Bull Trout Population Analysis: Cottonwood Creek vs. Rattlesnake Creek - Prof. P. H. Crowl, Assignments of Biology

Download Bull Trout Population Analysis: Cottonwood Creek vs. Rattlesnake Creek - Prof. P. H. Crowl and more Assignments Biology in PDF only on Docsity! Bio 325 Recitation Homework 3 Due: October 20/21 Answers should be handwritten. Please show an example of all calculations. Idaho Fish and Game is conducting bull trout research in the Cottonwood Creek and Rattlesnake Creek drainages. The resident trout population in Cottonwood Creek, a protected drainage that is closed to fishing, is characterized by slow growth and late maturity. The population in Rattlesnake Creek, a drainage that is open to fishing, is made up of hatchery-raised fish that are characterized by fast growth and early maturity. Age-structured information (Table 1) and fecundity information (Tables 2 and 3) on bull trout in these two drainages are given below.1 Table 1. Age-structure information on bull trout in each drainage: Age (years) Cottonwood Creek Rattlesnake Creek 0 3000 8000 1 200 250 2 150 100 3 75 50 4 70 5 5 45 1 6 31 0 7 14 0 8 10 0 9 6 0 10 1 0 1) Three ways of determining patterns of survival in a population are given in your book. Which of these does Table 1 represent? This method produces what kind of life table? What assumptions are you making when you use this method to estimate patterns of survival? 1 pt. 2) Construct an age distribution for each of these populations. 1 pt. Table 2: Female offspring produced per female of a given age of the population at Cottonwood Creek (slow growth, late maturity): Age Female eggs per female trout 0 -6 0 7+ 220 Table 3: Female offspring produced per female of a given age of the population at Rattlesnake Creek (fast growth, early maturity): Age Female eggs per female trout 0 -3 0 4+ 500 3) Construct an extended life history table for each population featuring age, nx, lx, mx, lxmx, and xlxmx using the data given in tables 1-3. 1 pt. Cottonwood Creek Drainage Rattlesnake Creek Drainage Age (years) 0 1 2 3 4 5 6 7 8 9 10 4) Calculate Ro, T, and r for each population. Show your calculations! 1 pt. Cottonwood Creek: Rattlesnake Creek: Ro:_________ Ro:___________ T:__________ T:____________ r:__________ r:___________