Another sign of winters approach Restless Flycatcher

["wallaces" <>]

The attached map compares the reporting rate in summer to that in winter for the period 1981 to 2012 for all surveys, including the GBS, by grid cell. The pattern is similar for each decade within this period and fairly consistent with Philip's description in the GBS.

 

Some explanation of the map is required. Red cells indicate that the reporting rate is at least 50% lower in the summer, green that the reporting rate is at least 50% higher in the summer. The grey background to the cells indicates the number of sheets (the darker the cell, the more sheets). A cell which is grey but without a red or green square indicates that the reporting rate in summer is  within +/- 50% of the winter reporting rate. A plus sign (+) indicates that there are no winter records for that cell and a cross (X) indicates that there are no summer records for that cell. Only cells with datasheets in both winter and summer are included. Cells without datasheets in both periods are white. One observer week in the GBS is considered a datasheet.

 

I have a similar map comparing the earlier years (all months) to the current period which I will send later.

 

Steve