This parameter, relating to criterion D1C2, allows the estimation of a percentage annual mean difference in relative abundance of a species, calculated over the assessment cycle (2011-2016), and an 80 % confidence interval. The results obtained for the penguin torda show that there is no decline in abundance above the 0.5% threshold, that the upper bound of the 80% confidence interval includes the value 0%, and that the mean percentage difference is centred on 0. Consequently, the parameter "relative abundance (short-term calculation)" is considered to have been achieved for this species in the Northern MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

This parameter, related to criterion D1C4, allows the estimation of a mean annual percentage difference in the proportion of area occupied by the species over the assessment cycle (2011-2016), as well as an 80% confidence interval. The results obtained for the penguin torda show that the 80% confidence interval of the mean annual percentage difference in the proportion of area occupied by the species is [-1.2% - 2.3%] for the period 2011-2016. The upper bound of the 80% confidence interval is therefore above the 0% threshold. Consequently, the "Distribution (spatial)" parameter is considered to have been reached for this species in the Northern MRU of the Bay of Biscay Marine Sub-Region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

This parameter, relating to criterion D1C2, allows the estimation of a percentage annual mean difference in relative abundance of a species, calculated over the assessment cycle (2011-2016), and an 80 % confidence interval. The results obtained for Northern Gannets show that there is no decline in abundance above the 0.5% threshold, that the upper bound of the 80% confidence interval includes the value 0%, and that the mean percent difference is centred on 0. Consequently, the parameter "relative abundance (short-term calculation)" is considered to have been reached for this species in the MRU North of the Bay of Biscay marine sub-region, and it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

This parameter, related to criterion D1C4, allows the estimation of a mean annual percentage difference in the proportion of area occupied by the species over the assessment cycle (2011-2016), as well as an 80% confidence interval. The results obtained for the Northern Gannet show that the 80% confidence interval of the mean annual percentage difference in the proportion of area occupied by the species is [-0.0% - 0.0%] for the period 2011-2016. The upper bound of the 80% confidence interval is therefore above the 0% threshold. Consequently, the "Distribution (spatial)" parameter is considered to have been reached for this species in the North MRU of the Bay of Biscay marine sub-region, and it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

The metric for this parameter is a rate of change in abundance between the reference period (calculated from the 1987-1989 censuses) and the most recent period (2010 or 2016 depending on the species). The rate of change in the abundance of breeding pairs of the Crested Cormorant is positive between 1988 and 2010 (numbers in 2010 are higher than in 1988). The parameter "Relative abundance (long-term calculation)" is therefore achieved for this species in the Northern MRU of the Bay of Biscay marine sub-region.

This parameter, relating to criterion D1C2, allows the estimation of a percentage annual mean difference in relative abundance of a species, calculated over the assessment cycle (2011-2016), and an 80 % confidence interval. The results obtained for the crested cormorant show that there is no decline in abundance above the 0.5% threshold, that the upper bound of the 80% confidence interval includes the value 0%, and that the mean percentage difference is centred on 0. Consequently, the parameter "relative abundance (short-term calculation)" is considered to have been reached for this species in the Northern MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

Based on the counting data of the breeding pairs, the parameter "Breeding success" is calculated over the period 2011-2016. The metric for this parameter corresponds to a number of years in which the annual percentage of colonies in massive reproductive failure exceeds 5 % of the colonies monitored (OSPAR method B3: https://oap.ospar.org/en/ospar-assessments/intermediate-assessment-2017/biodiversity-status/marine-birds/marine-bird-breeding-success-failure/). For the crested cormorant, the results show that the annual percentage of colonies in massive reproductive failure does not exceed 5% in any year for the period 2011-2016. The "Reproductive success" parameter is therefore achieved for this species in the Northern MRU of the Bay of Biscay marine sub-region.

