IX. Running Waters (continued)

PAOLTNI,J. E.: Organic carbon in the Orinoco River (Venezuela) 2077

JUNX, W. J. & FURCH, K.: Nutrient dynamics in Amazonian floodplains:
Decomposition of herbaceous plants in aquatic and terrestrial
environments 2080

WASSON, J. G., DEJOUX, C. & MARIN, R.: Typology and donation of stream
benthos in Bolivian Andes. Region of La Paz - Bolivia - South America
(Abstract) 2085

PETERSEN jr., R. C. & SANGFORS, O.: An extreme example of the role of
fluvial hydraulics and the structure of large river ecosystems: The
Rio Bio Bio, Chile 2086

DE CABO, L. I. & WAIS, I. R.: Macrozoobenthos prospection in central
Neuquen streams, Patagonia, Argentina 2091

X. Applied Limnology. 1. Water Quality

TOLKAMP, H. H., VIERSSEN, W. VAN & KNOBEN, R. A. E.: Oxygen variation
in Dutch water types in relation to biological water quality criteria 2095

DRIESSEN, J. M. C. (ONNEKE) & TOLKAMP, H. H.: A comparison of two
methods for biological water quality essesssment in Dutch streams 2100

ROOS, C., GARDENIERS, J. J. P., ROIJACKERS, R. M. M. & PEETERS,
E. T. H. M.: Ecological assessment of Dutch inland waters: Philosophy
and preliminary results 2104

LOS, F. J., BAKED, A. H. & BRINKMAN, J. J.: An integrated freshwater
management system for the Netherlands 2107

DESCY, J.-P. & COSTE, M.: A test of methods for assessing water
quality based on diatoms 2112

FUKUSHIMA, S. & FUKUSHIMA, H.: Seasonal succession of attached algal
flora in the channel with effluent from sewage treatment plant 2117

LHOTSKY, O. & MARVAN, P.: The use of algae as bioindicators 2122

GOPAL, B. & CHAMANLAL: Distribution of aquatic macrophytes in polluted
water bodies and their bioindicator value 2125

SLADECEK,V. & TUCEK, F.: Nomogram of wafer qualify teased on
quantitative data 2130

KETTUNEN, J.: Estimates and forecasts of water quality: Compromises
between uncertainty and resolution 2133

HAMM,A.: Biologicalassessment of phosphate substitutes for detergents 2138

v. BRANDT, I. & REMETH, H.: Influence of NTA, EDTA, phosphate and
copper on the ecosystem of ponds.

Part 1: Phytoplankton 2141

KUCKLENTZ, V.: Influence of NTA, EDTA, phosphate, and copper on the
ecosystem of ponds.

Part 2: Zooplankton 2145

WULFHORST, J.: Effects of thermal and organic pollution on
macroinvertebrate communities in the River Schwalm, a Northern Hesse
hill stream (FRO) 2149

RADWAN, S., ZWOLSKI, W., KOWALCZYK, C., KOWALIK, W. & PALEOLOG, A.:
Ecological characteristics of coal mine waters in Lublin Coal Basin
(Eastern Poland) and their influence on the river zoocoenosis 2156

ANTONIETTI, R. & MONTANINI, E.: Sludge from biological treatment
plants: A source of S.C.P. for Paracyclopsfimbriatus and Moina
macrocopa 2159

HIGLER, L. W. G. & HALEWYN, R. VAN: Limnology of a tropical sewage
pond 2163

BREEMEN, L. W. C. A. VAN, KETELAARS, H. A. M., VISSER, P. & EBBENG,
J. H.: A new method to control growth of geosminproducing benthic
cyanobacteria 2168

SLADECKOVA, A.: The role of periphyton in water supply 2174

X. Applied Limnology. 2. Toxicity

FRUTIGER, A. & GAMMETER, S.: Short-term toxicity of ammonia to benthic
macroinvertebrates (Abstract) 2179

WEIDEBORG, M., HONGVE, D. & ANDRUCHOW, E.: Trace metals in Norwegian
drinkingwater sources 2180

MATSCHULLAT, J., SCHNEIDER, J., HEINRTCHS, H. & SIEWERS, U.: Acid rain
and heavy metal pollution - influence and threat for ecosystems and
drinking water 2185

FARPELL, R. E., HUANG, P. M., GERMIDA, J. J., HAMMER, U. T. & LIAW,
W. K.: Influence of mercury (II) speciation on the methylation of
mercury by Pseudomonas fluorescens 2190

WATRAS, C. J., BLOOM, N. S., FITZGERALD, W. F., HURLEY, J. P.,
KRABBENHOFT, D. P., RADA, R. G. & WIENER, J. G.: Mercury in temperate
lakes: A mechanistic field study (Abstract) 2199

