Microplastics and tire-derived contaminants are growing concerns for aquatic ecosystems. These pollutants can enter waterways through multiple pathways, including urban runoff, potentially exposing aquatic organisms to both particulate pollution and associated chemicals. Our research investigates microplastic distribution and the biological effects of tire-derived contaminants, with particular emphasis on fish species of conservation concern.
When the rubber meets the river : 6PPD quinone
6PPD-quinone (6PPD-Q) is a transformation product of 6PPD, a chemical additive used to protect tires from degradation. This contaminant has been linked to acute mortality in Coho Salmon, raising concerns about its potential effects on other aquatic species. Through a Segarra Lab-led project funded by the California Department of Fish and Wildlife, we investigated the acute and sublethal toxicity of 6PPD-Q in fish species of conservation concern, including Delta Smelt, Longfin Smelt, Chinook Salmon, Coho Salmon, and Steelhead Trout. By combining controlled laboratory exposures with behavioral and physiological assessments, this research aims to improve our understanding of species sensitivity and the potential consequences of tire-derived pollution for aquatic ecosystems.
Ph.D Student, Jackie Lang, poses over her juvenile Steelhead behavioral study. The fish are placed into clear bowls containing clean water and recorded for 15 minutes. These videos are later analyzed with Ethovision software.
Post Doctoral Student Louise Cominassi directs undergraduate Dylan Lin during a swim test on the exposed Steelhead. Here, fish are first tested for swimming proficiency then weighed and measured.