This parameter, related to criterion D1C4, allows the estimation of a mean annual percentage difference in the proportion of area occupied by the species over the assessment cycle (2011-2016), as well as an 80% confidence interval. The results obtained for the Crested Cormorant show that the 80% confidence interval of the mean annual percentage difference in the proportion of area occupied by the species is [-0.5% - 0.7%] for the period 2011-2016. The upper bound of the 80% confidence interval is therefore above the 0% threshold. Consequently, the "Distribution (spatial)" parameter is considered to have been reached for this species in the Northern MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

The metric for this parameter is a rate of change in abundance between the reference period (calculated from the 1987-1989 censuses) and the most recent period (2010 or 2016 depending on the species). The rate of change in abundance of breeding pairs of the Great Cormorant is positive between 2010 and 2016 (no breeding pairs of this species before 2010). The parameter "Relative abundance (long-term calculation)" is therefore achieved for this species in the Northern MRU of the Bay of Biscay marine sub-region.

This parameter, relating to criterion D1C2, allows the estimation of a percentage annual mean difference in relative abundance of a species, calculated over the assessment cycle (2011-2016), and an 80 % confidence interval. The results obtained for the Great Cormorant show that there is no decline in abundance above the 0.5% threshold, that the upper bound of the 80% confidence interval includes the value 0%, and that the mean percentage difference is centred on 0. Consequently, the parameter "relative abundance (short-term calculation)" is considered to have been reached for this species in the Northern MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

This parameter, related to criterion D1C4, allows the estimation of a mean annual percentage difference in the proportion of area occupied by the species over the assessment cycle (2011-2016), as well as an 80% confidence interval. The results obtained for the Great Cormorant show that the 80% confidence interval of the mean annual percentage difference in the proportion of area occupied by the species is [-1.7% - 0.1%] for the period 2011-2016. The upper bound of the 80% confidence interval is therefore above the 0% threshold. Consequently, the "Distribution (spatial)" parameter is considered to have been reached for this species in the Northern MRU of the Bay of Biscay Marine Sub-Region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

This parameter, relating to criterion D1C2, allows the estimation of a percentage annual mean difference in relative abundance of a species, calculated over the assessment cycle (2011-2016), and an 80 % confidence interval. The results obtained for the common guillemot show that there is no decline in abundance above the 0.5% threshold, that the upper bound of the 80% confidence interval includes the value 0%, and that the mean percentage difference is centred on 0. Consequently, the parameter "relative abundance (short-term calculation)" is considered to have been reached for this species in the Northern MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

This parameter, related to criterion D1C4, allows the estimation of a mean annual percentage difference in the proportion of area occupied by the species over the assessment cycle (2011-2016), as well as an 80% confidence interval. The results obtained for the common guillemot show that the 80% confidence interval of the mean annual percentage difference in the proportion of area occupied by the species is [-0.5% - 1.6%] for the period 2011-2016. The upper bound of the 80% confidence interval is therefore above the 0% threshold. Consequently, the "Distribution (spatial)" parameter is considered to have been reached for this species in the Northern MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

The metric for this parameter is a rate of change in abundance between the reference period (calculated from the 1987-1989 censuses) and the most recent period (2010 or 2016 depending on the species). The rate of change in abundance of breeding pairs of northern fulmar is positive between 1988 and 2010 (the numbers in 2010 are greater than in 1988). The "Relative abundance (long-term calculation)" parameter is therefore reached for this species in the Northern MRU of the Bay of Biscay marine sub-region.

This parameter, relating to criterion D1C2, allows the estimation of a percentage annual mean difference in relative abundance of a species, calculated over the assessment cycle (2011-2016), and an 80 % confidence interval. The results obtained for northern fulmar show that there is a decline in abundance above the 0.5% threshold, although the upper bound of the 80% confidence interval includes the value 0%, and the mean percentage difference is relatively centred on 0. Consequently, the parameter "relative abundance (short-term calculation)" is considered not to have been reached for this species in the Northern MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

