Facilitation and Competition Affecting the Regeneration of Quercus Pubescens Willd. Tonioli, M.; Escarré, J.; Lepart, J.; and Speranza, M. 8(3):380–391.
Facilitation and Competition Affecting the Regeneration of Quercus Pubescens Willd. [link]Paper  abstract   bibtex   
We investigated the effects of competition, abiotic factors and defoliation on the emergence, survival and growth of downy oak (Quercus pubescens Willd.). Acorns were sown in three types of vegetation (annuals, perennials, perennials and Brachypodium phoenicoides), combined with two abiotic factors (addition of water and nutrients, shade). Three months after emergence, three defoliation treatments were performed including the ablation of stem and leaves, removal of half of the leaves and removal of the half blade of each leaf. Seedlings from heavier acorns emerge more frequently and survive better after browsing than those with a lighter mass. The highest percentages of seedling emergence were observed in the plots with Brachypodium phoenicoides, showing a facilitative effect of grasses. Shade as well as water and nutrient addition increased the survival of seedlings after defoliation. Seedlings whose stems were cut had lower survival rates than controls. Competition with Brachypodium phoenicoides significantly decreased leaf biomass but did not increase the mortality of individuals. Overall, our results have shown that the effects of biotic factors may change from facilitation at emergence, to competition at the seedling stage. Finally, emergence, survival and the responses to herbivory depended on physical stress, and on the intensity and distribution of damage, while growth depended on the competitive conditions.
@article{tonioliFacilitationCompetitionAffecting2001,
  title = {Facilitation and Competition Affecting the Regeneration of {{Quercus}} Pubescens {{Willd}}.},
  author = {Tonioli, M. and Escarré, J. and Lepart, J. and Speranza, M.},
  date = {2001},
  journaltitle = {Ecoscience},
  volume = {8},
  pages = {380--391},
  url = {http://www.ecoscience.ulaval.ca/en/paper/facilitation-and-competition-affecting-the-regeneration-of-quercus-pubescens-willd},
  abstract = {We investigated the effects of competition, abiotic factors and defoliation on the emergence, survival and growth of downy oak (Quercus pubescens Willd.). Acorns were sown in three types of vegetation (annuals, perennials, perennials and Brachypodium phoenicoides), combined with two abiotic factors (addition of water and nutrients, shade). Three months after emergence, three defoliation treatments were performed including the ablation of stem and leaves, removal of half of the leaves and removal of the half blade of each leaf. Seedlings from heavier acorns emerge more frequently and survive better after browsing than those with a lighter mass. The highest percentages of seedling emergence were observed in the plots with Brachypodium phoenicoides, showing a facilitative effect of grasses. Shade as well as water and nutrient addition increased the survival of seedlings after defoliation. Seedlings whose stems were cut had lower survival rates than controls. Competition with Brachypodium phoenicoides significantly decreased leaf biomass but did not increase the mortality of individuals. Overall, our results have shown that the effects of biotic factors may change from facilitation at emergence, to competition at the seedling stage. Finally, emergence, survival and the responses to herbivory depended on physical stress, and on the intensity and distribution of damage, while growth depended on the competitive conditions.},
  keywords = {*imported-from-citeulike-INRMM,~INRMM-MiD:c-13799941,forest-regeneration,forest-resources,quercus-pubescens},
  number = {3}
}
Downloads: 0