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The Western Monarch Count has reported a peak population of just 9,119 butterflies this winter, down from approximately 200,000 overwintering butterflies counted each year over the past three ...
A 2014 study acknowledged that while "the protection of overwintering habitat has no doubt gone a long way towards conserving monarchs that breed throughout eastern North America", their research indicates that habitat loss on breeding grounds in the United States is the main cause of recent and projected population declines. [183] Western ...
Pelton said that it's too early to tell what long-term impact the dramatic losses might have on the overall western monarch population. Insects do have the potential for exponential growth, Pelton said. After bottoming out at 1,901 butterflies in 2020, the population rebounded to 247,246 insects the following year, an increase of nearly 13,000%.
California's monarch population has declined sharply from 4.5 million in the 1980s. The population initially dropped to nearly 200,000 and had an even greater decrease during 2018. That year, the population fell to nearly 30,000. By November 2020, the population had dropped to fewer than 2,000, representing a 99% collapse in three decades. [46]
The Western population of the monarch butterfly hit a near-record low with fewer than 10,000 found living in California this ... An all-time low of fewer than 2,000 monarchs was recorded in 2020.
Butterfly counts are sometimes done where there is a concentration (a roost) of a species of butterflies in an area. One example of this is the winter count of western monarch butterflies as they roost together at sites in California, northern Mexico and Arizona. [4]
Monarch Butterflies: Increase the Eastern population of the monarch butterfly to 225 million butterflies occupying an area of approximately 15 acres (6 hectares) in the overwintering grounds in Mexico, through domestic/international actions and public-private partnerships, by 2020.
A monarch butterfly feeding on milkweed. (Shutterstock) The U.S. Fish and Wildlife Service is pushing for added protections for the monarch butterfly after seeing a population decline of about 80%.