10PopulationGrowthF10b

10PopulationGrowthF10b - BIOL 110: Population Growth...

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BIOL 110: Population Growth
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Population growth Population: Natural populations typically display two types of growth: Exponential Logistic Exponential growth : No ecosystem limits to growth
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Populations’ capacity for growth How fast the populations of a certain type of species can grow determined by: Sex ratio : Generation time : average time between birth and reproduction long generations = slower growth rates Age structure : many younger individuals in a population increases growth rates
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Exponential Growth Consider a case where we start with a single cell, and all cells can reproduce
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Exponential growth curve Clearly not linear, an exponential function N time Represents the biotic potential :
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Exponential growth formula Growth rate = change in size divided by change in time (dN/dT) Growth rate is slope of curve dN/dT = rN N = r = r = the increase in size per generation r is calculated as the difference in the birth rate and the death rate; r = b - d
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10PopulationGrowthF10b - BIOL 110: Population Growth...

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