"Mike Connor" wrote in message
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"Wolfgang" schrieb im Newsbeitrag
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SNIP
Interesting that they are burgeoning both here and there. One wonders
whether the same sorts of dynamics are at work.....and what they might
be.

SNIP

Ongoing and well founded research suggests that the dynamics are much the
same. The single main cause being the massive overfishing of food chain
items. Large areas of ocean around the Americas are now almost devoid of
life, forcing birds and other predators to seek alternatives. These
alternatives are of course also slowly, or even rapidly eroded, as the
birds then increase to beyond what the resource can bear, and then go into
sharp decline, but only after much damage and destruction has taken place.

I can't deny that overharvesting the cormorants' food supply in marine
habitats has contributed to their dispersal in search of greener pastures,
but the Great Lakes even at their most fecund are virtually sterile as their
compared to oceanic environments. There must be something more going on, I
think.

Wolfgang