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Fig. 6. (A) Local fields used to measure the spreading of local contractile waves
over the sponge body. Field a represents an measurement area of 3
mm2, field b represents 2 mm2; both are not completely
filled by sponge, to record changes due to contraction; distance d
between a and b is 3 mm; bar, 2.5 mm. (B) Changes in the projected areas of
fields a and b during a contraction event. The maximum contraction spreads as
a wave over the sponge surface, taking 4 min to traverse the 3 mm distance, a
speed of 750 µm min-1 (=12.5 µm s-1). The
contraction used for this measurement is shown in movie S4 in supplementary
material.
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