250 butterfly species studied (IMAGE)

University of Nevada, Reno

250 butterfly species studied

Caption

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. The total time span encompassed by the study is 42 years, from 1977 to 2018, and the average length of time series from individual sites was 21 years.

Credit

Chris Halsch, University of Nevada, Reno

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