Seaweeds kingdom protista


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Brief introduction to marine algae Seaweeds

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Seaweeds kingdom protista

  1. 1. Seaweeds Kingdom Protistaby Annie Cloutier 2013 Science Department Sandwich High School
  2. 2. Marine algae is called “seaweed” There are three main groups of salt water seaweeds Brown algae Green algae Red algae copyright acloutier 2013 2
  3. 3. Structures of brown algae Thallus (pl. thalli) multicellular bodies usually flattened Holdfast Stipe Blades Bladder (float) copyright acloutier 2013 3
  4. 4. Sargassum Sea copyright acloutier 2013 4
  5. 5. Giant kelp Macrocystis pyriferaMay grow up to 300 feet  Brown pigments called fucoxanthin with chlorophyll and other pigments  Giant stalks have stem like stipes to help support them and grow towards the sunlight copyright acloutier 2013 5
  6. 6. Fucus rockweed we love to pop Separate male and female thalli are produced Both sexes may develop on the same thallus Puffy fertile areas call receptacles develop at the tips of the branches of the thallus copyright acloutier 2013 6
  7. 7. Life cycle of Fucus copyright acloutier 2013 7
  8. 8. Gametangia ….. (algae reproductive structures Within every receptacle are dotted pores (visible to the naked eye) that open into special spherical hollow chambers called conceptacles Within a conceptacle gametangia (cell structures where gametes are produced) form Eight eggs are formed in the oogonium (female gametangium) Meiosis happens (the process of two successive nuclear divisions through which segregation of genes occurs and a single diploid (2n) cell becomes four haploid (n) cells ) copyright acloutier 2013 8
  9. 9. Feathery red Polysiphonia has three types ofthallus, male , female and tetrasporophyte. Meiosis happens on the tetrasporophyte Male thallus produces spermatangium , non motile (can’t move on its own) Female thallus , has a carpogonia, which produces one egg, non motile too Ocean waters transport the two for fertilization copyright acloutier 2013 9
  10. 10. the Zygotes journey The pericarp (an urn shaped body, of the outer part of which the female gametophyte thallus) is the destination The zygote begins to divide and eventually forms clusters of carposporangia The pericarp and carposporangia combine to form the cystocarp Diploid asexual spores called carpospores are produced and released into the ocean Eventually fasten themselves to bottom rock or hull of a boat and grow into a tetrasporophyte copyright acloutier 2013 10
  11. 11. Seaweed life cycle with terms copyright acloutier 2013 11
  12. 12. Completing the life cycle of PhylumRhodophyta The terosporangium undergo meiosis They develop into four haploid tetraspores Tetraspores germinate Then develop into male gametophytes or female gametophytes copyright acloutier 2013 12
  13. 13. Super foods from seaweedsare packed with vitamins, antioxidants and minerals we need copyright acloutier 2013 13
  14. 14. Red algae Rhodophyta Sulfated polysaccharides are found in some red algae These complex carbohydrates contain sulfate Improve auto immune system functions Have been found to stimulate anti tumor agents our bodies produce copyright acloutier 2013 14
  15. 15. Green algae Chlorophyta Important part of the plankton community Free floating often The smallest eukaryotic cell known is a Chlorophyta called Micromonas Can camouflage animals Can reproduce sexually and asexually copyright acloutier 2013 15
  16. 16. Brown algae Phaeophyceae Can be olive green to brown color Many are large algae Most are marine (salt water algae) Giant kelp Fucus rockweed Sargassum seaweed belongs to brown algae copyright acloutier 2013 16
  17. 17. AGAR Agar was discovered by accident in Japan when some extracted seaweed was left outside the door of a mountain inn and froze overnight. On thawing the innkeeper discovered that the impurities were carried away and with repeated thawing and freezing —a process still used today for the most valued food agars—a quality product with the mouth feel that appeals to Japanese tastes. This is called kanten in Japan and has become so popular recently that some restaurants serve nothing but kanten in all sorts of guises for the diet-conscious young executive copyright acloutier 2013 17
  18. 18. ALGIN uses > food, paper, textiles pharmaceuticalscosmetics, industrial uses, brewing Printing paste and  Food stabilizer in ice cream, improves dye dispersal in chocolate milk, gravies, textiles jellies, frosting Thickening agent cough  Electric insulations, beauty syrups, antibiotic mask Suspension liquids  Tooth paste Cleaners  Frozen food batters Acids  Marshmallows Welding flux  Solvents Brewing creamier beers foams copyright acloutier 2013 18
  19. 19. Seaweed …walk along the beaches of Cape Cod and notice the marine plants copyright acloutier 2013 19