Because SGD is often rich in reducing species (electron donors), its effect on the dissolved oxygen (DO) concentration in estuarine and coastal waters may be profound. It may create hypoxia (DO <2 mg/L) or tip a system with low DO into hypoxia. The primary electron donors in SGD are NH4+, H2S, CH4, DOC, & DON. Others, like S0, SO32-, S2O32-, Fe2+ & Mn2+ may be important in some systems. H2S and DON are rarely measured in SGD; we recommend including these in SGD analyses. Reaction kinetics play a strong role in DO depletion. We think NH4+ and H2S react quickly (<hours); DON and CH4 a bit slower (hours to days); while DOC comprises a wide range of species having half-lives of hours to millennia. Both field and lab studies are essential to provide estimated of reaction half-lives of these species. Protocols are required to develop rapid response teams for major coastal fish kills.
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Natasha Dimova
University of Alabama
Guizhi Wang
Xiamen University
Yael Kiro
Weizmann Institute of Science
Xiaoyi Guo
Ocean University of China
Soumya Nayak
Leibniz Centre for Tropical Marine Research
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Henrietta Dulai
University of Hawaii
Alex Cabral
Trinity College Dublin
lsaac Santos
University of Gothenburg
Xiaogang Chen
Westlake University
Subgroup Chair
Billy Moore
University of South Carolina