It is possible the differences between macroinvertebrate and insect richness observed at the organic cultivation may be due to the differences of electric conductivity between
the entrance and exit at this cultivation, though this is not likely. Then, we can assume that the absence of some families of sensitive macroinvertebrates in the conventional treatment (Baetidae,Leptohyphidae, and Leptophlebiidae), may be due to the use of
synthetic insecticides.