Comparison of direct and indirect genetic methods for estimating seed and pollen dispersal in Fagus sylvatica and Fagus crenata |
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Authors: | Sylvie Oddou-Muratorio Aurore Bontemps Etienne K. Klein Igor Chybicki Giovanni G. Vendramin Yoshihisa Suyama |
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Affiliation: | 1. INRA UR 629, Ecologie des Forêts Méditerranéennes, Domaine St Paul, Site Agroparc, F-84914 Avignon, France;2. INRA, UR 546, Biostatistique et Processus Spatiaux, Domaine St Paul, Site Agroparc, F-84914 Avignon, France;3. Uniwersytet Kazimierza Wielkiego, Department of Genetics, Chodkiewicza 30, 85-064 Bydgoszcz, Poland;4. CNR, Istituto di Genetica Vegetale, Via Madonna del Piano 10, I-50019 Sesto Fiorentino (Firenze), Italy;5. Graduate School of Agricultural Science, Tohoku University, 232-3 Yomogida, Naruko-Onsen, Osaki, Miyagi 989-6711, Japan |
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Abstract: | The comparison between estimates of historical gene flow, using variance in allelic frequencies, and estimates of contemporary gene flow, using parentage assignment, is expected to provide insights into ecological and evolutionary processes at work within and among populations. Genetic variation at microsatellite loci was used to quantify genetic structure in two wind pollinated, gravity and animal-dispersed tree species (Fagus sylvatica L. and Fagus crenata Blum.) and to derive historical estimates of gene flow. The gene dispersal distances estimated assuming effective population density to be 1/4 of the observed density were ∼77 m in European beech and ∼40 m in Japanese beech. Parentage analyses and a neighbourhood model approach were used to estimate contemporary patterns of seed and pollen dispersal. Our results suggest restricted seed dispersal abilities in both European beech (δs = 10.5 m) and Japanese beech (δs = 12.4 m), with an exponential shaped seed dispersal kernel. A non-negligible rate of seed immigration (ms = 27%) was detected in European beech sites but not in Japanese beech site. Pollen dispersal within studied sites also appeared limited (δp = 41.63 m in European beech and δp = 79.4 m in Japanese beech), despite high rate of pollen immigration (mp = 68% in European beech and mp = 40% m in Japanese beech). Interestingly, contemporary and historical estimates of gene flow were within the same order of magnitude (a few tens of meters). |
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Keywords: | Parentage analyses Neighbourhood model Spatial genetic structure Isolation by distance Dispersal kernel |
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