Table 5. Effect of reductions in numbers of taxa on the AZTI Marine Biotic Index (AMBI).

Percentage of species with ecological group assignments included in theAMBI-P	No of species with ecological group assignments included in the AMBI-P	AMBI-P vs. AMBI Pearson Correlation Coefficient	No. of stations with AMBI-P values
10	65	0.49	493
20	129	0.65	493
30	193	0.66	493
40	257	0.75	493
50	321	0.76	493
60	385	0.76	493
70	449	0.80	492
80	513	0.81	493
90	577	0.81	493
100	641	0.81	493