I worked for SNH for a while, there was a moth trap on the reserve on the go 24/7/365,some of the moths were scarce types , but it didn't stop the trap,not only was it catching moths but a lot of other night fliers as well, I managed to Identify 4 different sedges,and at least one moth on the reserve was on the European red list, luckily it was a day flier, I know this was only one trap in one place, but the overall impact at the reserve must have been quite heavy, we had rare Dragonflies there as well , and as insect eaters this must have impacted on them, I have watched Dragonflies catching and earing Magpie moths, and seeing them catching upwings as well, so every thing has a knock on effect, no such thing as a free lunch, Derek Roxborough