The head of the National Commission for Natural Protected Areas, Luis Fueyo, explained that the reduction in the number of specimens of the species is due to climate change, as well as the scarcity of their food during their migratory journey.
"In order to reproduce, these butterflies with a black outline and orange and amber tones leave eggs during their journey and it is critical that milkweed is available (for feeding and spawning), which has been decreasing significantly due to pesticides in soybean crops and corn from Canada and the United States, "he said.
Given this situation, he added, they will seek to conserve the areas that use these insects as food sources.
According to Fueyo, Guanajuato, San Luis Potosí, Coahuila and Zacatecas are the states that were identified as priority feeding sites on the butterfly route.
During the presentation, a graph was exhibited that shows that the reproduction spaces in the Mexican refuges fell from 18.19 hectares in 1996-1997 to 0.67 hectares in the 2013-2014 period.
Every year during the first days of November millions of monarch butterflies arrive to hibernate in the forests of the state of Michoacán, southwestern Mexico, after traveling 5,000 kilometers from Canada and the United States, a phenomenon that the environmental authorities of the three countries are now seeking. preserve.
According to Fueyo, although it is not yet the arrival season for this species, specimens have begun to be detected in the border state of Coahuila, which "may be the prelude to a larger migration."