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What s Behind The Decline In Butterfly Populations?
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1 western butterfly population has dropped 99 9% since the 1980s
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Brink of extinction for western monarch and other butterflies. Climate change plays a role
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A monarch butterfly feeds on a narrow leaf milkweed.Xerces Society for Invertebrate Conservation
The numbers are grim. This year when the western monarch butterfly made its annual wintertime stop in Pacific Grove and other parts of California, the number of fluttering black-and-orange insects added up to only about 7% of last year’s population, which already was a fraction of its usual amount.
Probably the most beloved and recognized butterfly in the United States, the western monarch is essentially on the brink of extinction, said Katy Prudic, co-author of a new report from the University of Arizona that found that the monarchs, along with about 450 butterfly species in the Western United States, have decreased overall in population by 1.6% per year in the past four decades. The main culprit seems to be rising temperatures in the fall.
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Slowly warming autumn months have driven population declines in butterflies throughout the American West for the last 40 years, according to a new study, which leveraged data collected by both expert and citizen scientists. The findings shed new light on the insidious impacts of climate change on butterfly populations and suggest the need for new approaches to butterfly conservation. Society should not assume that legal protection of open spaces is sufficient without the action to limit the advance of anthropogenic climate change, write the authors. Although alarming and widespread reductions in insect abundance and diversity have been observed over the last several decades, the recent and rapid declines in pollinator species are particularly concerning. Tiny pollinators like bumblebees and butterflies are vital to the long-term survival of wild and agricultural plant communities. They are, in many ways, critical to the integrity of biodiversity, global food webs and huma
The decades-long decline in butterfly populations across U.S. western states has researchers calling for improvement and expansion of habitat conservation methods.
Butterfly decline was estimated using data from 72 locations with at least 10 years of data per location and more than 250 butterfly species, including this Adelpha bredowii, or California Sister. (Credit: Chris Halsch, University of Nevada, Reno)
(CN) The American West is in the grips of a consistent 40-year decline in butterfly populations, a trend researchers on Thursday said can be culled using expanded conservation as climate change makes the region increasingly drier and warmer.
Butterfly populations across the western United States have declined 1.6% annually over the last four decades, according to the study published Thursday in the journal Science.
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