Dataset for study Long-term changes in urban bird populations: correspondence of the trends between urban and rural areas

Dataset used for a study "Long-term changes in urban bird populations: correspondence of the trends between urban and rural areas"

Data structure:

Type = type of environment (R - rural, U - urban)
POID = unique identifier of each census point across all transects
Transect = unique identifier of a transect (each contains 20 census points)
Point = unique identifier of a point within one transect
Year = year of the count
Species    = scientific name of bird species
Count = number of birds counted

Each species has its own datafile.