- Author: Kathy Keatley Garvey
Assistant professor Laura "Melissa" Guzman of the University of Southern California (USC) will discuss "Using Occupancy Models to Infer Trends of Bee Biodiversity in North America" at the April 29th seminar hosted by the UC Davis Department of Entomology and Nematology.
Her seminar begins at 4:10 p.m. in 122 Briggs Hall and also will be on Zoom. The Zoom link:
https://ucdavis.zoom.us/j/9 5882849672
"Historical museum records provide potentially useful data for identifying drivers of temporal trends in species occupancy, however, because these records were not explicitly collected for this purpose, methodological developments are needed in order to enable robust inferences," Guzman writes in her abstract. "Occupancy-detection models, a relatively new and powerful suite of methods, are potentially useful here, because these models allow us to account for changes in collection effort through space and time. Applying such occupancy-detection models to historical museum records is not a straightforward process, as these models have strict data requirements that museum data usually do not meet."
"Here I will present a methodological road-map for using occupancy models to analyze historical museum records. I use simulated data-sets to identify how and when modeling decisions and patterns in data can bias inferences. I will focus primarily on the consequences of contrasting methodological approaches for dealing with species ranges and non-detections in both space and time. Finally, I will present an application of these methods to bees in North America and will present drivers of change for these species in the past 30 years."
Guzman says that the "overarching goal of my research is to develop statistical and computational methods to leverage large biodiversity datasets to learn about ecological processes. While we know that the distribution of some species is changing, it is actually very difficult to make reliable inferences as to which species are declining and by how much from the often messy and complex historical and spatial datasets that we have to work with — for example, historical museum records, where species occurrences are aggregated from studies with different sampling procedures."
"In order to address this gap," Guzman says, "my research focuses on determining if and how statistical models can be applied to historical records without yielding biased trends. In my research I also apply these statistical models to determine how the distribution of pollinators has changed through time, where museum records provide lots of information. I am also interested in determining which drivers (e.g. pesticide use, climate change, land use change, etc.) are causing the most decline of the most pollinator species."
"Another aspect of my research is to understand the processes that shape communities, for example, I have combined experiments and modelling to understand how the structure of body size in a community affects the stability of food webs. In more recent work, I used large-scale simulations and machine learning to identify the signal of metacommunity processes in ecological time series."
Guzman is a Gabilan assistant professor in USC's Department of Biological Sciences. She received two degrees from McGlll University: her bachelor's degree (2012) in biology and her master's degree (2013) in ecology and evolution. She obtained her Ph.D. at the University of British Columbia.
She recently co-authored a piece in the journal Ecology titled "A Data Set for Pollinator Diversity and their Interactions with Plants in the Pacific Northwest," published in November 2022.
The abstract:
"Pollinator populations have declined substantially in recent years. The resulting loss in pollination services has both ecological and economic consequences, including reductions in plant diversity and crop production and lower food security. Data sets that identify pollinators and their plant hosts are of the utmost importance for the light can shed on the main causes of pollinator declines. Here we present a data set that contains 67,954 individual pollinator records. The data were collected across the Pacific Northwest, primarily focused in British Columbia (Canada), with 182 individual sites over 11 years, between 2005 and 2017. This data set comprises multiple studies that aimed to collect information on pollinator abundance, diversity, and their interactions with plants. Overall, the data set includes 937 morphospecies (of which 482 were identified to the species level) of pollinators across 105 families, including data for bees, wasps, butterflies, moths, and flies. We also present information on the interactions of these species, with 473 species of plants. The data set is being released for noncommercial use only. Credits should be given to this paper (i.e., proper citation)."
Guzman won the American Society of Naturalists Young Investigator Award, 2022-2023, and the Canadian Society of Ecology and Evolution Early Career Award, 2022-2023.
For any technical Zoom issues, contact seminar coordinator Brian Johnson at brnjohnson@ucdavis.edu. The full list of spring seminars is here.
