Rafael G Albaladejo1, Sara Martín-Hernanz1, J Alfredo Reyes-Betancort2, Arnoldo Santos-Guerra2, María Olangua-Corral3, Abelardo Aparicio1. 1. Departamento de Biología Vegetal y Ecología, Universidad de Sevilla, Sevilla, Spain. 2. Jardín de Aclimatación de la Orotava (Instituto Canario de Investigaciones Agrarias - ICIA), Puerto de la Cruz, Santa Cruz de Tenerife, Spain. 3. Departamento de Biología Reproductiva y Micro-morfología, Jardín Botánico Canario 'Viera y Clavijo'-Unidad Asociada CSIC (Cabildo de Gran Canaria), Las Palmas de Gran Canaria, Spain.
Abstract
BACKGROUND AND AIMS: Several biogeographical models have been proposed to explain the colonization and diversification patterns of Macaronesian lineages. In this study, we calculated the diversification rates and explored what model best explains the current distribution of the 15 species endemic to the Canary Islands belonging to Helianthemum sect. Helianthemum (Cistaceae). METHODS: We performed robust phylogenetic reconstructions based on genotyping-by-sequencing data and analysed the timing, biogeographical history and ecological niche conservatism of this endemic Canarian clade. KEY RESULTS: Our phylogenetic analyses provided strong support for the monophyly of this clade, and retrieved five lineages not currently restricted to a single island. The pristine colonization event took place in the Pleistocene (~1.82 Ma) via dispersal to Tenerife by a Mediterranean ancestor. CONCLUSIONS: The rapid and abundant diversification (0.75-1.85 species per million years) undergone by this Canarian clade seems the result of complex inter-island dispersal events followed by allopatric speciation driven mostly by niche conservatism, i.e. inter-island dispersal towards niches featuring similar environmental conditions. Nevertheless, significant instances of ecological niche shifts have also been observed in some lineages, making an important contribution to the overall diversification history of this clade.
BACKGROUND AND AIMS: Several biogeographical models have been proposed to explain the colonization and diversification patterns of Macaronesian lineages. In this study, we calculated the diversification rates and explored what model best explains the current distribution of the 15 species endemic to the Canary Islands belonging to Helianthemum sect. Helianthemum (Cistaceae). METHODS: We performed robust phylogenetic reconstructions based on genotyping-by-sequencing data and analysed the timing, biogeographical history and ecological niche conservatism of this endemic Canarian clade. KEY RESULTS: Our phylogenetic analyses provided strong support for the monophyly of this clade, and retrieved five lineages not currently restricted to a single island. The pristine colonization event took place in the Pleistocene (~1.82 Ma) via dispersal to Tenerife by a Mediterranean ancestor. CONCLUSIONS: The rapid and abundant diversification (0.75-1.85 species per million years) undergone by this Canarian clade seems the result of complex inter-island dispersal events followed by allopatric speciation driven mostly by niche conservatism, i.e. inter-island dispersal towards niches featuring similar environmental conditions. Nevertheless, significant instances of ecological niche shifts have also been observed in some lineages, making an important contribution to the overall diversification history of this clade.
Authors: Javier Francisco-Ortega; Javier Fuertes-Aguilar; Seung-Chul Kim; Arnoldo Santos-Guerra; Daniel J Crawford; Robert K Jansen Journal: Am J Bot Date: 2002-12 Impact factor: 3.844
Authors: Sara Martín-Hernanz; Sara Martínez-Sánchez; Rafael G Albaladejo; Juan Lorite; Juan Arroyo; Abelardo Aparicio Journal: Ecol Evol Date: 2019-03-05 Impact factor: 2.912
Authors: Priscila Rodríguez-Rodríguez; Alejandro G Fernández de Castro; Pedro Luis Pérez de Paz; Leticia Curbelo; Ángel Palomares; Ricardo Mesa; Aurelio Acevedo; Pedro A Sosa Journal: Am J Bot Date: 2022-03-15 Impact factor: 3.325