This parameter, related to criterion D1C4, allows the estimation of a mean annual percentage difference in the proportion of area occupied by the species over the assessment cycle (2011-2016), as well as an 80% confidence interval. The results obtained for northern fulmar show that the 80% confidence interval of the mean annual percentage difference in the proportion of area occupied by the species is [-3.8% - -0.6%] for the period 2011-2016. The upper bound of the 80% confidence interval is therefore below the 0% threshold. Consequently, the "Distribution (spatial)" parameter is considered as not being reached for this species in the Northern MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

The metric for this parameter is a rate of change in abundance between the reference period (calculated from the 1987-1989 censuses) and the most recent period (2010 or 2016 depending on the species). The rate of change in abundance of storm petrel breeding pairs is positive between 1988 and 2016 (the numbers in 2016 are greater than in 1988). The parameter "Relative abundance (long-term calculation)" is therefore achieved for this species in the MRU Nord of the Bay of Biscay marine sub-region.

This parameter, relating to criterion D1C2, allows the estimation of a percentage annual mean difference in relative abundance of a species, calculated over the assessment cycle (2011-2016), and an 80 % confidence interval. The results obtained for storm petrel show that there is no decline in abundance above the 0.5% threshold, that the upper bound of the 80% confidence interval includes the value 0%, and that the mean percentage difference is centred on 0. Consequently, the parameter "relative abundance (short-term calculation)" is considered to have been reached for this species in the Northern MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

This parameter, related to criterion D1C4, allows the estimation of a mean annual percentage difference in the proportion of area occupied by the species over the assessment cycle (2011-2016), as well as an 80% confidence interval. The results obtained for the storm petrel show that the 80% confidence interval of the mean annual percentage difference in the proportion of area occupied by the species is [-4.0% - -0.1%] for the period 2011-2016. The upper bound of the 80% confidence interval is therefore below the 0% threshold. Consequently, the "Distribution (spatial)" parameter is considered as not being reached for this species in the Northern UMR of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North UMR of the Bay of Biscay marine sub-region and the South UMR of the Bay of Biscay marine sub-region.

The metric for this parameter is a rate of change in abundance between the reference period (calculated from the 1987-1989 censuses) and the most recent period (2010 or 2016 depending on the species). The rate of change in abundance of breeding pairs of Herring Gulls is negative between 1988 and 2010 (numbers in 2010 are smaller than in 1988). The parameter "Relative abundance (long-term calculation)" is therefore not reached for this species.

This parameter, relating to criterion D1C2, allows the estimation of a percentage annual mean difference in relative abundance of a species, calculated over the assessment cycle (2011-2016), and an 80 % confidence interval. The results obtained for Herring Gulls show that there is no decline in abundance above the 0.5% threshold, that the upper bound of the 80% confidence interval includes the value 0%, and that the mean percentage difference is centred on 0. Consequently, the parameter "relative abundance (short-term calculation)" is considered to have been reached for this species in the Northern UMR of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North UMR of the Bay of Biscay marine sub-region and the South UMR of the Bay of Biscay marine sub-region.

Based on the counting data of the breeding pairs, the parameter "Breeding success" is calculated over the period 2011-2016. The metric for this parameter corresponds to a number of years for which the annual percentage of colonies in massive reproductive failure exceeds 5 % of the colonies monitored (OSPAR method B3: https://oap.ospar.org/en/ospar-assessments/intermediate-assessment-2017/biodiversity-status/marine-birds/marine-bird-breeding-success-failure/). For Herring Gulls, the results show that the annual percentage of colonies in massive reproductive failure does not exceed 5 % in any year for the period 2011-2016. The "reproductive success" parameter is therefore achieved for this species in the MRU Nord of the Bay of Biscay marine sub-region.

