Monarch Joint Venture Blog

Measuring Monarchs and Milkweed
Categories
- Population Trends
- Recent Research
Monarch population size estimates allow us to assess the status of the population, and set goals for restoring it to a sustainable level. Monarchs’ declining numbers have gained a lot of attention, but how is the monarch population measured anyway? Read More

Eastern Monarch Population Numbers Drop 27%
Categories
- Population Trends
This year’s measurement of the eastern monarch overwintering population showed a 27% decrease compared to last year, occupying 2.91 hectares of forest in Mexico’s transvolcanic mountains during the winter of 2016-17. Read More

Western Monarch Count Reports More Monarchs than 2015, but Numbers Remain Low
Categories
- Population Trends
The 2016 Western Monarch Thanksgiving Count population survey has reported 298,464 western overwintering monarchs from 253 monitored overwintering sites across the California coast. Read More

New Publication Reveals Birthplaces of Eastern Monarchs
Categories
- Population Trends
- Recent Research
A recently published study (Flockhart et al. 2017) builds on previous work describing the natal origin of eastern overwintering monarchs, and has new implications for monarch conservation. Read More

Road Tripping for Monarchs in Utah and New Mexico
Categories
- Community Science
- MJV Partnership News
- Population Trends
There are blank pages in the monarch butterfly book in the western United States. This summer the Southwest Monarch Study, with support from the Monarch Joint Venture, has been working to fill them. Read More