Occurrence dataset Registered February 21, 2024
Common bird monitoring scheme in Bulgaria
Description
The Common bird monitoring scheme is developed by the Bulgarian Society for the Protection of Birds. The data are used to produce trends of common birds in the country which are published in nine yearly reports. These reports contain not only individual species trends but also habitat indices like the Farmland bird index and Forest Bird Index. The first year of publication is 2007 which contains the first assessment of the species trends for the period 2005-2007.
Data are submitted annually to the Pan European Common Bird Monitoring Scheme administration to produce European wide indices and species trends. These trends and indices are delivered to the European Commission and Eurostat for decision-making.
The current data set presents data for each individual survey plot visited in the period mentioned below.
Geographic scope
- Description
Bulgaria
- Latitude
- From 41.458 to 44.113
- Longitude
- From 22.514 to 28.377
Temporal scope
- range
- May 03, 2004 - June 20, 2023
Taxonomic scope
- Description
N/A
- Coverage
- Aves
Methodology
- Sampling
The field survey methodology includes selection of two transects oriented N-S or E-W depending on the terrain. Transects are recommended to be 500m apart from each other and 250 m from the sides of the square. If the terrain does not allow, it is possible to use data from only one transect to include the square into the surveys.
The sampling effort includes two transects across the square, 1 km long each. If the terrain does not allow surveying of 2 transects, the data from survey plot can be considered even with only one transect. Each square has one person responsible for it.
Once the transects are selected, the observer should conduct two visits each year in approximately the same time. First (early) visit is in the period April 15th to May 15th and second (late) visit in the period May 16th – June 15th. Mountainous survey plots may have later dates for visits.- Study extent
The survey methodology description includes two sections: selection of survey plots and field surveying. The selection of survey plots is semi-stratified. In each 10 km UTM square in the country are randomly selected 5 squares 1x1 km each. From these squares, volunteers can choose a 1x1 km square depending upon its proximity to their homes.
- Method steps
During survey work, observers record each individual bird. The distance to the birds is entered in four categories 1 (0-25m), 2 (25-100m), 3 (>100 m), F – for birds flying over. Other than bird data, observers are asked to collect data for the beginning and the end of the survey. The database calculates the number of visits per year of each survey plot in relation to the date of visit.
The data collected in the period 2004 - 2016, are georeferenced in the centroid of the MGRS UTM 1 km.
Data after 2016 are collected with a mobile app for Android developed specifically for the purpose (SmartBirds Pro).
Metrics
Contacts
- Organization
- Bulgarian Society for the Protection of Birds
- Position
- Monitoring officer
- Address
- Yavorov quarter, Bl. 71, Entr. 4, app. 1
- Roles
- Originator
Editor
Administrative point of contact - Phone
- Organization
- Bulgarian Society for the Protection of Birds
- Position
- Conservation director
- Address
- Yavorov quarter, Bl. 71, Entr. 4, app. 1
- Roles
- Originator
Administrative point of contact - Phone
- Organization
- Bulgarian Society for the Protection of Birds
- Position
- Project manager
- Address
- Yavorov quarter, Bl. 71, Entr. 4, app. 1
- Roles
- Originator
- Phone
- Organization
- Bulgarian Society for the Protection of Birds
- Position
- DB manager
- Address
- Plovdiv
- Roles
- Originator
Metadata author
Administrative point of contact - Phone
- User ID
GBIF registration
- Registration date
- February 21, 2024
- Metadata last modified
- February 22, 2024
- Publication date
- February 22, 2024
- Hosted by
- GBIF Secretariat
- Installation
- GBIF Europe and Central Asia
- Endpoints
- Darwin Core Archive
- EML
- Preferred identifier
- 10.15468/t6scvp
- Alternative identifiers