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Dec
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2009
Some marine creatures build more shell in acidified waters
Comprar viagra baratos, The acidification of the ocean caused by rising atmospheric carbon dioxide levels is feared to weaken the shells of marine organisms. Köpa rabatterade viagra, But a new experiment shows that certain species actually increase their shell production under these seemingly harsh conditions.
Researchers raised 18 species of marine organisms in seawater acidified by different levels of carbon dioxide. Ten species – including some corals, comprar viagra, Farmacia viagra baratos, clams, oysters, comprare viagra sconto, New Jersey NJ N.J. , urchins, and scallops – produced less shell as carbon dioxide levels went up, ordering viagra online legally. Jotta viagra verkossa, But seven species, including lobsters and crabs, kjøpe billig viagra, αγοράζουν φτηνά viagra, built heavier shells at intermediate or high carbon dioxide levels.
The latter group may be able to convert bicarbonate, which forms after carbon dioxide dissolves in the ocean, cheap viagra online without prescription, Kjøp Discount viagra, into the carbonate that is needed for shell-building, the authors suggest in Geology, Vermont VT Vt. . Osta viagra online, And carbon dioxide may boost some organisms’ photosynthesis, giving them more energy to carry out the necessary chemical transformations.
But it’s too early to conclude that these hardier species will do better overall as the world’s carbon dioxide levels go up, order viagra no prescription, Pennsylvania PA Penn. , the authors say. For instance, spending more energy on shell-building could take away from other functions such as reproduction, says lead author Justin Ries of the University of North Carolina at Chapel Hill, comprar viagra baratos. And a predator that does well in acidified waters could still suffer if its thin-shelled prey goes under, District of Columbia DC D.C. . New Hampshire NH N.H. , – Roberta Kwok
Source: Ries, J., buy cheap viagra, Florida FL Fla. , Cohen, A., kjøpe viagra online, Nevada NV Nev. , & McCorkle, D, buy viagra no prescription. Nebraska NE Nebr. , (2009). Marine calcifiers exhibit mixed responses to CO2-induced ocean acidification Geology DOI: 10.1130/G30210A.1
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