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10PopulationGrowthF08b

10PopulationGrowthF08b - BIOL 110 Part 09 Population Growth...

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BIOL 110: Part 09, Population Growth
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Population growth Population: a group of individuals of the same species in the same place Natural populations typically display two types of growth: Exponential Logistic Exponential growth : all or a fixed proportion of individuals can reproduce No limits to population 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 : the number of births closely tied to number of females More females = faster rate of growth Generation time : 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 : the (maximal) rate of increase when no limits are placed on growth
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Exponential Growth formula Growth Rate =
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