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Abstract Detail


Systematics Section / ASPT

Oliva-Tejera, Felicia [1], Caujape-Castells, Juli [1], Navarro-Déniz, Josefa [1], Acebes-Ginovés, Juan Ramón [2], Bramwell, David [1], Reyes-Betancort, Alfredo [3], Naranjo-Suárez, José [1], Navarro-Valdivielso, Bernardo [1].

Evolutionary relationships among several endemic Canarian Lotus of section Pedrosia as inferred from allozyme data.

WE used the information in 17 allozyme loci of 1,326 individuals belonging to 39 populations that represent a thorough sampling of eight Canarian endemic species of Lotus plus 9 taxonomically uncertain populations that we coded Lotus sp. to (i) estimate their levels and apportionment of genetic variation, (ii) dispel the taxonomic and conservation controversies affecting the endangered Gran Canarian endemic L. kunkelii relative to L. lancerottensis from Fuerteventura and Lanzarote, (iii) assess the relationships among the Gran Canarian pine forest endemics L. holosericeus, L. genistoides, and L. spartioides, and (iv) weed out unlikely hypotheses bearing on general aspects of evolutionary divergence. Except for the endangered L. kunkelii, our estimates indicate that, in most taxa surveyed, levels of genetic variation are higher than those reported in other Canarian endemics and have been maintained despite a predominance of inbreeding for reproduction. The taxonomic assimilation of L. kunkelii to L. lancerottensis is unsupported by FST values, which indicate that this grouping would disrupt the genetic cohesion of the latter taxon, thereby conflicting with the definition of Evolutionarily Significant Unit and determining the consideration of L. kunkelii as a distinct species that deserves legal protection. In the species endemic to the Gran Canarian pine forests, our data hint at an incipient (yet probably taxonomically insufficient) reproductive isolation. The genetic similarity between L. genistoides, L. holosericeus and L. spartioides, together with the different behaviour of the populations collected under the designation Lotus sp., may have important taxonomic implications. On the whole, evolutionary divergence among the 39 populations was assessed using a Neighbor-Joining tree based on Rogers’ distance. The data discussed, which are part of the doctoral dissertation of FOT, were generated with the help of the computer program Transformer-3 (see ID:91).


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1 - Jardín Botánico Canario \"Viera y Clavijo\", Molecular Biodiversity Labs and DNA Bank, Ap. de correos 14 de Tafira Alta., Las Palmas de Gran Canaria, 35017, Spain
2 - Universidad de La Laguna, Facultad de Farmacia, Biología Vegetal, Universidad de La Laguna, La Laguna (Tenerife), 38071, Spain
3 - Jardín de Aclimatación de La Orotava, ICIA, C. Retama 2, Puerto de La Cruz (Tenerife), 38400, Spain

Keywords:
Lotus
allozymes
Canary Islands
Conservation
evolution
Taxonomy.

Presentation Type: Oral Paper:Papers for Sections
Session: 19-15
Location: 106/Ayres
Date: Monday, July 31st, 2006
Time: 5:00 PM
Abstract ID:142


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