A trip of a bamboo lifetime: tracing the origin and evolution of Chusquea (Poaceae, Bambusoideae, Bambuseae) in Patagonia, southernmost South America

Author:

Guerreiro Carolina12,Brignone Nicolás F132,Clark Lynn G4,Vega Andrea S52

Affiliation:

1. Instituto de Botánica Darwinion (CONICET-ANCEFyN) , Labarden 200, B1642HYD San Isidro, Buenos Aires , Argentina

2. CONICET . Buenos Aires , Argentina

3. Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Belgrano , Villanueva 1324, C1426BMJ Belgrano, Ciudad Autónoma de Buenos Aires , Argentina

4. Department of Ecology, Evolution, and Organismal Biology, Iowa State University , Ames, Iowa 50011-4009 , USA

5. Universidad de Buenos Aires, Facultad de Agronomía, Departamento de Recursos Naturales y Ambiente, Cátedra de Botánica General , Av. San Martín 4453, C1417DSE, Buenos Aires , Argentina

Abstract

Abstract We performed a phylogenetic analysis with estimated clade ages and an ancestral-range estimation focused on the Patagonian species of Chusquea, i.e. the Chusquea culeou clade, to unravel their biogeographical history. Phylogenetic analyses were conducted with sequence data from four plastid markers, using maximum parsimony and Bayesian inference approaches. The complete sampling and addition of the Patagonian Chusquea species into a phylogenetic framework revealed the most likely origin and evolutionary history of the Chusquea culeou clade. The Patagonian Chusquea originated roughly 11.35 Mya, most likely from a common ancestor from the Atlantic Forest region, when this lineage underwent in situ diversification and its species evolved sympatrically. All the extant species have arisen in the last 8 Myr. Moreover, according to the present sampling, the most recent common ancestor of subtribe Chusqueinae originated in the Northern Andes, which is also the most common source area of the estimated dispersal events. Some other preliminary insights on the biogeographic history of the genus are included.

Funder

UBACyT

Publisher

Oxford University Press (OUP)

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