ecology lab 1 spatial distribution methods and results

# X 2 in 1 where n was the number of quadrants and n 1

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X 2 = I(n-1) Where n was the number of quadrants and (n-1) the degrees of freedom. This equation was used to determine the probability of if the Plantago major plants were randomly distributed or not. Results: Once the index of dispersion was calculated it was found that for all three frequency distributions graphs the ratio indicated that the Plantago major plants resided within a clumped formation. This is because the index of dispersion for 50cm by 50cm plot, 100cm by 100cm plot, and a 200cm by 200cm plot were respectively 2.70, 6.84, and 10.57 which are all greater

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than one. A ratio that is greater than 1 indicates a clumped distribution, a ratio of less than 1 indicates even dispersion, and when the ratio is equal to 1 it indicates random dispersion. A chi-squared value was then calculated for each of the above described frequency distribution graphs. The results being that of 8.07x10 -12 , 4.31x10 -15 , and 6.00x10 -7 respectively. Due to all of the chi-square values being less than 0.05 the null hypothesis that the Plantago major plants are in even distribution can be rejected. Meaning that the plotted plants can be considered aggregated. - Graphs Figure 1: This figure shows the spatial distribution within the total 16 meter plot of Plantago major. The selected size for this graph was 100cm by 100cm Both of the axis represent the length of the plot with each square representing one of the 16 quadrants.
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• Fall '12
• TA
• Standard Deviation, Orders of magnitude, Pennsylvania, Perennial plant, Plantago

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