The brown algae or phaeophytes are a large group of multicellular algae, including many notable seaweeds. They play an important role in marine environments. For instance Macrocystis kelp, which may reach 60 metres in length, form prominent underwater forests. Another notable example is Sargassum, which creates unique habitats in the Sargasso Sea (hence the name Sargassum). Many brown algae, such as bladder wrack, are found along the seashore and some are used as food. Cropped from PhotoCD image, from Kodak ISO 800 film, taken by k. ... Olympic National Park is located in the U.S. state of Washington, in the far northwestern part of the state known as the Olympic Peninsula. ... Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms. ... Typical phyla Rhodophyta (red algae) Chromista Heterokontophyta (heterokonts) Haptophyta Cryptophyta (cryptomonads) Alveolates Pyrrhophyta (dinoflagellates) Apicomplexa Ciliophora (ciliates) Excavates Euglenozoa Percolozoa Metamonada Rhizaria Radiolaria Foraminifera Cercozoa Amoebozoa Choanozoa Many others; classification varies The Kingdom Protista or Protoctista is one of the commonly recognized biological kingdoms, including all the eukaryotes except for... Typical classes Colored groups Chrysophyceae (golden algae) Synurophyceae Actinochrysophyceae (axodines) Pelagophyceae Phaeothamniophyceae Bacillariophyceae (diatoms) Raphidophyceae Eustigmatophyceae Xanthophyceae (yellow-green algae) Phaeophyceae (brown algae) Colorless groups Oomycetes (water moulds) Hypochytridiomycetes Bicosoecea Labyrinthulomycetes (slime nets) Opalinea Proteromonadea The heterokonts or stramenopiles are a major line of eukaryotes. ... Families Alariaceae Chordaceae Laminariaceae Lessoniaceae Phyllariaceae Pseudochordaceae Kelp are large seaweeds, belonging to the brown algae and classified in the order Laminariales. ... A seaweed (Laurencia) up close: the branches are multicellular and only about 1 mm thick. ... Seaweed covered rocks in the UK Phycologists consider seaweed to refer any of a large number of marine benthic algae that are multicellular, macrothallic (large-bodied), and thus differentiated from most algae that tend to be microscopic in size (Smith, 1944). ... Families Alariaceae Chordaceae Laminariaceae Lessoniaceae Phyllariaceae Pseudochordaceae Kelp are large seaweeds, belonging to the brown algae and classified in the order Laminariales. ... Kelp Forest Kelp forests are a type of marine ecosystem established around colonies of kelp; they contain rich biodiversity. ... Classification: Eukaryota Phylum-Heterokontophyta Order-Fucales Family-Sargassaceae. ... An image of the distribution and size of eel larvae shows the approximate location of the Sargasso Sea. ... Binomial name Fucus vesiculosus L. Bladder wrack is a seaweed found on the coasts of the North Sea, the western Baltic Sea, and the Atlantic and Pacific Oceans. ...
Brown algae belong to a large group called the heterokonts, most of which are colored flagellates. Most contain the pigment fucoxanthin, which is responsible for the distinctive greenish-brown color that gives brown algae their name. Brown algae are unique among heterokonts in developing into multicellular forms with differentiated tissues, but they reproduce by means of flagellate spores, which closely resemble other heterokont cells. Genetic studies show their closest relatives are the yellow-green algae. Typical classes Colored groups Chrysophyceae (golden algae) Synurophyceae Actinochrysophyceae (axodines) Pelagophyceae Phaeothamniophyceae Bacillariophyceae (diatoms) Raphidophyceae Eustigmatophyceae Xanthophyceae (yellow-green algae) Phaeophyceae (brown algae) Colorless groups Oomycetes (water moulds) Hypochytridiomycetes Bicosoecea Labyrinthulomycetes (slime nets) Opalinea Proteromonadea The heterokonts or stramenopiles are a major line of eukaryotes. ... Fucoxanthin is a carotenoid, with formula C40H60O6. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... Yellow-green alga belong to the phylum Heterokontphyta, class Eustigmatophyta. ...
When concentrations of this alga reach 1-2 million cells per milliliter of water, the water appears brown, taking on the color of the alga and thus the term “brown tide.” Brown tide can withstand a wide range of salinities and temperatures, though it does best in warmer temperatures, and has very few natural predators.
Brown tides are patchy by nature and are often moved around by winds.
Brown tide was left without its natural predators, and the decomposition of organisms killed in the freeze introduced large levels of nitrogen into the bay, perhaps acting as a sort of “fertilizer” and allowing the brown tide to bloom out of control.
Brown pigments mask the green colour of the chlorophyll.
As well as examining the external characteristics of the brownalgae, the researchers from Leiden University and the University of Groningen also compared the DNA composition of the various species.
The alga is found off the coast of South China, is one to two centimetres long and grows in small tufts, which with a bit of fantasy can be compared to the hair under the armpits.
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