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Abstract Title: Using Mercury Isotopes to Trace Methylmercury Sources of Deep-sea Fauna Living in Extreme Ecosystems
Presenter Name: Jingjing Yuan
Company/Institution: Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin, China
Session: Mercury in Marine Ecosystems
Day and Session: Thursday 28th July - Session Three
Start Time: 12:00 UTC
Co-Authors: Jingjing Yuan,Ruoyu Sun,Yi Liu,Shun Chen,Xiaotong Peng,Lars-Eric Heimbuerger-Boavida

Abstract Information :

Oceans are the primary mercury (Hg) reservoir on the surface Earth where the toxic methylmercury (MeHg) is produced. However, Hg and MeHg sources and cycling in deep oceans are not well understoood. We measured concentrations of total Hg (THg) and MeHg, as well as THg stable isotopes in fauna (amphipod, mussel, snail, etc.) from different deep-sea extreme ecosystems (trench, hydrothermal vent and cold seep). We find that the hydrothermal fauna had significantly higher THg concentrations of 927 ñ 1883 ng/g than fauna at the trench (547 ñ 236 ng/g) and cold seeps (109 ñ 90 ng/g). In contrast, MeHg concentrations in fauna from hydrothermal vents (61 ñ 172 ng/g, 3% of THg concentrations) and cold seeps (4.62 ñ 0.28 ng/g, 7% of THg concentrations), were much lower than trench fauna (152 ñ 222 ng/g, 28% of THg concentrations). Both ?202Hg (-0.05 to 0.54?) and ?199Hg (1.26 to 1.70?) of trench fauna are comparable to marine fishes at 300-600 m depth, indicating that the accumulated MeHg in trench fauna originates from the upper ocean (

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