Andrea Modica's PhD thesis

Genetic bases of microgeographic adaptation in European beech (Fagus sylvatica L.) and modelling of its evolutionary response to environmental gradient and climate change

Andrea Modica defended his PhD thesis in December 2024.

Andrea has studied how molecular adaptation unfolded in beech populations on Mont ventoux, southern France, European Union.

AModicaThesisFig21
Map of modern day coverage of beech on Mont Ventoux, highlighting the old growth area and the area colonised since 1860

Having shown that genetic change occurred fast, while the forest expanded downhill from its minimum extent at the end of the Nineteenth century (Modica et al. 2024), he moved to study the genetic bases of a trait, budburst, that had been proven to be under divergent selection in the same stands by Gaüzère et al. (2020)
He found multiple genomic loci controlling the trait in a GWAS analysis based on wild populations, and a preliminary genomic prediction approach allowed him to predict that countergradient geographical trends in individual breeding values mimic observations of trait values in common gardens, as assessed by Gaüzère et al. (2020), with earlier predicted budburst in higher-elevation stands.

AModicaThesisChap3fig1
Distribution of breeding values by population for character BBCH 7 (Day of appearance of stage BBCH 7), year 2009, FDR 5%. The absolute breeding values are arbitrary.

Check out the thesis itself (in English)