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Transcript of Phaeophyta
Inhabit the intertidal and subtidal zones of coastal waters
Photosynthesis with chlorophyll a and c Structures and Functions General Characteristics Largest and most complex of all the algae
All are multicellular
Approx. 1,500 species
Mostly found in marine ecosystems
Most of the commonly called seaweeds are species of brown algae Reproduction Ecology Species Ecklonia radiata - the largest group of brown algae and also the most important. The holdfasts provide a safe habitat for a range of animals, such as worms, crabs, bivalves and sponges, which live amongst the thick cords of the holdfast. They are used as filters and stabilizers in products such as ice cream and toothpaste. Brown Algae Phaeophyta Blade - the leaf like structure that contains photosynthetic pigments
Contains chlorophyll a and c
Contain brown accessory pigment called fucoxanthin
Float - a bubble containing buoyant gases that pull the blades to the surface of the water to obtain more sunlight.
Stipe - the stem structure that the blades grow off of and can be very large.
Holdfast - holds the entire algae to the sea floor or rocks that it may be attached to. Vegetative reproduction occurs in some examples by fragmentation.
Asexual reproduction involves the formation of motile zoospores and non-motile spores such as monospores and tetraspores.
Sexual reproduction may be isogamy or anisogamy or oogamy. Fertilization is external. The zygote develops into a diploid thallus.
There is no zygotic meiosis. Species http://w3.shorecrest.org/~Lisa_Peck/MarineBio/syllabus/ch6producers/producerwp/ian/majex.html
Campbell, N. A. (1996). Biology . California : The Benjamin/Cummings Publishing Company Inc. .
Moore, R., Clark, D., & Vodopich, D. (1999). Botany. Singapore: McGraw-Hill Book Co . Sources Macrocystis or giant kelp contains algin in its cell walls which is used in cosmetics, some drugs, ice cream, etc.
They are used as food for herbivorous fish and shellfish.
One animal that especially likes brown algae is the sea urchin
Kelp also provides a home for sea otters and starfish which eat the many urchins and create a more balanced ecosystem in that area.
They are used as an additive in many foods but also can be eaten.
They can add flavor, color, and texture to soups, casseroles and many other dishes.
The seaweed can also be used for sushi. Ectocarpus _ This is found growing attached to larger algae as an epiphyte. It has similar-looking gametophyte and sporophyte plants.
The simplest of the Brown Algae is the filamentous thallus known as Ectocarpus.
Fucus - Fucus, or rockweed is an organism which gives these communities, dominated by the sub-tidal and inter-tidal members of the order Fucales, their name.
These are called rockweeds because they attach themselves to rocks to withstand harsh waves from storms.