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| the larger the population gets, the faster it grows (rate increases) |
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the way population actually grows
initial growth is slow, but soon the growth will become more rapid, then growth slows down again (not decreasing), growth rate stops |
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| the nuber of organisms of a certain species that an enviroment can support |
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| keep a population from growing (keep it at carrying capacity) |
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| Density Dependant Limiting Factors |
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things that affect a population only when the population is dense
ie: limited resources, larger population=more frequently hunted, disease spreading quicker, parasitism, crowding/stress |
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| Density Independant Limiting Factors |
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things that affect a population no matter how dense the population is
weather factors, all abiotic things |
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| study of population growth characteristics |
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how fast a population grows
birth rate- death rate |
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| Age of Organisms affect population growth |
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prereproductive years
reproductive years
postreproductive years |
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| movement of individuals into a population |
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| movement of individual from a population |
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| any part of the natural enviroment used by humans for their benefit |
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a natural resource that is replaced or recycled by a natural process
ie water, carbon, nitrogen, plants, animals |
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a natural resource that is available in limited amounts and is not recycled by a natural process
ie fossil fuels, coal, oil, metal typically things that are mined |
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| anything that can be broken down naturally by decomposers, bacteria, or fungi |
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| Nonbiodegradable Material |
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Definition
| anything that cannot be broken down naturally or it takes a very long time to break it down |
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Definition
the build up of nonbiodegradble substances in an organism as the substances are passed through the food chain
a. organism stores nonbiodegradble substances in fat (the more they eat, the more is stored)
b. substances can be metals, poisons
c. effects organisms at the top of food chain most |
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pollutants and water vapor
egg/sperm/developing young of aquatic life are sensitive, effects worse higher in food chain
metals move to water supply
reduces tree growth in forests |
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| coal and oil factory acid rain |
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think of a car with the windows up on a sunny day... sunlight shines in (light energy) and is absorbed by the seats and interior (heat energy in the form of infrared radiation). Radiation and heat does not escape car.
windows= greenhouse gases acting as a heat blanket insulating the earth
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| Greenhouse Effect Cooling |
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Definition
these cool the earth by reflecting sunlight:
clouds, volcanic activity, acrosols (usually increase cloud cover) |
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human activities "thickening the blanket"
Impact: arctic warming (ice cap melting), weather changes, vegetation change, animal habitat change |
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| layer of O2 gas that blocks UV rays from entering the earth's atmosphere, made when UV radiation acts on O2 molecules, layer is always changing |
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CFCs get in the way of Uv and O2 reaction, causing the Ozone layer to have holes
with holes we have less protection from UV radiation |
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meaning "well-nourished"
can be a natural process, introduction of pollutants into water inscreases this
as nitrates and phosphates get into water (through fertilizers) plants flourish, causing an algae bloom, once the nutrients run out the algae dies, leaving lot's of food for bacteria, bacteria population increases and consumes all the oxygen, fish suffocate and water becomes dead :( |
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