AFTER RECORD LOW, MONARCH NUMBERS BOUNCE BACK IN CALIFORNIA
There is a ray of hope for the vanishing orange-and-black Western monarch butterf lies.
The number wintering along California’s central coast is bouncing back after the population, whose presence is often a good indicator of ecosystem health, reached an all-time low last year. Experts pin their decline on climate change, habitat destruction and lack of food due to drought.
An annual winter count last year by the Xerces Society recorded fewer than 2,000 butterflies, a massive decline from the tens of thousands tallied in recent years and the millions that clustered in trees from Northern California’s Mendocino County to Baja California,
Mexico, in the south in the 1980s. Now, their roosting sites are concentrated mostly on California’s central coast.
This year’s official count that began Nov. 14 showed more than 50,000 monarchs at overwintering sites in its first week, said Sarina Jepsen, Director of Endangered Species at Xerces Society for Invertebrate Conservation.
“This is certainly not a recovery but we’re really optimistic and just really glad that there are monarchs here and that gives us a bit of time to work toward recovery of the Western monarch migration,” Jepsen said.
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 generally arrive in California at the beginning of November and spread across the country once warmer weather arrives in March.
Monarchs from across the West migrate annually to about 100 wintering sites dotting Central California’s Pacific coast. One of the bestknown wintering places is the Monarch Grove Sanctuary, a cityowned site in the coastal city of Pacific Grove, where last year no monarch butterf lies showed up.
The city 70 miles south of San Francisco has worked for years to help the declining population of monarch. Known as “Butterfly Town, USA,” the city celebrates the butterfly with a parade every October. Messing with a monarch is a crime that carries a $1,000 fine.
“I don’t recall having such a bad year before and I thought they were done. They were gone. They’re not going to ever come back and sure enough, this year, boom, they landed,” said Moe Ammar, president of Pacific Grove Chamber of
Commerce.
This year a preliminary count showed more than 13,000 monarchs had arrived at the site in Monterey County by mid-November, clustering together on pine, cypress and eucalyptus trees and sparking hope among the grove’s volunteers and visitors that the struggling insects can bounce back.
Scientists don’t know why the population increased this year but Jepsen said it is likely a combination of factors, including better conditions on their breeding grounds.
“Climatic factors could have influenced the population. We could have gotten an influx of monarchs from the eastern U.S., which occasionally can happen, but it’s not known for sure why the population is what it is this year,” she said.