University of Minnesota

Eastern Monarch Population Status Update

Posted on Thursday, March 29, 2018 at 2:01 pm in Uncategorized

Earlier this month, World Wildlife Fund Mexico released the numbers for the eastern monarch overwintering population in an announcement which can be found here

The following text is translated from the original news announcement: 

The monitoring report of the forest area occupied by Monarch butterflies in 2017-2018, carried out by WWF and Conanp, registered 9 colonies of butterflies that occupied 2.48 hectares of forests, an area that represents a decrease of 14.77 percent with respect to the previous season (2.91 ha). 

"Although there are many factors involved, this decrease of the occupied surface is attributed to the presence of two tropical storms and three hurricanes on two occasions in the Atlantic coasts in mid-September of 2017, when the migration begins. This impacted the number of Monarcas that arrived in Mexico," said Jorge Rickards, Director General of the World Wide Fund for Nature (WWF) Mexico. "The high temperatures in the Midwest and Northeast of the United States also resulted in late migration and as a result low occupancy areas in Mexico, as suggested by US researchers," he added.

  • © 2018 Regents of the University of Minnesota. All rights reserved.
  • The University of Minnesota is an equal opportunity educator and employer. Privacy