Handout _ 2 Biomes

Handout _ 2 Biomes - Study Guide # 2 J.W. Via Biology 1006...

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Study Guide # 2 J.W. Via Biology 1006 General Biology Ecosystems and Biomes I. Productivity of Ecosystems Primary Productivity -Rate of food production in plants as measured by C0 2 uptake, Oxygen production, biomass, standing crop etc. Gross primary productivity is the total rate of photosynthesis, including all organic matter produced. Net primary productivity is the gross primary productivity minus the cost of respiration. Of the total amount of sunlight available, only about 1.2% is fixed into stored energy of plants. Much of the rest is used to warm the planet surface. Variation in productivity - Some ecosystems are more efficient in converting solar energy into stored energy. Most productive, is the Coral Reef/algae beds at 2,500 g/m 2 /year. For terrestrial communities, Rainforests, 2,200; Marshes at 1,850, Temperate deciduous forest, 1,200. Least productive: deserts at 90, and open oceans at 125. However because of large portion of the surface area of the planet and the productivity, the two most important ecosystems for productivity and oxygen production are the open oceans, and rainforests in that order. Factors which act to increase the productivity of ecosystems 1) Temperature (warmer is more productive) 2) Rainfall (if not excessive), 3) Nutrients 4) Biochemical pathways ( type of photosynthesis C 3 or C 4 ) II. Biomes - Terrestrial and aquatic communities which have characteristic flora (vegetation) and fauna (animal life) under a given set of climatic conditions. They typically occupy large regions of the earth. The type of biome is largely determined by 1) moisture 2) temperature 3) solar radiation 4) stability through long periods of time. Biomes are typically grouped as tropical, temperate, or polar based on their latitudes (distance from the equator) and
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This note was uploaded on 08/15/2011 for the course BIO 1005 taught by Professor Limcomb during the Spring '08 term at Virginia Tech.

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Handout _ 2 Biomes - Study Guide # 2 J.W. Via Biology 1006...

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