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The Jubilee at Mobile Bay has been going on since recorded history of the area, so one could hardly say it's influenced by man.
The bay here is very shallow for the most and can easily be influenced by by bad weather and extended periods of sunlight, which would certainly change the water's ability to retain O2. Other theories have to do with algea content and blooms which would of course be likewise influenced by the CO2 content.
Natural.
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