Abstract
An accurate estimation of the expected consequences of climate change requires the proper quantification of the effect of climate on current species distributions. Several interrelated sources of uncertainty may affect the likelihood of species distribution models (SDMs) to determine the relative importance of climate. Our aim was to assess the relationship between the influence of geographical background (GB) delimitation and that of subtracting the non-climate effects from the weight of climatic predictors to estimate the combined influence of these two factors on predictions in climate change scenarios. The distribution of 40 endemic mammals in Western Europe have been modeled by (i) using the whole territory of Western Europe as the GB and also specifically delimiting the GB with a geographical criterion and (ii) considering climatic predictors in addition to other non-climatic variables in order to extract the pure effect of climate. The models were used to quantify species’ sensitivity to new climate scenarios. Results showed discrepancies among the analytical approaches. Changes in distribution obtained by considering the pure effect of climate were lower than those obtained by considering the apparent effect, and GB-delimited models yielded higher changes than those trained in Western Europe. We evidence that climate weighting and GB delimitation have dramatic influences on the projections of models when transferred to new scenarios. We emphasize that scientific studies and derived adaptation policies based on SDMs without an explicit consideration of the GB and the weighting of the climate-related variables may be misleading and in need of revision.
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Acknowledgements
We would like to thank the Societas Europaea Mammalogica and Tony Mitchell-Jones for providing the distribution data used to prepare The Atlas of European Mammals. We are grateful to A. L. Márquez for her useful advice as regards the study of species sensitivity to climate change. Sally Newton kindly reviewed the manuscript for grammar.
Funding
P.A. is currently supported by the Spanish Ministerio de Economía y Competitividad (MINECO) and Universidad de Castilla-La Mancha (UCLM) through a Ramón y Cajal contract (RYC-2012-11970) and partly by the AGL2016-76358- R grant (MINECO-FEDER, UE). A. J.-V. was supported by the MINECO Ramón y Cajal Program (RYC-2013-14441). This work has been partially supported by the Spanish Ministry of Agriculture, Food and Environment, Spanish National Park’s Network, project 1098/2014.
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P.A. and R.R. conceived the initial idea; P.A. carried out the statistical analyses; P.A., A. J.-V., J.M.L., and R.R. participated in the discussion of the results and wrote the manuscript.
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Pelayo Acevedo is a researcher at the Instituto de Investigación en Recursos Cinegéticos (IREC), of the Universidad de Castilla-La Mancha. His interests include the study of factors affecting the distribution and abundance of pathogens, and their hosts and vectors, through fragmented habitats.
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Appendix S1 Map of the study area. Appendix S2 List of the study species and statistical parameters of the models. Appendix S3 Example of geographical background delimitation and predictions from species distribution models from the different analytical approaches. (DOCX 667 kb)
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Acevedo, P., Jiménez-Valverde, A., Lobo, J.M. et al. Predictor weighting and geographical background delimitation: two synergetic sources of uncertainty when assessing species sensitivity to climate change. Climatic Change 145, 131–143 (2017). https://doi.org/10.1007/s10584-017-2082-1
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DOI: https://doi.org/10.1007/s10584-017-2082-1