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Fig. 1. Effect of increasing food concentrations on (A) appendage beating rate
(fA) and (B) heart rate (fH) of D.
magna (2.68±0.22 mm long) at normoxic conditions. Data are given
as means ± S.D. (N=4 except for
5.6x104 cells ml-1, where N=2). A
repeated-measures ANOVA was performed for all food levels except
5.6x104 cells ml-1. Neither the mean
fA (F=49.9, groups d.f.=6, remainder d.f.=18,
P<0.001) nor the mean fH (F=28.8,
groups d.f.=6, remainder d.f.=18, P<0.001) were the same in
animals on all seven food levels. The results of multiple comparisons among
pairs of means are shown in Table
1.