Concerted conservation actions needed to save species
Monarch butterflies in the western U.S. have declined even more dramatically than believed, putting the population at risk of extinction, according to new research. In As recently as the 1980s, about 10 million monarchs over-wintered in coastal California, but today that’s down to about 300,000, said Cheryl Schultz, an associate professor at Washington State University Vancouver, who led the study, published last week in the journal Biological Conservation. Continue reading “Western monarchs in steep decline”→
The decline of milkweed may not be the main factor driving monarch butterflies toward oblivion, according to a new study by Cornell University scientists. Weather, habitat fragmentation and dwindling sources of nectar in the autumn are also critical, the new study reports.
“Thanks to years of data collected by the World Wildlife Fund and citizen-scientists across North America, we have pieced together the monarch life cycle to make inferences about what is impacting the butterflies,” said Cornell University Prof. Anurag Agrawal.
Steep regional population declines are leading the species toward the brink
While there has been some recent good news about short-term prospects for monarch butterflies, a new study led by scientists with theU.S. Geological Survey and the Scripps Institution of Oceanography at UC San Diego warns that the eastern population of the species could become extinct within a few decades.
This year’s count estimated that 56.5 million monarchs are currently gathered in Mexico for the winter, up from last year’s lowest ever total of 34 million. But that’s still more than 80 percent below the 20-year average and down 95 percent from numbers tallied in the mid-1990s. Near-perfect conditions during breeding season helped bolster the numbers this year. Continue reading “Biodiversity: Monarchs bounce back, still need help”→