There are many examples of invasive algal and seaweed species. It is estimated that over 60 species have invaded the Mediterranean, 21 have taken to New Zealand, 28 along the Atlantic, and 18 in Hawai’i alone.
There are so many! Some behave in certain enviornments, but when given favorable conditions, will take over a body of water. Some algae that can behave this way in parts of the world include: Red, Green, and Brown algae, and “killer algae”–the alien seaweed Caulerpa taxifolia. On the East coast, Eurasian Milfoil has been a big problem for many years. http://www.invasivespeciesinfo.gov/aquatics/watermilfoil.shtml For those interested in botanic names:”Bryopsis plumosa, Polysiphonia elongata, Codium fragile, Colpomenia peregrina, Acrothamnion preissii, Womersleyella setacea, Lophocladia lallemandii, Stypopodium schimperi, Sargassum muticum, Caulerpa racemosa, Asparagopsis armata are some of the invaders of the Mediterranean Sea.”http://www.alga-net.com/environment/invasiveseaweeds.htm
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