“…In contrast, other authors reported similar enzyme activity against CDNB (nmol/min/mg protein), ranging within an order of magnitude among black flies (190-452), 36,58) caddisflies (90-501), 36,56,63) mayflies (261-337), 36,63) damselflies (445), 36) and midges (161-502, C. tentans 46,47,64) ; 63-250, C. riparius 48,50,59) ). These variations may originate not only from species differences but also as a result of different exposure histories to contaminants.…”