the processes that mediate speciation and extinction rates across plants

Frost, Laura [1], Santamaria, Daniel [1], Lagomarsino, Laura [2].

Freziera (Pentaphylaceae) reveal differing but complementary diversification dynamics in northern versus central Andean cloud forests.

Understanding diversification dynamics of Andean cloud forest lineages progresses our understanding of how this biome became one of the world’s most diverse. While many of the charismatic cloud forest radiations exhibit repeated shifts in life history traits (e.g., shifts between guilds of specialized pollinators or reproductive systems) or the evolution of key innovations (e.g., epiphytism and/or co-adaptations with pollinators like hummingbirds and euglossine bees), focusing on lineages without these confounding factors helps elucidate the patterns of diversification driven by abiotic factors. The genus Freziera comprises 75 spp. of mid- to high-elevation cloud forest trees and shrubs that share a generalist, invertebrate pollination syndrome and bird-dispersed fleshy berries.The vast majority of species occur in the Andes—about 10 spp. are distributed in other regions of the Neotropics—and diversity is nearly evenly split between the northern and the central Andes. Utilizing the first phylogeny generated for Freziera, a combination of historical biogeographic inference, climate data, and character-free, character-dependent, and geographic state speciation and extinction (SSE) models are used to examine diversification in the northern and central Andes. Though SSE models are typically applied to large phylogenies (>200 taxa) we demonstrate their utility for estimating rates in a relatively small group. We find differing, yet complementary patterns in the two regions. The northern Andes were the site of a rapid ancestral radiation possibly via niche differentiation, but diversification rates have slowed through time. The northern Andes additionally acted as a species pump with repeated dispersal to the central Andes where movement between climatically similar areas has maintained higher rates of diversification toward the present. Though seemingly unremarkable when compared to other cloud forest radiations, Freziera provides useful insight into the processes that drive radiation in this understudied habitat within a global biodiversity hotspot.

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1 - Louisiana State University, Department Of Biological Sciences, 202 Life Sciences Building, Baton Rouge, LA, 70803, United States
2 - Louisiana State University, Dept Of Biological Sciences, 103 Life Sciences Building, Baton Rouge, LA, 70803, United States

state-dependent speciation and extinction
montane tropical forest

Presentation Type: Colloquium Presentations
Session: C01, Modeling the processes that mediate speciation and extinction rates across plants
Location: /
Date: Monday, July 19th, 2021
Time: 11:45 AM(EDT)
Number: C01007
Abstract ID:1074
Candidate for Awards:None

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