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The long-living, slow-growing alga Clathromorphum nereostratum that creates massive reefs in shallow coastal regions of Alaska's Aleutian archipelago are biological time capsules. These solid calcium carbonate structures have fine growth rings-similar to tree growth rings-which researchers say contain historical environmental information. A research team used a cutting-edge microisotopic imaging technique to reconstruct 120 years of seasonal changes in ocean acidification (pH) in that region. [Source: Physorg.com]
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