Fig. 2: Fluctuation spectra in systems with lower predator-prey densisty.
From: Fluctuation spectra of large random dynamical systems reveal hidden structure in ecological networks
Left: stable systems with γ = 0 (purple diamonds) and γ = 1 (green circles) have similar fluctuation spectra, with a higher proportion of predator–prey interactions in the γ = 0 case associated with higher overall excitation. Right upper: near instability a pole emerges at ω = 0, corresponding to baseline drift in marginally stable systems. Right lower: In log–log axes we see the different nature of the pole for mixed (γ = 0, purple diamonds) communities compared with those with only symmetric interactions (γ = 1, green circles). For γ = −1, see Fig. 1, left panel. Common parameters are N = 1000, c = 50, σ2 = 0.5.
