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    Climate change will seriously impact bird species dwelling above the treeline: A prospective study for the Italian Alps

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    Date
    2017
    Author
    Ferrarini, Alessandro
    Alatalo, Juha M.
    Gustin, Marco
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    Abstract
    High mountain systems are predicted to be especially vulnerable to the impact of climate change, with the climatically-constrained tree limit rapidly shifted upslope. In turn, the impact of upward treeline migration on mountain-dwelling bird species is expected to significantly reduce habitat suitability. We developed the first projection of the expected climate-driven rise of the whole treeline (19,256 km) of the Italian Alps. The study area extends over 20,700 km2, ranging over 550 km in longitude and 320 km in latitude. We then investigated how much the expected treeline rise will induce a) shrinking and shifting of the elevation range and b) loss in suitable habitat for the flagship species rock ptarmigan, an alpine bird species dwelling above the treeline and, similarly to many other alpine species, highly vulnerable to treeline rise. We also investigated the potential gain in suitable habitat for rock ptarmigan due to the climate-driven upshift in the uppermost thermal limit. At lower altitudes (1500–1600 m a.s.l.), the average expected upshift in the current treeline resulted in 195, 274 and 354 m over the short (2010–2039), medium (2040–2069) and long term (2070–2099) respectively. Above 2400 m a.s.l., it was less than 30 m even in the long term. Overall, during the three climate periods the extent of suitable habitat for rock ptarmigan above the current treeline is projected to decrease by 28.12%, 38.43% and 49.11% respectively. In contrast, the expected gain in suitable habitat due to the shift in the uppermost thermal limit will be severely restrained by the limited surface extension in the top portion of the Italian Alps. The presented approach can promote similar studies elsewhere in the globe, providing a regional perspective to the projection of climate change impact on bird species dwelling above the treeline.
    DOI/handle
    http://dx.doi.org/10.1016/j.scitotenv.2017.03.027
    http://hdl.handle.net/10576/17444
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