| Summary: | This data set contains information on breeding abundance and breeding productivity of black-legged kittiwake (Rissa tridactyla) in OSPAR Region II (Greater North Sea). These data have been used to construct a demographic indicator of breeding productivity as part of OSPAR Quality Status Report 2023, and for reporting under the European Union's Marine Strategy Framework Directive. Funding provided by: European Commission Crossref Funder Registry ID: https://ror.org/00k4n6c32 Award Number: 110661/2020/839628/SUB/ENV.C.2 Data on seabird breeding abundance and breeding productivity were collected by many (mostly volunteer) observers in countries around the Greater North Sea (OSPAR Region II). Data collection was organised by national agencies resposible for biodiversity monitoring, and reported to the data centre at the International Council for the Exploration of the Seas (ICES, https://www.ices.dk/data/data-portals/Pages/Biodiversity.aspx ) . Breeding productivity data represent raw observational data, i.e. numbers of nests and numbers of fledged chicks observed for each monitoring plot. Breeding abundance data have been processed into an indicator of relative abundance, as described in: Dierschke, V., Marra, S., Parsons, M., French, G. & Fusi, M. 2023. Marine bird abundance. In The 2023 Quality Status Report for the Northeast Atlantic. (ed. OSPAR). London: OSPAR Commission. Available at: https://oap.ospar.org/en/ospar-assessments/quality-status-reports/qsr-2023/indicator-assessments/marine-bird-abundance/ . For this purpose, data on black-legged kittiwakes were extracted.
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