You have been provided with some basic demographic data on a cohort of jumping mice in two prairie fragments in the upper Mid-West. In the Northern population, the site was burned several years ago and is now suffering encroachment from woody invasive plants. In the Southern population the site was recently burned and is relatively open with plenty of prairie grasses. Mice breed once a year and all individuals die by their fourth birthday. Females do not breed before their first birthday. Construct a life table of these data using the information below and calculate the net reproductive rate, intrinsic rate of increaseand generation time for each population. How do these demographic parameters differ between the two populations? Can you speculate why?
North South
Age # alive Av. # offspring Age # alive Av. # offspring
0 500 0 0 100 0
1 200 1.2 1 90 3.4
2 120 1.9 2 80 5.0
3 30 1.6 3 50 1.2
4 0 0 4 0 0
You have been provided with some basic demographic data on a cohort of jumping mice in two prairie fragments in the upper Mid-West. In the Northern population, the site was burned several years ago and is now suffering encroachment from woody invasive plants. In the Southern population the site was recently burned and is relatively open with plenty of prairie grasses. Mice breed once a year and all individuals die by their fourth birthday. Females do not breed before their first birthday. Construct a life table of these data using the information below and calculate the net reproductive rate, intrinsic rate of increaseand generation time for each population. How do these demographic parameters differ between the two populations? Can you speculate why?
North South
Age # alive Av. # offspring Age # alive Av. # offspring
0 500 0 0 100 0
1 200 1.2 1 90 3.4
2 120 1.9 2 80 5.0
3 30 1.6 3 50 1.2
4 0 0 4 0 0
