PopulationDispersion_Reading 2024

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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

FOUNDATIONS OF ECOLOGY POPULATION DISPERSION BIO 213 TABLE 2: Observed frequency of galls for all goldenrod patches sampled by the class. Number galls per Quadrat Patch 1 Patch 2 Patch 3 Patch 4 Patch 5 Patch 6 Total 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Mean 3

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FOUNDATIONS OF ECOLOGY POPULATION DISPERSION BIO 213 DATA COLLECTION SHEET Section____________________ Date____________________ Names____________________________________________________________ Site: Distance from road, trees, etc._______________ Number of trees_____ Quadrat # galls # Goldenrod Quadrat # galls # Goldenrod 1 14 2 15 3 16 4 17 5 18 6 19 7 20 8 21 9 22 10 23 11 24 12 25 13 26 Total __________ Mean __________ 4

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