Roadway Runoff Induced Acute Mortality in Juvenile Coho Salmon During Spring Storm Events.

ABSTRACT: Extensive mortalities of adult coho salmon (Oncorhynchus kisutch), often called "Urban Runoff Mortality Syndrome" (URMS), have been documented during the fall in creeks where water quality has been degraded by roadway runoff. The primary cause of mortality is 6PPD-quinone (6PPDQ; N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine quinone)-an ozone transformation product that forms on all vehicle tires. Laboratory studies have shown that juvenile coho salmon are highly sensitive to 6PPDQ exposure. Unlike adults, juveniles reside in impacted watersheds year-round, including during the spring when 6PPDQ concentrations can frequently exceed lethal thresholds during storms. To assess the potential incidence of URMS in springtime rearing habitats for juvenile coho sal

SUBMITTER: Brown ML 

PROVIDER: S-EPMC12825161 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature