F07.204.Ecology2a - Why are communities &...

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Unformatted text preview: Why are communities & ecosystems so complex? Natural History All species require habitat An area in which a specific plant or animal naturally lives, grows and reproduces ; habitat contains adequate food, water, shelter and living space . Niche = Job Habitat = Home Robert Bateman What determines a species habitat? Every living organism has limits to the environmental conditions it can endure. Therefore, each species requires specific environmental conditions. Temperature Moisture Nutrient supply Soil and water chemistry Living space Tolerance Limits Tolerance Range Range exists due to variation in population Giant Saguaro Cactus Broad vs. Narrow Limits Tolerance Range Tolerance Range Indicator Species Locoweed Bull Thistle Indicator Species Mayfly larvae What causes Variation? Genetics - Gene Pool Quick Intermission: Cells store information in Chromosomes Human Chromosomes Chromosome Numbers Chromosomes made of DNA Deoxyribonucleic Acid DNA divided into Genes Each gene is a set of instructions Genes vary slightly between...
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This note was uploaded on 01/11/2012 for the course ENVSCI 204 taught by Professor Robviens during the Fall '07 term at Bellevue College.

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F07.204.Ecology2a - Why are communities &...

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