Butterflies are expanding their global range due to climate change, according to a major international study that reveals climate-driven shifts are already reshaping biodiversity on a global scale. Published in Nature Ecology & Evolution, the research analyzed 6,182 range-shift records covering 1,758 butterfly species across 105 countries, making it one of the most extensive analyses of butterfly distribution ever conducted. The findings show that one in every 10 butterfly species worldwide has changed its geographic range, with rising temperatures and extreme weather emerging as the primary drivers.

Landmark Study Tracks Butterfly Movement Over Continents

The research was led by Monash University with contributions from scientists including Dr. Upama Aich from The University of Western Australia. To build a global picture, researchers combined English and non-English scientific literature with 68 expert assessments, creating an extensive database of butterfly distribution changes.

According to the study, climate change and extreme weather were responsible for nearly 80% of the observed range expansions, as butterflies increasingly moved into regions that have become climatically suitable due to rising temperatures.

Key Findings at a Glance

Climate Change Is Changing Butterfly Habitats

The study found that butterflies are expanding their global range due to climate change, but the changes are far more complex than simple northward movement.

• While many species expanded into new habitats, 27% experienced shrinking distribution ranges, indicating that not every butterfly benefits from changing environmental conditions.
• Researchers also found that 22% of species shifted to different elevations, particularly in mountainous regions.
• However, tropical butterflies showed relatively few documented elevational shifts, raising concerns because many tropical species have narrow temperature tolerances and may be more vulnerable to continued warming.

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Europe Shows Strong Evidence, But Global Data Gaps Remain

Scientists observed documented butterfly range shifts on every continent.

• Five European countries the Czech Republic, Finland, Luxembourg, Spain, and Sweden recorded range changes in more than half of their butterfly species, reflecting the availability of long-term biodiversity monitoring.
• Looking more broadly, researchers found that 32 countries had documented shifts in at least a quarter of their butterfly species, while 10 countries reported changes in more than half of their known species.
• Despite these outcomes, major knowledge gaps remain in biodiversity-rich regions such as Central Africa, Southeast Asia, New Guinea, and the Amazon Basin, where long-term monitoring data are still limited.

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Scientists Call for Better Global Biodiversity Monitoring

Lead author Dr. Shawan Chowdhury said the study shows how rapidly natural ecosystems are changing while also exposing weaknesses in global biodiversity monitoring systems.

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