Gourt > Kids and Teens > School Time > Science > Living Things > Plants and Trees > Aquatic Plants > Algae and Seaweed
Biologists, specifically phycologists, consider seaweed to be any of a large number of marine benthic algae that are multicellular, macrothallic, and thus differentiated from most algae that tend to be microscopic in size Smith, G.M. 1944. Marine Algae of the Monterey Peninsula, California. Stanford Univ., 2nd Edition.. Many phycologists prefer the term "marine macroalgae" over "seaweeds". Seaweeds are classified into brown (Phaeophyta), red (Rhodophyta) and green algae (Chlorophyta) based on their pigment composition. There are a few species of cyanobacteria however, that may also be categorized as seaweeds. Seaweeds are to be confused neither with things like seagrasses (which are vascular plants), nor actual weeds in the sense of nuisance blooms or accumulations of unwanted species — certainly, seaweeds are natural components of pristine marine ecosystems.
Structure
Seaweeds may have an appearance that resembles non-arboreal terrestrial plants.
- thallus: the algal body
Uses
Seaweeds are extensively used as food by coastal peoples, particularly in Japan and Korea, but also in China, Vietnam, Indonesia, Peru, the Canadian Maritimes, Scandinavia, Ireland, Wales, Philippines, and Scotland, among other places. For example, Porphyra is a red alga used in Wales to make laverbread, and in Japan dried, formed into sheets called nori which is widely used in soups, and for wrapping sushi, boiled rice stuffed with bits of raw fish, sea urchin roe, or other ingredients. Chondrus crispus (commonly known as Irish moss) is another red alga used in producing various food additives. More on [ Seaweed ]
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Algae - Brief introduction to algae and other marine plants, with more information on subspecies such as the green algae, sargassum, and brown algae.
Meta Description: [ Answer the question: What's It Like Where You Live? Learn about terrestrial biomes and aquatic ecosystems. Follow link to site about plants. ]
Red Tide and Harmful Algal Blooms - Introduces kids to algal blooms, a case where algae is environmentally hazardous.
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