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Practice Population Problems
Closed population - define:
1. A bacterial culture has an intrinsic rate of increase (rc) of 12%/hour. A microbiologist has estimated the population to be 1,957 in a petri dish. How many bacteria will there be in the next hour? How long will it take for the culture to double in size (note that the units are in hours, not years)?
2. A forest ecologist is monitoring the tree population in a small woodlot. He has determined that the current population of trees is 1285. He also know that for every 100 trees, an average of 26 seeds survive to becoming a tree in ten years. He also knows that for every 100 trees, 5 will die in ten years. What would be the projection for the number of trees in the woodlot in 10 years? in 20 years?
Open population - define:
3. A population of finches on Isabella Island in the Galapagos Islands
has a current population is 1312. In 2012, 256 finches were born into
the population and 228 died. Twenty-two 22 birds flew from an adjacent
island onto Isabella and 16 left Isabella to adjacent islands. Based on
2012 data, what is the annual rate of growth for this population? What
will be the population be in 2013?
4. The population of mice in a prairie is estimated to be 476 in 2002. In an average year, 46 mice are born per 100 mice, 53 die per 100, 17 per 100 move into the the prairie from the adjacent habitat and 12 per 100 move out. What is the intrinsic rate of growth (rc), what is the annual population growth (ro), and what is the net migration rate? Is this population growing, stable or declining?
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ARCC home Joan's home Biology Department © Joan McKearnan 2007 Send comments to: joan.mckearnan@anokaramsey.edu Any views expressed on this page are strictly those of the page author or part of an educational activity and not those of Anoka-Ramsey Community College. Last revised: Wednesday, 11 April 2007
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