Figure 1.

Density of predators (breeding females of L. michahellis, open circles) and prey (breeding females of L. audouinii, solid circles) and prey fecundity (dashed line refers to second y-axis) of four different local populations: (a) Columbretes, (b) Alboran, (c) Chafarinas and (d) Ebro Delta. All time-series end in 2004 but they begin when all the three parameters were available, the first year being different in each local population. Prey fecundity has the same scale for the four populations, but not population density, which is different in each case.