Table 1. Scale-related aggregative power of physical processes.

Scale	Zooplankton density	Zooplankton biovolume	Fish density	Fish biomass
All structures
Mean	8.8**	152.8**	92.0*	947.0**
Median	1.1	76.9	0.5	138.3
n	5,878	3,644	4,860	4,860
cv	4.6	1.4	3.4	2.6
<1 km
Mean	6.8**	132.5**	61.6**	297.8**
Median	0.6	64.4	0.03	68.0
n	3,466	2,957	2,681	2,681
cv	5.4	1.4	3.6	2.1
1–10 km
Mean	9.7**	510.4**	111.1**	1,536.8**
Median	2.0	192.8	1.9	243.5
n	1,934	1,481	1,721	1,721
cv	4.0	1.7	3.1	2.3
>10 km
Mean	26.8**	2,262.1**	318.4**	9,946.7**
Median	2.5	647.9	8.6	799.0
n	478	386	4.58	4.58
cv	3.3	1.9	3.1	2.7

cv, coefficient of variation; n, number of physical structures.

Difference (in %) between the zooplankton and fish density and biovolume/biomass embedded within structures with the zooplankton and fish density and biovolume/biomass observed in the neighbouring zone with no significant physical structures. To test for significant differences in the relative aggregative index (RI) of the mean density, a parametric statistical setting was used where the null hypothesis assumes statistical independence between the biovolume/biomass of zooplankton and fish and the physical forcing. The distribution of the RI was estimated under the null hypothesis from 500 transect-by-transect random simulations of the ecological signals and the original physical structures. Asterisks indicate significant difference in the mean density: **<0.01, *<0.05;