1. In the sampling area, stake out a 1 ft by 1 ft square in the grass. 2. With your partners, count the number of individual plants in your sample. 3. Using the large tape, estimate the total area of the entire sample, and multiply out to figure out the number of individuals in the entire area. Estimating by Mark Capture method 4. Collect a bag of beans and three markers. 5. In using one marker, take a sample of 20 beans and mark them all the same way. 6. Place your marked beans back into the bag, and shake. Collect another 20 and count the number of recaptures. Record this data in your lab notebook. 7. Use the formula from the pre-lab to estimate the number of beans in the bag. 8. Repeat this process using another color and taking samples of 50 beans. 9. Repeat the process using your third color and taking samples sizes of your choice. 10. Once you have all three estimates, count the actual number of beans in the bag. Using Radio Tracking. 11. Mr. Ashton will take you outside and you will set up a grid. In the grid we will place flags representing possible locations of animals. 12. Each group will be given instruction on which area your animals is, and what they are doing. The group will need to decide on which flags to use as your markers. 13. Using a compass, take the reading of 10 flags from two locations (see handout). Record the compass bearing into a chart. 14. You will trade off the chart with another group and try to figure out the range or activity of the organism. 15. Record the location of each measurement using the data from the other group. Data Analysis 1. Compare the value your group calculated for the population of grass. How does you number compare with those of other groups. 2. Calculate the percent error of your mark capture estimate of bean population for each try compared to the actual number of beans. 3. On the grid, shade in the section you believe to be the range of your animal. Questions 1. Where all the estimates of the grass population similar. What might be done to produce a better estimate for this lab? 2. What rules can you make about how to make the best estimate for the mark capture measurement?
3. What might make using the mark capture method difficult in the field? What factors must be taken into account in using this method? 4. What uses might radio tracking have to an environmental scientist? Point break down Title, and objectives – 10 points Pre-lab Questions – 16 points (8 points each) Data from Procedure – 35 points Data Analysis – 15 points Lab Questions – 24 points (6 points each)
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