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The invasive tunicate Didemnum sp. is a colonial ascidian of unknown origin that has spread down the Atlantic Coast since its appearance in Maine during the 1980s. Mats of this tunicate were found to overgrow gravel, pebble, cobble, boulder, live and dead sea scallops, anemones, sponges, dead shells, other ascidians, barnacles, and rock crabs, and skate egg cases. Optical image surveys conducted with...
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