1. Denitrification requires anoxic conditions to encourage the appropriate biological communities to form. 2. Taphonomic studies indicate that embryos are preserved for longest in reducing, anoxic conditions . 3. An opportunistic fauna briefly thrived there, before anoxic conditions returned. 4. Many animals also anoxic conditions , which can be further exacerbated by limited water flux. 5. In anoxic conditions they usually die within 12 hours. 6. This may result in anoxic conditions , which has implications for biogeochemical processes within the lake. 7. Reduction under anoxic conditions can also occur through process called anaerobic ammonium oxidation ( anammox ): 8. In the anoxic conditions where anaerobic respiration is dominant, calcium levels in the blood plasma increase. 9. Tirapazamine generates a free radical under anoxic conditions instead of the trigger mechanism of an enediyne. 10. Eutrophication devastates water ecosystems by inducing anoxic conditions .