Based on population counts in their wintering grounds, monarch butterflies were thought to be in decline, but a 25-year assessment of summer populations in North America shows they are doing surprisingly well
are seeing dramatic losses in overwintering sites in North America, the summer population has been stable for the past 25 years.
Around September, the striking orange and black insects leave their breeding grounds in the US and Canada and head roughly 4000 kilometres south, where they blanket mountaintop pine and fir forests in central Mexico and southern California. A survey of their wintering grounds last year found that the eastern population of monarchs, which travels from north-eastern US to Mexico, have suffered losses of around 70 per cent since the mid-1990s.
that usually happens in July, volunteers at 403 different sites across North America tally the butterflies they see within a circle 24 kilometres across.The team’s analysis revealed that monarch butterfly numbers are remarkably stable. Across North America, the number of monarchs increased by an average of 1.36 per cent every summer.
The study authors suspect the butterflies’ offspring are making up for winter losses. A female can lay hundreds of eggs each spring, which enables a dramatic population boom within a single season.
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Monarch butterfly populations are thriving in North AmericaFor years, scientists have warned that monarch butterflies are dying off in droves because of diminishing winter colonies. But new research from the University of Georgia shows that the summer population of monarchs has remained relatively stable over the past 25 years.
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