In two groundwater canals of a water work in West Germany the drift of stygobiont groundwater organisms was investigated. The collections were made at two-hour intervals. Niphargus aquilex Schiodte, Crangonyx subterraneus Bate and Graeteriella unisetigera (Graeter) were considered more closely, because they were caught in greater numbers than other organisms. These stygobionts show no sign of dial periodicity.
Studies on subterranean drift of stygobiont Crustaceans (Niphargus, Crangonyx, Graeteriella).
International Journal of Speleology,
Available at: http://scholarcommons.usf.edu/ijs/vol8/iss1/7