Algae beads are small alginate beads with green algae (Chlorella vulgaris) embedded in them. These beads can be placed in a CO2 indicator solution and photosynthesis can be monitored based on colorimetric changes of the indicator. The beads are versatile tools that can be used for everything from simple demonstrations of photosynthesis to complex experiments exploring how environmental conditions such as light levels impact photosynthesis. The basic framework presented here can easily be modified to fit in with other examples. In this workshop we used the beads to review basic experimental design principles in the context of the effect of water clarity on photosynthesis in submerged aquatic vegetation. Participants designed and conducted an experiment using algae beads and we discussed how to incorporate them into courses.
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