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Fig. 7. Food density dependence of isthmus/TB pumping and peristalsis. When (A)
C. elegans, (B) P. pacificus, (C) Cephalobus sp.
DWF1301, or (D) Panagrolaimus sp. PS1159 animals were placed in
dilute food conditions compared to normal conditions (see Materials and
methods), isthmus/TB pumping/peristalsis rates were reduced whereas corpus
pumping rates were unchanged or increased. Asterisks indicate statistically
significant differences between dilute and normal conditions by two-tailed
t-test (**P<0.01).