Accounting for niche truncation to improve spatial and temporal predictions of species distributions

Type Article
Date 2022-08
Language English
Author(s) Chevalier Mathieu1, 2, Zarzo-Arias Alejandra3, 4, Guélat Jérôme5, Mateo Rubén G.6, Guisan Antoine2, 7
Affiliation(s) 1 : Centre de Bretagne, DYNECO, Laboratoire d’Ecologie Benthique Côtière (LEBCO), IFREMER, Plouzané, France
2 : Department of Ecology and Evolution, University of Lausanne, Lausanne, Switzerland
3 : Department of Biogeography and Global Change, Museo Nacional de Ciencias Naturales (MNCN-CSIC), Madrid, Spain
4 : Department of Organisms and Systems Biology, Universidad de Oviedo, Oviedo, Spain
5 : Swiss Ornithological Institute, Sempach, Switzerland
6 : Department of Biology, Universidad Autónoma de Madrid, Madrid, Spain
7 : Institute of Earth Surface Dynamics, University of Lausanne, Lausanne, Switzerland
Source Frontiers In Ecology And Evolution (2296-701X) (Frontiers Media SA), 2022-08 , Vol. 10 , P. 944116 (14p.)
DOI 10.3389/fevo.2022.944116
WOS© Times Cited 6
Keyword(s) birds, climate change, predictions, range, spatial niche truncation, species distribution model (SDM), data integration

Species Distribution Models (SDMs) are essential tools for predicting climate change impact on species’ distributions and are commonly employed as an informative tool on which to base management and conservation actions. Focusing only on a part of the entire distribution of a species for fitting SDMs is a common approach. Yet, geographically restricting their range can result in considering only a subset of the species’ ecological niche (i.e., niche truncation) which could lead to biased spatial predictions of future climate change effects, particularly if future conditions belong to those parts of the species ecological niche that have been excluded for model fitting. The integration of large-scale distribution data encompassing the whole species range with more regional data can improve future predictions but comes along with challenges owing to the broader scale and/or lower quality usually associated with these data. Here, we compare future predictions obtained from a traditional SDM fitted on a regional dataset (Switzerland) to predictions obtained from data integration methods that combine regional and European datasets for several bird species breeding in Switzerland. Three models were fitted: a traditional SDM based only on regional data and thus not accounting for niche truncation, a data pooling model where the two datasets are merged without considering differences in extent or resolution, and a downscaling hierarchical approach that accounts for differences in extent and resolution. Results show that the traditional model leads to much larger predicted range changes (either positively or negatively) under climate change than both data integration methods. The traditional model also identified different variables as main drivers of species’ distribution compared to data-integration models. Differences between models regarding predicted range changes were larger for species where future conditions were outside the range of conditions existing in the regional dataset (i.e., when future conditions implied extrapolation). In conclusion, we showed that (i) models calibrated on a geographically restricted dataset provide markedly different predictions than data integration models and (ii) that these differences are at least partly explained by niche truncation. This suggests that using data integration methods could lead to more accurate predictions and more nuanced range changes than regional SDMs through a better characterization of species’ entire realized niches.

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