- Author: Kathy Keatley Garvey
Don't head over to the Bohart Museum of Entomology in the Academic Surge Building on Crocker Lane on Saturday, April 20 during the 110th annual UC Davis Picnic Day.
Why?
It will be closed.
The Bohart Museum, part of the UC Davis Department of Entomology and Nematology (ENT), will be staffing a pop-up tent from noon to 4 p.m. in front of Briggs Hall, home of the department.
That means all the "bug" displays at the 2024 UC Picnic Day will be at one place: Briggs Hall. The Bohart has provided a QR code and the location:
https://maps.app.goo.gl/DLBmhLuEnP1rWjn67.
Tabatha Yang, education and outreach coordinator, says the Bohart Museum is planning four areas of interest:
- The "Oh, my drawers," (California arachnids and wing diversity showcasing cicadas and California dogface butterflies.
- Petting zoo of live insects (thorny sticks), which attendees can hold and photograph. Also shown will be a cicada nymph (from retired Bohart senior museum scientist Steve Heydon) and horntail caterpillars from UC Davis biology lab manager and UC Davis alumna Ivana Li.
- A Bohart poster giveaway--California dogface butterflies.
- A dogface butterfly face banner where attendees can pose for photos
The California dogface butterfly, Zerene eurydice, is California's state insect, as authorized by the State Legislature in 1972. The butterfly is found only in California, from the foothills of the Sierra Nevada to the Coast Ranges and from Sonoma south to San Diego. Its most prevalent habitat is in Auburn at the Placer Land Trust's private conservation site (which the public can see through specially guided tours). Why is it there? Because its larval host plant, false indigo (Amorpha californica) thrives there.
The male, which sports a yellow silhouette of a dog's head on its wings, is known as "the flying pansy." The female is mostly solid yellow except for a single black spot on its upper wings.
Kareofelas serves as a docent or volunteer tour guide for the Placer Land Trust's dogface butterfly site. He has reared--and photographed--a dogface butterfly from egg to adult. And he's also grown false indigo.
The posters to be given away Saturday--until gone--are the work of Kareofelas and Keller and depict the male and female butterfly.
Theme of the Bohart Museum's Picnic Day display is "Bonding with the Bohart," in reference to Professor Jason Bond, who succeeded UC Davis distinguished professor emerita Lynn Kimsey as director on Feb. 1. Kimsey served 34 years as the director. Although officially retired from the university, she continues to serve as a researcher, and as the executive director of the Bohart Museum Society and editor of the newsletter. Bond is the Evert and Marion Schlinger Endowed Chair of the Department of Entomology and Nematology, and the associate dean, UC Davis College of Agricultural and Environmental Sciences. He also serves as president-elect of the American Arachnological Society.
In addition to the Bohart Museum displays, the entomological events at Briggs Hall will include:
Bug Doctor
Briggs Hall Entryway
Graduate students will answer questions about insects. What's that bug? Attendees are encouraged to bring an insect or photo for identification.
Cockroach Races
Front of Briggs Hall
American cockroaches, Periplaneta americana, from Bob Kimsey's forensic lab, race on a specially made track, while roach fans cheer for their favorites. (Sometimes the athletes are named for faculty, friends or bystanders.
Medical Entomology
122 Briggs Hall
Carla-Cristina "CC" Melo Edwards of the Geoffrey Attardo lab is coordinating the medical entomology display. Her research focuses on investigating the physiological mechanisms underlying pyrethroid resistance in Aedes aegypti (the yellow fever mosquito).
Diversity of Arachnids
122 Briggs Hall
Doctoral student Emma Jochim of the Jason Bond lab is coordinating an exhibit she created last year to display the diversity of arachnids, such as vinegaroons, whip spiders, tarantulas, and scorpions. "We'll have live animals and fact sheets that will give a general overview of their diversity, behavior, and habitat," Jochim said. "I'll also bring some curated specimens to show what goes into creating a scientific collection and talk about why collections are important for understanding biodiversity. "
Maggot Art
Briggs Courtyard
Artists--children and adults alike--create maggot art by dipping a live maggot into water-based, non-toxic paint. It's suitable for framing (or at least a spot on the refrigerator door). This activity will close at 3.
