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Fig. 4. (A) Gradient of oxygen tension (mmHg) in a long (2.16 m) shallow tank. Each
data point is equidistant along the tank. The shaded area represents the area
covered by the floating plant, Pistia stratiotes. (B) Time spent
under the shelter of the floating plant, Pistia stratiotes, at the
most hypoxic end of the gradient by fish from the large and small groups of
oscars, held in either normoxic (
130 mmHg; open bars) or hypoxic (40
mmHg; hatched bars) water for 1 h prior to being placed into the experimental
set-up. There was a significant interaction between hypoxia and size (two-way
ANOVA; P<0.01), with the asterisk indicating a significant effect
of both size and hypoxia treatment (t-test: P<0.01,
N=7 fish per group). All values are means ± s.e.m.
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