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Fig. 2. Long-term recording over more than 7 days of the changes in projected area
during contraction cycles of two specimens of T. wilhelma in the
aquarium (A) and the open glass chamber (B). Light and dark periods are
represented by white and grey backgrounds, respectively. Subcontractions,
which differ significantly from regular contractions, are marked by asterisks.
Experimental periods S1, S2 and S3 are represented by movies in the
supplementary material. S1 represents a regular contraction series, S2 shows a
series of subcontractions between regular contractions, S3 demonstrates the
reaction of the sponge on a mechanical stimulation (amphipod attack). Note the
adaptation phase in B after settling the sponge in the observation
chamber.
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