- Author: Kathy Keatley Garvey
The yellow-faced bumble bee bursts from a neon pink blossom in the video below.
It's Oct. 19, 2022 and the temperature has soared to an unseasonal 81 degrees. This bumble bee is hungry. She may have emerged from hibernation "to get a bite to eat," as the late Robbin Thorp, UC Davis distinguished emeritus professor of entomology, used to say about late-in-the-season sightings.
B. vosenenskii, native to the west coast of North America, from Baja California to British Columbia, is an important pollinator, especially important for its buzz pollination of tomatoes, peppers and cranberries. In buzz pollination, the bumble bees grab a blossom and shake it, dislodging the pollen to accomplish pollination.
The ice plant, Carpobrotus edulis, is a native of South Africa and known as an invasive weed.
Interesting that on one end of the Doran Regional Park, volunteers with the California Native Plant Society are pulling out the ice plant to make room for native plants, while on the other end, a bumble bee hungrily sips the nectar. "Ice plant chokes out native plants and alters the local soil composition," according to the park website. "Removing ice plant allows native, endangered plants to repopulate the area and wildlife to thrive."
Want to learn more about the bumble bees around us? Read these two books, both co-authored by Thorp in his retirement: Bumble Bees of North America: An Identification Guide (Princeton University, 2014) and California Bees and Blooms: A Guide for Gardeners and Naturalists (Heyday, 2014).
And, if you see a bumble bee and would like to get involved in citizen science, Bumble Bee Watch seeks your sightings.
- Author: Kathy Keatley Garvey
The latest edition of Fremontia, a publication of the California Native Plant Society (CNPS), is devoted to the state's declining prairies and grasslands.
"Humans are largely responsible" for this decline, writes editor Bob Hass. "We exploit natural resources for basic human needs and for consumable. But too few of us pay attention to the effect our actions have on the environment. Fewer still make the connection between an eroding environment (polluted water, air, soil from toxic chemicals) and cumulative impacts to human health (cancer, birth and immune system defects) or to plants and animals (disease, acid rain, increased toxins accumulating in the food chain)."
So true. And as Hass says "Nature cannot protect itself from what we humans do to the environment, but we can."
We were especially interested in the article, "Native Bees and Flowers in California Prairies and Grasslands" by native pollinator specialist Robbin Thorp, emeritus professor of entomology at UC Davis and a 35-year member of CNPS.
He quoted John Muir in his book, The Mountains of California: "When California was wild, it was one sweet bee-garden throughout its entire length...the Great Central Plain of California, during the months of March, April, and May, was one smooth, continuous bed of honey-bloom, so marvelously rich that in waking from one end of it to the other, a distance of more than 400 miles, your foot would press about a hundred flowers at every step."
Not so today! No wonder the bees are suffering from malnutrition (not to mention other issues).
Thorp calls attention to some of the flowers found today in the Central Valley grasslands. "Our state flower, the California poppy (Eschscholzia californica) produces no nectar, but only pollen as a reward to bees...Generalist bumble bees (Bombus spp.) and sweat bees (Halictus spp.) are the main visitors, along with small pollen feeding beetles."
Thorp illustrated his article with a beautiful photo by Davis plant/insect enthusiast and photographer Gary Zamzow of the yellow-faced bumble bee (Bombus vosnesenskii) foraging for pollen on a California poppy. Thorp also included several other photos.
No doubt you've seen honey bees foraging on California poppies, but as Thorp says, poppies provide no nectar, only pollen.