Black Sea chemistry and biodiversity is highly coupled with the
lack of vertical currents, present in oceans or bigger seas.
(Some ) effects are limited salinity in the top layers - and
many ocean fish species cannot live in black sea - and limited
space for life (under 50 meters there is no oxygen) Can the
jellyfish population (which is exploding now) change the
stratification of water layers enough that the highly saline
waters from bottom go up, and oxygen goes down, allowing a
completely new ecosystem here? If yes, what are the outcomes of
such prospects? Besides the potentially catastrophic release of
hydrogen sulphide form the bottom, can it be an improvement for
the biodiversity here?