Primary productivity experiment

by

Green

Second year Marine Science students in C block chose to investigate the effect of colour of light on primary productivity in bull kelp (Nereocystis luetkeana). After wrapping five BOD bottles in each of five colours of cellophane plus five bottles in transparent cellophane and including five black bottles, students filled BOD bottles with seawater and one piece (4 cm x 4 cm) of bull kelp.

They measured dissolved oxygen in each bottle:

Kiera and Steph

then left the bottles on the window sill of the floating lab for 4 to 6 hours:

Blue red purple yellow

Green transparent

Then they measured dissolved oxygen again:

Mikelle

Sophia & Kiera

The data collected are shown below:

Data

And I have to include this photo of the wall by the stairs in the floating lab taken when students were measuring final oxygen levels:

Spectrum

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