EBIO 1030-002, Week 1, Notes
EBIO 1030-002, Week 1, Notes EBIO 1030-002
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This 2 page Class Notes was uploaded by Jenna Notetaker on Tuesday September 20, 2016. The Class Notes belongs to EBIO 1030-002 at University of Colorado at Boulder taught by Caitlin Kelly in Fall 2016. Since its upload, it has received 6 views. For similar materials see Biology-Human Approach 1 (Lecture) in Biology at University of Colorado at Boulder.
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Date Created: 09/20/16
EBio Week 1 Ecology the scientific study of interactions between organics and their environment (biotic and abiotic) Biotic living organisms (bio=life) Abiotic not living chemical and physical (a=not, bio=life) Global Landscape Ecosystem Community Population Organism Ecosystems organisms and environment interacting through a oneway flow of energy and a cycling of nutrients and sustained by ongoing inputs of energy and nutrients Energy flows oneway: Light Energy Primary Producers Consumers It’s a oneway energy flow because the energy cannot be recycled (heat energy is lost) Nutrients are cycled: Producers Consumers Decomposers Food Chains and Trophic Levels Trophic levels the level in the food chain Primary producers (autotrophs): kelp Obtain energy from nonliving sources (sunlight) Build organic compounds from CO an2 water Consumers (heterotrophs): dolphin Get energy and carbon from organic sources Detritivores: crabs Eat small particles of organic matter Decomposers: bacteria Feed on organic wastes and remains and break them down into inorganic building blocks Food webs multiple interconnecting food chains (both grazing and detrital) Grazing food webs Most energy stored in producers flows to herbivores, which tend to be large animals Common aquatic systems Detrital food chains Most energy stored in producers flows to decomposers and detritivores, which tend to be small Common in terrestrial ecosystems Primary production rate at which producers capture and store energy Gross primary productivity amount captured Net primary production amount used in growth Biomass pyramid dry weight of organisms at each trophic level in an ecosystem Largest tier is usually producers For some aquatic systems, pyramid inverted Energy pyramid how energy diminishes as transferred up trophic levels Always bottom heavy ~10% of energy available in next trophic level The lost 90% is metabolism, waste, heat 1% of solar energy is collected by producers Biomagnification substances become more connected as more up trophic levels Biochemical cycle an essential element moves from nonliving environmental reservoirs, into living organisms, then back to the reservoirs Water cycle moves water from the world ocean, through the atmosphere, onto land, then back into the ocean Watershed area from which all precipitation drains into a water way Groundwater soil water and water aquifers Runoff water that flows over saturated ground into streams Flowing water carries nutrients from place to place Water on Earth: saline water 97% and fresh water 3% There is very little fresh water on Earth Salt water intrusion when all the fresh the fresh water is taken from an aquifer it is replace with salt water
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