Resource Availability Modulates Effects of Fluorine Free Firefighting Foams

Area of Science:

• Environmental Toxicology
• Ecotoxicology
• Freshwater Ecology

Background:

• Fluorine-free foams (F3s) are replacing per- and polyfluoroalkyl substances (PFAS) in firefighting, leading to their introduction into ecosystems.
• The ecological impact of F3s on freshwater communities, particularly sensitive zooplankton, remains largely unknown.
• Resource availability is a critical environmental factor that may influence F3 toxicity.

Purpose of the Study:

• To investigate the impact of two F3s (Avio and ECOPOL) on the life history of Daphnia magna under varying food conditions.
• To determine if food availability modulates the toxicity and life history effects of F3 exposure in zooplankton.

Main Methods:

• Daphnia magna were exposed to two F3s (Avio and ECOPOL) at different algae feeding levels (high food vs. no food).
• Life history traits including growth and reproduction onset were monitored.
• Starvation rates were assessed in the absence of food.

Main Results:

• At high food levels, sublethal F3 exposure led to earlier reproduction and increased growth in Daphnia magna, with no apparent tradeoffs.
• In the absence of food, exposure to one F3 (Avio) resulted in earlier starvation, indicating an energetic cost.
• F3s significantly altered Daphnia magna life history, with effects contingent on food availability.

Conclusions:

• Fluorine-free foams can substantially alter zooplankton life history, potentially impacting freshwater community dynamics and trophic cascades.
• The ecological consequences of F3 exposure are dependent on environmental factors like food availability.
• Further research is needed to understand the broader ecosystem-level effects of F3s.