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Genetic effects of chronic habitat fragmentation revisited: Strong genetic structure in a temperate tree, Taxus baccata (Taxaceae), with great dispersal capability

Dubreuil, Marta ; Riba, Miquel ; González-Martínez, Santiago C ; Vendramin, Giovanni G ; Sebastiani, Federico ; Mayol, Maria

American journal of botany, 2010-02, Vol.97 (2), p.303-310 [Periódico revisado por pares]

United States: Botanical Society of America

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Título:
Genetic effects of chronic habitat fragmentation revisited: Strong genetic structure in a temperate tree, Taxus baccata (Taxaceae), with great dispersal capability
Autor: Dubreuil, Marta ; Riba, Miquel ; González-Martínez, Santiago C ; Vendramin, Giovanni G ; Sebastiani, Federico ; Mayol, Maria
Assuntos: adverse effects ; age structure ; Alleles ; Botany ; Conservation biology ; Dispersal ; Ecological genetics ; Evolutionary genetics ; forest fragmentation ; Forest genetics ; forests ; gene flow ; Genetics ; Habitat fragmentation ; habitats ; inbreeding ; landscapes ; Life Sciences ; long term effects ; longevity ; microsatellites ; Molecular biology ; Molecular structure ; mountains ; Nonnative species ; outcrossing ; Plant populations ; Population Biology ; Population ecology ; Population genetics ; Population structure ; prediction ; recruitment ; seed dispersal ; Seeds ; spatial genetic structure ; species dispersal ; Taxaceae ; Taxus baccata ; temperate zones ; Trees
É parte de: American journal of botany, 2010-02, Vol.97 (2), p.303-310
Notas: We are grateful to J. M. Espelta and A. Rodrigo for kindly providing part of the data for the TM population. We also thank A. Briz, A. Juarez, and O. Verdeny for field assistance. This research was supported by funds from the Spanish Ministry of Education and Science (Projects CGL2007‐63107/BOS and Consolider‐Ingenio Montes CSD2008‐00040), the National Park Autonomous Organism (Spanish Ministry of Environment, Project 26/2007), and Generalitat de Catalunya (Emergent Research Group 2005SGR00381), and by a grant (2004FI01255) from DURSI (Departament d'Universitats, Recerca i Societat de la Informació, Generalitat de Catalunya) to M.D.
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Descrição: Tree species are thought to be relatively resistant to habitat fragmentation because of their longevity and their aptitude for extensive gene flow, although recent empirical studies have reported negative genetic consequences, in particular after long-term habitat fragmentation in European temperate regions. Yet the response of each species to habitat loss may differ greatly depending on their biological attributes, in particular seed dispersal ability. In this study, we used demographic and molecular data to investigate the genetic consequences of chronic habitat fragmentation in remnant populations of Taxus baccata in the Montseny Mountains, northeast Spain. The age structure of populations revealed demographic bottlenecks and recruitment events associated with exploitation and management practices. We found a strong genetic structure, both at the landscape and within-population levels. We also detected high levels of inbreeding for a strictly outcrossing species. Chronic forest fragmentation resulting from long-term exploitation in the Montseny Mountains seems the most plausible explanation for the strong genetic structure observed. Our results support the view that, contrary to some predictions, tree species are not buffered from the adverse effects of habitat fragmentation, even in the case of species with a high dispersal potential.
Editor: United States: Botanical Society of America
Idioma: Inglês

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Genetic effects of chronic habitat fragmentation revisited: Strong genetic structure in a temperate tree, Taxus baccata (Taxaceae), with great dispersal capability

Dubreuil, Marta ; Riba, Miquel ; González-Martínez, Santiago C ; Vendramin, Giovanni G ; Sebastiani, Federico ; Mayol, Maria

United States: Botanical Society of America

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