Join Date: Dec 2010
Location: Murfreesboro, TN
I've actually been wondering the same thing recently.
If anyone knows please divulge.
I can think of only a few reasons.
The degradation of biomass I.E Leaves and Poo and dead animals, by bacteria, who convert something(whatever it may be) into co2.
Underground vents, geysers, etc.... I'm talking something to do with volcanism here.
And then there is the possibility that most aquatic plants don't actually live underwater year round, they are fully capable of surviving in a dormant stage, but just so as to wait for the flood waters to subside so they may be above water again.
I know there are plants that live underwater at all times, and they may very likely not require much co2.
In the case of plants in specific biotopes that receive biannual flooding, co2 might be required to make them grow underwater, by mimicking the above water environment, but they may not grow underwater in their natural habitat.
Just a wild guess.
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