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Mol Ecol

Title:		Fine-scale environmental control of hybridization in oaks
Author(s):		Lagache L; Klein EK; Guichoux E; Petit RJ;
Address:		"INRA, UMR1202 Biogeco, F- 33610, Cestas, France; UMR1202 Biogeco, Univ. Bordeaux, F-33400, Talence, France"
Journal Title:		Mol Ecol
Year:		2013
Volume:		20121122
Issue:		2
Page Number:		423 - 436
DOI:		10.1111/mec.12121
ISSN/ISBN:		1365-294X (Electronic) 0962-1083 (Linking)
Abstract:		"Natural hybridization is attracting much interest in modern speciation and conservation biology studies, but the underlying mechanisms remain poorly understood. In particular, it is unclear why environmental changes often increase hybridization rates. To study this question, we surveyed mating events in a mixed oak stand and developed a spatially explicit individual-based hybridization model. This model, where hybridization is frequency-dependent, pollen is nonlimiting and which allows immigrant pollen to compete with local pollen, takes into account species-specific pollen dispersal and sexual barriers to hybridization. The consequences of pollen limitation on hybridization were studied using another simple model. The results indicate that environmental changes could increase hybridization rates through two distinct mechanisms. First, by disrupting the spatial organization of communities, they should decrease the proportion of conspecific pollen available for mating, thus increasing hybridization rates. Second, by decreasing the density of conspecifics, they should increase pollen limitation and thus hybridization rates, as a consequence of chance pollination predominating over deterministic pollen competition. Altogether, our results point to a need for considering hybridization events at the appropriate level of organization and provide new insights into why hybridization rates generally increase in disturbed environments"
Keywords:		"DNA, Plant/genetics *Environment Genotype *Hybridization, Genetic Models, Genetic Peptides, Cyclic Pollen/genetics Pollination/*genetics Quercus/*genetics;"
Notes:		"MedlineLagache, Lelia Klein, Etienne K Guichoux, Erwan Petit, Remy J eng Research Support, Non-U.S. Gov't England 2012/11/24 Mol Ecol. 2013 Jan; 22(2):423-36. doi: 10.1111/mec.12121. Epub 2012 Nov 22"