Breeding Seabird Assemblage
  1. Of the components of the seabird assemblage, kittiwake was the only species for which a potential LSE2 was identified. An assessment of the impact on kittiwake is provided above.
  2. If Berwick Bank Offshore Wind Farm is excluded it was found there will be an adverse impact to kittiwake. Whilst there might be a negative effect on the kittiwake population, the magnitude of that effect is small. It is not considered a sufficiently large affect that it could be said to adversely affect the probability of kittiwake being maintained as a viable component of the seabird assemblage. Furthermore, as kittiwake is the only species being significantly impacted, it could not be said to adversely affect the probability of the total seabird assemblage being maintained.
  3. However, if Berwick Bank Offshore Wind Farm is included, then it is likely that the kittiwake population will decline more significantly. Kittiwake were a significant portion of the assemblage at designation, consisting 21,170 pairs. As of the Seabirds Count census, this had declined to 5,150 pairs (Burnell et al., 2023). It is concluded that the magnitude of decline if Berwick Bank Offshore Wind Farm is included is sufficient that it could adversely affect kittiwake being maintained as a viable component of the assemblage. It is also concluded that it could negatively affect the total size of the breeding seabird assemblage population.  
  4. Therefore, it is concluded, beyond reasonable scientific doubt, that there is no AEOI to the seabird assemblage feature of the St Abb’s Head to Fast Castle SPA if Berwick Bank Offshore Wind Farm is excluded, but there is a potential AEOI to the seabird assemblage feature of the St Abb’s Head to Fast Castle SPA from the in-combination displacement impact of the Array and other developments including Berwick Bank Offshore Wind Farm.
  5. However, it should be noted that Berwick Bank Offshore Wind Farm identified an AEOI ‘alone’ for the kittiwake feature of the St Abb’s Head to Fast Castle SPA (SSE Renewables, 2022). Therefore, should Berwick Bank Offshore Wind Farm proceed, then its impact on the kittiwake feature of the St Abb’s Head to Fast Castle SPA will be fully mitigated and should not be included in the Array ‘in-combination’ assessment.
  6. On this basis, it is appropriate to not include Berwick Bank Offshore Wind Farm in the in-combination assessment for this particular site and feature, in which case there is no AEOI alone or in-combination for the seabird assemblage feature of the St Abb’s Head to Fast Castle SPA.
                        St Kilda SPA
Gannet
  1. The combined mortality from displacement and collision (using a simple additive approach of the values in Table 5.111   Open ▸ and Table 5.153   Open ▸ ) is presented in Table 5.182   Open ▸ . The approach sums the collision and disturbance impacts, with potential for double counting inherent in that approach.

 

Table 5.182:
Gannet Combined Displacement and Collision Mortalities Apportioned to the St Kilda SPA In-Combination Totals

Table 5.182: Gannet Combined Displacement and Collision Mortalities Apportioned to the St Kilda SPA In-Combination Totals

 

  1. With a population of 120,580 breeding adults (Burnell et al., 2023), 2.8 to 4.9 additional mortalities represents a 0.002 to 0.004 percentage point increase in mortality rates. Therefore, it can be concluded, beyond reasonable scientific doubt, that there is no risk of an AEOI to the gannet feature of St Kilda SPA resulting from combined displacement and collision impacts from the Array in-combination with other developments.

                        Breeding Seabird Assemblage

  1. Of the components of the seabird assemblage, gannet was the only species for which a potential LSE2 was identified for combined displacement and collision. As detailed above, there is expected to be no AEOI on the gannet feature. Therefore, it can also be concluded, beyond reasonable scientific doubt, that there is no AEOI to the seabird assemblage feature of the St Kilda SPA as a result of combined displacement and collision from the Array in combination with other developments.
                        Troup, Pennan and Lion’s Head SPA
Kittiwake
  1. The combined mortality from displacement and collision (using a simple additive approach of the values in Table 5.113   Open ▸ and Table 5.155   Open ▸ ) is presented in Table 5.183   Open ▸ . The approach sums the collision and disturbance impacts, with potential for double counting inherent in that approach.

 

Table 5.183:
Kittiwake Combined Displacement and Collision Mortalities Apportioned to the Troup, Pennan and Lion’s Head SPA In-Combination Totals

Table 5.183: Kittiwake Combined Displacement and Collision Mortalities Apportioned to the Troup, Pennan and Lion’s Head SPA In-Combination Totals

 

  1. With a population of 21,232 breeding adults (Burnell et al., 2023), 68.1 to 112.3 additional mortalities represents a 0.321 to 0.529 percentage point increase in mortality rates. Therefore, PVA has been carried out both with and without Berwick Bank Offshore Wind Farm and for the high and low scenarios, to further assess the total in-combination impact.
  2. The PVA results are summarised in Table 5.184   Open ▸ . Full details are available in appendix 3B.

