Table 2.
Maximum annual abundance and capture date at 7 collection sites in Belgium
| Site | 2007 | 2008 | 2009 | 2010 | 2011 | Average inter-site rank 2007–2009; 7 sites | Average inter-site rank 2007–2011; 4 sites |
|---|---|---|---|---|---|---|---|
| Nijlen | 1186 (19/06/2007) |
3289 (29/07/2008) |
457 (11/08/2009) |
471 (29/06/2010) |
336 (28/06/2011) |
2.33 | 1.4 |
| Varendonk | 2337 (9/05/2007) |
12,000 (22/04/2008) |
1829 (30/06/2009) |
1859 (15/06/2010) |
8787 (12/10/2011) |
4.67 | 3 |
| Neerpelt | 708 (19/06/2007) |
4700 (8/07/2008) |
3462 (30/06/2009) |
- | - | 3.67 | - |
| Frahan | 1941 (13/09/2007) |
8310 (6/05/2008) |
5046 (1/07/2009) |
- | - | 5 | - |
| Goronne | 13,896 (2/10/2007) |
2450 (11/08/2008) |
3005 (19/05/2009) |
- | - | 4.33 | - |
| Verlaine | 495 (6/06/2007) |
791 (27/05/2008) |
1044 (16/07/2009) |
2166 (29/06/2010) |
1699 (30/05/2011) |
1.33 | 1.8 |
| Gembloux | 4000 (9/10/2007) |
25,445 (14/05/2008) |
5200 (9/06/2009) |
10,935 (30/06/2010) |
6700 (23/08/2011) |
6.67 | 3.8 |
| Fold differencea | 28 | 32 | 11 | 23 | 26 | - | - |
aFold difference between sites with the highest and lowest maximum annual abundance