- Author: Kathy Keatley Garvey
Postema studies the role of animal coloration in predator-prey interatctions with a special focus on color-changing species. She works with both live and artificial swallowtail caterpillars (family Papilionidae) in the field.
She is the lead author of a review article, "Color Under Pressure: How multiple Factors Shape Defensive Coloration," published in June 2022 in the journal, Behavioral Ecology.
The abstract: Behavioral ecologists have long studied the role of coloration as a defense against natural enemies. Recent reviews of defensive coloration have emphasized that these visual signals are rarely selected by single predatory receivers. Complex interactions between signaler, receiver, and environmental pressures produce a striking array of color strategies—many of which must serve multiple, sometimes conflicting, functions. In this review, we describe six common conflicts in selection pressures that produce multifunctional color patterns, and three key strategies of multifunctionality. Six general scenarios that produce conflicting selection pressures on defensive coloration are: (1) multiple antagonists, (2) conspecific communication, (3) hunting while being hunted, (4) variation in transmission environment, (5) ontogenetic changes, and (6) abiotic/physiological factors. Organisms resolve these apparent conflicts via (1) intermediate, (2) simultaneous, and/or (3) plastic color strategies. These strategies apply across the full spectrum of color defenses, from aposematism to crypsis, and reflect how complexity in sets of selection pressures can produce and maintain the diversity of animal color patterns we see in nature. Finally, we discuss how best to approach studies of multifunctionality in animal color, with specific examples of unresolved questions in the field."
On the Yang lab website, Postema says: "After growing up in Ann Arbor, MI, I relocated to Denison University in Granville, OH to pursue my undergraduate degree. Though I began my college career as a studio art major, I quickly found that biology was my calling. I studied a wide range of systems throughout college, from lemon sharks and rock iguanas to deciduous shrubs. I am now conducting research on insect color and behavior in the Animal Behavior program at UC Davis. When I'm not obsessing over bugs, I can usually be found spoiling my pet chickens, drawing sketches for The Ethogram, or writing poetry."
At UC Davis, Postema is a member of the Animal Behavior Graduate Group.
"Elizabeth will be starting a great postdoc position studying beetle coloration at the Field Museum in Chicago," Professor Yang announced.

- Author: Kathy Keatley Garvey
As you shelter in and look for something intriguing to do, would you to learn more about entomology, the science of insects?
The Bohart Museum of Entomology at UC Davis, home of nearly eight million insect specimens, offers a wealth of information on insects in its free fact sheets that you're welcome to peruse and download. Topics include beetles, wasps/bees, mites/ticks, ants, flies, butterflies/moths, true bugs, and non-insects (think spiders, lawn shrimps, scorpions, springtails.) The fact sheets are the work of Bohart director Lynn Kimsey, professor of entomology, UC Davis Department of Entomology and Nematology.
If you want a bug identified, you can also shoot Professor Kimsey an email at lskimsey@ucdavis.edu.
As for how to create an insect collection, the Department of Entomology and Nematology provides a great resource. Back in 2010, distinguished professor James R. Carey led a group of students in producing short, clear, concise videos on just that: how to create an insect collection. (Many high school and college teachers assign their students to collect insects, as do some youth programs that engage in entomology.)
The entire series, totaling 11 clips ranging in length from 32 seconds to 77 seconds, can be viewed in just less than 10 minutes. "So in less than 10 minutes, someone can learn how to make an insect collection,” Carey says. The clips are tightly scripted, with an emphasis on brevity, simplicity and low cost.
The project won an award from the Entomological Society of America (ESA). Carey went on to win the ESA's 2015 Distinguished Teaching Award; the "How to Make an Insect Collection" project was just one of the many factors considered.
So, how do you make an insect collection? Easy!
Here are the videos:
Part 1:
Hand Collecting (32 seconds)
Part 2:
Using an Aspirator (34 seconds)
Part 3:
Ground Collecting (54 seconds)
Part 4:
Aquatic Collecting (58 seconds)
Part 5:
Using Nets (58 seconds)
Part 6:
Killing (51 seconds)
Part 7:
Pinning (43 seconds)
Part 8:
Point Mounting (50 seconds)
Part 9:
Labeling Specimens (48 seconds)
Part 10:
Spreading (77 seconds)
Part 11:
Storage and Display (32 seconds)


- Author: Kathy Keatley Garvey
Standing on her front porch last Wednesday morning, overlooking the Dutchman's pipevine that her mother Della planted in the 1920s, Louise Hallberg is a picture of enthusiasm, dedication and sincerity--or what her docents call her “indomitable spirit.”
Her butterfly sanctuary, a non-profit corporation since 1997, has drawn more than 30,000 visitors, including scores of wide-eyed children and their teachers and parents butterfly enthusiasts, gardeners, and nature lovers. “Over 1000 visitors came on our Open Gardens Day on June 28,” she says. Many visitors come from out of the county, the state, and the country, she said.
Her expression turns to concern. I"'m terribly concerned about the drought. We've very low on rainfall. It was 105 on Sunday. It's been so hot, so long.” She is deeply concerned about the decline of butterflies. “I've tracked the butterflies here since 1992,” she relates. “We're not getting the numbers we used to.”
Louise Hallberg, who will be 99 next January, was born on the family farm. Her grandparents, John and Louise Neta Pearson, initially purchased 40 acres and expanded it to 130 acres, growing hops, berries, cherries, prunes, pears and apples. The oldest of their three children, Alfred, later took over the farm, and he and Della--the one who planted that Dutchman's pipe---raised two daughters, Louise and Esther.
“I remember when my mother found the Dutchman's pipevine growing along a country road and brought it here and planted it,” Louise recalls. “Look at it now."
Louise studied at Santa Rosa Junior College and UC Berkeley, majoring in political science. Then she worked 35 years as Santa Rosa Junior College registrar, retiring in 1975.
But it was the pipevine swallowtails that continued to spark her interest and what led to the formation of the butterfly sanctuary. She monitors the populations of many species of butterflies, keeping careful records. The numbers keep dwindling but not her passion.
On our visit, we enjoyed the ponds, the vivarium, the “secret garden,” butterfly creek, pipevine theater, the woodpecker granary, the meadow garden, and the weather station that her family has monitored and maintained for more than three decades. .We glimpsed the Gravenstein apple orchard and ladders leaning up against the trees, a scene from yesteryear that never changes.
"We add new plants (funded by donations) every year," Hallberg says. The Hallberg Butterfly Gardens, in western Sonoma County, are open by appointment for docent-guided tours from April 1 to Oct. 31. Appointments are offered Wednesday through Sunday, between 10 a.m. and 4 p.m. (Contact the tour and volunteer coordinator (707) 591-6967 or email her at leah@hallbergbutterflygardens.org to arrange a visit.) The non-profit corporation offers books, posters, t-shirts and other gifts. It annually hosts an Open Gardens Day in June that includes a plant sale. Louise Hallberg continues to publish her newsletter, aptly named "The Pipevine."
Meanwhile, during our visit, the red-spotted pipevine swallowtail caterpillars went about munching the leaves of the Dutchman's pipevine, while butterflies laid their eggs on their host plants: the monarchs on the milkweed and the anise swallowtails on fennel.
We thought back to the conversation on the front porch with this remarkable 98-year-old "Butterfly Lady of Sebastopol" and her love of the swallowtails, monarchs and dozens of other species of butterflies--and the worries she harbors, not for herself, but for the butterflies.
"It's been so hot, so long."




