Summary
Published in Ecology and Evolution 5(9): 1837-1853. https://doi.org/110.1002/ece3.1476
Understory species play a significant role in forest ecosystem dynamics. As such, species of the Ericaceae family have a major effect on the regeneration of tree species in boreal ecosystems. It is thus imperative to understand the ecological gradients controlling their distribution and abundance, so that their impacts can be taken into account in sustainable forest management. Using innovative analytical techniques from landscape ecology, we aimed to position, along ecological gradients, four Ericaceae found in the boreal forest of Quebec (Canada) (Rhododendron groenlandicum, Kalmia angustifolia, Chamaedaphne calyculata, and Vaccinium spp), to regionalize these species into landscape units relevant to forest management, and to estimate the relative importance of several ecological drivers (climate, disturbances, stand attributes, and physical environment) that control the species distribution and abundance. We conducted our study in boreal Quebec, over a study area covering 535,355 km2. We used data from 15,339 ecological survey plots and forest maps to characterize 1422 ecological districts covering the study region. We evaluated the relative proportion of each ericaceous species and explanatory variables at the district level. Vegetation and explanatory variables matrices were used to conduct redundancy, cluster, and variation partitioning analyses. We observed that ericaceous species are mainly distributed in the western part of the study area and each species has a distinct latitudinal and longitudinal gradient distribution. On the basis of these gradients, we delimited 10 homogeneous landscape units distinct in terms of ericaceous species abundance and environmental drivers. The distribution of the ericaceous species along ecological gradients is closely related to the overlaps between the four sets of explanatory variables considered. We conclude that the studied Ericaceae occupy specific positions along ecological gradients and possess a specific abundance and distribution controlled by the integration of multiple explanatory variables.
Sector(s):
Forests
Categorie(s):
Scientific Article
Theme(s):
Forest Ecology, Forestry Research, Forests
Departmental author(s):
Author(s)
THIFFAULT, Nelson, Pierre GRONDIN, Jean NOËL and Véronique POIRIER
Year of publication :
2015
Format :
PDF available upon request
How to get the publication :
Keywords :
Kalmia à feuilles étroites, éricacées, forêt boréale, écologie du paysage, analyse de redondance, airelle à feuille étroite, airelle fausse-myrtille, thé du Labrador, article scientifique de recherche forestière, Kalmia angustifolia, rhododendron groenlandicum, vaccinium myrtilloides, vaccinium angustifolium, Chamaedaphne calyculata, écologie forestière, forest ecology, boreal forest, ecological drivers, landscape ecology, redundancy analysis, ericaceous shrubs, Labrador tea, bilberry, blueberries
