Celani et al. already found species adapted to heavy water: Ralstonia detusculanense.
http://www.uniprot.org/taxonomy/148618 And one other. See the papers at LENR-CANR.org. This stuff in the heavy water from Ontario Hydro (which I think has a new name). It adapted sometime in the last 50 years. Evolution works faster than you might think. - Jed
