12.7.2.2 Grey seal 537. All of the plan and projects summarised in Table 12.19 have the potential to have indirect effects on grey seal through changes in prey species, many as an indirect result of underwater noise.
12.7.2.2.1 Sensitivity
538. As previously discussed grey seal are assessed as having low sensitivity to changes in prey availability.
12.7.2.2.2Magnitude
539. It is not possible to make a quantified assessment of the potential magnitude of temporary effect. However, it is possible that between 1% and 5% of the reference population could be exposed to this type of impact; a low magnitude of effect.
12.7.2.2.3Impact significance
540. Based on the sensitivity of grey seal and the magnitude of effect the cumulative impact is assessed as having the potential to beminor adverse.
541. However, East Anglia THREE is only making a small contribution to this cumulative impact due to the very low densities of grey seal in the East Anglia THREE site and offshore cable corridor.
542. The confidence in this assessment is low due to the large amount of uncertainty in quantifying the potential magnitude of effect from the plans and projects included in the assessment. However, confidence that the assessment is precautionary in nature is high.
12.7.2.3 Harbour porpoise 543. All of the plans and projects summarised in Table 12.19 for harbour porpoise have the potential to have indirect effects through changes in prey species, many as an indirect result of underwater noise.
12.7.2.3.1 Sensitivity
544. As previously discussed harbour porpoise are assessed as having medium sensitivity to changes in prey availability.
12.7.2.3.2 Magnitude 545. It is not possible to make a quantified assessment of the potential magnitude of this temporary effect. However, it is possible that between 5% and 10% of the reference population could be exposed to this type of impact; a medium magnitude of effect.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 12 Marine Mammal Ecology Page 118
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