The population of western monarch butterflies wintering along the California coast has rebounded for a second year in a row after a precipitous drop in 2020, but the population is still well below what it used to be, researchers say.
“Some of that kind of leakage could be occurring and I don’t think we fully understand the system enough to say what it is,” she said. “But I think one thing it’s not is that all is well or that we all made human actions that magically made it all better.”Scientists say the butterflies are at critically low levels in western states because of destruction to their milkweed habitat along their migratory route as housing expands into their territory and use of pesticides and herbicides increases.
Western monarch butterflies head south from the Pacific Northwest to California each winter, returning to the same places and even the same trees, where they cluster to keep warm. The monarchs breed multiple generations along the way for thousands of miles before reaching California where they generally arrive at the beginning of November. Once warmer weather arrives in March, they spread east of California.
This year the insects’ wintering habitat along California’s central coast was also battered by heavy rains and volunteers reported more monarchs blown from their clusters and vulnerable to the cold, wet conditions and predation, the Xerces Society said in a statement.
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