Ecological Aspects of the Floral Phenology of the Cork-Oak (Quercus suber L) / Why do Annual and Biennial Biotypes Appear? : Genetics of Oaks. IUFRO Proceedings

Arboretum National des Barres

1993

S. 114-121

11 Lit. Ang.

Unselbständiges Werk

200041654

Annales des Sciences Forestieres 1993 ; 50,Suppl 1, S. 114-121

Phenological observations (periods of flowering and pollination, floral structures, etc) were made over a 3-year period in natural populations of Quercus suber. We demonstrated the existence of 2 different types of seed cycles in the cork-oak. The 'annual biotype', requires only 1 season to complete its reproductive cycle (ie, similar to that of the Lepidobalanus group), whereas the 'biennial biotype' requires 2 full years (similar to Erythrobalanus). The variability observed in the cork-oak, during the reproductive cycle, and the meaning of the existence of 2 different reproductive strategies in the same species, are discussed.