A comprehensive global study published in Nature Ecology & Evolution examined range shifts in 1,758 butterfly species across 105 countries, revealing significant geographic movements linked primarily to climate change and extreme weather events. The research, led by Dr Shawan Chowdhury of Monash University’s Global Change Ecology Lab, found that about one in 10 species have already expanded or contracted their ranges or moved to different altitudes, demonstrating what researchers characterize as a dramatic transformation in butterfly distributions worldwide.
The findings indicate that approximately 80% of butterflies undergoing range shifts have expanded into new territories, often moving into areas that have become suitable habitats as global temperatures increase. However, expansion does not necessarily indicate positive outcomes, as some species moving into less suitable habitats may maintain low populations. 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. Conversely, about 27% of species have experienced range contractions, including the United Kingdom’s smallest butterfly, Cupido minimus, disappearing from previously inhabited areas. Range expansions occurred across all continents with particular concentration in tropical regions, while contractions were predominantly observed in Europe and North America. Elevation shifts were almost exclusively documented in the northern hemisphere.
Beyond climate factors, additional drivers of change include habitat loss and agricultural practices. The cranberry fritillary in Germany has lost significant original habitat due to bog drainage, while agricultural intensification in Romania has driven contraction in the Danube clouded yellow butterfly population. In Brazil, warming conditions have enabled the blue butterfly Godartiana byses to expand from Rio de Janeiro and Bahia states into São Paulo. Some species experienced simultaneous expansion in certain regions and contraction in others, creating uncertainty about long-term conservation outcomes.
Researchers emphasize the urgency of coordinated global monitoring systems, particularly in tropical regions, to track species movements and inform targeted conservation strategies. In a contrasting example of successful intervention, the Eltham copper butterfly in Melbourne, once thought extinct before its rediscovery in 1986, has demonstrated recovery through community-led habitat restoration efforts, with recent ecological surveys recording nearly a five-fold increase in larvae numbers on native plants.
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