Thinking Frogs

With the long weeks of frigid temperatures, the pond has frozen over with a thicker layer than usual.  Concerned about the oxygen getting depleted in the water and losing the frogs that are likely brumating at the bottom, I finally purchased a pond deicer.  Last year the frogs made it through fine...but, I think the ice would melt (or I'd melt it) often enough for the exchange of gases.  With talk on Wildlife Gardeners of losing frogs in man made ponds, I thought it best to play it safe.  Now, the birds can benefit as well with another source of liquid water (there is a stream about a fourth of a mile from here).