Global analysis reveals 80% of butterfly species expand range with climate change
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A global analysis of 1,758 butterfly species finds 80% expanding their range, with 79% of range shifts attributed to climate change, according to a study published Aug. 8 in Nature Ecology & Evolution. The largest research of its kind, spanning 6,182 records across 105 countries, also documents range contractions for 27% of species and elevational shifts for 22%.
The Global Patterns
Horizontal range expansions were recorded on every continent, with particularly high numbers in tropical countries, while contractions appeared more frequently in temperate regions such as Europe and North America. Elevational shifts occurred almost exclusively in the Northern Hemisphere. The study, encompassing 1,758 species—10% of known butterfly species—found that multiple shift types often overlapped, pushing combined percentages above 100%. Dr. Shawan Chowdhury of Monash University said the scale is astonishing and noted that such shifts are happening far beyond the well-studied regions of Europe and North America.
Insufficient Monitoring
The study reveals stark disparities in documentation: in countries like the Czech Republic, Finland, and Spain, records exist for more than half of native butterfly species, but in most nations less than 10% are documented. The analysis drew on 6,182 range-shift records, including non-English scientific literature and 68 expert assessments, to build a uniquely comprehensive dataset. Dr. Aletta Bonn from the Helmholtz Center for Environmental Research emphasized that contributions from natural history societies and amateur experts were crucial for understanding global patterns.
Ecosystem Implications
Butterflies are considered early indicators of ecosystem change, and their dramatic range shifts suggest profound transformations underway. The study linked 79% of all recorded shifts directly to climate change and extreme weather events. With 1,758 species studied across 105 countries, it is the largest global analysis of its kind. Researchers warn that if butterfly ranges are shifting this rapidly, other insects and dependent species may soon experience similar disruptions.
What's Next
The research team urges expanded monitoring efforts, especially in under-studied tropical regions where data remain sparse. It remains unclear how these rapid range shifts will affect butterfly populations long-term, or whether other insect groups are undergoing similar large-scale transformations.
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Global analysis reveals 80% of butterfly species expand range with climate change
