Thanks for the info Eric, It seems the more info we get the more questions I have, maybe using some brain cells will help off set getting Alzheimer's.
TJ, "IT ALL DEPENDS", probably the best phrase ever uttered on this site and seems to apply to this topic.
My uneducated opinion is that PS's being more tolerant of temp. extremes, especially up north, combined with withstanding wide PH fluctuations, and possibly lower O2 requirements allow them to survive where RES & BG are marginal allowing them to keep multiplying.
There's probably lots of holes in that statement and I would like to hear them.
