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22 Cards in this Set
- Front
- Back
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POPULATION |
a group of members of the same species living in an area (reproducing group) |
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COMMUNITY |
population of different species living together |
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POPULATION GROWTH |
a change in population size |
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EQUILIBRIUM |
(births + immigration) = (death + emigration) |
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POPULATION GROWTH RATE |
amount the population has changed divided by the time it had to change |
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EXPONENTIAL GROWTH |
growth at a constant rate of increase - J - shaped curve on the graph |
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POPULATION EXPLOSION |
result of exponential growth - population crash usually follows |
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LOGISTIC GROWTH |
some process slows growth so it levels off near carrying capacity - S - shaped curve |
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CARRYING CAPACITY (K) |
the maximum population of a species a habitat can support without being ruined |
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BIOTIC POTENTIAL |
number of offspring produced under ideal conditions |
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ENVIRONMENTAL RESISTANCE |
the biotic and abiotic factors that limit a population's increase |
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K-STRATEGISTS |
lower biotic potential - care for young, live in stable environment, well adapted to normal environmental fluctuations |
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R-STRATEGISTS |
produce lots of young, but leave the survival to the young |
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TYPE I SURVIVORSHIP |
low mortality in early life - most live their full life span |
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TYPE II SURVIVORSHIP |
intermediate survivorship pattern |
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TYPE III SURVIVORSHIP |
many offspring that die young |
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POPULATION DENSITY |
number of individuals per area |
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DENSITY DEPENDENT FACTOR |
takes population because it's too big (limiting resources) |
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DENSITY INDEPENDENT FACTOR |
size doesn't matter, bad things will still happen (abiotic things) |
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CRITICAL NUMBER |
minimum population base allowing the survival and recovery of a population |
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THREATENED SPECIES |
populations are declining rapidly |
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ENDANGERED SPECIES |
populations are near critical number |
