The EBP demo viewer aims at showing the scope and potential of the EBP project and its future developments. It is, therefore, solely a very first insight about the possibilities of the collaborative work of European on-line bird recording schemes under the auspices of the EBCC.
The EBP demo viewer shows animated maps depicting the week-by-week distributional patterns of 100 species in six years (2010-2015) at a resolution of 30x30 km. A total of five types of species maps and four of climatic variables are shown. Two animated maps of any species or climatic variable, year and type can be selected to be shown simultaneously for direct comparison.
Moreover, the option "All years", in the year dropdown list, allows the visualization of the overall seasonal patterns of bird distribution and the climatic variables averaged across the different years of available data. All in all, therefore, more than 20.6 million different map combinations are available to choose from.
Note that you can either select natural years (for example “2014”) or July to June interannual cycles (for example “2014/15”). In the latter, the time series starts at week number 27 of the first year (2–8 July), and finishes in week number 26 of the following year (25 June – 1 July). When selecting natural years the time series starts in week number 1 (1–7 January) and finishes in week number 52 (26–30 December).
The species maps shown in the EBP demo viewer are based on 165 million bird records submitted between 2010 and 2015 to the on-line bird recording portals run by the project partners (the data provided by the most recent EBP partners will be shown in the viewer in late summer, once the viewer is updated with the data for the period 2010-2016). These records were subsequently aggregated by week and 30x30 km square (based on the European Environment Agency reference grid ETRS89-LAEA) summarizing information on the number of observations of each species, the number of counted birds and the recording effort (number of complete lists and total number of records and observers). Four of the species maps (occurrence, traces, counts and phenology) reflect, in different ways, the raw information contained in the aggregated data, while the fifth one (corrected regional occurrence) uses various analytical procedures to account for heterogeneity in observational effort and species reporting rates.
The maps depicting climatic variables have been prepared using the E-OBS high-resolution gridded dataset v10.0. Like species maps, the original E-OBS dataset was aggregated by week and 30x30 km square.
In all cases, only those 30x30 km squares including terrestrial areas are shown in the maps.
These maps show the 30x30 km squares where the selected species was recorded or not each week. Note that not all species detected end up being reported and, thus, the absence of records in a given square does not automatically mean that the species was not observed there.
These maps show the 30x30 km squares where the selected species has been recorded during each week but also during the two previous ones, enhancing the visualization of rapid temporal changes in distribution and their “traces” over time. Note that not all species detected end up being reported and, thus, the absence of records in a given square does not automatically mean that the species was not observed there.
These maps show the maximum count recorded for the selected species in each 30x30 km square and week (in "All years" maps, the average of the maximum count of each year is shown). Note that the original counts used to obtain these figures mostly refer to casual counts or rough estimates of the number of birds detected in a given site and date. Only rarely they refer to formal censuses or exhaustive counts. These maps, therefore, only show a rough approximation of the real variability in bird numbers across space and time. Also take into account that not all species detected end up being reported and, thus, the absence of records in a given square does not automatically mean that the species was not observed there.
Corrected regional occurrence (CRO) map
These maps make use of a complex set of spatial and temporal aggregation and smoothing procedures to account for differences in observational effort and reporting activity of the observers (click here for further details). They are specifically intended to help visualize large-scale temporal changes in bird distribution and thus they should not be interpreted at a local scale. For each 30x30 km square and week these maps depict the estimated regional frequency of occurrence of the selected species. Modelling the spatial and temporal dynamics of bird distributions is one of the main but challenging objectives of the EBP project. This work is underway and, therefore, it has to be stressed that the maps shown here are very preliminary.
These maps depict the phenology of the selected species in seven different geographical sectors according to the percentage of 30x30 km squares where the species has been recorded in each sector and week.
Minimum temperature map
These maps show the minimum temperature for each 30x30 km square and week (recalculated from E-OBS high-resolution gridded dataset v10.0). In "All years" maps, the average of the minimum temperature of each year is shown.
Maximum temperature map
These maps show the maximum temperature for each 30x30 km square and week (recalculated from E-OBS high-resolution gridded dataset v10.0). In "All years" maps, the average of the maximum temperature of each year is shown.
Mean temperature map
These maps show the mean temperature for each 30x30 km square and week (recalculated from E-OBS high-resolution gridded dataset v10.0). In "All years" maps, the average of the mean temperature of each year is shown.