Andrew and Frank et al,
Look at the cichlids (fish)of Lake Victoria(?) in Africa.  Introduction of new
species by people made the water cloudy and prevented closely related species
from distinguishing each other (they were dependant on color patterns).  Now
there are fewer, blander species.  Not sure if this is at all applicable to
marine mollusks which probably use chemical cues to distinguish species, but at
the rate we are spreading pollutants into the environment, we may eventually
screw them up too.


Allen Aigen
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