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Inter- and intra-annual patterns of seed rain in the black spruce stands of Quebec, Canada

Rossi Sergio, Morin Hubert, Gionest François et Laprise Danielle. (2017). Inter- and intra-annual patterns of seed rain in the black spruce stands of Quebec, Canada. iForest - Biogeosciences and Forestry, 10, p. 189-195.

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URL officielle: http://dx.doi.org/doi:10.3832/ifor2145-009

Résumé

Divergent reproductive strategies of tree species generate differences in the dynamics of seed production and dispersion. The spatial and temporal variability in seed rain abundance and viability was monitored during the period 2000-2007 in four boreal stands in Quebec, Canada. The aim was to compare the inter-and intra-annual patterns of seed dispersal between species with diverging adaptive characteristics and reproductive strategies by testing the hypothesis that sympatric species can exhibit different patterns of seed dispersal according to specific ecological adaptations. The coefficient of variation (CV), representing the inter-annual variability in seed rain, was close to or higher than 1 in balsam fir (Abies balsamea [L.] P. Mill.) and white birch (Betula papyrifera Marsh.) and confirmed the mast seeding habit of the two species. In contrast, CV in black spruce (Picea mariana [Mill.] BSP) ranged between 0.24 and 0.54, indicating a more homogeneous inter-annual amount of seed dispersal because of its semiserotinous cones that preserve seeds for an indefinite period of time. The species showed divergent intra-annual patterns of seed dispersal. Most seed dispersal of the companion species was observed in September-November, while black spruce concentrated seed rain in spring, when the proportion of germinated seeds was higher. Boreal stands experience annual seed rains constituted by a gradual dispersal of seeds of different ages and originating from cones belonging to multiple cohorts. However, asynchronous seed rains in terms of quantity and quality can occur if companion species are associated to the dominant black spruce.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:1971-7458
Volume:10
Pages:p. 189-195
Version évaluée par les pairs:Oui
Date:2017
Sujets:Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Mots-clés:Balsam fir, fire, masting, regeneration, reproduction, seed viability, serotiny, white birch
Déposé le:21 juin 2017 15:01
Dernière modification:21 juin 2017 15:01
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