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SPOT review: toxicity screening highlights some persistently impacted sites, multiple endpoints add value
Summary
UC Davis and Granite Canyon staff reported 2008–2024 toxicity results for Hyalella and Chironomus tests, noting most sites are stable but multiple endpoints and growth measures expanded detection of toxic sites and improved prioritization.
Bushra Khan and Granite Canyon staff summarized SPOT toxicity results through 2024 and explained how toxicity findings feed site selection and NTA prioritization.
"Toxicity markers are excellent screening tools to prioritize monitoring at the sites with impacted marker response," Khan said, describing results from Hyalella (amphipod) survival and growth and Chironomus (midge) endpoints. She noted that Hyalella is measured at all 90 sites while Chironomus is measured at 60 sites.
Key findings: Using 2008–2024 data, most sites showed stable or no trend for the four toxicity markers, but several sites showed upward or…
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