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Population Ecology (Biological processes influence population density,…
Population Ecology
Biological processes influence population density, dispersion, and demographics
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The dispersion of a population is the pattern of spacing among individuals within the geographic boundaries
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The best way to construct a life table is to follow the fate of a cohort, a group of individuals of the same age, from birth throughout their lifetimes until all are dead
A graphic way of representing the data in a life table is a survivorship curve, a plot of the numbers or proportion of individuals in a cohort of 1,000 individuals still alive at each age
A reproductive table is an age-specific summary of the reproductive rates in a population, constructed by measuring the reproductive outputs of cohorts from birth until death
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The exponential model describes population growth in an idealized, unlimited environment
When r = 0, there is zero population growth (ZPG)
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The size of a population that is growing exponentially increases at a constant rate, resulting in a J-shaped growth curve when the population size is plotted over time
A population with a high intrinsic rate of increase grows faster than one with a lower rate of increase
J-shaped curves are characteristic of populations that are introduced into a new or unfilled environment or whose numbers have been drastically reduced by a catastrophic event and are
rebounding.
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