GROWING FROM THE BOTTOM UP—WHOI Scientist Mary Carman examines the invasive, filter-feeding sea squirt species of the genus Didemnum living in the tidepools at Sandwich Town Beach on Cape Cod. This species spreads up from the bottom of rocks as it grows, covering everything in its path, including vegetation and shellfish. "Anyone who likes to eat seafood should worry about this," Carman said. (Photo by Tom Kleindinst, WHOI Graphic Services)[back]
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