sargassum

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Kingdom: Protista
Division: Heterokontophyta
Class: Phaeophyceae
Order: Fucales
Family: Sargassaceae
Genus: Sargassum
Species of this genus which may grow to a length of several metres, they are generally brown or dark green in color and consist of a holdfast, a stipe, and a frond. Oogonia and antheridia occur in conceptacles embedded in receptacles on special branches.[1] Some species have berrylike gas-filled bladders which help keep the plant afloat thus promoting photosynthesis. Many have a rough sticky texture, which together with a robust but flexible body, helps it to withstand strong currents.
The thick masses of Sargassum provide an environment for a distinctive and specialised group of marine forms, many of which are not found elsewhere.
Sargassum is commonly found in the beach drift near sargassum beds where they are also known as Gulfweed, and colloquially as the weed of deceit , a term also used to include all seaweed species washed up on shore.
Sargassum species are found throughout tropical areas of the world and are often the most obvious macrophyte in near-shore areas where sargassum beds often occur near coral reefs. The plants grow subtidally and attach to coral, rocks or shells in moderately exposed or sheltered rocky or pebble areas. In some cases (e.g. the Sargasso Sea) there are floating populations of sargassum.
yes it will consume nutrients and it does require a light.
 
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