Topic15-EcosystemsandBiomes

Biology: A Guide to the Natural World with mybiology" (4th Edition)

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KroghS10.007 Biomes March 18, 2011 Topic 15 - Chapter 35 Ecosystems and Biomes PART 1 I. WHAT IS AN ECOSYSTEM? A. DEFINITION: Ecology is the Study of _________________________ (pp. 726-727) B. DEFINITION: Ecosystem : All living organisms, their physical environment and their interactions 1. Biotic Factors : All living organisms a. Individua l organisms b. Population : All the organisms of the same species that interact and interbreed c. Community : All the ______________ of animal and plant species in an area 2. Abiotic Factors : Non-living parts of the environment a. The physical substrate such as water, land or air b. The climate 3. Interactions: relationships between living organisms and between organisms and the abiotic environment --Interactions are the most important part of the ecoSYSTEM concept. C. Do ecosystems really exist? * Yes, in the same sense that "the economy" exists. D. Are "ecology" and "environmentalism" the same thing? No, because. .. 1. Ecology is a _______________ 2. Environmentalism is a_________________
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ENERGY IN ECOSYSTEMS A. Food Chains and Food Webs : Who eats Whom (Fig. 35.11, 35.12) B. Trophic Pyramids (also called Ecological Pyramids) (Figs. 35.15) 1. Producers or Autotrophs : Plants and Algae a. Produce their own organic food b. Use photosynthesis to convert _______________ energy into Chemical energy using Carbon Dioxide, Water and Minerals 2. Consumers or Heterotrophs - Depend on producers for food a. Primary Consumers - (herbivores ) -- eat producers b. Secondary Consumers - (carnivores and omnivores) - eat herbivores c. Higher order consumers d. Decomposers : Special consumers that consume _____________________ III. NUTRIENT CYCLES A. Most important chemical nutrients are C - carbon comes from carbon dioxide (CO 2 ) in the air H - hydrogen comes from water (H 2 O) O - oxygen comes from carbon dioxide and water N - nitrogen comes from the soil or nitrogen in the air P - phosphorus comes from minerals in rock and soil
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Topic15-EcosystemsandBiomes - KroghS10.007 Biomes March 18,...

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