oysters and ocean acidity

Discussion in 'Environment' started by Old Rocks, Apr 13, 2012.

  1. Old Rocks
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    Old Rocks Diamond Member

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    http://www.blog.thesietch.org/2012/04/12/ocean-acidification-killing-farmed-oysters/

    Marine researchers have definitively linked the collapse of oyster seed production at a commercial oyster hatchery in Oregon to an increase in ocean acidification.

    Larval growth at the hatchery declined to a level considered by the owners to be “non-economically viable.”

    A study by the scientists found that increased seawater carbon dioxide (CO2) levels, resulting in more corrosive ocean water, inhibited the larval oysters from developing their shells and growing at a pace that would make commercial production cost-effective.

    As atmospheric CO2 levels continue to rise, this may serve as the proverbial canary in the coal mine for other ocean acidification impacts on shellfish.

    Results of the research are published this week in the journal Limnology and Oceanography, published by the Association for the Sciences of Limnology and Oceanography (ASLO).

    The research was funded by a grant from the National Science Foundation (NSF)’s Science, Engineering and Education for Sustainability (SEES) Ocean Acidification solicitation.

    “Studies funded by NSF’s SEES Ocean Acidification solicitation are well-positioned to determine the specific mechanisms responsible for larval mortality in Pacific Northwest oyster hatcheries,” said David Garrison, program director in NSF’s Division of Ocean Sciences.

    “This is one of the first times that we have been able to show how ocean acidification affects oyster larval development at a critical life stage,” said Burke Hales, an Oregon State University (OSU) chemical oceanographer and co-author of the paper.
     
  2. Old Rocks
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    Old Rocks Diamond Member

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  3. Old Rocks
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    Old Rocks Diamond Member

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    Local News | Acidification threatens wide swath of sea life | Seattle Times Newspaper

    DABOB BAY, Hood Canal — Inside the burbling tubs of the Taylor Shellfish hatchery here, oysters are incubating once again. But no one believes things are really back to normal.
    Several years after oyster larvae around the Northwest began dying by the billions, hatcheries like this one are again ramping up production.

    But that's just because they've learned to avoid pumping in problem seawater.

    Few know better than Northwest oyster growers that ecological upheaval is still rattling their industry — and that it may be a sign of greater marine-world shifts to come.

    Pacific oysters in the wild on Washington's coast haven't reproduced in six seasons. Scientists suspect ocean-chemistry changes linked to the fossil-fuel emissions that cause global warming are helping kill these juvenile shellfish.
     
  4. Peach
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    Peach Gold Member

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  5. IanC
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    IanC Gold Member

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    letter sent to NOAA, but misleading statements still on their website-

    NOAA’s Pacific Marine Environment Laboratory Carbon Program goes overboard on ocean acidification – leaves uncorrected error | Watts Up With That?
     
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    Last edited: Jul 1, 2012
  6. IanC
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    IanC Gold Member

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    as usual the AGW catastrophists make misleading claims and weak minded sycophants like Old Rocks grovel in the excrement.
     
  7. Old Rocks
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    Old Rocks Diamond Member

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    More nonsense from an undegreed ex-TV weatherman. And you accept it over the expertise of real scientists. Here is an excerpt from a Royal Society report.

    http://royalsociety.org/uploadedFiles/Royal_Society_Content/policy/publications/2005/9634.pdf

    The oceans are absorbing carbon dioxide (CO2) from the atmosphere and this is causing chemical changes by making them more acidic (that is, decreasing the pH of the oceans). In the past 200 years the oceans have absorbed approximately half of the CO2 produced by fossil fuel burning and cement production. Calculations based on measurements of the surface oceans and our knowledge of ocean chemistry indicate that this uptake of CO2 has led to a reduction of the pH of surface seawater of 0.1 units, equivalent to a 30% increase in the concentration of hydrogen ions.

    Of course these are real scientist with decades of experiance in their fields, therefore not to be trusted. Ian, you are going off the deep end.
     
  8. idb
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    idb Gold Member

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    What do scientists know?
    Only commercial interests and crony politicians can really know what the causes are.
     
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  9. editec
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    editec Mr. Forgot-it-All

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    If the average PH of the oceans really change dramtically and rapidly this world truly is in serious trouble.
     
  10. flacaltenn
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    flacaltenn USMB Mod Staff Member Gold Supporting Member

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    I'll go with that "dissent" memo that IanC posted. That in areas of huge upwelling effects, it's IMPOSSIBLE to separate alledged man-made contributions to PH change from the NON - OA effect of bringing deeper more CO2 saturated colder waters to the surface.. And those that claim that they CAN TELL this -- are demented..

    [​IMG][/IMG]

    Note the min/max for PT conception and Pt Ano Nuevo.. Places where coastal upwelling is intense and HIGHLY NATURALLY variable.. Upwelling IS NOT related to man-caused OA except that it serves as a mixer with deep cold and surface waters.
    At any rate -- another example of LEAPING to conclusions and declaring the debate is over...
     
    Last edited: Jul 1, 2012

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