A more serious note along the same vein, Lately I have been walking along
the bank of the Ohio River from time to time, and I have noticed almost no
bivalves of any sort maybe a few Asiatic clams . . . When I was a kid
1960's, 70,s) it seemed that there were-in-least three common species of
native mussel, a few more rare types, and tons of Asiatic clams. Later (late
70's or early 80's), the old native mussels were very rare, but there was a
"bloom" of large "winged" mussels that resembled the old mussels in some
ways, but had a distinctly pink-purple coloration to the nacre. After that I
did not see much besides the Asiatic clam, until, a few years ago, I saw few
of anything but the Zebra mussel. Now even they are gone. . . .
This strikes me as odd--when I was a kid, we didn't really dare touch the
water, and I distinctly remember that the water was extremely murky. Now
the visibility looks much better, and I actually see kids playing in the
river (not mine), but from that same bank, the bivalve situation appears to
be dire, much worse than before. . .a long way from the time they would load
barges full of mussels into town to make pearl buttons out of them . . .
Does anyone have a clear picture of what is going on with the mussel
populations of the Ohio River? Is it all as bad as what I am seeing? I had
always figured that a lot of damage was done long before I was born, and
this later decline is a bit perplexing to me . . .If the native mussels
survived the sewage and the impoundment of the river, why after all of that
did they start declining just as the clean water act was taking effect?
From: owner-nanfa-l-in-nanfa.org [owner-nanfa-l-in-nanfa.org] On Behalf Of
Sent: Tuesday, March 21, 2006 7:19 PM
Subject: NANFA-L-- San Francisco Bay Invaders
A new ecosystem is forming in SF Bay.
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