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Abstract Detail


Spalink, Daniel [1], Larridon, Isabel [2], Roalson, Eric [3].

Ecological, biogeographic, and physiological drivers of diversification in Abildgaardieae (Cyperaceae).

The sedge (Cyperaceae) tribe Abildgaardieae is a diverse, primarily tropical lineage containing about 10% of all sedge species. Though the tribe is younger than 40 million years old, Abildgaardieae is cosmopolitan in distribution and has independently radiated in the savannas of the Americas, Africa, Madagascar, and Austro-Asia. Each of these radiations appears to involve edaphic diversification, pyromic conservation, and independent origins of C4photosynthesis. In this talk, we analyze the biogeographic diversification and assembly of Abildgaardieae in relation to soil, climate, fire, physiology, and physiognomy. Our results indicate that a single fire regime drives community assembly across the globe. Among all genera and in every continent in which they occur, high species richness is restricted to areas with long fire seasons and short fire return intervals. We discuss some of the morphological adaptations that have evolved, either in conjunction with or in response to, this specific fire regime. This pattern of community assembly is further influenced by edaphic diversity. Globally, Abildgaardieae have diversified onto more than 2000 soil types. We assess how the edaphic specialization is partitioned amongst clades and discuss the role of soil on the diversification of the tribe.

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1 - Texas A&M University, Ecosystem Science And Management, 2138 TAMU, College Station, TX, 77802, United States
2 - Royal Botanic Gardens Kew, Royal Botanic Gardens Kew, Royal Botanic Gardens Kew, Richmond, TW9 3AE, United Kingdom
3 - Washington State University, School Of Biological Sciences, Abelson Hall 339, Pullman, WA, 99164, United States

community assembly
Edaphic evolution
Niche Conservatism

Presentation Type: Oral Paper
Session: BIOG1, Biogeography I
Location: Tucson E/Starr Pass
Date: Monday, July 29th, 2019
Time: 10:15 AM
Number: BIOG1008
Abstract ID:452
Candidate for Awards:None

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