That is acidity, and one way it impacts the food chain is that it interferes with calcium carbonate in seawater, hampering the ability of shellfish to form shells.
Here is Craig Welch's report on how Goose Point Oysters of Willapa Bay is giving its oysters a headstart in higher pH Hawaiian waters.
"Willapa Bay oyster grower sounds alarm, starts hatchery in Hawaii" http://ow.ly/1O83s6
Also: Danny Westneat - "Acidic step" http://ow.ly/1O82I1
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TWIP Archive (2008): " Are machines the CO2 answer?" http://ow.ly/1O83Pq
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