Exam 3 notes - 20:19 PlantDiversityII I.Bryophytes

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20:19
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Plant Diversity II I. Bryophytes Nonvascular plants (bryophytes) Life Cycle of Bryophytes o Gametophyte is dominant stage o Sporophyte is dependent on gametophyte for nutrients o Archegonium=female gamete-producing organ o Antheridium=male gamete-producing organ o Water required for ferilization (sperm need water to move) o Embryo develops within archegonium Ecology and economic importance: Bryophytes are excellent bio-indicators of sensitive ecosystems and changes  in the microenvironment pollution Occur in forests, wetlands, tundra, even Antarctica Sphagnum moss: peat deposits o Important to global carbon cycle: peatlands store an estimated 400 billion  tons of organic carbon Sphagnum bogs also preserve animal bodies o Anaerobic conditions o Acidic o Secretes compounds that reduce bacterial activity o Peat does not decay fast Two, small, poorly drained lakes lie close to each other in a northern forest. The  basins of both lakes are composed of the same geologic substratum. One lake is  surrounded by a dense Sphagnum mat; the other is not. Compared with the pond 
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This note was uploaded on 12/11/2009 for the course ACADEMICS 2 at Colorado.

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Exam 3 notes - 20:19 PlantDiversityII I.Bryophytes

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