Late Cretaceous-Early Eocene origin of yams (Dioscorea, Dioscoreaceae) in the Laurasian Palaearctic and their subsequent Oligocene-Miocene diversification

Viruel, Juan ; Segarra-Moragues, José Gabriel ; Raz, Lauren Raz ; Forest, Félix ; Wilkin, Paul ; Sanmartín, Isabel ; Catalán, Pilar (Universidad de Zaragoza)

Resumen: Aim: Dioscorea (Dioscoreaceae) is a predominantly pantropical genus (< 600 species) that includes the third most important tropical tuber crop and species of pharmacological value. Fossil records from both the Northern and Southern Hemispheres were used to test hypotheses about the origin of the genus Dioscorea, and to examine potential macroevolutionary processes that led to its current distribution. Location: Pantropical distribution. Methods: Divergence times were estimated using the most comprehensive phylogeny of the group published to date based on plastid sequences and fossil calibrations, applying a relaxed-clock model approach. Ancestral areas and range shifts were reconstructed using time-stratified likelihood-based models, reflecting past continental connectivity and biogeographical models incorporating the spatial range of fossils. Results: Fossil-informed biogeographical analysis supported colonization of the Nearctic by ancient yam lineages from the western Palaearctic and subsequent migration to the South. Most of the pantropical South American, African and Southeast Asian lineages experienced a relatively recent diversification in the Oligocene-Miocene. Long-distance dispersals were inferred for the colonizations of the New World, Africa and Madagascar. Main conclusions: Dioscorea likely originated between the Late Cretaceous and the Early Eocene in the Laurasian Palaearctic, followed by possible dispersal to South America via the Eocene North Atlantic Land Bridge.

Idioma: Inglés

DOI: 10.1111/jbi.12678

Año: 2016

Publicado en: JOURNAL OF BIOGEOGRAPHY 43, 4 (2016), 750-762
ISSN: 0305-0270

Factor impacto JCR: 4.248 (2016)

Categ. JCR: GEOGRAPHY, PHYSICAL rank: 6 / 49 = 0.122 (2016) - Q1 - T1
Categ. JCR: ECOLOGY rank: 26 / 153 = 0.17 (2016) - Q1 - T1

Factor impacto SCIMAGO: 2.512 - Ecology, Evolution, Behavior and Systematics (Q1) - Ecology (Q1)

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Botánica (Dpto. CC.Agrar.y Medio Natural)