Phylogeography of an endangered disjunct herb: long-distance dispersal, refugia and colonization routes
| Autor: | Javier Bobo-Pinilla, Sonia Mediavilla, M. Montserrat Martínez-Ortega, Julio Peñas de Giles, Noemí López-González |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Western Mediterranean
2417.20-1 Taxonomía Vegetal. Plantas Vasculares 0106 biological sciences 0301 basic medicine AFLP DNA Plant LDD Endangered species Introduced species Plant Science filogeografía Biology Disjunct 010603 evolutionary biology 01 natural sciences 03 medical and health sciences Macaronesian area Western Mediterranean–Macaronesian area Glacial period Endemism Plastid DNA Genetic diversity Ecology Astragalus edulis ADN de plantas Phylogeography 030104 developmental biology Biological dispersal Palaeogeographical models |
| Zdroj: | Digibug. Repositorio Institucional de la Universidad de Granada instname GREDOS. Repositorio Institucional de la Universidad de Salamanca |
| Popis: | Quaternary glacial cycles appear to have had a consistent role in shaping the genetic diversity and structure of plant species. Despite the unusual combination of the characteristics of the western Mediterranean– Macaronesian area, there are no studies that have specifically examined the effects of palaeoclimatic and palaeogeographic factors on the genetic composition and structure of annual herbs. Astragalus edulis is a disjunct endemic found in the easternmost Canary Islands and the semi-arid areas of north-eastern Africa and south-eastern Iberian Peninsula. This endangered species shows no evident adaptations to long-distance dispersal. Amplified fragment length polymorphism (AFLP) data and plastid DNA sequences were analysed from a total of 360 individuals distributed throughout the range of this species. The modelled potential distribution of A. edulis under current conditions was projected over the climatic conditions of the Last Interglacial (130 ka BP) and Last Glacial Maximum (21 ka BP) to analyse changes in habitat suitability and to look for associations between the modelling and genetic results. Amplified fragment length polymorphism analysis showed clear phylogeographic structure with four distinct genetic clusters. Approximate Bayesian computation (ABC) models based on plastid DNA sequences indicated a Middle Pleistocene long-distance dispersal event as the origin of the populations of the Canary Islands. The models also suggested south-western Morocco as the ancestral area for the species, as well as subsequent colonization of north-eastern Morocco and the Iberian Peninsula. The data compiled indicated the possibility of the presence of refuge areas at favourable locations around the High Atlas and Anti-Atlas mountain ranges. Moreover, palaeodistribution models strongly support the events inferred by ABC modelling and show the potential distribution of the species in the past, suggesting a putative colonization route. This work has been financed by the Spanish Ministerio de Ciencia e Innovación through the projects CGL2012- 32574 and REN2003-09427, as well as by the Andalusian Consejería de Innovación, Ciencia y Tecnología through the project RNM1067. The funders had no role in study design, data collection and analysis, decision to publish or preparation of the manuscript. |
| Databáze: | OpenAIRE |
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