As the world warms, butterflies are relocating at an astonishing scale
A sweeping new study of 1,758 butterfly species across 105 countries found many tropical species are expanding their ranges, while temperate ones are contracting—with climate change a major driver.
Butterflies across the globe are relocating at an astonishing rate as the planet warms, according to a recent study published in Nature Ecology & Evolution. Researchers found that roughly one in ten of the world's 19,000 butterfly species have shifted their ranges to different locations as the temperature changes. Lead author Shawan Chowdhury, from Monash University's Global Change Ecology Lab, highlighted the scale of butterfly range shifts observed across every continent where they occur, stating, "The scale is astonishing."
This study marks one of the most comprehensive accounts of butterfly range shifts, particularly focusing on regions with limited scientific resources such as the tropics. Scientists surveyed 68 experts from 49 countries, including non-English studies, to create a more complete picture of butterfly migrations. The findings paint a picture of global turmoil, with 80% of the 1,758 species reported to have expanded their ranges, often in tropical areas where they were previously absent.
Conversely, nearly 30% of species have lost ground in areas such as Europe and North America, while 22% have moved to different elevations in response to rising temperatures. Climate change emerged as the primary driver behind butterfly range shifts in 79% of the cases where scientists identified causes, followed by habitat disturbance and agriculture, which were cited most often in instances where butterfly ranges contracted.
The relocation of butterflies carries significant implications for conservation efforts. Identifying and protecting areas that will offer the most suitable conditions for butterflies as temperatures rise is crucial. Reducing harm caused by agricultural practices, preserving interconnected habitats, and forecasting future range shifts are also essential strategies.
Chowdhury emphasized the importance of these findings, noting that butterflies serve as early warning indicators of broader ecological changes. "If their ranges are shifting this dramatically, it signals profound changes across ecosystems," she said.
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