[Coral-List] Just in time for Copenhagen
David M. Lawrence
dave at fuzzo.com
Thu Dec 3 11:23:02 EST 2009
It seems WhatsUpWithThat missed significant parts of the story. Below
are excerpts from the WHOI press release, with my comments in brackets.
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The "take-home message," says Cohen, is that "we can’t assume that
elevated CO2 causes a proportionate decline in calcification of all
calcifying organisms." WHOI and the National Science Foundation funded
the work.
[Given the diversity of life on Earth, one would assume that there would
be variability in how individual species respond to changing conditions.
This may be news for a geologist, but not for those of us trained in
ecology.]
Conversely, some organisms—such as the soft clam and the oyster—showed a
clear reduction in calcification in proportion to increases in CO2. In
the most extreme finding, Ries, Cohen and WHOI Associate Scientist
Daniel C. McCorkle exposed creatures to CO2 levels more than seven times
the current level.
This led to the dissolving of aragonite—the form of calcium carbonate
produced by corals and some other marine calcifiers. Under such
exposure, hard and soft clams, conchs, periwinkles, whelks and tropical
urchins began to lose their shells. "If this dissolution process
continued for sufficient time, then these organisms could lose their
shell completely," he said, "rendering them defenseless to predators."
[While I hope we don't get to 7X CO2, the increasing metabolic costs of
extracting CO2 from a less favorable environment at lower CO2 levels
means that affected organisms won't have energy for other important
biological processes, including energy storage, immune defense, and
reproduction. This metabolic time bomb is analogous to the balloon
payments on those variable rate mortgages that just caused our economy
to tank.]
"The oceans absorb much of the CO2 that we release to the atmosphere,"
Ries says. However, he warns that this natural buffer may ultimately
come at a great cost.
"It’s hard to predict the overall net effect on benthic marine
ecosystems, he says. "In the short term, I would guess that the net
effect will be negative. In the long term, ecosystems could re-stabilize
at a new steady state.
"The bottom line is that we really need to bring down CO2 levels in the
atmosphere."
[I think the closing quote says it all.]
Eugene Shinn wrote:
> Those into ocean acidification will appreciate this. And yes GEOLOGY
> is a peer reviewed journal. Gene
> http://wattsupwiththat.com/2009/12/01/oh-snap-co2-causes-ocean-critters-to-build-more-shells/#more-13543
>
--
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David M. Lawrence | Home: (804) 559-9786
7471 Brook Way Court | Fax: (804) 559-9787
Mechanicsville, VA 23111 | Email: dave at fuzzo.com
USA | http: http://fuzzo.com
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