Ch11 Population Growth and Regulation2.pdf

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University College Courses
Spencer Barrett

Calculating Population Growth Ratesthe rate of geometric growth is most conveniently expressed as a ratio of a pops size in one year to its size in the preceding year or other time intervalthis ratio is represented asexpresses the factor by which a pop changes from one time interval to the nextif Nt is the size of a pop at time t then Nt1Nt is its size one time interval laternever a veof indiv thusis always ve t NtN0ex when a pop increases by 50 over one time interval theof indiv increases by a factor of 15 150initial pop of 100 indiv would grow to o N0100150150 at the end of year 1 2o N0225 at the end of 2 years 10o N05767 at the end of 10 years rt geometric growth has the equation as exponential growth NtN0e exponential growth variable r is the exponential growth rateconstant e is the base of natural logarithms 272 r geometric and exponential growth are related by e and logr eGeometric growthExponential growth r Decreasing population 01 r0 Constant population
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