Shellfish Face An Uncertain Future...
Thursday, November 12, 2009 at 9:50AM The hot topic of global warming caused by increased CO2 emissions into the atmosphere takes up a lot of space in the media. However, Increased CO2 levels can also impact the coastal zones around the world, possibly at a faster pace.
"... the problem begins when atmospheric CO2 dissolves in seawater and creates carbonic acid that is then rapidly transformed into carbonate and bicarbonate ions in the water. Increased acidity tips the balance toward bicarbonate formation and away from carbonate. Less carbonate in the water means that shellfish have fewer building blocks to generate their shells. If the water is acidic enough, shells can even begin to dissolve."
P. viridis from Nha Phu Bay, Vietnam
"Estuarine and coastal ecosystems may be especially vulnerable to changes in water chemistry caused by elevated CO2 because their relative shallowness, reduced salinity and lower alkalinity makes them inherently less buffered to changes in pH than in the open ocean," said Miller. For many calcifying organisms, CO2-induced acidification poses a serious challenge because these organisms may experience reduced rates of growth and calcification that when combined with other environmental stresses, could spell disaster."
Read the article at Sciencedaily.com
Journal refference: Miller et al. Shellfish Face Uncertain Future in High CO2 World: Influence of Acidification on Oyster Larvae Calcification and Growth in Estuaries. PLoS ONE, 2009; 4 (5): e5661 DOI: 10.1371/journal.pone.0005661
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