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Table 5.2. Migrant Seabird Annual Mortality Rates from Collision Risk Modelling for the East Anglia THREE site
Avoidance Rate
98% 99% 99.5% 5.3 Assessment of CRM Results
26. The magnitude of effect of collision mortality was assessed using the following process. Collision risk modelling for the WCS wind turbine array was carried out to produce predictions of the number of each species subject to mortality for the defined spring migration, breeding, autumn migration, and wintering seasons (biological seasons). The seasonal mortality numbers were then compared to the relevant seasonal population mortality estimates for each species on an international, national and regional scale. This was used to quantify the magnitude of effect with respect to collision risk. The first stage was the calculation of the relative change (%) in the number of birds subject to mortality (“Increase in mortality (number of individual birds) relative to current mortality (%)”). The second stage considered the sensitivity of the species being assessed combined with the magnitude of effect to estimate the impact significance level.
27. The result of this process was that it was possible to create a set of quantified criteria from which to identify the scale of the magnitude of effect. Professional judgement was used to create a five point scale assisted by the degree of concern that the Statutory Nature Conservation Bodies (SNCBs) had expressed in meetings (not necessarily related to the proposed project) about percentage changes in mortality as a