19-ch36-populationsWES

19-ch36-populationsWES - Chapter 36 Population Dynamics...

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Chapter 36 Population Dynamics wildlife day shifts
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population ecology – study of changes in population size & factors that regulate populations over time population – group of individuals of a single species living in the same place; interbreeding density – number of individuals per unit area (or volume) dispersion – pattern of spacing among individuals clumped uniform
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Population Size immigration – add new individuals from other populations emigration – movement of individuals out of population population size is determined by: birth + immigration death + emigration demography – vital statistics of populations changing over time - birth rates & death rates
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Demography life tables – age specific summaries of survival pattern in population cohort – group of individuals of the same age; follow fate from birth to death survivorship curve – plot of proportion in cohort still alive at each age Type I curve – low death rates in early & middle life; increase in older age groups Type II curve – death rate constant for all age groups. .. Type III curve – high death rates highest for young age groups. ..
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exponential growth – geometric increase in unlimited conditions whole population multiplies by constant factor (each time interval) 2, 4, 8,16, 32, 64, etc. does exponential growth happen in nature?
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19-ch36-populationsWES - Chapter 36 Population Dynamics...

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