JOHANSSON, K. & IVERFELDT, A.: Factors influencing the run off of
mercury from small watersheds in Sweden 2200

TAUB, F. B., KINDIG, A. C., MEADOR, J. P. & SWARTZMAN, G. L.: Effects
of seasonal succession and grazing on copper toxicity in aquatic
microcosms 2205

LINDSTR0M, E.-A. & R0RSLETT, B.: The effects of heavy metal pollution
on periphyton in a Norwegian softwater river 2215

HATAKEYAMA, S., SUGAYA, Y., SATAKE, K., MIYASHITA, M. & FUKUSHIMA, S.:
Macroinvertebrate communities in heavy metal-polluted rivers in the
Shikoku district of Japan 2220

LINGSTEN, L.: Levels of heavy metals in aquatic mosses in acidified
water bodies 2228

V.-BALOGH, K., MASTALA, Z., VARANKA, I. & SALANKI, J.: Seasonal and
local variations in the heavy metal concentration of some gastropod
species at Kis-Balaton Reservoir and Zala River (Hungary) 2231

WARREN, L. A. & ZIMMERMAN, A. P.: Rain event associated changes in
metal transport by suspended sediments in the Don River 2235

SCHIRMER, M. & SCHEFFEL, H.-J.: Biomonitoring of heavy metals in
estuaries 2241

KRAAK, M. H. S., TOUSSAINT, M., LAVY, D. & DAVIDS, C.: The effects of
heavy metals on the filtration rate of the freshwater mussel Dreissena
polymorpha (Abstract) 2246

HATTUM, B. VAN: Accumulation of trace metals from a polluted sediment
by the freshwater isopod Asellus aquaticus (L.) (Abstract) 2247

MALLEY, D. F. & CHANG, P. S. S.: Early observations on the zooplankton
community of a Precambrian Shield lake receiving experimental
additions of cadmium 2248

LAWRENCE, S. G. & HOLOKA, M. H.: Response of crustacean zooplankton
impounded in situ to cadmium at low environmental concentrations 2254

GERHARDT, A.: Sub-acute effects of cadmium on pH stressed Leptophlebia
marginata (L.) and Baetis rhodani PICTET (Ephemeroptera) (Abstract) 2260

BUSCH, D. & SCHUCHARDT, B.: The use of the freshwater mussel Dreissena
polymorpha (PALLAS) for biomonitoring heavy metals in limnic
ecosystems: The Weser (FRO) 2261

SIBLEY, T. H.: Simultaneous adsorption of trace metals by suspended
particulate matter 2265

DRAXL, R., NEUGEBAUR, K. E., ZIERIS, F.-J. & HUBER, W.: Comparison of
the ecological effects of diquat on laboratory multi species and
outdoor freshwater systems 2269

ZIMMERMANN, G. M., WEIL, L. & QUENTIN, K.-E.: Bioassay for the
determination of herbicides in water: Methods and sensitivity 2272

FLECKNER, W.: Effects of herbicides on target and non-target organisms
in aquatic systems (Abstract) 2276

BAEKKEN, T. & AANES, K. J.: Pesticides in Norwegian agriculture. Their
effects on benthic fauna in lotic environments. Preliminary results 2277

MERLIN, G. & BLAKE, G. M.: Absorption des pesticides par les
macrophytes aquatiques: Effets compares sur la photosynthese, cas du PCP 2282

EVANS, H. E.: Relationships among sediment and planktonic PCB
concentrations and water chemistry in several southern Ontario lakes 2289

GUNKEL, G.: Quantification and evaluation of toxic substances in
limnic systems 2294

PLUTA, H.-J. & HANSEN, P.-D.: Assessment of environmental health by
using sublethal bioassays and medium scale experiments 2300

MAILHOT, H. & PETERS, R. H.: Short-term sorption of chlorinated
benzenes by concentrated seston 2302

KÖHLER, R. H.: A complex seminatural outdoor-model ecosystem: Effects
of Lindane (gamma-HCH) (Abstract) 2307

HANSEN, P.-D.: Workshop on ecotoxicology 2308

KERSTING, K.: Microecosystem state and its response to the
introduction of a pesticide 2309

GIESY,J. P. & HOKE, R. A.: Bioassessment of thetoxicity of freshwater
sediment 2313

ZIERIS, F.-J.: Means and problems of the ecotoxicological test with
artificial aquatic ecosystems 2322

SOARES, A. M. V. M., BAIRD, D. J., BARBER, I., BRADLEY, M. & CALOW,
P.: Variation in chronic stress-tolerance among artificial
clone-populations of Daphnia magna STRAWS: An ecophysiological study
(Abstract) 2326

