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Figure 5


Fig. 5. Changes in behaviour in large and small oscar during progressive hypoxia. Where significant interactions (P<0.05) between hypoxia and size masked changes in behaviour within size classes, one-way ANOVA analyses were performed post hoc to test for statistical differences. (A) Horizontal activity, (B) vertical activity and (C) aggression. Values are means ± s.e.m. Letters denote significant differences within size groups where bars sharing the same letter are not significantly different (one-way ANOVA: P<0.05) and asterisks denote a significant difference between size groups (two-way ANOVA: P<0.001). (D) Relationship between the activity scores of individual fish at different oxygen tensions (Spearman's Rank Correlation: rs=0.667, 0.698, 0.718 for PO2=40, 80 and 136 mmHg, respectively; P<0.001).