Chapter 39 (2)

Chapter 39 (2) - Chapter 39 11/18/09 Ecology Ecology o The...

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Chapter 39 11/18/09 Ecology Ecology o The study of the interrelationships among living things and their nonliving environment Population o Members of a particular species within an ecosystem o Actually or potentially interacting How Does Population Size Change? Biotic potential o Maximal growth rate given ideal conditions o Produces exponential growth if not restrained Environmental resistance o Factors that limit population growth o e.g., food availability, space, access to mates, environmental factors Population growth = biotic potential – environmental resistance Exponential Growth Population change = (births – death) + (immigrants – emigrants) If we ignore migration: o Growth rate (r) = birth rate (b) – death rate (d) Exponential Growth To determine the # of individuals added to a population in a given time period, the growth rate (r) is multiplied by the current population size Population growth = rN Time Current N Population growth T = 0
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Chapter 39 (2) - Chapter 39 11/18/09 Ecology Ecology o The...

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