Exercise #1 For low-density sea otter populations in the North Pacific Ocean, the overall annual per capita birth rate (

[answerhappygod]

Exercise 1 For Low Density Sea Otter Populations In The North Pacific Ocean The Overall Annual Per Capita Birth Rate 1 (96.63 KiB) Viewed 13 times

Exercise #1 For low-density sea otter populations in the North Pacific Ocean, the overall annual per capita birth rate (b) is about 0.7, and the death rate is about 0.45. Birth rate is not density-dependent, but death rate is density dependent, such that d' = d+cN (where N = number of otters per km of coastline). If c = 0.0157, what is the carrying capacity for sea otter density in number of animals per km of coastline? Hint: Think about the relationship between b' and d' when K occurs Exercise #2 The intrinsic rate of increase (r) for northern elephant seals is about 0.19 (per annum). We will assume that population regulation is linearly density dependent. (a) If the carrying capacity of elephant seals at a recently recolonized island is 1400 adult females and the initial population size is 120, how many more years (approximately) will it take for the population to grow to K? (b) If the island population overshot carrying capacity to 2300 adult females, how many more years (approximately) will it take for the population to decline to K? Exercise #3 The carrying capacity of meadow voles fluctuates periodically roughly on a 7 year cycle. If the long-term carrying capacity of voles in a patch of meadow is 90 individuals and amplitude of fluctuations around carrying capacity is 23, project and graph the trajectory of the population over 35 years, beginning with a population size that is exactly at K. Refer to your Excel model and graph to answer the following questions. (a) Across this 40 year span, what is the minimum population size? Round to the nearest whole number. (b) Across this 40 year span, what is the maximum population size? Round to the nearest whole number. (c) Across this 40 year span, how many full cycles occur? Hint: Consider the first seven years as one cycle for your answer, even though this one looks slightly different than the rest of the cycles.