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   "description": "The Canadian Breeding Bird Census (BBC) Database contains data for 928 breeding bird plot censuses representing all known censuses of breeding birds carried out in Canada during the period 1929\u20131993. The 928 records in the database represent 640 unique census plots located in all provinces and territories, except Prince Edward Island. The BBC, which was replaced by the current Breeding Bird Survey, is one of the longest-running surveys of bird populations in North America, and was designed to help determine abundance and distribution patterns of bird species. An important feature of the BBC Database is the habitat data associated with each census plot. The most prevalent vegetation species in different layers (canopy, shrub and ground cover) were recorded to reflect the assumption that birds respond principally to vegetative structure. The report describing the contents of the Canadian Breeding Bird (Mapping) Census Database is available at the following address: http://publications.gc.ca/collections/Collection/CW69-5-342E.pdfThe main sources of the census data were published articles, and unpublished reports, theses and census lists. The two datasets provide descriptive information for census plots, source citations and summary census data, and data for each species observed in census plots. HOW TO USE THE DATA: After downloading the datasets, both datasets must be imported in a database management system. The two datasets must be linked by the \u201cRECNO\u201d field in order to associate the census plot data and the species data. ****La base de données du recensement canadien des oiseaux nicheurs (RON) contient les données de 928 parcelles de recensement des oiseaux nicheurs représentant l\u2019ensemble des relevés d\u2019oiseaux nicheurs menés au Canada sur la période allant de 1929 à 1993. Les 928 enregistrements de la base de données représentent 640 parcelles de terrain distinctes recensées dans chaque province et territoires, à l\u2019exception de l\u2019Île-du-Prince-Édouard. Le RON, remplacé par l\u2019actuel Relevé des oiseaux nicheurs, constitue l\u2019une des plus anciennes études des populations d\u2019oiseaux en Amérique du Nord et servait à déterminer l\u2019abondance et la distribution des espèces d\u2019oiseau. Les données sur les habitats associées à chaque parcelle de terrain recensée constituent une caractéristique importante de la base de données du RON. Les espèces végétales les plus répandues sur différentes strates (arborée, arbustive et herbacée) ont été notées de manière à refléter l\u2019hypothèse que les oiseaux réagissent principalement aux structures de la végétation. Le rapport décrivant le contenu de la base de données du recensement canadien des oiseaux nicheurs est disponible à l\u2019adresse suivante : http://publications.gc.ca/collections/Collection/CW69-5-342F.pdfLes principales sources des données de recensement proviennent d\u2019articles publiés, de rapports inédits, de thèses et de listes de recensement. Les deux ensembles de données fournissent des informations sur les parcelles de recensement, les références aux sources et un sommaire des données de recensement, ainsi que des données sur chaque espèce observée dans les parcelles de recensement. UTILISATION DES DONNÉES: Après avoir téléchargé les ensembles de données, chaque ensemble doit être importé dans un système de gestion de base de données. Les deux ensembles de données doivent être liés par le champ «RECNO» de manière à associer les données des parcelles de recensement et les données sur les espèces observées.",
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