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RNR 2031 Exam 1 Questions With Complete Solutions
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RNR 2031 Exam 1 Questions With Complete Solutions
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RNR 2031 Exam 1 Questions With Complete Solutions· Allee effects Correct Answer o An Allee effect describes a
situation where populations decline at low density
§ Mate selection
§ Group vigilance/defense
§ Group foraging
§ Minimum colony size
Genetic effects
· Density dependence Correct Answer o Usually seen as a
linear, inverse relationship between population growth rate and
population density (population growth decreases as density
increases) and may occur if individuals compete or predators are
more effective as a prey population increases. (Science Direct).
· The North American Model (7 tenants) Correct Answer o
Wildlife as a public trust resource
o Elimination of markets for game
o Allocation of wildlife by law
o Kill for only legitimate purposes.
o Wildlife as an international resource
o Science-based wildlife policy
o Democracy of hunting
· Verhulst's equation Correct Answer Logistic growth equation
A discrete population follows the logistic growth equation and
provides r(0.02), N0(680), and K(800). How do you estimate the
population one time step into the future? Correct Answer Use
logistic growth equation dN/dt=rN(1-(N/K)). 0.02 x 680 (1-
, (680/800))= triangle N= 2.04 + 680 is 682 (Never decimals with
animals). Population one timestep in future is 682
A population is growing provided r (0.12) and k (3,600). At
what population size is harvest maximized? What is the annual
maximum sustained yield at that population? Correct Answer
First use k/2=3,600/2= Pop size 1,800 harvest max. Then
MSY=rk/4= (0.12)(3,600)/4= annual MSY is 108
Calculating harvest and equilibrium populations Correct
Answer If it has MSY and recommended harvest %. Use
logistic equation and sub N with MSY at k/2. Do answer x
0.percent. Use that answer as dN/Dt and solve for N. For
example to solve last step of 28 = .15 x N (1-N/1000) do the
math, solver, put in Equation .00015x^2 -.15x + 28 in E1 and 0
in E2. Do same thing as last time. The first number is how many
animals can be sustainably harvested, second is the stable
consistent population
Calculating harvest and equilibrium populations Correct
Answer Plug SY in for dN/Dt of logistic equation and solve for
N. In calc do math, numeric solver. For 26.25 = .24 x N (1 -
N/1000) you would type in .00024x^2 -.24x + 26.25 in E1 and 0
in E2. For X put a number you maybe think and ALPHA enter.
That is your first number. Then replace x with higher number
and repeat. That is your second number
Challenges to the North American Model: Correct Answer ·
Poaching, enforcement (esp in diff countries), barriers,
democracy of hunting
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