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Fact or Fiction: Mosses and lichens grow on the north side of trees.

This study was to determine if moss and lichens be used as directional indicators.
by

Jessica Hornberger

on 21 April 2011

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Transcript of Fact or Fiction: Mosses and lichens grow on the north side of trees.

Fact or Fiction: Mosses and Lichens grow more on north side than on the south side. Methods We used a sample size of nine trees located at Theta Pond at Oklahoma State University. Only trees on the north side of the pond were selected
A section from each tree on the north and south side was sprayed with water to allow us to see the mosses and lichens more clearly
Using a number scale we determined if the moss and lichen growth on each tree 1.) had no growth 2.) little growth or 3.) substantial growh
The numbers were compiled and a T-test was conducted to compare the means of growth on the north and south sides Null hypothesis: there is no mean difference of moss and lichen growth on north and south sides Alternative hypothesis: there will be a mean difference of moss and lichen abundance on north and south sides of trees Results Our T-calc value was 3.28 and our T-crit value was 2.12.
Therefore, we were able to reject our null hypothesis. There is a mean difference of moss and lichen abundance on north and south sides favoring the north side. Discussion measuring trees in an artificial environment and very manicured
distance from water
tree type could affect growth on tree ex. Bald Cyprus vs Oak
Bark Type
Hemisphere Conclusion The mean growth was different from north and south
However, growth varies by tree
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