The Ecology and Evolutionary Biology Department has been working hard and monitoring, as well as planning, for COVID-19/Coronavirus and the safety of the UCLA community. We understand that we live in very uncertain times and with news about the virus changing frequently, we appreciate your cooperation. Please know the department is committed to working in everyone’s best interest—students, faculty, staff, and community at large.

Our Spring 2022 Seminar Series will be held in-person and virtually, unless otherwise noted.  Proof of full vaccination or a negative COVID test within 72 hours of the seminar is required for non-UCLA attendees.  Clearance from the UCLA Symptom monitoring website or app is required for UCLA attendees.

We appreciate your understanding at this time.

April 5, 2023

12:00pm, PST 1100 Terasaki Life Sciences Building (TLSB)

Laura Melissa Guzman

" Using Occupancy Models to Infer Trends of Bee Biodiversity Through Time "

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 inorder to enable robust inferences. 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. 

EEB Seminar-Guzman

Meeting ID: 957 6268 3387

Passcode: 499531

Host: Felipe Zapata