 

Table 5.184:
Summary of PVA Results for In-Combination Displacement and Collision Impacts on Kittiwake at the Troup, Pennan and Lion’s Head SPA

Table 5.184: Summary of PVA Results for In-Combination Displacement and Collision Impacts on Kittiwake at the Troup, Pennan and Lion’s Head SPA

 

  1. The kittiwake population of the Troup, Pennan and Lion’s Head SPA has decreased between its citation level of 63,200 breeding adults to recent counts of 21,232 breeding adults (Burnell et al., 2023).
  2. The median CGR is 0.994 to 0.996 which indicates the population growth rate declines by 0.4% to 0.6% compared to the counterfactual. After 35 years (the expected lifespan of the Array), the CPS ranges from 0.798 to 0.872. Whilst this level of impact is small, it is not negligible and in the context of a population that is already declining, the additional mortality from the Array in combination with other projects and plans would appear to have the potential to adversely affect the likelihood of the site meeting its conservation objectives for all assessment scenarios and both with and without Berwick Bank Offshore Wind Farm.
  3. Therefore, it is concluded that there is a potential AEOI to the kittiwake feature of the Troup, Pennan and Lion’s Head SPA as a result of displacement and collision impacts from the Array in-combination with other developments.

                        Breeding Seabird Assemblage

  1. Of the components of the seabird assemblage, kittiwake was the only species for which a potential LSE2 was identified for combined displacement and collision risk. As detailed above, there is expected to be a significant impact on the kittiwake population. The kittiwake population at citation was significantly higher than the current population (Burnell et al., 2023). Whilst the magnitude of the impact would not be deemed sufficient to risk entirely losing kittiwake as a viable component of the assemblage, the decline is sufficient to adversely affect the total population size of the overall assemblage.
  2. Therefore, it is concluded that there is a potential AEOI to the seabird assemblage feature of the Troup, Pennan and Lion’s Head SPA as a result of the impact of combined displacement and collision from the Array in-combination with other developments.

                        Conclusion

  1. It is concluded that the Array area in-combination with other plans and projects would have an adverse effects on certain qualifying features for several sites, as a result of the combined impact of collision risk and displacement during the operation and maintenance phase, which could therefore undermine the conservation objectives of the SPAs listed in Table 518. An assessment of the impact of collision risk and displacement against each relevant conservation objective is presented in Table 518, where the justifications and supporting evidence are the same for more than one conservation objective, the assessments have been grouped.

Table 5.185:
Conclusions Against the Conservation Objectives of SPAs for In-Combination Combined Displacement and Collision During the Operation and Maintenance Phase

Table 5.185: Conclusions Against the Conservation Objectives of SPAs for In-Combination Combined Displacement and Collision During the Operation and Maintenance Phase

 

  1. As detailed in Table 5.185   Open ▸ , adverse effects on the qualifying seabird features of seven SPAs were identified. This is the result of impacts which would undermine the conservation objective to maintain or restore the populations of the features of the SPA as a result of in-combination combined collision and displacement during operation and maintenance phase activities.
  2. There is risk therefore of undermining the following Conservation Objectives of the sites:
  • Maintain the long term population of the species as a viable component of the site: Given the level of impact arising from collision and disturbance and displacement from the Array area, there is potential for the Array to influence the population of designated features as viable components of:

-        Buchan Ness to Collieston Coast SPA (seabird assemblage with regards to kittiwake);

-        East Caithness Cliffs SPA (kittiwake and seabird assemblage with regards to kittiwake);

-        Flamborough and Filey Coast SPA (gannet, kittiwake and seabird assemblage with regards to gannet and kittiwake);

-        Forth Islands SPA (gannet and seabird assemblage with regards to gannet and kittiwake);

-        Fowlsheugh SPA (kittiwake and seabird assemblage with regards to kittiwake and razorbill);

-        North Caithness Cliffs SPA (seabird assemblage with regards to kittiwake); and

-        Troup, Pennan and Lion’s Heads SPA (kittiwake and seabird assemblage with regards to kittiwake).

  • Maintain the long term distribution of the species within site and avoid significant disturbance of the species: Given the level of impact arising from collision and disturbance and displacement from the Array area, there is potential for the Array to disturb the distribution of features within the following SPAs:

-        Buchan Ness to Collieston Coast SPA (seabird assemblage with regards to kittiwake);

-        East Caithness Cliffs SPA (kittiwake and seabird assemblage with regards to kittiwake);

-        Flamborough and Filey Coast SPA (gannet, kittiwake and seabird assemblage with regards to gannet and kittiwake);

-        Forth Islands SPA (gannet and seabird assemblage with regards to gannet and kittiwake);

-        Fowlsheugh SPA (kittiwake and seabird assemblage with regards to kittiwake and razorbill);

-        North Caithness Cliffs SPA (seabird assemblage with regards to kittiwake); and

-        Troup, Pennan and Lion’s Heads SPA (kittiwake and seabird assemblage with regards to kittiwake).

  1. For all sites considered, there is no risk to undermining the following Conservation Objectives:
  • Maintain the long term distribution and extent of habitats supporting the species: As the Array and associated ZoI falls outside the SPA boundary, there is no potential for the Array to impact on the distribution and extent of habitats within the SPA; and
  • Maintain the long term structure, function and supporting processes of habitats supporting the species: As the Array and associated ZoI falls outside the SPA boundary, there is no potential for the Array to influence the structure, function and supporting processes of habitats supporting the species.