Ecology Megan Rieden
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| what is ecology | scientific study of interactions among organisms and between organisms and their environment
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| biospehere | part of the earth in which life exists including land, water, and air or atmosphere
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| species | a group of similar oragnisms that can breed prdouce fertile offspring
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| population | a group of individuals of the same area
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| community | assemblage of diffrent populations that live together in a definded area
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| ecosystem | collection of all the oranisms that libe in a particular place , together with their nonliving envierment
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| autotroph | organism that can capture energy from sunlight or chemicals and use it to produce its own food from inorganic compounds
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| heterotroph | organism that obtain energy from the foods it comsumes, also called the consumer`
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| food web | a network of complex interactions formed by the feeding relationships among the various organisms in an ecosystem
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| trophic level | step in food chain or web
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| biomass | total amount of living tissue within a given trophic level
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| biogeochemical cycle | process in which elements, chemical compunds, and other forms of matter are passed form one another
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| limiting nutrient | sunlge nutrient that either is scarce or cycles very slowly, limiting the growth of organisms in an ecosystem
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| weather | condition of Earth's atompshere at a particular time and place
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| climate | average year-after-year conditions of a temperature and precipitaion in a particular region
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| green house effect | natural situation in which heat is retained in Earth's atomosphere by carbon dioxide, methane, water vapor, and other gasses
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| biotic factor | biological influence on organisms within an ecosystem
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| abiotic factor | physical or nonliving factor that shapes an ecosystem
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| niche | full range of physical and biological conditions in which an organism lives and the way in which the organism uses the conditions
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| logistic growth | growth pattern in which a population's growth rate slows or stops following a period of exponetial growth
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| carrying capacity | largeest number of individuals of a population
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| demography | scientific study of human populations
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| demography transistion | change in the populations from high birth and death rates to low death rates
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| green revoltion | the development of a highly productive crop strains and the use of modern agricultural techquies to increase yields of food crops
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| renewable resource | a source that can regenerate quickly and that is replacable
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| pollutant | harmful material that can eneter the biosphere through the land, air , or water
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| biodiversity | the sum of the total of the variety of oraganisms in the biosphere
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| biological magnification | increasing concentration of a harmful substance in organisms at a higher trophic levels in the food chain
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