Dr. Death
122 Briggs Hall
Forensic entomologist Robert Kimsey will display and discuss his work.
Entomology at UC Davis
122 Briggs Hall
Displays of insects, including bees, ants and more. Graduate students, faculty and emeriti will staff the tables.
Fly-Tying
Briggs Hall courtyard
Fly Fishers of Davis will show attendees how to tie a fly. The recipients take home the flies.
Insect-Themed T-Shirt Sales
Briggs Hall entryway
Members of the Entomology Graduate Student Association (EGSA), led by president Mia Lippey, will be selling their popular insect-themed t-shirts, including The Beetles.
Mosquito Control Booth
Entrance to Briggs (below front steps)
Sacramento-Yolo Mosquito and Vector Control District will be providing information on mosquitoes, answering questions, and offering give-a-ways.
UC Statewide Integrated Pest Management (UC IPM)
Briggs Hall Courtyard
“We plan to have many of our usual materials on display and will be giving out the live lady beetles (aka ladybugs) again,” said urban and community IPM educator Lauren Fordyce. “We purchase them from a local garden center. In addition to that, we plan to have a prize wheel that adults and kids can spin, answer a question, and win a prize if they answer correctly. We may also have temporary insect tattoos to give away.”
- Author: Kathy Keatley Garvey
The UC Davis Department of Entomology and Nematology will not only celebrate insect and nematode diversity at Briggs Hall during the 110th annual UC Davis Picnic Day on Saturday, April 20, but also "The Diversity of Arachnids."
Doctoral student Emma "Em" Jochim of the Jason Bond lab is coordinating an exhibit she created last year to display the diversity of arachnids, such as vinegaroons, whip spiders, tarantulas, and scorpions.
"We'll have live animals and fact sheets that will give a general overview of their diversity, behavior, and habitat," Jochim points out. "I'll also bring some curated specimens to show what goes into creating a scientific collection and talk about why collections are important for understanding biodiversity."
Emma holds a bachelor's degree in biology, with a minor in geology and chemistry, from Millsaps College, Jackson, Miss., where she graduated summa cum laude. Her honors thesis: "Species Delimitation of Vaejovis Scorpions from the Santa Catalina Mountains Using Genetic, Morphological, and Geographical Data." While a student at Millsaps College, her outreach activities including sharing her knowledge of tarantulas, scorpions and vinegaroons at the Mississippi Museum of Natural Science.
At UC Davis, her advisor is Professor Jason Bond, the Evert and Marion Schlinger Endowed Chair of the Department of Entomology and Nematology; the director of the Bohart Museum of Entomology; and associate dean, UC Davis College of Agricultural and Environmental Sciences. He's also the president-elect of the American Arachnological Society.
What can you see at Briggs Hall during UC Davis Picnic Day? Cockroach races, maggot art, walking sticks, flies, ants, bees, nematodes, beetles, butterflies, mosquitoes and more. The UC Davis Entomology Graduate Student Association will be selling insect-themed T-shirts. (See news story)
Most Briggs Hall events are from 9 a.m. to 5 p.m., announced the co-chairs, doctoral student Grace Horne and forensic entomologist Robert Kimsey. This year the Bohart Museum of Entomology, part of the Department of Entomology and Nematology, will staff a pop-up tent in front of Briggs from noon to 4 p.m. The theme: "Bonding with the Bohart." Visitors can hold walking sticks and Madagascar hissing cockroaches from the Bohart's live petting zoo, and see insect specimens, including butterflies, bees, beetles and dragonflies. (The Academic Surge Building, home of the Bohart Museum, will be closed on Picnic Day).
- Author: Kathy Keatley Garvey
Ever seen an angler tie a fly?
You will if you visit Briggs Hall during the 110th annual UC Davis Picnic Day on Saturday, April 20.
"The Art of Fly Tying" by the Fly Fishers of Davis is an integral part of the insect events and activities at Briggs Hall, home of the UC Davis Department of Entomology and Nematology.
