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. 2012 Feb 13;7(2):e30868. doi: 10.1371/journal.pone.0030868

Figure 2. Reduced total rest time in cave balitorids is primarily a function of reduced rest bout duration.

Figure 2

Quantification of total rest (A.) indicates that surface fish spend an average of 999.1±64.4 min per 24 hr in a rest-like state. In strong contrast to the surface dwelling form, average total rest per 24-hour period was significantly less in all four of the cave species studied (S. oedipus: 128.8±62.04 min, p<0.001; S. jaruthanini: 130.4±27.38 min, p<0.001; N. troglocataractus: 202.3±122.1 min, p<0.001; S. speisi: 161.0±72.51 min, p<0.001). (B–C.) There were no significant differences between the number of rest bouts in surface and cave balitorids (B. Day - Epigean: 4.4±1.3; S. oedipus: 14.2±5.5; S. jaruthanini: 5.4±1.5; N. troglocataractus: 43.0±32.1; S. speisi: 10.7±3.5; Night - Epigean: 4.4±1.4; S. oedipus: 17.1±8.2; S. jaruthanini: 14.0±2.8; N. troglocataractus: 22.0±12.3; S. speisi: 47.3±29.3) thought the duration of each rest bout was significantly less in all cave populations studied compared to surface (Day - Epigean: 185.8±71.7; S. oedipus: 13.2±0.9, p<0.001; S. jaruthanini: 16.8±1.8, p<0.001; N. troglocataractus: 14.4±1.4, p<0.001; S. speisi: 12.7±0.6, p<0.001; Night - Epigean: 219.8±50.7; S. oedipus: 15.2±1.3, p<0.001; S. jaruthanini: 16.7±0.7, p<0.001; N. troglocataractus: 15.4±3.1, p<0.001; S. speisi: 12.5±0.1, p<0.001). For panel A., white denotes subjective day (CT0–CT12) and black denoted subjective night (CT12–CT24). For panels B. and C., Black denotes surface, dark-shade grey denotes S. jaruthanini, mid-shade grey denotes S. spesei, light-shade grey denotes N. troglocataractus and white denotes S. oedipus. All plots represent mean ± standard error of the mean (SEM). Asterisks represent significance relative to surface fish.