Figure 4.

Temporal changes in the abundance of demersal and pelagic marine fish from four regions in north-temperate oceans from 1978 through 2001, standardized to a value of one for 1978. The relative abundance estimates for demersal species (filled triangle) are scaled according to the left vertical axis in each panel. The relative abundance estimates for pelagic species (open triangle) are scaled according to the right vertical axis in each panel. Number of populations represented in each time-series is as follows: (a) Northeast Atlantic (demersal: N=27; pelagic: N=14); (b) Northwest Atlantic (demersal: N=23; pelagic: N=2); (c) North mid-Atlantic (demersal: N=13; pelagic: N=2); (d) Northeast Pacific (demersal: N=1; pelagic: N=5).