1 in 10 Butterfly Species Shifting Range Under Climate Change
A study finds ~1 in 10 butterfly species shifts geographic range or elevation due to environmental change. Drivers: warming pushes movement to higher latitudes/altitudes, phenology mismatch with host plants, drought/heat loss of plants and water, and extreme-weather habitat loss. Survival impacts include shortened migration, population decline and range contraction/fragmentation; some expand in one direction while disappearing elsewhere. Shrinking ranges are documented in Europe/North America; elevation shifts mainly in the Northern Hemisphere. Examples: Tawny Coster (India-Sri Lanka-Bangladesh) spread across Australia ~135 km/year since 2012; Godartiana byses expanded south in Brazil; UK Small Blue contracted; Germany Cranberry Fritillary declined with peat-bog drainage; Romania Danube Clouded Yellow shrank due to intensive agriculture.




