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1.00_ECOLOGY_BIO 1 INTRO Ecological Levels of Organization Slides 11-16 Ecologists study environments at different levels of organization. Levels of Organization • Living things are part of a whole. – – – – – – – – – – – Biosphere Ecosystems = Biomes Communities Populations Organism Organ System Organs Tissue Cells Molecules Atoms Biosphere Ecosystem Community Population Organism (Species) Levels of Studying Ecology Biosphere: The earth’s ecosystem interacting with the physical environment as a whole to maintain a steady state system intermediate in the flow of energy between the high energy input of the sun and the thermal sink of space (merges with atmosphere, lithosphere, hydrosphere…). ↓ Biome: Large scale areas of similar vegetation and climatic characteristics. ↓ Ecosystem: Set of organisms and abiotic components connected by the exchange of matter and energy (forest, lake, coastal ocean). Or, “the smallest units that can sustain life in isolation from all but atmospheric surroundings.” ↓ Community: Interacting populations which significantly affect each other’s distributions and abundance(intertidal, hot spring, wetland). ↓ Population: Group of interacting and interbreeding organisms ↓ Cell/Organism → Organelle → Molecule → Atom