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Download All living things need energy
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Energy and Ecology All living things need energy • For work – Chemical reactions – Transport materials into/out of cells – Mechanical (muscle contraction) This energy is found in / stored in molecules Organisms also need nutrients • Carbon and other essential elements (nitrogen and phosphate for example) to build their own biomolecules How do they get this energy and these nutrients? Other organisms Heterotrophs Nonliving sources Autotrophs Photosynthetic use energy in light to make these molecules Chemosynthetic use energy from inorganic chemicals to make these molecules Fig. 1-2 Sunlight Ecosystem Cycling of chemical nutrients Producers (such as plants) Heat Chemical energy Consumers (such as animals) Heat What happens to the organisms after they die? Decomposers primarily fungi and bacteria Decomposers (detrivores) are not typically included in a food web. What are these? Pyramid of Energy only about 10% of energy in a trophic level will become energy found in the next level Ecosystem • What is it? • How does it fit with all the other levels of organization of living things? Biosphere Biosphere Ecosystem Florida coast Community All organisms on the Florida coast Population Group of brown pelicans Organism Brown pelican Spinal cord Nerve Organ system Nervous system Brain Organ Brain Tissue Nervous tissue Cell Nerve cell Atom Nucleus Organelle Nucleus Molecule DNA Fig. 1-1a Biosphere Ecosystem Florida coast Community All organisms on the Florida coast Population Group of brown pelicans Organism Brown pelican Fig. 1-1b Organism Brown pelican Spinal cord Nerve Organ system Nervous system Brain Organ Brain Tissue Nervous tissue Atom Cell Nerve cell Nucleus Organelle Nucleus Molecule DNA What do you think will happen to a population of organisms if given unlimited resources? • What if there is a limited amount of food? • nutrients? • Available shelter?
