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Figure 4.3. Relationship between epibenthic sample size (y) and percentage
change detection in East Anglia THREE and FOUR for Shannon and Simpson indices.
4.4.2 Cable Corridor
Table 4.6. Results from Power analysis for estimated epibenthic surveys on the cable corridor.
Effect Size
0.2 0.5 0.8
Cable Corridor (n = 6) Power H’ Power S 0.39 0.98 0.99
0.97 1 1
As with all previous assessments presented during this study, Table 4.6 demonstrates an effect size of 0.8 relates to a sufficiently high statistical Power. Table 4.2 establishes that this level of effect also relates to an EDPC of less than 50% for both Shannon and Simpson indices for the epibenthic cable corridor. Again this is confirmed for both indices by a plot of ESN and EDPC (Figure 4.4).