Outcomes of biotic interactions are dependent on multiple environmental variables

Détails

ID Serval
serval:BIB_F98C9741A68C
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Outcomes of biotic interactions are dependent on multiple environmental variables
Périodique
Journal of Vegetation Science
Auteur(s)
Mod H.K., le Roux P.C., Luoto M.
ISSN
1654-1103
ISSN-L
1100-9233
Statut éditorial
Publié
Date de publication
2014
Peer-reviewed
Oui
Volume
25
Numéro
4
Pages
1024-1032
Langue
anglais
Résumé
Question: Can variation in the outcome of biotic interactions in relation to environmental severity be more accurately predicted when considering multiple stress and/or disturbance variables?
Location: Arctic-alpine tundra in Kilpisjarvi, North Finland.
Methods: To test the impact of including multiple environmental variables in analyses of the outcomes of biotic interactions, we modelled reproductive effort and cover of 17 arctic-alpine species as a function of Empetrum nigrum subsp. hermaphroditum cover, geomorphological disturbance and soil moisture with statistical interactions of the explanatory variables included. We implemented a best-subset approach using generalized linear models (GLM) and selected the best model for each species based on Akaike's information criterion (AIC).
Results: For the majority of species, models including multiple environmental variables were selected as best. Reproductive effort depended on one or both environmental variables for all species, and 14 species were additionally influenced by Empetrum, with the impact of Empetrum varying with abiotic conditions in all but one of those species. Moreover, the three-way interaction of three explanatory variables was included in the best-fit models for six species. The impact of Empetrum on species cover showed a similar pattern, with 11 species affected by Empetrum and its statistical interactions with one or both abiotic variables.
Conclusions: Biotic interactions have an important role in arctic-alpine vegetation, but to fully understand variation in their effects multiple environmental factors should be explicitly considered. In this study, the outcome of biotic interactions was frequently dependent on two abiotic variables (and occasionally additionally on their statistical interaction). Therefore, we demonstrate that studies based on only one environmental factor may cause misleading interpretations of the nature of biotic interactions in plant communities where there are multiple independent variables underlying the habitat severity gradient.
Mots-clé
Competition, Empetrum nigrum subsp hermaphroditum, Facilitation, Plant-plant interactions, Reproductive effort, Stress-gradient hypothesis
Web of science
Création de la notice
02/08/2017 16:53
Dernière modification de la notice
20/08/2019 17:25
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