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Abstract Detail


Testo, Weston [1], Sessa, Emily [2], Barrington, David [3].

The rise of the Andes promoted rapid diversification in Neotropical Phlegmariurus (Lycopodiaceae).

Tropical mountains are disproportionately biodiverse relative to their surface area, but the processes underlying the exceptional diversity of many groups in these regions remain understudied. In this talk, we examine the impact of the uplift of the Andes on the diversification of Phlegmariurus, a species-rich and ecologically diverse clade of lycophytes. To better understand the relationship between mountain building and the diversification of this group, we generated a time-calibrated phylogeny and estimated diversification rates for the genus. Using this phylogeny as a framework, we compared a set of macroevolutionary models that incorporated paleo-elevation data for the Andes to infer the relationship of the range's uplift and diversification rate shifts in the genus. These analyses were complemented with additional tests for correlations of lineage-diversification rates and features of each species' ecology and distribution: spatial range size, niche breadth, elevational range amplitude, and mean elevation. We demonstrate that the rise of the Andes is strongly associated with increased rates of diversification in Neotropical Phlegmariurus, especially during the last 10 million years. Relationships between lineage diversification rates and species' ecological attributes are also discussed. We highlight the usefulness of combined phylogenetic, geological, and ecological datasets and the promise of comparative models of environment-dependent diversification models in better understanding evolutionary radiations.

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1 - University Of Florida, 313 NW 2nd St, Gainesville, FL, 32601, United States
2 - University Of Florida, Biology, Box 118525, Gainesville, FL, 32611, United States
3 - University Of Vermont, Plant Biology, 111 Jeffords Hall, 63 Carrigan Drive, Burlington, VT, 05405, United States

Rapid radiation

Presentation Type: Oral Paper
Session: 18, Macroevolution I
Location: 105/Mayo Civic Center
Date: Tuesday, July 24th, 2018
Time: 9:00 AM
Number: 18005
Abstract ID:275
Candidate for Awards:None

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