Two new nearctic species of small orthocladiinae (Diptera: Chironomidae) with notes on ecology Broughton A. Caldwell OriginalPaper Pages: 1 - 7
Larval development of the rhizocephalan cirripede Briarosaccus tenellus (Maxillopoda: Thecostraca) reared in the laboratory: a scanning electron microscopy study Dieter WalossekJens T. HøegThomas C. Shirley OriginalPaper Pages: 9 - 47
Valve movement of the freshwater mussel Anodonta anatina: a reciprocal transplant experiment between lake and river Vili P. M. EnglundMikko P. Heino OriginalPaper Pages: 49 - 56
Quantitative relationships of invertebrates to pH in Norwegian river systems Jorunn LarsenH. J. B. BirkslArne Fjellheim OriginalPaper Pages: 57 - 74
Ratios of expected values (REX), a method for impact evaluation of thermal discharges on the fish community in the Pickering littoral waters of Lake Ontario M. V. A. TufescuT. V. Tufescu OriginalPaper Pages: 75 - 83