The present paper represents a study concerning the ecology of macroinvertebrate communities from the Someºul Rece river course, with special emphasis on the following groups: oligochaetes, mayflies, stoneflies and water mites.
Previous studies concerning the Someºul Rece flora and fauna at two sampling sites located downstream and upstream of Blãjoaia were carried out by a team coordinated by Sarkany-Kiss & Hamar (1999). This study included all the major groups analyzed in the present paper, except for water mites.
So far, general studies concerning the groundwater environment in the Someºul Rece catchment area were made by Cîmpean et al., 2003.The list of water mite species from the groundwater habitats was published by Konnarth-Ionescu, 1979, including data from Motaº and Szalay. Mayflies communities from Apuseni Mountains were studied by Gãldean, 1994. | 
