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Symbiotic Relationships - Lichens

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Symbiotic Relationships - Lichens - Page Text Content

FC: Lichens Laura Salazar Sylvia Pascual

1: Lichens are symbiotic associations between a fungus and photosynthetic organism | The photosynthetic organism is either a green alga or a cyanobacterium, or both.

2: Lichens are extremely resistant to drought and cold | They can grow on dry rocks in the deserts and on top of mountains

3: They can survive on this environments because of the relationship between the two partner organism

4: The algae carry out photosynthesis, providing the fungus with a source of energy

5: The fungus, in turn, provides the algae or bacteria with waters and minerals that it collects and protects the green cells from intense sunlights

6: Lichens are often the first organisms to enter barren environments gradually breaking down the rocks on which they grow

7: In this way, they help in the early stages of soil formation | They are remarkably sensitive to air pollution, and are among the organisms to be affected when air quickly deteriorates

8: Some diseases caused by lichens are: the lichen planus which is a disease that affects the skin, tongue and oral mucosa

9: Other disease is the Lichen Sclerosus which is a skin condition that mainly affects the vulva in women and the penis in men. Symptoms include itch, soreness, and changes in the appearance of affected skin

10: Lichens are a mutualistic relationship between a fungus and an alga or a cyanobaterium, or both. The protective upper surface of a lichen is composed of fungal hyphae. Below this is a layer of cyanobacteria or algae with loosely woven hyphae. The third layer consists of loosely packed hyphae. The bottom layer is a protective surface covered by small projections that attach the lichen to a rock or tree

12: http://www.youtube.com/watch?v=cc3acKwglv0&feature=related A Lichen Video

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  • By: Laura S.
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  • Title: Symbiotic Relationships - Lichens
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  • Published: about 6 years ago