Metadata accompanying 'tidy_data\\pop_size20_080421_zenodo.csv' Input dataset for paper: Abundance decline in the avifauna of the European Union reveals global similarities in biodiversity change Column heading Description species: species accepted latin name in HBW and BirdLife International (2019) Handbook of the Birds of the World and BirdLife International digital checklist of the birds of the world. Version 4. Available at: http://datazone.birdlife.org/userfiles/file/Species/Taxonomy/HBW-BirdLife_Checklist_v4_Dec19.zip [.xls zipped 1 MB]. subspecific_population: where relevant subspecific name, only used where data for more than one subspecies of a species were submitted in a single country. common_name: species common name in English country: EU nation submitting the data pop_est_yr_min: the minimum year of the national species population estimate pop_est_yr_max: the maximum year of the national species population estimate unit: the unit the population was measured in: p = pairs, i = individuals, males = males, bfemales = breeding females, cmales = calling males pop_min_size_rnd_n: the minimum population estimate pop_bsv: the best single value of the population estimate pop_max_size_rnd_n: the maximum population estimate of that species in that country X2.3.population_estimate_type: the type of population estimate, either: a) (estimate) best single figure or interval with no confidence intervals available; b) (mean) multi-year mean where population size has been estimated for several years; c) (interval) 95% confidence intervals estimated; d) (Minimum) insufficient information to give interval, but population known to be above a certain level. Reporting under Article 12 of the Birds Directive: Explanatory notes and guidelines for the period 2013-2018, Brussles. Available at: http://cdr.eionet.europa.eu/help/birds_art12 X2.4.population_method: categorical assessment of how the population estimate was derived, either: a) (completeSurvey) complete surveys or statistically robust estimates; b) (estimatePartial) extrapolation from limited data; or c) (estimateExpert) expert opinion with very limited data. DG Environment (2017). Reporting under Article 12 of the Birds Directive: Explanatory notes and guidelines for the period 2013-2018, Brussles. Available at: http://cdr.eionet.europa.eu/help/birds_art12 X2.5.population_sources: reference for the source of the population estimate Total.EU28.population: the estimated population of the species across all EU28 countries pop_trendlg_yr_min: the minimum year of the long-term trend estimate in national species abundance pop_trendlg_yr_max: the maximum year of the long-term trend estimate in national species abundance population_trend_long: a categorical assessment of the long-term trend in national species abundance: (I) Increasing, (D) Decreasing, (F) Fluctuating around zero, (U) Uncertain, (UNK) Unknown, or (S) Stable. DG Environment (2017). Reporting under Article 12 of the Birds Directive: Explanatory notes and guidelines for the period 2013-2018, Brussles. Available at: http://cdr.eionet.europa.eu/help/birds_art12 X3.2.4.population_trend_long_method: the method used to make the long-term trend assessment, either: a) (completeSurvey) complete surveys or statistically robust estimates; b) (estimatePartial) extrapolation from limited data; c) (estimateExpert) expert opinion with very limited data, or d) (absentData) No data available. DG Environment (2017). Reporting under Article 12 of the Birds Directive: Explanatory notes and guidelines for the period 2013-2018, Brussles. Available at: http://cdr.eionet.europa.eu/help/birds_art12 X3.2.5.population_trend_long_sources: reference for the source of the long-term trend assessment pop_ltrend_mag_min_nn_sgn: the minimum value of the long-term trend estimate in national species abundance pop_ltrend_mag_bsv: the best single value of the long-term trend estimate in national species abundance pop_ltrend_mag_max_nn_sgn: the maximum value of the long-term trend estimate in national species abundance pop_trend_yr_min: the minimum year of the short-term trend estimate in national species abundance pop_trend_yr_max: the maximum year of the short-term trend estimate in national species abundance population_trend: a categorical assessment of the short-term trend in national species abundance: (I) Increasing, (D) Decreasing, (F) Fluctuating around zero, (U) Uncertain, (UNK) Unknown, or (S) Stable. DG Environment (2017). Reporting under Article 12 of the Birds Directive: Explanatory notes and guidelines for the period 2013-2018, Brussles. Available at: http://cdr.eionet.europa.eu/help/birds_art12 X3.1.4.population_trend_method: the method used to make the short-term trend assessment, either: a) (completeSurvey) complete surveys or statistically robust estimates; b) (estimatePartial) extrapolation from limited data; c) (estimateExpert) expert opinion with very limited data, or d) (absentData) No data available. DG Environment (2017). Reporting under Article 12 of the Birds Directive: Explanatory notes and guidelines for the period 2013-2018, Brussles. Available at: http://cdr.eionet.europa.eu/help/birds_art12 X3.1.5.population_trend_sources: reference for the source of the short-term trend assessment pop_trend_mag_min_nn_sgn: the minimum value of the short-term trend estimate in national species abundance pop_trend_mag_bsv: the best single value of the short-term trend estimate in national species abundance pop_trend_mag_max_nn_sgn: the maximum value of the short-term trend estimate in national species abundance X1.1.country: two letter country code used in Article 12 reporting on the Birds Directive X1.2.speciescode: species code used in Article 12 reporting on the Birds Directive Sub.unit.code: sub unit code used in Article 12 reporting on the Birds Directive X1.4.speciesname: species latin name used in Article 12 reporting on the Birds Directive