 Deer Population Activity  Each year, some deer have offspring and other deer will die.  You can use this equation to determine the size of population.

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Presentation transcript:

 Deer Population Activity  Each year, some deer have offspring and other deer will die.  You can use this equation to determine the size of population each year:  y= ((p + b)-d)  y= the total population size plus the birth rate and minus the death rate.  p= population size at beginning of the year  b= the birth rate  d= the death rate

 The birth rate and death rate will be given for each year.  You will find the population size for each year using the equation and given information.  When graphing the information, x = the year and y= population size to give you the ( x, y ) coordinates.  The population size for the next year will be the y of the previous year.

YearPop size 1stOffspringDeathsy= ((p + b) –d)Population size end y= (( ) – 300) y= (( ) – 50) y= (( ) – 150) y= (( ) – 100) y= (( ) – 100) y= (( ) – 200) y= (( ) – 250) y= (( ) – 300) y= (( ) – 250) y= (( ) – 250) y= (( ) – 450) y= (( ) – 100) y= (( ) – 150) y= (( ) – 300) y= (( ) – 100)2600

 When forming your graph, the year, or x value goes across the bottom, which is the x-axis.  The deer population size goes up the side of the graph, or the y-axis.  Number the x-axis starting with the earliest year to the latest year.  The example on the previous slide goes from 1985 to 2005 because I was not able to reformat the graph.  The y-axis should be numbered evenly to the highest number needed for the graph.  The example on the previous slide is numbered from 0 to 3000.

 The graph shows that the population size steadily rose from 1986 to  There was a large decline in population size between 1995 and  Discuss other trends you see in the graph.

Assessment Questions:  What could cause the population decline that occurred between 1995 and 1996?  Based on what you have learned about carrying capacity, what is the carrying capacity of this deer habitat?  Predict what will happen to the population size in  What circumstances might result in a high birth rate for a population? A low birth rate?  What circumstances might result a high death rate for a population? A low death rate?