Monarch butterflies love milkweed. Preserving it will be key to saving butterfly populations.
Populations of the insect, which once swarmed across the United States on their annual migrations from Mexico to Canada, have fallen off a cliff over the last century. California’s butterflies are on the brink of extinction, while eastern monarchs, which fly up the Great Plains or over to Maine, have declined 80 percent.
“Maybe because of climate change, the monarch arrived earlier than the blooming of that plant,” he says. “Monarchs are picky. You can have a whole bunch of beautiful milkweed here, but they will get that ugly stem on the other side of the field.” But the same findings have a note of good news: Conservation efforts, which are focused on the American Midwest, are targeted where they need to go. The impetus for the research, Solis-Sola says, was actually to see if that regional focus actually made sense.That’s because monarchs undertake their migration over the course of generations: The insects that land in Canada are the descendants of those that took off in Mexico.
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