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CR 73:207-216 (2017)  -  DOI:

Thermal niche predicts recent changes in range size for bird species

Davide Scridel1,2,*, Giuseppe Bogliani2, Paolo Pedrini1, Aaron Iemma1, Achaz von Hardenberg3, Mattia Brambilla1,4

1Museo delle Scienze, Sezione Zoologia dei Vertebrati, Corso della Scienza e del Lavoro 3, 38123 Trento, Italy
2Università degli Studi di Pavia, Dipartimento di Scienze della Terra e dell’Ambiente, Via Adolfo Ferrata 9, 27100, Pavia, Italy
3Conservation Biology Research Group, Department of Biological Sciences, University of Chester, Parkgate Road, Chester CH1 4BJ, UK
4Fondazione Lombardia per l’Ambiente, Settore Biodiversità e Aree protette, Largo 10 luglio 1976 1, 20822 Seveso, MB, Italy

ABSTRACT: Species’ distributions are strongly affected by climate, and climate change is affecting species and populations. Thermal niches are widely used as proxies for estimating thermal sensitivity of species, and have been frequently related to community composition, population trends and latitudinal/elevational shifts in distribution. To our knowledge, no work has yet explored the relationship between thermal niche and change in range size (changes in the number of occupied spatial units over time) in birds. In this study, we related a 30 yr change in range size to species thermal index (STI: average temperature at occurrence sites) and to other factors (i.e. birds’ associated habitats, body mass, hunting status) potentially affecting bird populations/range size. We analysed trends of breeding bird range in Italy for a suite of poorly studied cold-adapted animals potentially sensitive to global warming, and for a related group of control species taxonomically similar and with comparable mass but mainly occurring at lower/warmer sites. We found a strong positive correlation between change in range size and STI, confirming that recent climatic warming has favoured species of warmer climates and adversely affected species occupying colder areas. A model including STI and birds’ associated habitats was not so strongly supported, with forest species performing better than alpine open habitat and agricultural ones. In line with previous works highlighting effects of recent climate change on community composition, species’ population trends and poleward/upward distributional shifts, we found STI to be the most important predictor of change in range size variation in breeding birds.

KEY WORDS: Climate change · Mountain · Cold-dwelling · Warm-dwelling · Alps

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Cite this article as: Scridel D, Bogliani G, Pedrini P, Iemma A, von Hardenberg A, Brambilla M (2017) Thermal niche predicts recent changes in range size for bird species. Clim Res 73:207-216.

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