Oklahoma milkweed supply decreases, affecting monarch butterfly migration
As recently as 2008, Oklahomans were able to witness hundreds or even thousands of monarch butterflies on their journey south for the winter. However, last year festivalgoers at Monarch in the Park in Blanchard, Oklahoma, only saw a few butterflies. One local factor contributing to the population decrease of monarchs is the killing of milkweed plants in the Midwest, particularly with herbicides and roadside mowing. Global factors include deforestation and urban development, as well as biofuel development. These factors are “indicators that we are poisoning our environment,” said Robert Robbins, a Smithsonian curator of Lepidoptera — or the order of…