1. By: Mike Dedio, Christian Bailey, Alex Zimm, Arianna Dean
Marine Algae
By: Mike Dedio, Christian Bailey, Alex Zimm, Arianna Dean

2. Algae Basics
Algae are Eukaryotic meaning that their cells have a nucleus-classified under the kingdom of protista
They are autotrophs, producing their own food from photosynthesis
Algae and marine plants produce upwards of 70% of the oxygen for terrestrial life

3. Algae Basics Continued…
Many algae species form symbiotic relationships with other species supplying organic substances and receiving protection
Used as fertilizer, engergy source, food source, for pigments, pollution control, and medicinal purposes

4. Seaweeds
Seaweeds are multicellular algae that live in the sunlit waters of the ocean.
Ulva- A common tissue thin seaweed that contains chloroplasts.
Some marine animals eat alga for the nutrients it provides while others filter the nutrients from the water such as barnacles

5. Seaweeds

6. Reproductive Cycle of Algae
Thallus- The leafy part of seaweed.
Ulva use asexual reproduction.
Specialized cells at the end of the Thallus produce spores called sporophyte thallus which is diploids.
Spore- A repoductive cell that contains the organisms number of chromosomes.

7. Reproductive Cycle of Algae continued.
Spores have flagella that move back and forth, the spores will at some point reach the ocean floor.
They land on a suitable substrate each develop into a leafy thallus that produces gametes.
Gametes- Are reproductive cells that contqain the haploid number of chromosomes necessary for sexual reproduction.

8. Reproductive Cycle of Algae Continued
The life cycle of Ulva is composed of two separte stages or generations- the sporophyte and gametophyte gernerations
The succession of two types of generations is called alternation of generations.

9. Brown Algae Classified in the phylum Phaeophyta
Brown or olive green in color, the color results from mixtures of pigments in the cells of the algae
Mostly the green pigment chlorophyll and the yellow pigment xanthophyll, the blending of these pigments result in a brown color.

10. Brown Algae

11. Brown Algae Continued..
Provide shelter and/or nutrients for other organisms, and are used materials people find valuable.
For example, the sea palm which grows on rocks and resembles a tiny palm tree can be eaten raw or cooked.
Rockweed attaches to rocks in the intertidal zones along the Atlantic, Pacific, and Gulf coasts.
The rockweed’s holdfast, anchors the algae to rocks, it is a tough, fibrous pad of tissue, and it also prevents the algae from being dislodged from his holding from strong currents and waves for example.

12. Brown Algae Continued..
The largest seaweeds in the ocean are called kelp which falls under the category of brown algae.
Laminaria, a type of kelp, thrives in the color waters of the temperate zone, mainly concentrated of the coasts of Maine and California.
They grow rapidly from the seafloor to the surface of the water.

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Giant kelps, like the Nereocystis and Macrocystis, can reach a length of more than 60 meters.
Fish, shellfish, sea urchins, sea lions, sea otters, and sharks all live around giant kelp for food and shelter.
A chemical in algae called algin, is used in many different industries for food preparations, medicines, paints, and paper products.

14. Brown Algae Continued….
One type of brown algae that is not anchored to a substrate is the Sargassum, floats on the waters surface in places such as South Atlantic Ocean and in some seas off the coasts of Asia.

15. Red Algae Most abundant of the marine algae
Classified in phylum Rhodophyta
Found in intertidal to subtidal zone and some species at great depths of ocean
Contains red pigment phycoerythin and the blue pigment phycocyanin
These two pigments allow for photosynthesis to occur at much deeper waters to carry out photosynthesis

16. Red Algae continued
types of red algae include Coralline Algae, Irish Moss, Porphyra, and Lithothamnion

17. Coralline Algae (Corallinia)
Hard and brittle red algae with calcium carbonate in the cell walls
Found attached to rocks in lower intertidal zone
Many are epiphytic (growing on other algae and marine angiosperms) or epizoic (grow on animals)
Used as soil conditioners and in medicine

18. Irish moss (Chrondrus Crispus)
Short, bushy, spongy red algae
Found in lower intertidal and subtidal zones
Found carpeting rocks
Contains a chemical called carrageean which is used as a binding agent in ice cream, puddings, and toothpaste
Others like this contain a chemical called agar that is used to make food, medicinal products as well as a medium for growing bacteria

19. Porphyra Thin and delicate, sheetlike red algae Also called Nori
Grows in intertidal zone usually attached to rocks
Is the most commonly eaten seaweed
There are species of porphyra found world wide

20. Lithothamnion Known as encrusting stony red algae
Grows on rocks and is often found on the shells of hermit crabs
Adorns shells with a bright red color