Table 1.

Total yearly abundances at comparable collection time points at each location between 2007–2011

Site	2007 (n = 29)	2008 (n = 24)	2009 (n = 22)	2010 (n = 25)	2011 (n = 38)	Average inter-site rank 2007–2009; 7 sites	Average inter-site rank 2007–2011; 4 sites
Nijlen	696	8269	1020	1015	1824	1.67	1.20
Varendonk	3634	14,658	2586	5151	14,992	4.33	2.80
Neerpelt	1558	2242	3809	–	–	2.67	–
Frahan	10,277	12,135	9569	–	–	6.33	–
Goronne	8702	11,773	6233	–	–	5.00	–
Verlaine	1111	2549	1139	7652	7610	2.00	2.00
Gembloux	9060	17,957	6208	16,476	20,319	6.00	4.00
Fold difference a	15	8	9	16	11	–	–

Abbreviation: n number of comparable collection time points

^aFold difference between sites with the highest and lowest total yearly abundance