The anglers are eager to show you how to tie a fly and then gift it to you.
At the 2022 UC Davis Picnic Day, we remember veteran fly fisherman Paul Berliner asking a six-year-old girl if she'd like a fly tied for her.
She wasn't sure at first, but when she saw the neon pink feather, she was hooked. She loves pink.
The Fishers of Davis is a "non-profit organization with 100+ members from communities in the central Sacramento valley," the website indicates. "Our charter is to promote the art of fly-fishing and to protect our natural resources and fisheries through community education and conservation...Our meetings and membership are open to the public, and we provide equal opportunity membership without any discrimination."
During the COVID pandemic and the cancellation of UC Davis Picnic Day, many organizations went virtual with presentations. The Fly Fishers created a video (click here), narrated by Berliner that won a second-place award in the UC Davis Picnic Day's Blue and Gold category, spotlighting health, recreation and athletics. Also check out Berliner's videos on YouTube)
The Fly Fisher meetings, open to the public, are held the last Tuesday of each month, with a social at 7 and the general meeting at 7:30. (See website for details). All members receive the club's monthly newsletter, “The Fisherman's Line.” See the Newsletters for the current edition and back editions. Yearly dues for adults and families are $30 per year. Yearly dues for students are $15 per year.
Typical meetings include the following:
- An introduction of new members, and reports on who has been fishing.
- A guest speaker who narrates a presentation covering some aspect of fly-fishing or conservation.
- An available library of books and videos for members to sign out.
- Updates on where to fish, club activities, outings, and conservation projects.
Outings take them to such fly-fishing sites as Pyramid Lake, Lake Berryessa, McCloud River, Lake Davis and Trinity River and more.
"Do our members ever get skunked on a fishing trip?" is one of the questions posted on the website. The answer: "Never! (Though, as highly trained professionals, we never admit it.)"
For other insect-related activities at Briggs Hall during the UC Davis Picnic Day, click here.
- Author: Kathy Keatley Garvey
When the UC Davis Department of Entomology and Nematology hosts its "bug activities" at Briggs Hall during the 110th annual UC Davis Picnic Day on Saturday, April 20, one of the most popular is maggot art.
Children and adults alike create maggot art by using plastic forceps to dip a live maggot into water-based, non-toxic paint. They then watch it--or guide it--to make the drawing they're seeking.
The result: It's suitable for framing (or at least a spot on the refrigerator door).
Rebecca O'Flaherty, a former graduate student of UC Davis forensic entomologist Robert "Bob" Kimsey, coined the educational teaching curriculum, "Maggot Art," back in 2001 when she was studying at the University of Hawaii and rearing blowflies for her forensic research.
Then, asked to create an activity to draw the interest of elementary school students, she came up with "Maggot Art." She also wanted a way to generate interest and respect for forensic entomology,
It quickly drew national interest. The CSI television show featured one of her works, “Ancient Offering,” which hung on the permanent set in Gil Grissom's office. O'Flaherty also exhibited her work at art shows, including a two-month exhibition at the Capital Athletic Club, Sacramento, in 2007.
Today, maggot art activities occur sporadically throughout the country. The Entomological Society of America acknowledged O'Flaherty here. "The basic premise is dipping prepuparial blow fly larvae (Diptera: Calliphoridae) into non-toxic ink and then placing them on a piece of paper or file card and letting them crawl around to create an abstract picture. Different larvae are used in different colours to create the picture. Rebecca O'Flaherty first demonstrated this at a North American Forensic Entomology Association Meeting many years ago, and it is a popular activity and many youtubes can be viewed to see how it works."
Sometimes the young artists get quite attached to a maggot and ask an event coordinator or parent if they can take it home. (Nobody ever gets a "yes!")
(For a complete list of bug activities at Briggs Hall, see the UC Davis Entomology and Nematology website. This year the Bohart Museum of Entomology display and live petting zoo also will be at Briggs. The Bohart headquarters in the Academic Surge Building will be closed on Picnic Day)