Naslov
Mechanisms of hybridization between closely related species: case study of the common ash (Fraxinus excelsior L.) and the narrow-leaved ash (Fraxinus angustifolia Vahl) in Europe

Autori
Temunović, Martina ; Gérard, Pierre ; Sannier, Julie ; Bertolino, Paola ; Dufour, Jean ; Frascaria-Lacoste, Nathalie ; Fernández-Manjarrés, Juan F.

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Knjiga sažetaka - 4. Hrvatski botanički simpozij s međunarodnim sudjelovanjem / Alegro, Antun ; Boršić, Igor - Split : Hrvatsko Botaničko Društvo, 2013

ISBN
978-953-99774-6-5

Skup
4. Hrvatski botanički simpozij s međunarodnim sudjelovanjem

Mjesto i datum
Split, Hrvatska, 27.09.2013. - 29.09.2013

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Europe; Fraxinus; hybrid zones; Oleaceae; species distribution models

Sažetak
Tree species can form hybrid zones over hundreds of kilometres which are often related to ecological conditions. The narrow-leaved ash and the common ash represent two widely distributed and closely related tree species with divergent ecological preferences. However, hybridization between the two species has been reported experimentally, as well as in nature in zones of sympatry. Therefore, they provide a valuable model for examining the possible mechanisms of hybridization between closely related species. The aims of this study were to identify geographical areas of sympatry between the two ash species predicted by ecological niche modelling at the continental scale, to examine the levels of molecular hybridization in such areas, and to determine the main ecological drivers responsible for the formation of hybrid zones. Population genetic structure analysis based on SSR and EST-SSR markers revealed two separate gene pools associated with the parental species, as well as a range of hybrid populations mostly found within the predicted niche overlap zones. Results suggest that the number of days of frost, summer precipitation and summer temperature are the main ecological factors potentially limiting the extent of the hybrid zones. However, at the continental scale, no clear pattern of hybridization can be assigned. Ecological conditions in southeastern Europe appear to be less favourable for the formation of the hybrids and the identified hybridization pattern seem to be asymmetrical with a bias towards the temperate areas of the western and northernmost distribution of F. angustifolia.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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