PopulationDispersion_Reading 2024

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Central Michigan University *

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Biology

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Apr 3, 2024

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FOUNDATIONS OF ECOLOGY POPULATION DISPERSION BIO 213 Analysis of Population Dispersion: Plant Galls and Gall MakersAssignment 1. Create a graph showing the expected and observed number of galls per quadrat. Be sure to label axes and provide a descriptive figure caption. 1 0 5 10 15 20 25 30 35 40 45 Series1 Series2 Series3 Series4 Series5 Series6 Series7 Series8 Series9 Series10 Series11 Series12 Series13 Series14 Series15 Series16 Series17 Series18 Series19 Series20 Series21 # of galls per quandrant # of quadrants 5 pts. 2. Write the null and alternative hypothesis for the chi-squared test. Null hypothesis – There is no difference in the feeding behavior of the birds on the different colored prey. Alternative hypothesis – there is a difference in the feeding behavior of the birds on the different colored prey. 2 pts. 3. Examine your Chi-squared statistic and plot of expected and observed number of galls per quadrat. 2 pts. a. Is your observed dispersion random or non-random? Dispersion random b. If non-random, is your observed dispersion clumped or uniform? 1
FOUNDATIONS OF ECOLOGY POPULATION DISPERSION BIO 213 4. Plot the relationship between goldenrod densities and gall densities in a scatterplot. Fit a best-fit line and obtain an r 2 value. Describe the relationship between goldenrod density and gall density? 6 pts Provide an ecological explanation for the patterns you presented in questions 3 and 4? The patterns are based on the population of the worms and the ecosystems and the class participated in ecosystem management by experimenting on the worms . 2 pts. Is the mean number of galls per quadrat higher in some patches than in others? How do you explain differences or similarities between patches? 3 pts. Yes, because some of the groups were closer to the forest and others were far out could cause the differences and similaries. 2
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