Helper Response to Experimentally Manipulated Predation Risk in the Cooperatively Breeding Cichlid Neolamprologus pulcher
Figure 2
Focal subordinate feeding rate was closely related to spacing behaviour.
Intake rate increased with average distance moved from protective shelter in both (A) large helpers and (B) medium helpers. Depicted are hyperbolic curve fits (distance/[a+b x distance]) from non-linear regressions for large helpers (n = 126, coefficients ± s.e.): a = 1.1572±0.2642, b = 0.0257±0.0064 (F2,124 = 229.7, p<0.001, R2 = 0.23); and for medium helpers (n = 125): a = 0.4575±0.0910, b = 0.0342±0.0042 (F2,123 = 226.6, p<0.001, R2 = 0.30).