Ivan Kobrinsky wrote:
For this feat they are using completely special light.
Instead of the sun the green sulfur bacteria use the weak
jets of hot sources of the deep sea for their photosynthesis.
Hum... photo-synthesis, photo is greek for light, right? The bacterias
you described seems to use the heat energy to do whatever is done and
not light energy, therefore it couldn't be called photosynthesis, could
it? I'm not a biologist and i don't even know much about it, but that
just seemed wrong.

I don't think it would be one of the main oxygen source anyway, so it's
a good enough approximation to consider only the oxygen generated by the
things that live right on top of the ocean water. Althought your
considerations are interesting, they might have been posted with a
different subject.