Hydrobiologia The International Journal of Aquatic Sciences Volume 517, 1 April 2004 On the celestite-secreting Acantharia and their effect on seawater strontium to calcium ratios P. De Deckker Phosphorus accumulation in the littoral zone of a subtropial lake K.E. Havens, B. Sharfstein, A.J. Rodusky, T.L. East Quantifying species indicator values for trophic diatom indices: a comparison of approaches M.G. Potapova, D.F. Charles, K.C. Ponader, D.M. Winter An annotated checklist of dinoflagellates in the Black Sea F. Gomez, L. Boicenco Separation of two Neotropical species: Macrothrix superaculeata (Smirnov, 1982) versus M. elegans Sars, 1901 (Macrothricidae, Anomopoda, Cladocera) A.A. Kotov, T. Garfias-Espejo, M. Elias-Gutiérrez Erpobdella (Dina) parva complex (Annelida: Hirudinea: Arhynchobdellida: Erpobdel- lidae): additional description of Erpobdella parva, E. dubia, and E. lahontana and taxonomic revision P. Hovingh The influence of experimentally generated turbulence on the Mash01 unicellular Micro- cystis aeruginosa strain R.H. Regel, J.D. Brookes, G.G. Ganf, R.W. Griffiths 107-120 Physiological responses of phytoplankton communities in the Irish Sea to simulated upwelling J.A. Berges, C.E. Gibson, B.M. Stewart 121-132 A rapid method for the estimation of rock surface areas M.J. McWhinnie, S.J. Chapman, A.C. Edwards, Y.E.M. Cook 133-136 Space as a limiting resource in freshwater systems: competition between zebra mus- sels (Dreissena polymorpha) and freshwater sponges (Porifera) T.E. Lauer, A. Spacie 137-145 A revision of the genus Neoneuromus in China (Megaloptera: Corydalidae) X. Liu, D. Yang 147-159 The freshwater planarian Dugesia sicula Lepori, 1948 (Platyhelminthes, Tricladida) in Tunisia: ecology, karyology, and morphology M. Charni, A.H. Harrath, R. Sluys, S. Tekaya, F. Zghal 161-170 Vertically detailed in situ measurements of gelbstoff: demonstrating the impact of a runoff event S.W. Effler, D.M. O’Donnell, M.G. Perkins, D.G. Smith 171-177 1\ The salinity tolerance of eggs and hatchlings of selected aquatic macroinvertebrates in south-east Australia and South Africa B.J. Kefford, A. Daiton, C.G. Palmer, D. Nugegoda 179-192 Cluwer)nline Kluwer) line Contact your librarian for more information