ZOL 355 Lecture 19 Outline of Last Lecture 1 Adaptations to maintain water balance 2 Urea production 3 Amino acids 4 Arid environments a High temperatures b Low temperatures i Prevent freezing Outline of Current Lecture 1 Factors that influence population growth 2 Nt 1 Nt B D 3 Exponential growth a Slope b Effects on r Current Lecture 1 Factors that influence population growth a increase the population i B births ii I immigrants b Decrease the population i D death ii E emigrants c N N B I D E 2 Nt 1 Nt B D a change in population size 3 Exponential growth continuous addition of new individuals a continual births and unlimited resources b Nt Noert c Nt number of individuals at time t d No initial number of individuals e r per capita growth rate i r b d ii b per capita birth rate births individual time iii d per capital death rate deaths individual time iv r 0 deaths are greater than births f e 2 72 g Slope dN dt i rate of population growth at a specific time ii dN dt rN iii r b d iv N estimate for the population h bN B number of births in entire pop over a short interval i dN D number of death in entire pop over a short interval 4 if r increases population growth occurs more rapidly 5 if r increases dN dt increases
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