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Climate Conditions, Herbicide Use Resulted in Sharp Drop in Number of Monarch Butterflies Wintering in Mexico this Past Season

ISSN:1054-8890
LADB Article ID: 78536
Category/Department: Mexico
Date: 2012-03-21
By: Carlos Navarro

Climate conditions in the US and Mexico and the prevalent use of herbicides in the US and Canada contributed to a 28% decline in the population of monarch butterflies wintering in Mexico during the 2011-2012 season. A study commissioned by The World Wildlife Fund (WWF), the Comisión de Áreas Naturales Protegidas (CONANP), and private donors said monarch butterflies were found in only 2.89 hectares of forest this winter, compared with about 4 ha last winter and 4.7 ha in 2009-2010.

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