This parameter, related to criterion D1C4, allows the estimation of a mean annual percentage difference in the proportion of area occupied by the species over the assessment cycle (2011-2016), as well as an 80% confidence interval. The results obtained for Herring Gulls show that the 80% confidence interval of the mean annual percentage difference in the proportion of area occupied by the species is [-2.6% - 0.1%] for the period 2011-2016. The upper bound of the 80% confidence interval is therefore above the 0% threshold. Consequently, the "Distribution (spatial)" parameter is considered to have been reached for this species in the North MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the North MRU of the Bay of Biscay marine sub-region. and the MRU South of the Bay of Biscay marine sub-region

The metric for this parameter is a rate of change in abundance between the reference period (calculated from the 1987-1989 censuses) and the most recent period (2010 or 2016 depending on the species). The rate of change in the abundance of breeding pairs of Brown Gulls is positive between 1988 and 2010 (numbers in 2010 are higher than in 1988). The parameter "Relative abundance (long-term calculation)" is therefore reached for this species in the MRU Nord of the Bay of Biscay marine sub-region.

This parameter, relating to criterion D1C2, allows the estimation of a percentage annual mean difference in relative abundance of a species, calculated over the assessment cycle (2011-2016), and an 80 % confidence interval. The results obtained for the Great Black-backed Gull show that there is a decline in abundance above the 0.5% threshold, although the upper bound of the 80% confidence interval includes the value 0%, and the mean percentage difference is relatively centred on 0. Consequently, the parameter "relative abundance (short-term calculation)" is considered not to have been reached for this species in the Northern MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

This parameter, related to criterion D1C4, allows the estimation of a mean annual percentage difference in the proportion of area occupied by the species over the assessment cycle (2011-2016), as well as an 80% confidence interval. The results obtained for the Great Black-backed Gull show that the 80% confidence interval of the mean annual percentage difference in the proportion of area occupied by the species is [-3.3% - -0.6%] for the period 2011-2016. The upper bound of the 80% confidence interval is therefore below the 0% threshold. Consequently, the "Distribution (spatial)" parameter is considered as not being reached for this species in the Northern MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

The metric for this parameter is a rate of change in abundance between the reference period (calculated from the 1987-1989 censuses) and the most recent period (2010 or 2016 depending on the species). The rate of change in abundance of breeding pairs of Great Black-backed Gulls is positive between 1988 and 2010 (the numbers in 2010 are greater than in 1988). The parameter "Relative abundance (long-term calculation)" is therefore reached for this species in the MRU Nord of the Bay of Biscay marine sub-region.

This parameter, relating to criterion D1C2, allows the estimation of a percentage annual mean difference in relative abundance of a species, calculated over the assessment cycle (2011-2016), and an 80 % confidence interval. The results obtained for the Great Black-backed Gull show that there is no decline in abundance above the 0.5% threshold, that the upper bound of the 80% confidence interval includes the value 0%, and that the mean percentage difference is centred on 0. Consequently, the parameter "relative abundance (short-term calculation)" is considered to have been reached for this species in the MRU Nord de lasous marine region Bay of Biscay. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

This parameter, related to criterion D1C4, allows the estimation of a mean annual percentage difference in the proportion of area occupied by the species over the assessment cycle (2011-2016), as well as an 80% confidence interval. The results obtained for the Great Black-backed Gull show that the 80% confidence interval of the mean annual percentage difference in the proportion of area occupied by the species is [-0.5% - 0.4%] for the period 2011-2016. The upper bound of the 80% confidence interval is therefore above the 0% threshold. Consequently, the "Distribution (spatial)" parameter is considered to have been reached for this species in the Northern MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

The metric for this parameter is a rate of change in abundance between the reference period (calculated from the 1987-1989 censuses) and the most recent period (2010 or 2016 depending on the species). The lack of data on the abundance of breeding pairs of this species makes it impossible to conclude whether this parameter has been reached for this species.

The metric for this parameter is a rate of change in abundance between the reference period (calculated from the 1987-1989 censuses) and the most recent period (2010 or 2016 depending on the species). The rate of change in the abundance of breeding pairs of the Great Black-backed Gull is positive between 1988 and 2010 (the numbers in 2010 are greater than in 1988). The parameter "Relative abundance (long-term calculation)" is therefore reached for this species in the Northern MRU of the Bay of Biscay marine sub-region.

The metric for this parameter is a rate of change in abundance between the reference period (calculated from the 1987-1989 censuses) and the most recent period (2010 or 2016 depending on the species). The lack of data on the abundance of breeding pairs of this species makes it impossible to conclude whether this parameter has been reached for this species.

