Figure 2.

Effects of elevated-CO₂ conditions on the directional response of recently settled juvenile clownfish (17–20 days post-hatching) to acoustic playback of daytime reef noise (r.m.s. intensity = 153 dB re 1 µPa at the speaker). Sample sizes, which varied owing to mortality during rearing, are given on bars, which indicate mean ± s.e.m.; significantly different responses are indicated by letters.