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Western monarch populations have rebounded since their calamitous drop in 2020 but are still far below historic norms. ... tree branch at the Coastal Access Monarch Butterfly Preserve in Los Osos ...
The western monarch butterfly population wintering along California's coast remains critically low for the second year in a row, a count by an environmental group released Thursday showed. The ...
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 number of western monarch butterflies overwintering in California dropped by 30% last year, likely due to how wet it was, researchers said Tuesday. Volunteers who visited sites in California ...
Western monarch populations from 1997 to 2013 (from Xerces Society data) Based on a 2014 20-year comparison, the overwintering numbers west of the Rocky Mountains have dropped more than 50% since 1997 and the overwintering numbers east of the Rockies have declined by more than 90% since 1995.
Western monarch populations 1997–2013 from Xerces data. Initially, direct observation was the primary method used to assess monarch migration. [64] More sophisticated methods have been developed since 1975. Tags for wings of monarch butterflies to study migration.
Monarch populations in the West face an even greater chance of extinction at 99% by the year 2080. The Fish and Wildlife Service is accepting public comments on its proposal until March 12, 2025.
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