This parameter, relating to criterion D1C2, allows the estimation of a percentage annual mean difference in relative abundance of a species, calculated over the assessment cycle (2011-2016), and an 80 % confidence interval. The results obtained for the Balearic Shearwater show that there is no decline in abundance above the 0.5% threshold, that the upper bound of the 80% confidence interval includes the value 0%, and that the mean percentage difference is centred on 0. Therefore, the parameter "relative abundance (short-term calculation)" is considered to be met for this species in the Northern MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

This parameter, related to criterion D1C4, allows the estimation of a mean annual percentage difference in the proportion of area occupied by the species over the assessment cycle (2011-2016), as well as an 80% confidence interval. The results obtained for the Balearic Shearwater show that the 80% confidence interval of the mean annual percentage difference in the proportion of area occupied by the species is [-2.6% - 0.4%] for the period 2011-2016. The upper bound of the 80% confidence interval is therefore above the 0% threshold. Consequently, the "Distribution (spatial)" parameter is considered to have been reached for this species in the North MRU of the Bay of Biscay Marine Sub-Region, and it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay Marine Sub-Region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

The metric for this parameter is a rate of change in abundance between the reference period (calculated from the 1987-1989 censuses) and the most recent period (2010 or 2016 depending on the species). The rate of change in abundance of breeding pairs of English Shearwater is positive between 1988 and 2016 (the numbers in 2016 are greater than in 1988). The parameter "Relative abundance (long-term calculation)" is therefore reached for this species in the Northern MRU of the Bay of Biscay marine sub-region.

This parameter, relating to criterion D1C2, allows the estimation of a percentage annual mean difference in relative abundance of a species, calculated over the assessment cycle (2011-2016), and an 80 % confidence interval. The results obtained for English Shearwater show that there is no decline in abundance above the 0.5% threshold, that the upper bound of the 80% confidence interval includes the value 0%, and that the mean percent difference is centred on 0. Consequently, the parameter "relative abundance (short-term calculation)" is considered to have been reached for this species in the Northern MRU of the Bay of Biscay marine sub-region, and it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

This parameter, related to criterion D1C4, allows the estimation of a mean annual percentage difference in the proportion of area occupied by the species over the assessment cycle (2011-2016), as well as an 80% confidence interval. The results obtained for the English Shearwater show that the 80% confidence interval of the mean annual percentage difference in the proportion of area occupied by the species is [-0.5% - 1.5%] for the period 2011-2016. The upper bound of the 80% confidence interval is therefore above the 0% threshold. Consequently, the "Distribution (spatial)" parameter is considered to have been reached for this species in the Northern MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

The metric for this parameter is a rate of change in abundance between the reference period (calculated from the 1987-1989 censuses) and the most recent period (2010 or 2016 depending on the species). The rate of change in abundance of breeding pairs of black-legged kittiwake is negative between 1988 and 2016 (the numbers in 2016 are smaller than in 1988). The parameter "Relative abundance (long-term calculation)" is therefore not reached for this species.

This parameter, relating to criterion D1C2, allows the estimation of a percentage annual mean difference in relative abundance of a species, calculated over the assessment cycle (2011-2016), and an 80 % confidence interval. The results obtained for black-legged kittiwake show that there is no decline in abundance above the 0.5% threshold, that the upper bound of the 80% confidence interval includes the value 0%, and that the mean percentage difference is centred on 0. Consequently, the "relative abundance (short-term calculation)" parameter is considered to have been reached for this species in the Northern MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

This parameter, related to criterion D1C4, allows the estimation of a mean annual percentage difference in the proportion of area occupied by the species over the assessment cycle (2011-2016), as well as an 80% confidence interval. The results obtained for black-legged kittiwake show that the 80% confidence interval of the mean annual percentage difference in the proportion of area occupied by the species is [-1.6% - 0.6%] for the period 2011-2016. The upper bound of the 80% confidence interval is therefore above the 0% threshold. Consequently, the "Distribution (spatial)" parameter is considered to have been reached for this species in the Northern MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

