Figure 2

Experiment 2 (hypoxia: 2.0 mg/L; severe acidification: pH 7.40). Daily per capita interaction strength (PCIS) for P. humeralis (a), I. resecata (b), S. purpuratus (c), and T. brunnea (d, note change in y axis range) measured in laboratory experiments. Data show means ± SE for all individuals across 9 rounds in Experiment 2 (n = 16 individuals species−1 treatment−1 for P. humeralis, I. resecata, and S. purpuratus; for T. brunnea, n = 14 individuals for acidification treatment, n = 15 for hypoxia treatment, n=16 for control and hypoxia + acidification treatment). More negative values indicate greater interaction strengths. Letters indicate a significant difference (p < 0.05) in PCIS under the different treatment groups based on multiple-comparison procedures.