Breeding male Ortolan Bunting observations from Finland 2000-2018

Ortolan Bunting male territory observations from Finland from 2000-2018 and R-code used to analyse the association between population growth rate and various environmental and spatial variables. Data includes individual identification number for 238 singing groups (id), the year of the observation (year), number of observed territories within a singing group at the year of the observation (terri), number of observed territories during the previous year (terpre), proportion of agricultural land use within the singing group landscape (agri5), the mean daily precipitation (mm) (prec) and temperature (ºC) (temp) of the previous year summer, Shannon-Wiener diversity index of crop types within the singing group area (shang), proportion of crop types which provide bare ground in spring (bare), density of buildings (build), rivers (river), streams (stream) and roads (road), the municipality (municipality) and the region (region) where the singing group is located., The territories of the Ortolan Buntings were mapped annually using a two-visit mapping method. To form a study unit, we aggregated observations of territories from the years 2000–2017 (observations from the year 2018 were added in after the forming of singing groups) based on their proximity and surrounding landscape. Territories that were less than 500 metres away from each other, were considered to belong to the same singing group, i.e., subpopulation. Then, we drew a 250-meter buffer around each territory observation within a singing group, merged the overlapping buffers, and interpreted the outline as delineating the area occupied by that singing group. Some singing groups were split and merged according to field observations and expert opinion. For the statistical analysis, we first delimited our data to only those cases that had data from two consecutive years, i.e., with no gap between annual observations. Then we created a variable describing the number of territories in a singi..., , # Breeding male Ortolan Bunting observations from Finland 2000-2018

[https://doi.org/10.5061/dryad.pc866t1wc](https://doi.org/10.5061/dryad.pc866t1wc)

## Description of the data and file structure

The data includes a CSV data table of 678 observations with 15 variables and an R-code used to analyse the association between population growth rate and various environmental and spatial variables.

In the data table, each observation (row) corresponds to the findings of one year's territorial mapping within a certain singing group's area. The municipality and region of the singing group are included but the exact coordinates of the locations are shared only on request. 

### Variables

* id = singing group
* year = year of observation
* terri = number of observed territories within a singing group at the year of the observation
* terpre = number of observed territories during the previous year
* agri5 = proportion of agricultural land use within the singing group landscape
* p...