Canceled due to COVID19 outbreak. Any updates will be posted here.


On Wednesday, March 11, from 12:00–1:00 pm please join us for the next Spatial Technology Lunch in the Center for Spatial Studies (Phelps Hall 3512). This semi-regular series, hosted by spatial@ucsb, aims to promote discussion and interaction within the university’s spatial technology community. Please RSVP here by Saturday, March 7. Sandwiches and drinks will be provided.

Spread of a virulent amphibian pathogen across the Sierra Nevada

Dr. Roland Knapp


Abstract: The global emergence of the amphibian chytrid fungus (Batrachochytrium
dendrobatidis: “Bd”) has caused the extinction of at least 90 frog species and the decline of
hundreds more. This impact has been called the most spectacular loss of vertebrate
biodiversity due to disease in recorded history. Bd is believed to have originated in Asia, but is
now distributed worldwide due to global commerce. In California’s Sierra Nevada mountains,
Bd emerged in the 1960s and subsequently spread across the range, causing precipitous
declines of the once-common mountain yellow-legged frog and its eventual listing under the
U.S. Endangered Species Act. Describing this spread, including identifying factors associated
with its arrival in frog populations, would allow better prediction of future spread and aid in the
identification of possible vectors. In this presentation, I will provide details on the patterns of
Bd spread in the Sierra Nevada and solicit input on how these data could best be analyzed.

Roland Knapp is a research biologist at the University of California Sierra Nevada
Aquatic Research Laboratory. His research interests include the population and conservation
biology of endangered mountain yellow-legged frogs in California’s Sierra Nevada mountains,
and the community ecology of montane lake ecosystems. The landscape-scale surveys of
aquatic habitats in the southern Sierra Nevada (7,000+ lakes and ponds) that he led form the
basis for ongoing amphibian and lake recovery efforts in Sequoia, Kings Canyon, and
Yosemite National Parks, and beyond. His current research focuses on the recovery of
mountain yellow-legged frogs in the presence of the recently-emerged amphibian chytrid
fungus (Batrachochytrium dendrobatidis).


Have any questions for Dr. Knapp before or after the discussion? Give him a shout at

[Canceled] Spatial Tech Lunch: Roland Knapp