This parameter, relating to criterion D1C2, allows the estimation of a percentage annual mean difference in relative abundance of a species, calculated over the assessment cycle (2011-2016), and an 80 % confidence interval. The results obtained for the parasitic jaeger show that there is no decline in abundance above the 0.5% threshold, that the upper bound of the 80% confidence interval includes the value 0%, and that the mean percentage difference is centred on 0. Consequently, the parameter "relative abundance (short-term calculation)" is considered to have been reached for this species in the Northern MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

This parameter, related to criterion D1C4, allows the estimation of a mean annual percentage difference in the proportion of area occupied by the species over the assessment cycle (2011-2016), as well as an 80% confidence interval. The results obtained for the parasitic jaeger show that the 80% confidence interval of the mean annual percentage difference in the proportion of area occupied by the species is [-2.9% - 1.2%] for the period 2011-2016. The upper bound of the 80% confidence interval is therefore above the 0% threshold. Consequently, the "Distribution (spatial)" parameter is considered to have been reached for this species in the North MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

This parameter, relating to criterion D1C2, allows the estimation of a percentage annual mean difference in relative abundance of a species, calculated over the assessment cycle (2011-2016), and an 80 % confidence interval. The results for the Great Skua show that there is no decline in abundance above the 0.5% threshold, that the upper bound of the 80% confidence interval includes the value 0%, and that the mean percent difference is centred on 0. Consequently, the parameter "relative abundance (short-term calculation)" is considered to have been reached for this species in the Northern MRU of the Bay of Biscay marine sub-region, and it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the SRM GoG and the South MRU of the Bay of Biscay marine sub-region.

This parameter, related to criterion D1C4, allows the estimation of a mean annual percentage difference in the proportion of area occupied by the species over the assessment cycle (2011-2016), as well as an 80% confidence interval. The results obtained for the jaeger show that the 80% confidence interval of the mean annual percentage difference in the proportion of area occupied by the species is [-5.0% - -0.9%] for the period 2011-2016. The upper bound of the 80% confidence interval is therefore below the 0% threshold. Consequently, the "Distribution (spatial)" parameter is considered as not being met for this species in the North MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

The metric for this parameter is a rate of change in abundance between the reference period (calculated from the 1987-1989 censuses) and the most recent period (2010 or 2016 depending on the species). The rate of change in abundance of Roseate Tern breeding pairs is positive between 1988 and 2016 (numbers in 2016 are higher than in 1988). The parameter "Relative abundance (long-term calculation)" is thus reached for this species in the MRU Nord of the Bay of Biscay marine sub-region.

Based on the counting data of the breeding pairs, the parameter "Breeding success" is calculated over the period 2011-2016. The metric for this parameter corresponds to a number of years for which the annual percentage of colonies in massive reproductive failure exceeds 5 % of the colonies monitored (OSPAR method B3: https://oap.ospar.org/en/ospar-assessments/intermediate-assessment-2017/biodiversity-status/marine-birds/marine-bird-breeding-success-failure/). For Roseate Terns, the results show that the annual percentage of colonies in massive reproductive failure exceeds 5 % in a single year for the period 2011-2016. The "reproductive success" parameter is therefore achieved for this species in the MRU Nord of the Bay of Biscay marine sub-region.

The metric for this parameter is a rate of change in abundance between the reference period (calculated from the 1987-1989 censuses) and the most recent period (2010 or 2016 depending on the species). The rate of change in abundance of breeding pairs of common terns is positive between 1988 and 2010 (numbers in 2010 are higher than in 1988). The parameter "Relative abundance (long-term calculation)" is therefore reached for this species in the Northern MRU of the Bay of Biscay marine sub-region.

