Century-long butterfly range expansions in northern Europe depend on climate, land use and species traits
2023
Sunde, Johanna | Franzén, Markus | Betzholtz, Per-Eric | Francioli, Yannick | Pettersson, Lars B. | Pöyry, Juha | Ryrholm, Nils | Forsman, Anders | Suomen ympäristökeskus | The Finnish Environment Institute | 0000-0002-5548-1046
Climate change is an important driver of range shifts and community composition changes. Still, little is known about how the responses are influenced by the combination of land use, species interactions and species traits. We integrate climate and distributional data for 131 butterfly species in Sweden and Finland and show that cumulative species richness has increased with increasing temperature over the past 120 years. Average provincial species richness increased by 64% (range 15–229%), from 46 to 70. The rate and direction of range expansions have not matched the temperature changes, in part because colonisations have been modified by other climatic variables, land use and vary according to species characteristics representing ecological generalisation and species interactions. Results emphasise the role of a broad ecological filtering, whereby a mismatch between environmental conditions and species preferences limit the ability to disperse and establish populations in emerging climates and novel areas, with potentially widespread implications for ecosystem functioning.
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