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Phaeophyta ( Brown Algae )

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jena lenning

on 26 May 2011

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Transcript of Phaeophyta ( Brown Algae )

Phaeophyta (Brown Algae) Classification Domain Eukaryota- Presence of membrane-bound cell organelles Kingdom Protista- simple organisms, usually microscopic. Phylum Heterokontophyta- Algae with cholorphyll a & c Class phaeophyceae- Brown algae have pigment fucoxanthin Genus-fucus Family-fucaceae Characteristics Phaeophyta is the most complex algae

cell walls are composed of cellulose and alginic acid

food reserves contain sugar,higher alcohol and other complex forms of pollysaccharides

kelps are the only algae with significant interal differentiation

phaeophyta can reproduce by asexual and sexual means

Higher phaeophyta have a lifecycle consisting of haploid and diploid stages, also referred to as an alternation of generation Class Phaeophyta Brown Algae

•Its importance to the aquatic ecosystem.


The Brown Algae play the ecological roles of a decomposer, producer and a food source for aquatic life.

They play an important role in marine environments, both as food and for the habitats they form. For instance Macrocystis, a kelp of the order Laminariales, may reach 60 m in length, and forms prominent underwater forests. Another example is Sargassum, which creates unique habitats in the tropical waters of the Sargasso Sea. Many brown algae, such as members of the order Fucales, commonly grow along rocky seashores. Some members of the class are used as food for humans. habitat Found all over the world

almost all are marine organisms and prefer cold water (because it holds high carbon dioxide levels used in photosynthesis)

however some prefer tropical and subtropical climates

They are found mostly right of the coast of almost every country

They are an important part of the marine flora as they provide food, shelter, spawning areas, and a substrate for numerous marine animals. Importance Natural & Human uses Brown algae are eaten by herbivorous organisms such as fish, gastropods and sea urchins.

Benthic (bottom-dwelling) organisms also utilize brown algae such as kelp when pieces of it sink to the sea floor to decompose.

Brown algae are used to produced alginates, which are used as food additives and in industry.
Common uses include food thickeners, stabilizers and fillers. Amazingly algae is being tested as a bio-fuel and as a bio-diesel by extracting oil from the algae ? Z end
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