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Recent Decline of the Monarch Butterfly Linked to Climate Change

Danaus plexippus) in North America, as well as the possibility of its breeding range becoming inhospitable if global warming shall persist.
(Photo : Photo by Chris Chow on Unsplash)
Monarch butterfly (Danaus plexippus) feeding on sedum flowers
The insect is known for its extraordinary migration from Mexico off north to their breeding grounds in the US, then south in the autumn to shelter against North American winters, and then fly north again in early March. So far, the reason why butterflies leave the relative warmth of Mexico and go back to the US has not been figured out.
From the looks of it, cold weather could be their decisive factor, which implies that monarch behavior could change profoundly over the coming decades if the globe warms persistently. ....

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Scientists look to public for clues to recover monarch butterflies | WSU Insider

February 11, 2021
Photo Cheryl Schultz
Researchers created the “Western Monarch Mystery Challenge” to help inform conservation efforts for the plummeting western monarch population.
SANTA CRUZ, Calif. Migratory western monarch has declined by more than 99% since the 1980’s. The Xerces Society, an international invertebrate conservation nonprofit, reported that the total number counted in 2020 was down to 1,914, a drop by more than 90% from the prior year a count already below the threshold at which scientists warned the migration may collapse.
To help scientists gain insight into migratory monarchs this spring, researchers are inviting the community to participate in the Western Monarch Mystery Challenge. The challenge was started by a group of researchers from Washington State University, Tufts University, University of California at Santa Cruz and the Xerces Society to help fill a critical gap in knowledge about habitat needs of migrating monarchs in the ....

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U.S. agency sidesteps listing monarch butterflies as endangered

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Illegal logging at wintering grounds in Mexico contributes to the monarch butterfly’s decline.
FRANS LANTING/MINT IMAGES/SCIENCE SOURCE
U.S. agency sidesteps listing monarch butterflies as endangered
Dec. 15, 2020 , 6:20 PM
The U.S. Fish and Wildlife Service (FWS) announced today it will not yet protect one of North America’s best known butterflies under the Endangered Species Act. The agency concluded that the iconic black and orange monarch (
Danaus plexippus) has suffered population declines steep enough to possibly qualify for federal protection, but FWS will take no action at this time because 161 species already being considered for the list are a higher priority for support from the agency’s limited budget. ....

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