Fewer monarch butterflies are reaching their overwintering destination

phys.org | 1/2/2019 | Staff
katz1234 (Posted by) Level 3
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Arguably, one of the world's most famous insects, the monarch butterfly, is currently experiencing dire problems with its migration in eastern North America. Fewer and fewer monarchs are successfully reaching their overwintering destinations, and scientists aren't sure why. Because of this, the need for research on the migration has never been more urgent. New research published in De Gruyter's Open Access journal Animal Migration, aims to help with this effort.

The dwindling numbers of overwintering monarchs in the mountains of central Mexico have been the subject of debate among researchers, with some arguing it reflects a large-scale drop in numbers of breeding adults, while others point to increasingly perilous migration as the cause. Now, a new research study "Alternate migration strategies of eastern monarch butterflies revealed by stable isotopes" led by Dr. Hannah Vander Zanden, from the University of Florida, throws another potential explanation into the mix—maybe the monarchs are simply travelling elsewhere to overwinter, like to the balmy coast of southern Florida.

Dr - Vander - Zanden - Team - Monarchs

Dr. Vander Zanden and her team captured and examined monarchs that wintered in South Florida, using a special analytical technique that can pinpoint where the monarchs came from based on a sample of their wing or body tissue. Amazingly, they discovered that half of the monarchs sampled appeared to originate from the American Midwest, which is typically thought to represent the core breeding...
(Excerpt) Read more at: phys.org
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