This parameter, relating to criterion D1C2, allows the estimation of a percentage annual mean difference in relative abundance of a species, calculated over the assessment cycle (2011-2016), and an 80 % confidence interval. The results obtained for common terns show that there is no decline in abundance above the 0.5% threshold, that the upper bound of the 80% confidence interval includes the value 0%, and that the mean percent difference is centred on 0. Consequently, the parameter "relative abundance (short-term calculation)" is considered to have been reached for this species in the Northern MRU of the Bay of Biscay marine sub-region, and it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

Based on the counting data of the breeding pairs, the parameter "Breeding success" is calculated over the period 2011-2016. The metric for this parameter corresponds to a number of years for which the annual percentage of colonies in massive reproductive failure exceeds 5 % of the colonies monitored (OSPAR method B3: https://oap.ospar.org/en/ospar-assessments/intermediate-assessment-2017/biodiversity-status/marine-birds/marine-bird-breeding-success-failure/). For the common tern, the results show that the annual percentage of colonies in massive reproductive failure exceeds 5 % in a single year for the period 2011-2016. The "reproductive success" parameter is therefore achieved for this species in the MRU Nord of the Bay of Biscay marine sub-region.

This parameter, related to criterion D1C4, allows the estimation of a mean annual percentage difference in the proportion of area occupied by the species over the assessment cycle (2011-2016), as well as an 80% confidence interval. The results obtained for the common tern show that the 80% confidence interval of the mean annual percentage difference in the proportion of area occupied by the species is [-1.7% - 0.4%] for the period 2011-2016. The upper bound of the 80% confidence interval is therefore above the 0% threshold. Consequently, the "Distribution (spatial)" parameter is considered to have been reached for this species in the Northern MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

The metric for this parameter is a rate of change in abundance between the reference period (calculated from the 1987-1989 censuses) and the most recent period (2010 or 2016 depending on the species). The rate of change in the abundance of breeding pairs of the caudal tern is positive between 1988 and 2016 (the numbers in 2016 are greater than in 1988). The parameter "Relative abundance (long-term calculation)" is thus reached for this species in the MRU North of the Bay of Biscay marine sub-region.

This parameter, relating to criterion D1C2, allows the estimation of a percentage annual mean difference in relative abundance of a species, calculated over the assessment cycle (2011-2016), and an 80 % confidence interval. The results obtained for the common tern show that there is no decline in abundance above the 0.5% threshold, that the upper limit of the 80% confidence interval includes the value 0%, and that the mean percentage difference is centred on 0. Consequently, the parameter "relative abundance (short-term calculation)" is considered to have been reached for this species in the Northern MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.

Based on the counting data of the breeding pairs, the parameter "Breeding success" is calculated over the period 2011-2016. The metric for this parameter corresponds to a number of years for which the annual percentage of colonies in massive reproductive failure exceeds 5 % of the colonies monitored (OSPAR method B3: https://oap.ospar.org/en/ospar-assessments/intermediate-assessment-2017/biodiversity-status/marine-birds/marine-bird-breeding-success-failure/). For the Caudal Tern, the results show that the annual percentage of colonies in massive reproductive failure does not exceed 5 % in any year for the period 2011-2016. The "reproductive success" parameter is therefore achieved for this species in the MRU Nord of the Bay of Biscay marine sub-region.

This parameter, related to criterion D1C4, allows the estimation of a mean annual percentage difference in the proportion of area occupied by the species over the assessment cycle (2011-2016), as well as an 80% confidence interval. The results obtained for the common tern show that the 80% confidence interval of the mean annual percentage difference in the proportion of area occupied by the species is [-3.7% - -1.1%] for the period 2011-2016. The upper bound of the 80% confidence interval is therefore below the 0% threshold. Consequently, the "Distribution (spatial)" parameter is considered as not being reached for this species in the Northern MRU of the Bay of Biscay marine sub-region. Furthermore, it is important to specify that the geographical unit of assessment for this parameter is the Bay of Biscay marine sub-region as a whole, without distinction between north and south. Consequently, the results reported for this parameter will be identical between the North MRU of the Bay of Biscay marine sub-region and the South MRU of the Bay of Biscay marine sub-region.