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Fig. 3. The duration of the inflation–contraction cycle depends on the
resting diameter of the largest excurrent canals. Responses to agitation were
measured in five sponges with the same sized (diameter) choanosome, but with
varying sizes (1–5) of excurrent canals: 64.9, 76.9, 103.52, 154.13 and
213.35 µm, respectively. Sponges with larger excurrent canal diameters have
a longer inflation and contraction period (500, 899, 1399, 2988, 2052 s,
respectively), but the rate of propagation of contractions along incurrent and
excurrent canals was not significantly different (in: 2.80±0.26 µm
s–1, N=5; ex: 3.30±0.45 µm
s–1, N=5, P=0.23). Bars denote ±
s.e.m. of three measurements from one sponge (see supplementary material Fig.
S2).
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