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Clear Lake studies and tribal monitoring show seasonal community shifts and toxins in creeks and some tap water
Summary
University of Southern California sequencing found seasonal shifts in Clear Lake’s planktonic microbial community and a strong correlation between Microcystis and microcystin; the Big Valley Band reported high localized benthic toxin detections in creeks and a tap‑water detection in a household served by lake water.
Researchers from the University of Southern California and staff from the Big Valley Band of Pomo Indians presented complementary findings from Clear Lake and nearby creeks.
Isha Ora (presenter name recorded as "Echa Ora" in the transcript), representing USC, summarized a multi‑year DNA sequencing study of planktonic bacteria and microbial eukaryotes at five Clear Lake sites from 2019–2021. The sequencing work showed strong seasonal succession: picocyanobacteria (Cyanobium) dominated summer communities in the western lake arm, while Dolichospermum, Microcystis and other taxa…
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