Lecture 2 Ecology, Components of Ecosystems& Energy Flow and Utilization1. Biosphere = that portion of the planet Earth where life exists -Life Ranges from 36,000 feet below sea level to 30,000 feet above sea level-Most Life Exists in a region from 600 feet below sea level (photic zone of the ocean) to 20,000 feet above sea level (permanent snow line in tropical and subtropical regions)- Early life forms were bacteria growing in water i hih iCO2
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2. Ecosystems = functional units of nature which reflect the complex manner in which living things interact with one another and nonliving components of the environment to process energyand recycle nutrients-Scaling issue is complexE.g.Tire with water --->Bacteria ---> Mosquitoes (Small)Oceans (Larger & Complex)-Ecosystems have no definitive size limitations but rather than emphasize the interdependence between living and nonliving things. Stiling (1992) states that “any of the above examples maybe considered ecosystems so long as living and nonliving elements are present and are interacting to process energy &materials’”.