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Scale‐dependent changes in tree diversity over more than a century in eastern Canada : landscape diversification and regional homogenization

Danneyrolles Victor, Vellend Mark, Dupuis Sébastien, Boucher Yan, Laflamme Jason, Bergeron Yves, Fortin Gabriel, Leroyer Marie, Römer André, Terrail Raphaële et Arseneault Dominique. (2021). Scale‐dependent changes in tree diversity over more than a century in eastern Canada : landscape diversification and regional homogenization. Journal of Ecology, 109, (1), p. 273-283.

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URL officielle: http://dx.doi.org/doi:10.1111/1365-2745.13474

Résumé

A better understanding of how disturbance impacts tree diversity at different scales is essential for our ability to conserve and manage forest ecosystems in the context of global changes. Here we test the impacts of land use-related disturbances on tree diversity since the 19th century across a broad region (>150,000 km2) of northern temperate forests in eastern Canada. We used a large and unique dataset of early land surveys conducted during the 19th century (>130,000 species lists), along with modern forest inventories (>80,000 plots), to analyse long-term changes in taxonomic and functional tree diversity at several scales (grid cell resolutions ranging from 12.5 to 1,600 km2; we refer to one grid cell as a ‘landscape’). Our results show that land use-related disturbances have led simultaneously to (a) increased diversity within landscapes and a (b) homogenization at the regional scale (i.e. decreased composition dissimilarity among landscapes). These trends were found for both taxonomic diversity and functional diversity, with temporal changes more pronounced for taxonomic than functional diversity. We also found an increase over time in the strength of correlations between environmental variables and diversity both within and among landscapes. Synthesis. Our results support the idea that human-induced impacts on biodiversity are strongly scale-dependent and not necessarily associated with biodiversity loss. This highlights possible ways that human-driven changes in tree diversity might impact forest resistance and resilience to future global changes.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0022-0477
Volume:109
Numéro:1
Pages:p. 273-283
Version évaluée par les pairs:Oui
Date:2021
Identifiant unique:10.1111/1365-2745.13474
Sujets:Sciences naturelles et génie > Sciences appliquées > Foresterie et sciences du bois
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:beta diversity, biotic homogenization, pre-colonial forests, pre-industrial forests, pre-settlement forests
Déposé le:13 déc. 2022 15:09
Dernière modification:13 déc. 2022 15:09
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