Algae have been split into four divisions based on their pigmentation These

Algae have been split into four divisions based on

This preview shows page 44 - 47 out of 72 pages.

Algae have been split into four divisions based on their pigmentation. These four divisions are: 1. Red Algae (Rhodophyta), 2. Brown Algae (Heteromontophyta) 3. Green Algae (Chlorophyta) 4. Diatomaceae (Diatoms and Phytoplanktons) Chlorophyta: A division of green algae, mostly aquatic photosynthetic eukaryotic organisms. Like the land plants (bryophytes and tracheophytes), green algae contain chlorophylls a and b , and store food as starch in their plastids. The division contains both unicellular and multicellular species. Most species live in freshwater and marine habitats. Rhodophyta: Most red algae are also multicellular, macroscopic, marine, and have sexual reproduction. Many of the coralline algae, which secrete calcium carbonate and play a major role in building coral reefs, are Rhodophyta. Red algae such as dulse (Palmaria palmata) and laver (nori/gim) are a traditional part of European and Asian cuisine and are used as food additives. Heteromontophyta Most known species, are diatoms the primary component of plankton. 44
Image of page 44
Lichens 45
Image of page 45
1. Are fungus and a photosynthetic symbiont resulting in a stable vegetative body having a specific structure. 2. The fungi, or mycobionts, are from the Ascomycota with a few from the Basidiomycota. Coral reefs 1. Algae of the Dinoflagellate phylum are often endosymbionts in the cells of marine invertebrates. 2. They accelerate host-cell metabolism by generating sugar and oxygen through photosynthesis using light and the carbon dioxide produced in the host. 3. Endosymbiont algae in the Stony Corals called zooxanthellae , and the host Stony Corals the hermatypic corals . 4. Zooxanthellae belong to the genus Symbiodinium . 5. The loss of Symbiodinium
Image of page 46
Image of page 47

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture