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24 Cards in this Set
- Front
- Back
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what are types of growth patterns
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exponential, logistic, fluctuations, regular cycle
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exponential growth occur when
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condition favorable, not forever. often in new habitat
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jump dispersal
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long distance colonize
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logistic growth approach
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equilibrium due to carrying capacity. doesnt match precisley in real life.
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carrying capacity, birh rate and death rate are
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equal
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pop fluctuation
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could be increase/decrease in overal mean value or deviation from growth pattern
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pop flucutation cou.d be due to
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prey or predator increase, temp, both density dependent and independent
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pop cycle
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alternating periods of high and low abundance occur after nearlt constant interval
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wyh does pop cycle happen
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jormonal or behavioral changes in response due to crowding, or weather food, predators
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delayed density dependence can
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cause pop to fluctuate in size
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when rt(time lag) is small
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pop exhibit logistic growth
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when rt is intermediate
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pop exhibit damped oscillations (gets closer to logistic growth)
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when rt is large
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pop exhibits a stable limit cycle
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when adult density is highq-unlimited food
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few offsprincg survive due to too much adults. more fluctuation
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when food for adult is limited
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fluctuation decreased
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when variable environmental conditions cause pop growth to fluctuate considerably
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its resk of extinction increase
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chance events ex(unpredictable events)
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genetic, environmental, demographic
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getetic factors(genetic drift
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which allels are passed to next generation
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inbreeding
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increase frequency of homozygotes-harmful alleles/less chance of successful reproduction
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pop increase and decrease dramatically
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irruption and crash
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alles effect
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wehn pop grwoth rate decrease as density also decrease due to difficulty finding mate
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demographic stochasticity
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chance events random that effect birth and death rate
random genetic factors, or the chance appearance of a predator |
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environmental stochasticity
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unpredictable cahnges in environmnet
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natural catastrohes
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make pop that is large enough to also go extinct
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