A tale of North and South America: time and mode of dispersal of the amphitropical genus Munroa (Poaceae, Chloridoideae)

Authors
Amarilla, Leonardo; Chiapella, Jorge Oscar; Sosa, Victoria; Moreno, Natalia Cecilia; Anton, Ana Maria Ramona
Publication Year
2015
Language
English
Format
article
Status
Published version
Description
Plant disjunctions have provided some of the most intriguing distribution patterns historically addressed by biogeographers. We evaluated the three hypotheses that have been postulated to explain these patterns [vicariance, stepping-stone dispersal and long-distance dispersal (LDD)] using Munroa, an American genus of grasses with six species and a disjunct distribution between the desert regions of North and South America. Ages of clades, cytology and ancestral characters and areas of distribution were investigated in order to establish relationships among species, determine the time of divergence of the genus and its main lineages and understand further the biogeographic and evolutionary history of this genus. Bayesian inference recovered the North American M. pulchella as sister species to the rest. Molecular dating and ancestral area analyses suggest that Munroa originated in North America in the late Miocene-Pliocene (7.2; 8.2?6.5 Mya). Based on these results we postulate that two dispersal events modeled the current distribution patterns of Munroa; the first from North to South America (7.2; 8.2?6.5 Mya ago) and the second (1.8; 2?0.8 Mya ago) from South to North America. Arid conditions of the late Miocene-Pliocene in the Neogene and Quaternary climatic oscillations in North America and South America were probably advantageous for establishment of populations of Munroa. We did not find any relationship between ploidy and dispersal events and our ancestral character analyses suggest that shifts associated with dispersal and seedling establishment, such as habit, reproductive system, disarticulation of rachilla and shape and texture of the glume, have been important in these species reaching new areas.
Fil: Amarilla, Leonardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentina
Fil: Chiapella, Jorge Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentina
Fil: Sosa, Victoria. Consejo Nacional de Ciencia y Tecnología. Instituto de Ecología; México
Fil: Moreno, Natalia Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentina
Fil: Anton, Ana Maria Ramona. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentina
Subject
AMERICAN ARID LAND
AMPHITROPICAL DISJUNCTION
CHLORIDOIDEAE
HISTORICAL BIOGEOGRAPHY
LONG-DISTANCE DISPERSAL (LDD)
MOLECULAR PHYLOGENY
MUNROA
STEPPING-STONE DISPERSAL
VICARIANCE
Otras Ciencias Biológicas
Ciencias Biológicas
CIENCIAS NATURALES Y EXACTAS
Access level
Restricted access
License
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/41536