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 | - | - |