Mexican Overwintering Monarchs Graph

eastern_pop_graph_2015

This graph shows the area of forest occupied by colonies of hibernating monarchs in Mexico from 1994-2015 (Graph courtesy of the Monarch Joint Venture). In late January 2015, the World Wildlife Fund in Mexico reported that the size of the 2014–2015 overwintering population is the second smallest since monitoring began in 1994, occupying an estimated area of just 1.13 hectares (2.79 acres) (Secretariat of Environment and Natural Resources, Mexico 2015). Over the last 21 years, the average forested area occupied by monarchs at the Mexican overwintering sites has been 6.00 hectares (14.82 acres). Researchers estimate that between 10–50 million monarchs exist per hectare. Thus, the size of this year’s population represents only 19% of the 20-year average.

Donate

to protect invertebrates!

Newsletter

Sign up for our newsletter to recieve up to date information about our programs and events.

Search this Site
Facebook
Like us on Facebook

Twitter
Follow us on Twitter
Program Features
Program Highlights
  • • The Xerces Society has awarded two $3,750 Joan M. DeWind awards for research into lepidoptera conservation
  • Butterfly-a-thon pledges raise $30 per species that Bob Pyle observes for butterfly conservation work
Additional Information

 

The Xerces Society • 628 NE Broadway Ste 200, Portland OR 97232 USA • tel 855.232.6639 • fax 503.233.6794 • info@xerces.org
site mapcontactgivecontact the webmaster