Trophic biomagnification or biodilution of Antioxidants in the Great Lakes foodweb

Session: Poster session

Gerald Tetreault, Environment and Climate Change Canada, [email protected]
Zhe Lu, Environment and Climate Change Canada, [email protected]
Amila De Silva, Environment and Climate Change Canada, [email protected]
Daryl McGoldrick, Environment and Climate Change Canada, [email protected]
Wenjia Zhou, Enviornment and Climate Change Canada, [email protected]
Thomas Peart, Enviornment and Climate Change Canada, [email protected]
Cyril Cook, Enviornment and Climate Change Canada, [email protected]
Pamale Martin, Enviornment and Climate Change Canada, [email protected]
Shane de Solla, Enviornment and Climate Change Canada, [email protected]

Abstract

Substituted diphenylamine antioxidants (SDPAs) and benzotriazole UV stabilizers (BZT-UVs) are industrial additives of emerging environmental concern. However, the bioaccumulation, biomagnification, and spatial distribution of these contaminants in the Great Lakes of North America are unknown. The present study addresses these knowledge gaps by reporting SDPAs and BZT-UVs in herring gull (Larus argentatus) eggs, lake trout (Salvelinus namaycush), and their food web in the Great Lakes for the first time. Herring gull eggs showed much higher detection frequency and concentrations of target SDPAs and 2-(2H-benzotriazol-2- yl)-4,6-di-tert-pentylphenol (UV328) than that of the whole body fish homogenate. For herring gull eggs, the upper Great Lakes contained significantly greater levels of SDPAs than eggs from lower lakes, possibly due to the differences in terrestrial food in diet. Interestingly, the predominant SDPAs in herring gull eggs were dinonyl- (C9C9) and monononyl-diphenylamine (C9) which were previously shown to be less bioaccumulative than other SDPAs in fish. In contrast, C8C8 was the major SDPA in lake trout, and biodilution of was observed in a Lake Superior lake trout food web. Such variations in herring gull eggs and fish indicate the differences in accumulation and elimination pathways of SDPAs and BZT-UVs and require more investigation.

1. Keyword
bioaccumulation

2. Keyword
trophic level

3. Keyword
food chains