Butterflies across all inhabited continents are experiencing significant changes in their geographic ranges and elevations, according to research published in Nature Ecology & Evolution. The international study examined 1,758 species across 105 countries and found approximately one in 10 species have expanded or contracted their ranges or shifted to different altitudes. Researchers described the scale of change as “astonishing,” with climate change and extreme weather identified as primary drivers of these movements.
Approximately 80% of butterfly species that shifted their ranges experienced expansions, often relocating to newly suitable habitats as temperatures increase. Notable examples include the tawny coster butterfly, native to India, Bangladesh, and Sri Lanka, which entered Australia in 2012 and has advanced at a rate of 135 kilometers per year since then. Conversely, about 27% of species documented range contractions, disappearing from areas they formerly inhabited. The United Kingdom’s smallest butterfly, Cupido minimus, was among those experiencing reduced ranges. Geographic patterns showed range expansions occurring across all continents, particularly in tropical regions, while contractions concentrated primarily in Europe and North America. Elevation shifts were observed almost exclusively in the northern hemisphere.
Beyond climate change and severe weather, additional factors contributed to range modifications, including habitat loss and agricultural practices. In Germany, bog drainage eliminated much habitat for the cranberry fritillary butterfly. Romania experienced agricultural intensification that drove contraction of the Danube clouded yellow butterfly. Brazil’s blue butterfly Godartiana byses expanded northward from Rio de Janeiro and Bahia to São Paulo in response to climate warming. Some species underwent simultaneous expansion in certain geographic areas while contracting in others, creating uncertainty about their long-term conservation status.
Researchers emphasized the necessity for coordinated global monitoring systems to track butterfly movements and inform conservation strategies. One successful example emerged in Melbourne, where the Eltham copper butterfly, presumed extinct before its rediscovery, has shown recovery signs following decades of community-led habitat restoration and native plant replanting efforts. Ecological surveys recorded nearly a five-fold increase in larvae numbers on native plants, demonstrating the potential effectiveness of localized conservation initiatives.
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