Monarch Joint Venture Blog
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Eastern Monarch Overwintering Population Numbers Announced
Categories
- Population Trends
The monitoring report of the forest area occupied by monarch butterflies in 2017-2018, carried out by WWF and CONANP, registered 2.48 hectares of occupied forests, an area that represents a decrease of 14.77 percent from last year. Read More
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Western Monarch Butterflies Continue to Decline
Categories
- Population Trends
Annual census of monarchs overwintering on the California coast reveals the lowest number of butterflies in recent years. Read More
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Estimating the Number of Overwintering Monarchs in Mexico
Categories
- Population Trends
Every year we anxiously await news of the monarch overwintering population count from Mexico. When are they done and how are the monarchs counted? Read More
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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
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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