bioindicators and symbiosis sana bharde lichen. lichen symbiosis mutualism symbiosis mutualism: both...
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BIOINDICATORS AND SYMBIOSIS
SANA BHARDE
Lichen
Lichen Symbiosis
Mutualism symbiosis Mutualism: both organisms benefit Symbiosis: relationship between species in direct contact Lichen composes of algae & fungi living in symbiosis The lichen fungus provides its partner(s) a benefit
(protection) and gains nutrients in return through the photosynthetic organism.
a heterotrophic fungi (mycobiont) and a phothosynthetic partner (photobiont) which provides the necessary sugars for the
methabolism and releasing oxygen during the process. Photobionts are the primary producers in the lichen symbiosis.
Lichen
Algae Fungi Mutualism
Lichen
Lichens grow in the leftover spots of the natural world that are too harsh or limited for most
other organisms. They are pioneers on bare rock, desert
sand, cleared soil , dead wood, animal bones, rusty metal, and living bark. Able to shut down metabolically during periods of
unfavorable conditions, they can survive extremes of heat, cold, and
drought.
Lichens as Bioindicators
Bioindicators are living organisms thatreflect environmental health and quality. Lichens are commonly used as indicators of air pollution, especially sulfur
dioxide pollution. Pollutants in the air dissolved in atmospheric water are damaging to lichens
As a result, there are usually very few lichens around industrial cities and towns.
lichens have been used in different countries as bioindicators of high value forests for conservation and to identify important biodiversity sites
Different lichen species vary in their tolerance to pollution and therefore make very good biological indicators of levels of atmospheric pollution.
Lichens depend on atmospheric moisture : rain , fog &dew for growth
CATERGORIES
foliose(leafy) crustose (crusty)
fruticose (shrubby) leprose(powdery)
Lichens have a variety of different growth forms
Lichen Video and Reproduction
http://www.youtube.com/watch?v=g5STBs0n8Bk&feature=related
Sing Along:http://www.youtube.com/watch?
v=lWQaEI9fKZc&feature=relatedTo form a new lichen, fungal spores need to
capture new photosynthetic partners after they germinate. Some apparently steal them from other lichens. Others have the good luck to happen upon appropriate partners. In all probability, most just perish alone.
QUESTIONS
1. Lichens can be divided into groups, based on their appearance, name 4 of these different groups?
2. What is a practical use for lichens?3. How would you describe the appearance of
a foliose lichen?4. How do Lichens exhibit Mutualism?5. What do Lichens need in order to exsist?6. What is another name for powdery Lichen?
Answers
1. Foliose, crustose, fruticose and leprose.2. Lichens can be used as bioindicators3. Leafy4. The lichen fungus provides its
partner(algae) a benefit (protection) and gains nutrients in return.
5. A photosynthetic organism, fungi and a clean atmosphere.
6. leprose