Characteristics and origins of methoxypolybrominated diphenyl ethers in tuna
Tuna,top predators in the marine food chain,are widely distributed in global oceans.It possess a strong capability for pollutant accumulation.Thus,tuna is commonly used as a vital bioindicator of marine pollution.In this study,129 tuna samples were collected from the Pacific,Atlantic,and Indian Oceans.MeO-BDEs were measured in their livers,in order to investigate the occurrence,distribution patterns,influencing factors,and potential sources.The results revealed two categories of MeO-BDEs were frequently detected in the samples,specifically 2'-MeO-BDE-68 and 6-MeO-BDE-47,which could be of natural origin.Further single-factor and multi-factor correlation analysis revealed a correlation between MeO-BDEs concentration in tuna and its habitat,with differences in sources among various habitats.A positive correlation between concentrations and δ13C(indicating food sources)was observed,suggesting MeO-BDEs associated with their respective habitats.Additionally,a weak negative correlation between δ15N and body length was due to the potential conversion of MeO-BDEs within larger tuna organisms at higher trophic levels.The results are helpful to understand the distribution characteristics of MeO-BDEs in tuna worldwide and the potential sources of these pollutants.
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