The D.O. is dropping because of the snow cover and a couple inches of cloudy ice on top that doesn’t let much sunlight through. The bottom D.O. is now at the worst case level from last winter. Ice thickness is within 2 inches of last winter's maximum.
It looks like this winter may be more difficult for the pond inhabitants than last year because of the extended period of snow cover.
Not much to worry about so far, anyway.
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