Dysoxic

Bralower T. J., Sliter W. V., Arthur T. J., Lekie R. M., Allard D. J., and Schlanger S. O. (1993) Dysoxic/anoxic events in the Aptian-Albian (Early Cretaceous). In The Mesozoic Pacific Geology, Tectonics, and Volcanism, American Geophysical Union Monograph 77 (eds. M. S. Pringle, W. W. Sager, W. V. Sliter, and S. Stein), pp. 5-37. 

Denitrification The bacterial rednction of dissolved N03 to gaseous N2. Denitrifying organisms reqnire anoxic or dysoxic conditions. This process typically occurs under the anoxic conditions present in subsurface lake sediments and in the hypolimnions of strongly stratified lakes. 

Dysoxic The transitional zone between oxic and anoxic environments, where dissolved oxygen concentrations are in the range of 0.01-1.0 ml 1 . May also be called the dysaerobic zone. 

Oxic An environment having normal oxygen concentrations. In lakes this commonly implies dissolved O2 concentrations in the range of 2.0-7.0 ml 1 (cf. anoxic, dysoxic). 

Oxycline A zone within the water column where the dissolved oxygen content declines steeply. Waters above the oxycline are commonly oxic, those below anoxic the lower part of the oxycline itself may dysoxic. It is a permanent feature of meromictic lakes and in other water bodies may appear during the period of seasonal stratification. 

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