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Phaeophyta ( Brown Algae )
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Classification
Characteristics
Natural & Human uses
?
Amazingly algae is being tested as a bio-fuel and as a bio-diesel by extracting oil from the algae
habitat
- 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.
- 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.
Phaeophyta (Brown Algae)
Importance
- Domain Eukaryota- Presence of membrane-bound cell organelles
- Class phaeophyceae- Brown algae have pigment fucoxanthin
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.
- Genus-fucus
- Family-fucaceae
- Phylum Heterokontophyta- Algae with cholorphyll a & c
- Kingdom Protista- simple organisms, usually microscopic.
- 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