Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/41424
Title: Species delimitation and conservation genetics of the Canarian endemic Bethencourtia (Asteraceae)
Authors: Rodríguez Rodríguez, Priscila 
Pérez De Paz,Pedro Luis 
Sosa, Pedro A. 
UNESCO Clasification: 241714 Genética vegetal
Keywords: Canary Islands
Conservation genetics
Endemism
Genetic diversity
Microsatellites
Issue Date: 2018
Journal: Genetica 
Abstract: Bethencourtia Choisy ex Link is an endemic genus of the Canary Islands and comprises three species. Bethencourtia hermosae and Bethencourtia rupicola are restricted to La Gomera, while Bethencourtia palmensis is present in Tenerife and La Palma. Despite the morphological differences previously found between the species, there are still taxonomic incongruities in the group, with evident consequences for its monitoring and conservation. The objectives of this study were to define the species differentiation, perform population genetic analysis and propose conservation strategies for Bethencourtia. To achieve these objectives, we characterized 10 polymorphic SSR markers. Eleven natural populations (276 individuals) were analyzed (three for B. hermosae, five for B. rupicola and three for B. palmensis). The results obtained by AMOVA, PCoA and Bayesian analysis on STRUCTURE confirmed the evidence of well-structured groups corresponding to the three species. At the intra-specific level, B. hermosae and B. rupicola did not show a clear population structure, while B. palmensis was aggregated according to island of origin. This is consistent with self-incompatibility in the group and high gene flow within species. Overall, the genetic diversity of the three species was low, with expected heterozygosity values of 0.302 (B. hermosae), 0.382 (B. rupicola) and 0.454 (B. palmensis). Recent bottleneck events and a low number of individuals per population are probably the causes of the low genetic diversity. We consider that they are naturally rare species associated with specific habitats. The results given in this article will provide useful information to assist in conservation genetics programs for this endemic genus.
URI: http://hdl.handle.net/10553/41424
ISSN: 0016-6707
DOI: 10.1007/s10709-018-0013-3
Source: Genetica [ISSN 0016-6707], v. 146, p. 199-210
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