Reaching out across the Web .. ...分享 Zuojun Yu, physical oceanographer, freelance English editor


珊瑚礁具有森林一样的反射光作用 (简译)

已有 1923 次阅读 2016-3-3 09:54 |个人分类:My Research Interests|系统分类:科普集锦|关键词:珊瑚礁,森林,反射光作用| 森林, 珊瑚礁, 反射光作用

Coral reefs scatter light like forests


By Devin PowellMar. 1, 2016 , 12:00 PM


A coral reef has more in common with a forest than you mightthink. When sunlight strikes a group of trees, some parts tend to get more sunthan others. Leaf tissue somewhat compensates for this by scattering lightoutward, helping to illuminate other leaves. A similar thing happens withcoral, researchers reported at the American Geophysical Union’s OceanSciences meeting in New Orleans, Louisiana. When scientists shone a laser at acoral, the coral’s colorful tissue spread the light, generally redistributingit to other parts. Coral’s white calcium carbonate skeleton also gets in on theaction. But it tends to spread light less, helping instead to focus it onspecific areas that would otherwise be in the shade. Coral can also rearrangethemselves depending on the circumstances, expanding to increase the spread oflight or contracting to minimize it. Yet even with all of these tricks, lightcan only penetrate so far into coral tissue; it tends to drop off the deeperyou go, as in forests, making getting by more difficult for cells at the bottomof tissue. So just as different cells in a leaf contain different amounts ofchlorophyll, coral cells seem to house different amounts of the photosyntheticalgae that makes their food, Symbiodinium.Cells specialized for low light to still make decent amounts of food in dimconditions, as measurements of photosynthesis (pictured here, showed. Snorkelersvisiting coral may not notice the canopy below, a much smaller and subtleraffair than the lofty bowers of forests on land. But the researchers argue thatunderstanding it is crucial for understanding how life gets by on the seafloor.

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