
© Marjorie Miller, Associated PressA scientist collects a monarch butterfly near Zitacuaro, Mexico
The amount of land occupied by the migrating creatures shrank 59% from a year ago, scientists say. The decline could hurt tourism and the ecosystem.Scientists who take the annual measure of Mexican forestland famously occupied by migrating monarch butterflies said Wednesday that the butterfly population is the smallest they have seen in two decades.
The likely cause is unseasonably warm weather recently in the United States, as well as a dramatic loss of habitat in the U.S. Corn Belt, the scientists said.
In a survey carried out in December and January, researchers found nine monarch colonies wintering in central Mexico, occupying a total of 1.19 hectares, or 2.94 acres, a 59% decrease compared with the previous year's study.
It was troubling news for the Mexican states of Michoacan and Mexico, where the yearly arrival of the butterflies is a major tourist attraction. Of even greater concern, experts say, is the potential impact that a diminished butterfly population could have on interconnected habitats and species across North America.
The results were released by the World Wildlife Fund, the Mexican government and giant Mexican cellphone company Telcel, which has supported butterfly habitat conservation.
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