Table 3.

Aeshna viridis data overview: We have n = 114 observations from 5 ecological managers covering m = 17 locations (i.e. ditches).

Per ecological manager		Per location	Per year
Groninger Landschap:	24	8 + 8 + 8	2015:	32
Gemeente Veendam:	22	6 + 2 + 6 + 8	2016:	28
Staatsbosbeheer Twijzel:	24	8 + 8 + 8	2017:	28
Staatsbosbeheer Groningen:	2	2	2018:	26
Waterschap Hunze en Aa's:	42	8 + 8 + 2 + 8 + 8 + 8

Notes: The sums in the 2nd column indicate the numbers of observations per location. We have 8 observations (one per treatment per year) only if the location participated each year and all field studies took place. For example, in Groninger Landschap, there are three locations and for each, we have all 8 observations (24 in total). Gemeente (municipality) Veendam covers 4 locations, but we have only 2 (6) observations from the 2nd (3rd) location. The last column lists the number of observations per year.