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- W4299969197 abstract "1. The size of the Mexican overwintering population of monarch butterflieshas decreased over the last decade. Approximately half of these butterflies comefrom the U.S. Midwest where larvae feed on common milkweed. There has been alarge decline in milkweed in agricultural fields in the Midwest over the last decade.This loss is coincident with the increased use of glyphosate herbicide in conjunctionwith increased planting of genetically modified (GM) glyphosate-tolerant corn(maize) and soybeans (soya).2. We investigate whether the decline in the size of the overwintering populationcan be attributed to a decline in monarch production owing to a loss of milkweeds inagricultural fields in the Midwest. We estimate Midwest annual monarch productionusing data on the number of monarch eggs per milkweed plant for milkweeds in differenthabitats, the density of milkweeds in different habitats, and the area occupiedby those habitats on the landscape.3. We estimate that there has been a 58% decline in milkweeds on the Midwestlandscape and an 81% decline in monarch production in the Midwest from 1999 to2010. Monarch production in the Midwest each year was positively correlated withthe size of the subsequent overwintering population in Mexico. Taken together, theseresults strongly suggest that a loss of agricultural milkweeds is a major contributorto the decline in the monarch population.4. The smaller monarch population size that has become the norm will make thespecies more vulnerable to other conservation threats." @default.
- W4299969197 created "2022-10-03" @default.
- W4299969197 creator A5056167434 @default.
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- W4299969197 date "2017-09-19" @default.
- W4299969197 modified "2023-09-25" @default.
- W4299969197 title "Milkweed loss in agricultural fields because of herbicide use: effect on the monarch butterfly population: Herbicide use and monarch butterflies" @default.
- W4299969197 doi "https://doi.org/10.31219/osf.io/wmj6e" @default.
- W4299969197 hasPublicationYear "2017" @default.
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