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Cooperative Extension San Joaquin County
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Cooperative Extension San Joaquin County

Posts Tagged: Xerces Society

How Many Overwintering Monarchs in California?

Monarch butterfly feeding on milkweed. (Photo by Kathy Keatley Garvey)

There's good news and not-so-good news about the Western Monarch Thanksgiving Count in California. Last December the Xerces Society for Invertebrate Conservation released preliminary figures. Now they've announced the final tally: almost 272,000...

Posted on Thursday, February 11, 2016 at 5:52 PM

Status of Overwintering Monarchs in California

Monarch butterfly roosting in Berkeley Aquatic Park in November. They are at the 14th disc golf course in an ash tree. (Photo by Kathy Keatley Garvey)

Is the overwintering monarch butterfly population along California's coast increasing or decreasing? "So far,  far the picture is rather mixed for the number of monarchs in California," according to Matthew Shepherd, communications director...

Posted on Monday, December 14, 2015 at 7:06 PM

A Wake-Up Call to Conserve California's Monarchs

A monarch butterfly nectaring on a butterfly bush in Vacaville, Calif. today (Oct. 10). (Photo by Kathy Keatley Garvey)

It's been called a "wake-up call." And that it is. It's designed to alert people to a problem that needs fixing. And that's good news for the monarch butterflies. California Gov. Jerry Brown has just signed Assembly Bill 559, which gives authority to...

Posted on Tuesday, October 13, 2015 at 5:19 PM

Go West, Young Monarch, Go West!

A male Monarch nectaring on Mexican sunflower (Tithonia). (Photo by Kathy Keatley Garvey)

Westward, ho! The western migration of the Monarch butterflies (Danaus plexippus)  to their overwintering sites along the California coast is underway. Butterfly expert Art Shapiro, distinguished professor of evolution and ecology at the...

Posted on Tuesday, October 14, 2014 at 5:37 PM

Saving the Monarchs

Monarch butterfly nectaring on Mexican sunflower, Tithonia, as a territorial male longhorned bee, Melissodes agilis, takes aim. (Photo by Kathy Keatley Garvey)

The Xerces Society for Invertebrate Conservation issued news today that is both disturbing and hopeful. Disturbing in that the monarch butterfly population (Danaus plexippus) has declined by more than 90 percent in under 20 years. Hopeful in that the...

Posted on Tuesday, August 26, 2014 at 5:48 PM

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