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31 Cards in this Set
- Front
- Back
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4 rates that determine population size
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birth rate, death rate, emigration, and immigration
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abiotic limititing factors
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sunlight, soil, wind, living space, and water
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biotic limiting factors
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predators, population density, species competing for same resourses
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carrying capacity
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the greatest number of individuals a space can support
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why do few barriers prevent human dispersal
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technology has allowed human population to occupy and modigy every environment on earth and to move among them and has reduced the death rate of humans
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why is earth's carrying capacity limited
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food, water, and space
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why does uneven distribution of food limit population size
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not all people have equal access to food supply, famine
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what have humans modifiing the environment caused
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acid rain, urban smog, thinnign of ozone layer, and global warming
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what barriers prevent dispersal
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physical barriers- ecological barriers- behavioral barriers
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symbiotic relationships
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different organisms live together in close association
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symbiosis
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close nutritional relationship between 2 organisms
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commensalism
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one organism benefits and the other is not effected
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mutalism
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both organisms benefit
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parasitism
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the parasite benefits at the expense of the host
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competition
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when different species of organisms living int he same habitat use the same resources such as food, space, light, and water
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niche
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the role a species plays in its environment
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biocides
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poisons, pesticides, fingicides, herbicides, and insecticded used to control pest organisms
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biological magnification
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process of passing toxic substances through a food chain- high level of toxin in higher order consumers
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biodiversity
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number of different types of organisms that live on earth
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poor farming practices cause:
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loss of nutrients in soil, no recycling of nutrients causing soil to be less fertile, erosion and desertification occur
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what does organic waste cause
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increase in bacteria growth and oxygen consumption- kills of larger aquatic organisms
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air pollution:
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depletion of ozone layer- acid rain- smog and temperature inversion
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land pollution
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sanitary landfills, toxic landfills
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pesticides
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contaminate air and water- ddi
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importation of orgranisms
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may have no "enemies" in new environment so could spread and take over quickly
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pollution control
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unleaded gas, sewage treatment plants, conrolling landfills and dumping, storage of toxic and nuclear wastes
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pollution control
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unleaded gas, sewage treatment plants, conrolling landfills and dumping, storage of toxic and nuclear wastes
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conservation of natural resources
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recycling, using renewable resources
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soil conservation:
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cover crops- strip cropping- terracing- contour farming- windbreaks- dams- crop rotation- fertilizers
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forest conseration
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tree farming- reforestation
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wildlife conservation
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huntng and fishing laws- game and bird preserves- fitch hatcheries- restricted use of pesticides- legal protection of endangered species
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