hydrobiologia volume 286 (1994), contents no. 1 P. Jensen: Revision of Ethmolaiminae Filipjev & Stekhoven, 1941 (Nematoda, Chromadorida), with descriptions of one new genus and three new species R. Palomaki: Response by macrozoobenthos biomass to water level regulation in some Finnish lake littoral zones K. L. Seip & H. Goldstein: Different responses to changes in phosphorus, P, among lakes. A study of slopes in chl-a = f(P) graphs H. lvarsson & M. Jansson: Regional variation of dissolved organic matter in running waters in central northern Sweden J. Kjensmo: Internal energy, the work of the wind, and the thermal stability in Lake Tyrifjord, southeastern Norway Book reviews Announcement no. 2 1. Mufioz & N. Prat: Macroinvertebrate community in the lower Ebro river (NE Spain) H. Obregén-Barboza, S. Contreras-Balderas & M. de Lourdes Lozano-Vilano: The fishes of northern and central Veracruz, Mexico D. M. Klarer & D. F. Millie: Regulation of phytoplankton dynamics in a Laurentian Great Lakes estuary T. R. McClanahan & J. C. Mutere: Coral and sea urchin assemblage structure and interrelation- ships in Kenyan reef lagoons Yu. Yu. Dgebuadze, A. S. Golubtsov, V. N. Mikheev & M. V. Mina: Four fish species new to the Omo-Turkana basin, with comments on the distribution of Nemacheilus abyssinicus (Cypriniformes: Balitoridae) in Ethiopia no. 3 J. Mathieu, K. Essafi-Chergui & F. Jeannerod: A gradient of interstitial Niphargus rhenorhodanen- sis populations in two karst/floodplain transition zones of the French Jura C. P. Valsaraj & V. N. R. Rao: Nitrogen limitation in the tropical waters of the Bay of Bengal G. Mura, P. Venanzi, V. Avalle & G. B. Quaglia: Fatty acid and amino acid composition of two fairy shrimp species (Crustacea, Anostraca) from Italy: Chirocephalus diaphanus and Chirocephalus kerkyrensis H. A. Neckles & C. Neill: Hydrologic control of litter decomposition in seasonally flooded prairie marshes K. M. Swaileh, M. N. Mesmar & N. S. Ismail: Heavy metal concentrations in common freshwater snails of Azraq Oasis, Jordan S. |. Ovie & H. A. Adeniji: Zooplankton and environmental characteristics of Shiroro Lake at the extremes of its hydrological cycle Book reviews Author index