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31 Cards in this Set

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