在线英语听力室_免费在线英语听力学习网站

 This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute.

Spending your life hanging out at the seaside might sound like easy living. But for marine¹ mussels, a day at the shore is no walk on the beach. Clinging to a boulder² in the intertidal zone, a mussel might find that the temperature of its environment changes 50 degrees in a matter of hours, depending on whether it’s bathed in cool seawater or baking in the sun. To handle such challenges, mussels have evolved a sophisticated strategy for systematically³ turning on and off the genes⁵ they need to survive.

Scientists from the University of Southern California spent a few days sampling mussel beds just south of the Monterey Bay Aquarium⁶. Every few hours, they collected the mussels’ genetic⁷ material and spread it on a gene⁴ chip to figure out which genes were active, and when. To their surprise, they found that mussels coordinate⁸ their gene activity in waves, alternating between genes responsible for growing and genes responsible for eating. And the harsher the environment, the more pronounced the oscillations, results that appear in the October 9th issue of Current Biology. It’s not yet clear what drives these gene cycles. But it seems that even mussels know that you gotta ride the wave if you want to avoid a wipeout.

Thanks for the minute for Scientific American's 60-Second Science. I'm Karen Hopkin.