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Biology 286: Introduction to Ecology and Evolution Weekly Assessment #11 You may use your notes and discuss these questions with your colleagues. Please turn in your own answers on this sheet. Each question is worth one point. 1. Explain the difference between lx and Lx. lx is age-specific survivorship; it is the proportion of an original cohort of individuals that survives to each age class. Lx = is the average number of individuals surviving from one age class to the next, (nx + nx+1)/2, and is used to calculate life expectancy 2. Below is a partial life table for a female sparrow population. Calculate bx for second-year individuals (show your work).

Age (year) 0 1 2 3 4

Number of # female female individuals offspring produced 150 0 100 25 50 100 10 5 0 0

bx = 100/50 = 2 female offspring produced per 2-yr old female 3. The population of Coho salmon in Lake Michigan fluctuates around 12 million. After fishing and mortality, the population is reduced to 5 million. The annual intrinsic rate of increase value is 0.54. a. What is the K value for this population? The carrying capacity is 12 million fish. b. How would you calculate the number of fish that are expected to be added to the population in the next year? You do not need to do the math, just show the completed formula. Use the equation for logistic (density –dependent) growth: dn/dt = 0.54 (5,000,000)(1-0.417) 4. If the Coho salmon population above is growing, what do you know about its r and R0 values? r = intrinsic rate of increase is given as 0.54. This value is greater than zero so the population is growing. R0 = net reproductive rate; it has to be greater than 1 because the population is increasing....