Evolution of the breeding bird populations in the Drugeon basin, Franche-Comté, France, based on IPA (1998-2020)

Counts were carried out using the IPA method  described in Blondel et al (1970), IBCC (1977) and Blondel et al (1981). According to the protocol, two passes with a twenty-minute data collection per listening point were carried out each year (end of April and beginning of May for early breeders and end of May and beginning of June for late breeders), in the morning, in good weather and no wind. A value of 1 is assigned to a species for any visual or auditory contact with a pair, an occupied nest, a family, an adult carrying food, or a singing male, and a value of 0.5 is assigned to a single non-singing bird. The values per species and per passage are added up to a maximum index of 5. For each listening point, the best index of the two passages was retained for the analysis. Data collection was carried out between 6.30 and 9.00 a.m. during the first pass and between 6.00 and 9.00 a.m. during the second. For more details see Michelat et al. (2023) full reference below.

IPA distribution according to years and habitats

FILE DESCRIPTION

IPA_localisation.txt

• id, IPA Id: digit 1-2, habitat; digit 3-4, IPA number within the habitat
• habitat
• iddom, second ID in clear
• commune
• lieu, locality
• long, longitude
• lat, latitude
• alt, altitude
• rnr, Réserve naturelle régionale (yes/no)
• natura, Natura 2000 area (yes/no)
• apb, Arrêté de protection de biotope (yes/no)

Observations.txt IPA values

• idipa, IPA Id: digit 1-2, habitat; digit 3-4, IPA number within the habitat
• an, year
• column 3 to 144 species names  (used to join with the table Species_statuts.txt)

Species_statuts.txt

• id, id number
• nom, common name (in French)
• nomlat, latin name
• nomab, abridged name (used to join with the table Observations.txt).
• lre, European red or orange list (LR-CR, red list, critically endangered: LR-EN, red list, endangered; LR-VU, red list, vulnerable; LO-NT, orange list, nearly threatened)
• lre27, red or orange list in the European Union (27 countries)
• lrf, French red or orange list
• lrfc, red of orange list in Franche-Comté
• lr, present on at least one of 4 red lists
• lo, present on at least one of 4 orange lists
• lro, present on at least one of 4 red or orange lists
• hn, habitat (national)
• hr, habitat (regional)
• pref, preference
• mig, migratory status

SUPPLEMENTARY MATERIAL

• IPA_distribution_map.png Map of the IPA locations in the Drugeon basin. The red line indicates the limits of the Natura 2000 Special Protection Area. BD ORTHO © cartographic background kindly provided for research by IGN.
• Graphics.zip Boxplots

BIBLIOGRAPHY

Blondel (J.), Ferry (C.) et Frochot (B.) 1970. - La méthode des indices ponctuels d’abondance (IPA) ou relevés d’avifaune par « station s’écoute ». Alauda, 38 : 55-71. Available here

Blondel (J.), Ferry (C.) & Frochot (B.) 1981. - Points counts with unlimited distance. Studies in Avian Biology, 6 : 414-419. Available here

IBCC 1977. - Censuring breeding bird by IPA method. Polish Ecological Studies, 3 : 15-17.

Michelat, D., Dupuis, O., Vaniscotte, A., Giraudoux, P., 2023. Quarante ans d’évolution du peuplement d’oiseaux nicheurs dans le bassin du Drugeon, Franche-Comté, France. Alauda submitted.