In December 2020, after an extensive status assessment of the monarch butterfly, we determined that listing the monarch under the Endangered Species Act is warranted but precluded at this time by higher priority listing actions. Pesticide Supplemental Materials for the Monarch Species Status Assessment Report ![]() Monarch Butterfly Species Status Assessment Report Read about the population model that helps us predict population levels for both the eastern and western North American monarch populations. The assessment also projects future status of the species based on analysis of this information. The Monarch Species Status Assessment identifies the monarch’s needs (at an individual, population and species level), and assembles information on the current status, threats or stressors, along with conservation efforts that may influence threats. Status of the monarch butterfly under the Endangered Species Act Though there have been previous periods of climatic change, since the mid-20th century humans have had an unprecedented impact on Earth's climate system and caused change on a global scale. ![]() The primary drivers affecting the health of the two North American migratory populations are changes in breeding, migratory, and overwintering habitat (due to conversion of grasslands to agriculture, urban development, widespread use of herbicides, logging/thinning at overwintering sites in Mexico, unsuitable management of overwintering groves in California, and drought), continued exposure to insecticides, and effects of climate change climate changeĬlimate change includes both global warming driven by human-induced emissions of greenhouse gases and the resulting large-scale shifts in weather patterns. What does this trend mean for the future of the monarch? Is it a genuine decline in the monarch population? If so, is it part of a larger natural cycle, a temporary circumstance, or a result of human impact? Is the monarch at risk of extinction, or might it be in the future? What threats does the monarch face? Image Details Why are we concerned about monarchs?įor more than 20 years, communities and scientists have been tracking monarch populations, with growing concern as the number of monarchs at overwintering sites has declined.
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