Uncertainties in the projection of species distributions related to general circulation models

• Published in: Ecology and Evolution
• Main Authors: Goberville, Eric, Beaugrand, Grégory, Hautekèete, Nina‐Coralie, Piquot, Yves, Luczak, Christophe
• Other Authors: Fondation pour la Recherche sur la Biodiversite
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2015
• Subjects: Dwarf birch
• Online Access: http://dx.doi.org/10.1002/ece3.1411; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fece3.1411; https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.1411

Abstract Ecological Niche Models ( ENM s) are increasingly used by ecologists to project species potential future distribution. However, the application of such models may be challenging, and some caveats have already been identified. While studies have generally shown that projections may be sensitive to the ENM applied or the emission scenario, to name just a few, the sensitivity of ENM ‐based scenarios to General Circulation Models ( GCM s) has been often underappreciated. Here, using a multi‐ GCM and multi‐emission scenario approach, we evaluated the variability in projected distributions under future climate conditions. We modeled the ecological realized niche ( sensu Hutchinson) and predicted the baseline distribution of species with contrasting spatial patterns and representative of two major functional groups of European trees: the dwarf birch and the sweet chestnut. Their future distributions were then projected onto future climatic conditions derived from seven GCM s and four emissions scenarios using the new Representative Concentration Pathways ( RCP s) developed for the Intergovernmental Panel on Climate Change ( IPCC ) AR 5 report. Uncertainties arising from GCM s and those resulting from emissions scenarios were quantified and compared. Our study reveals that scenarios of future species distribution exhibit broad differences, depending not only on emissions scenarios but also on GCM s. We found that the between‐ GCM variability was greater than the between‐ RCP variability for the next decades and both types of variability reached a similar level at the end of this century. Our result highlights that a combined multi‐ GCM and multi‐ RCP approach is needed to better consider potential trajectories and uncertainties in future species distributions. In all cases, between‐ GCM variability increases with the level of warming, and if nothing is done to alleviate global warming, future species spatial distribution may become more and more difficult to anticipate. When future species spatial distributions ...