The Washington Times-Herald

Community News Network

April 8, 2013

Crabs supersized by carbon pollution

(Continued)

WASHINGTON —

It was like watching lions tear apart lambs. The crabs scurried from their side of the tanks, banged on the shells of the traumatized oysters, pried them open with a claw in a way similar to what humans do with a knife at restaurants and gobbled them down.

For crab lovers, bigger doesn't necessarily mean better. Carbon-absorbing crabs put all their energy into upgrading shells, not flesh — like a mansion without much furniture. So diners might be disappointed years from now when they crack open huge crabs and find little meat.

The research showing the effects of carbon on marine organisms was published in the journal Geology in 2009. The study, led by Ries and co-authored with Anne Cohen and Daniel McCorkle, and found that crabs, lobsters and shrimp grew bigger more rapidly as carbon pollution increased. Chesapeake blue crabs grew nearly four times faster in high-carbon tanks than in low-carbon tanks.

But under the same conditions, oysters, scallops and other organisms struggle to grow, making them more vulnerable to carnivores. Oysters in high-carbon tanks grew at only one-quarter the speed they did in low-carbon conditions, according to the study.

"It's taking them longer to go from oyster spat to oyster adult," said Luke Dodd, a doctoral candidate at UNC who put the crabs in a tank with oysters. "When you're a baby, there's tons of predators that want to eat you up."

But when they put mud crabs and oysters together in the tanks polluted with carbon, Dodd, Michael Piehler of UNC and Jonathan Grabowski of Northeastern University observed something they didn't expect, a response that gave oysters a prayer.

Under conditions with lower levels of carbon, two mud crabs polished off 20 oysters in six hours. But in the aquariums with higher levels of carbon, the mud crabs seemed confused.

Text Only
Community News Network
  • Lindley, Tom.jpg Is this a commercial for batting gloves or a baseball game?

    Major league baseball desperately needs to speed up the action. Here's a place to start: Nix the mind-numbing ritual of hitters who first adjust the right batting glove, then the left one, after every single pitch.
     

    August 21, 2014 1 Photo

  • The Simpsons still going strong

    The groundbreaking animation first hit the air Dec. 17, 1989, but the family first appeared on television in "The Tracey Ullman Show" short "Good Night" on April 19, 1987.

    August 21, 2014

  • Does Twitter need a censor?

    Twitter decided last year to make images more prominent on its site. Now, the social network is finding itself caught between being an open forum and patrolling for inappropriate content.

    August 21, 2014

  • Police chief resigns over racial slur repost to Facebook

    A repost on his personal Facebook page of a racially-charged comment by the original poster of a comedy video has forced the police chief of an Oklahoma city to resign his office.

    August 21, 2014

  • sleepchart.jpg America’s sleep-deprived cities

    Americans might run on sleep, but those living in the country's largest cities don't appear to run on much.

    August 20, 2014 1 Photo

  • Who should pay for your kids ACT?

    Thirteen states paid for 11th-grade students in all public high schools to take the ACT college admission test this year, with several more planning to join them in 2015.

    August 20, 2014

  • Pets.jpg Why do people look like their pets?

    As much as we might quibble over the virtues and vices of Canis domesticus, however, and over whether human nature is any better or worse than dog nature, even dog fanciers don't usually want to look like a dog.

    August 20, 2014 1 Photo

  • Ice bucket challenge trending up

    Internet trends are a dime a dozen these days. Everything from Tebowing to planking to the cinnamon challenge can cause a wave of social media activity that can last for weeks before fizzling out.

    August 19, 2014

  • Africa goes medieval in its fight against Ebola

    As the Ebola epidemic claims new victims at an ever-increasing rate, African governments in Sierra Leone, Guinea and Liberia have instituted a "cordon sanitaire," deploying troops to forcibly isolate the inhabitants in an area containing most of the cases.

    August 18, 2014

  • Democrat? Republican? There's an app for that

    If you're a Republican, you might want to think twice before buying Lipton Iced Tea, and forget about Starbucks coffee. If you're a Democrat, put down that Reese's Peanut Butter Cup, and throw away the cylinder of Quaker Oats in your pantry.

    August 18, 2014