In the exponential model, starting with 10 individuals and r= 2, what will my population size look like in 5 timesteps? О а. O b. 10,000 O c. 10 x e^10 O d. 5xe^10
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Population Growth
R and K Selection
R and K selection are concepts in ecology used to describe traits in the fluctuation of a population or population dynamics. For example, they describe the life-association traits between parent and offspring, such as quantity or number of young ones born at a time, quality of parental care, the age to maturity, and reproductive effort.
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- A population of boreal toads has a current size of 100 and time steps are measured in years. If the instantaneous rate of increase is 0.8 (toads/(toadXtime)), what will the expected population size be after two years? Note: You need to first figure out which equation to use for this problem. O 64 toads O 117 toads O 495 toads O 6400 toads No toads will be left because the instantaneous rate of increase is less than 1.0.Gotelli discusses how environmental stochasticity influences extinction, arguing that a scaling relationship between the mean and variance of population growth rate (r) determine extinction risk. What is the scaling relationship? О а. Environmental stochasticity doesn't influence extinction risk b. Extinction will occur if the variance in r is double the mean С. Extinction will occur if the variance in r is greater than the mean squared d. Extinction will occur if the variance in r is greater than the mean е. Extinction will occur if the variance in r goes to 0A population grows in discrete time according to the logistic growth equation. At time t, the population is 50 individuals. If K is 100 and r is 1.5, what is the population size at t+1 (the next timestep)? (please round to the nearest whole number) О а. 96 O b. 50 О. 81 O d. 100 е. 88 f. 120
- What is the population size after 20 timesteps assuming exponential dynamics, an initial population size of 5, and r=0.2? Round to nearest whole number. a. b. 273 С. 151 d. 1000 е. 303A population grows in discrete time according to the logistic growth equation. At time t, the population is 50 individuals. If k is 100 and r is 1.5, what is the population size after 50 generations? (please round to the nearest whole number) О а. 96 b. O c. 100 O d. 88 е. 120 f. 50A population of armadillos in Georgia has been monitored over many years. They only breed once per year and their population dynamics are modeled well by geometric growth (the equation for geometric growth is N41 = N¡ ^). The population grew by 5% every year. Therefore, A (lambda) is %3D O 1.5 O 0.1 O 1.05 0.5 0.05 O 1.1
- ) Listen If f(A) = 0.8 and f(a) = 0.2, what is the frequency of Aa if the population is at Hardy- Weinberg equilibrium? 0.2 O 0.16 0.32 O 0.64 O 0.81. If there are 500 eagles in a population in year 1, and 550 eagles in the population in year 2, what is 2? a. What equation will you use? (Hint: the goal is to caleulate 2) b. What is 2? ANSWERS:A population of armadillos in Georgia has been monitored over many years. They only breed once per year and their population dynamics are modeled well by geometric growth (the equation for geometric growth is N - N, A). The population grew by 5% every year. Therefore, A (lambda) is O 0.5 0.05 1.05 O1.1 O0.1 1.5
- A researcher decides to try to incorporate stochasticity by changing carrying capacity (K) in the logistic model over time. This would be best considered а. Noise O b. Demographic heterogeneity С. This is not stochasticity O d. Demographic stochasticity O e. Environmental stochasticity(A) G= N K-N) K (C) (B) (х-аxis) Question: Which of the following labels for x- and y- axes best fit the graph? O a. x= Birth; y= No. of individuals O b. x= Time; y= No. of individuals O C. x= Birth; y= Death d. x= Time; y= Population growth (sıxe-A)Calculate the generation time given the following population data: Ro = 0.601, r = -0.05, [xlxmx = 6.4, mx = 0.96 A. -128 B. 0.15 C. 1.60 D. 6.67 E. 10.6