2.4. Apportioning of Impacts During the Non-breeding Period

2.4.1. Apportioning for all Species except Guillemot

  1. The calculation of apportioning values for non-breeding seasons (post-breeding, non-breeding and pre-breeding) has followed the approach advised by NatureScot (2023a). For species except for guillemot, the contribution of adult birds from an individual designated site, as estimated by Furness (2015), to the relevant BDMPS population for each species/season combination is divided by the total BDMPS population. The calculated value is the proportion of the BDMPS population represented by adult birds from the designated site under consideration. It should be noted that no updates have been made to the population data presented in Furness (2015) as selectively updating specific colonies would cause inconsistencies with the original dataset. For any designated site not named in Furness (2015), the proportion of birds present in the relevant BDMPS areas in each season has been taken from the nearest named designated site.

2.4.2. Apportioning for Guillemot

  1. As set out in paragraph 6, guillemot is the only species for which NatureScot (2023a) advises an alternative approach to the use of the BDMPS approach (Furness, 2015) when determining which colony SPAs have connectivity with the Array during the non-breeding season.
  2. As the Array lies beyond the foraging range parameter values (as set out in section 2.3.1), no connectivity with colony SPAs have been identified and therefore no apportioning has been undertaken for guillemot following the NatureScot advised approach. However, Natural England in their screening responses to Ossian, advised of their expectation for the apportioning undertaken for the Array during the non-breeding season for guillemot from Flamborough and Filey Coast SPA, to be based on the BDMPS apportioning approach (Furness, 2015). Therefore, apportioning has been undertaken using the BDMPS apportioning approach as described in the previous paragraph for all other species, but presenting only the result for Flamborough and Filey SPA.

3. Results

  1. The results of the apportioning exercise are presented in sections 3.1 to 3.5 below.
  2. The proportions, weights and apportioning values in the tables in sections 3.1 to 3.5 are values that are scored out of one (i.e. 1.0000 equates to 100%, 0.1000 equates to 10% and 0.0100 equates to 1%).

3.1. Kittiwake

  1. Apportioning values in the breeding season for all colonies within foraging range of the Array is presented in Table 3.1   Open ▸ , with SPA colonies shown in Figure 3.1   Open ▸ . Apportioning values for non-SPA colonies is presented in annex A. Apportioning values for use in the post-breeding and pre-breeding seasons are presented in Table 3.2   Open ▸ .

Figure 3.1:
SPAs Included in the Apportioning Assessment for Kittiwake

Figure 3.1 SPAs Included in the Apportioning Assessment for Kittiwake

 

Table 3.1:
Apportioning Values for Kittiwake in the Breeding Season for SPAs within Foraging Range

Table 3.1: Apportioning Values for Kittiwake in the Breeding Season for SPAs within Foraging Range

 

Table 3.2:
Post-breeding and Pre-breeding Season Apportioning Values for Kittiwake

Table 3.2: Post-breeding and Pre-breeding Season Apportioning Values for Kittiwake

3.2. Guillemot

  1. Apportioning value for guillemot at Flamborough and Filey Coast SPA  in the non-breeding season is presented in Table 3.3   Open ▸ . The location of the SPA colony is shown in Figure 3.2   Open ▸ .

 

Table 3.3:
Apportioning Values for Guillemot in the Non-breeding Season for Flamborough and Filey Coast SPA

Table 3.3: Apportioning Values for Guillemot in the Non-breeding Season for Flamborough and Filey Coast SPA

Figure 3.2:
SPAs Included in the Apportioning Assessment for Guillemot

Figure 3.2 SPAs Included in the Apportioning Assessment for Guillemot

3.3. Razorbill

  1. Apportioning values in the breeding season for all colonies within foraging range of the Array is presented in Table 3.4   Open ▸ , with SPA colonies shown in Figure 3.3   Open ▸ . Apportioning values for non-SPA colonies is presented in annex A. Apportioning values for use in the post-breeding, winter and pre-breeding seasons are presented Table 3.5   Open ▸ .

Figure 3.3:
SPAs Included in the Apportioning Assessment for Razorbill

Figure 3.3 SPAs Included in the Apportioning Assessment for Razorbill

Table 3.4:
Apportioning Values for Razorbill in the Breeding Season for SPAs Within Foraging Range

Table 3.4:  Apportioning Values for Razorbill in the Breeding Season for SPAs Within Foraging Range

 

Table 3.5:
Calculation of Post-breeding, Winter, and Pre-breeding Season Apportioning Values for Razorbill

Table 3.5: Calculation of Post-breeding, Winter, and Pre-breeding Season Apportioning Values for Razorbill

3.4. Puffin

  1. Apportioning values in the breeding season, for all colonies within foraging range of the Array, is presented in Table 3.6   Open ▸ , with SPA colonies shown in Figure 3.4   Open ▸ . Apportioning values for non-SPA colonies is presented in annex A. Apportioning values were calculated for the breeding season only for puffin.

 

Table 3.6:
Apportioning Values for Puffin in the Breeding Season for SPAs Within Foraging Range

Table 3.6: Apportioning Values for Puffin in the Breeding Season for SPAs Within Foraging Range

Figure 3.4:
SPAs Included in the Apportioning Assessment for Puffin

Figure 3.4 SPAs Included in the Apportioning Assessment for Puffin