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Investigating the distribution of Pleurococcus on tree trunks Background Information: Pleurococcus is a common green algae. It has no roots but survives by receiving water, minerals from the tree trunk. Epiphytes are plants that grow on other plants but are not parasitic. Things that may effect the distribution of algae are * Light intensity * Wind direction * Temperature and moisture Algae are found clumped together to reduce the surface area exposed to the air this saves water. Preliminary work: During the previous lessons I have been looking at the distribution of algae on three trees. At each tree I looked at the distribution at 3 separate heights and measured the circumference at each height. Here is the initial investigation I did. Method * Measure the circumference of the tree * Comment on bark texture * Record algae distribution * Repeat at the different heights Results Tree Height/Cm Circumference/Cm Algae distribution/% Bark 1 60 89 30 Smooth but depleted 80 40 100 55 120 65 2 60 90 60 Quite rough, cracked + broken 80 63 100 68 120 72 3 60 112 50 Quite rough, cracked + broken 80 55 100 57 120 57 Initial Conclusion From this initial experiment I...

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