PHYTOPLANKTON DIVERSITY CHLOROPHYTA:GREEN ALGAE

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					 PHYTOPLANKTON DIVERSITY
CHLOROPHYTA:GREEN ALGAE


           MARINE BOTANY
           FALL 2009
           CHARACTERISTICS

   Photosynthetic pigments are chlorophylls a
    and b.
   Chloroplasts have double-membranes.
   Thylakoids are stacked in groups of 2-6.
   Starch is the food reserve.
   Flagella are smooth.
       DIVISION CHLOROPHYTA


                                                     Charophyceae
Prasinophyceae
                                  Ulvophyceae
                  Chlorophyceae

             phytoplankton   benthic           Charales Zygnematales
                                               (benthic)
All are phytoplankton
                                       All are benthic


                                               planktonic     benthic
                  Prasinophytes

   Unicellular flagellates
   Advanced members
    have scales
   Micromonas –very
    small, marine flagellate,
    single flagellum,
    primitive with no scales.



                                Reference: Biology of Algae by Sze
                  Prasinophytes

   Pyramimonas –
    advanced, ovoid cell
    covered with many
    layers of scales. Four
    flagella.




                             Reference: Biology of Algae by Sze
                     Chlorophyceae

   Volvocaleans and
    Chlorococcaleans
   Volvocaleans-flagellated
    cells in the colony.
   Coenobium= a colony in
    which the number of cells is
    fixed during initial formation.
    biflagellate cells-periphery
    Gonidia- large cells with no
    flagella (capable of asexual
                                      Photo: Dr. Mitra’s Research group
    reproduction).
                 Chlorophyceae:
                Chlorococcaleans

   Solitary/loosely
    aggregated
   Non-flagellated
   Cells with increased
    surface area                   Chlorella
                            Picture by Dr. Mitra’s Research Group
   Reproduce by
    aplanospores (non-
    flagellated spores).


                              Pediastrum
                                Reference: Bold, 1947
Charophyceae: Zygnematales

   Desmids-
    freshwater/brackish
    water. Presence of                                               Staurastrum
    semi-cells (each cell is
    divided into two cells by
    a deep constriction).


                                                                      Cosmarium



                                Reference: Biology of Algae by Sze
       ECONOMIC IMPORTANCE

   Dunaliella – good source of beta-carotene---
    used for food coloring.
   Chlorella – “health food”—protein
    supplement and is commercially grown in
    Asia.

				
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posted:4/30/2012
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