NOWAK, B. & SUNDERAM, R.I. M.: Toxicity and bioaccumulation of
endosulfan to mosquitofish, Gambusia affinis (BAIRD & GIRARD) 2327

X. Applied Limnology. 3. Radioactivity

CORNETT, R. J. & RISTO, B. A.: Transport of HTO and 90Sr through lake
sediments by advection and diffusion 2330

EVANS, R. D.: The impact of sediment focusing on total residual 210Pb:
Implications for choice of a dating model 2335

VEZINA, A. F. & CORNETT, R. J.: Radiotracer exchange between water and
sediments over different time scales: An analysis of radiocobalt
cycling (Abstract) 2340

HUBEL, K., SÄNGER, W. & LÜNSMANN, W.: Modelling of the behaviour of
radionuclides in lake ecosystems 2341

BLAKAR, I. A. & HONGVE, D.: Chernobyl cesium deposition in the
sediment of a Norwegian lake (Abstract) 2344

BRITTAIN, J. E., STORRUSTE, A. & LARSEN, E.: Radiocesium in brown
trout (Salmo trutta) from a subalpine lake ecosystem after the
Chernobyl reactor accident (Abstract) 2345

SÄRKKÄ, J., LUUKKO, A., HORPPILA, P., JÄMSÄ, A. & VALTONEN, T.:
Chernobyl cesium fallout in the sediment and fish of lakes of
different sizes in Finland 2346

FOULQUIER, L., DESCAMPS, B., LAMBRECHTS, A. & PALLY, M.: Analyse et
evolution de l'impact de l'accident de Tchernobyl sur le fleuve Rhône
2352

XI. Fish and Fisheries

JANSEN, W. A. & MACKAY, W. C.: Body composition and reproductive
investment of stunted yellow perch, Perca Javescens 2356

WARD, F. J. & MCCULLOCH, B. R.: Relationship between mouth gape of
juvenile walleye (Stizostedion vitreum vltreum) and prey size 2362

WHITESIDE, M. C.: Size-restrictive predation: Impacts on zooplankton
communities (Abstract) 2365

WU, L. & CULVER, D. A.: Age-0 yellow perch (Perca flavescens) dietary
ontogeny in the western basin of Lake Erie: Effect of midsummer
decline in zooplankton populations 2366

O'BRIEN, W. J. & EVANS, B. I.: Saltatory search behavior in five
species of planktivorous fish 2371

GHAN, D. & SPRULES, W. G.: Distribution and abundance of larval and
juvenile burbot (Lota lota) in Oneida Lake, New York 2377

DRENNER, R. W. & SMITH, J. D.: Biomass-dependent effects of
mosquitofish on zooplankton, chlorophyll and the size distribution of
particulate phosphorus 2382

KOKSVIK, J. I. & REINERTSEN, H.: Effects of fish elimination on the
plankton community of a lake used in fish farming 2387

JENSEN,J. W.: A model for the maximum growth of brown trout (Salmo
trutta L.) 2393

HEGGENES, J., BRABRAND,A. & SALTVEIT, S. J.: Determination of
microhabitat preference and utilization in juvenile brown trout (Salmo
trutta) and Atlantic salmon (& salar) in a river using two different
sampling methods (Abstract) 2400

MARTTUNEN, M. & VIRTANEN, M.: A system model for effects of lake
regulation on fish stocks 2401

TONN, W. M., PASZKOWSKI, C. A. & HOLOPAINEN, I. J.: Selective
piscivory by perch: Effects of predator size, prey size, and prey
species 2406

HOLOPAINEN, I. J., TONN, W. M. & PASZKOWSKI, C. A.: Ecological
responses of crucian carp populations to predation by perch in a
manipulated pond 2412

VILJANEN, M. & KOHO, J.: The effects of egg size and incubation
conditions on life history of vendace (Coregonusalbula L.) 2418

SARVALA, J., HALSINAHO, S., HELMINEN, H., HIRVONEN, A., KIISKILÄ, M.,
MIINALAINEN, M. & SAARIKARI, V.: Intraspecific food competition
between age groups in vendace, Coregonus albula (L.) (Abstract) 2424

RASK, M.: Changes in fish population structure of some acidified lakes
of southern Finland during a three year period 2425

GRANADO-LORENCIO, C.: Fish communities of Spanish reservoir systems: A
non-deterministic approach 2428

PERSAT, H.: The efficiency of electric fishing in fish population
studies: An experiment on grayling (Thymallus thymallus) 2432

PONT, D., CRIVELLI, A. J. & GUILLOT, F.: The effect of colonization of
three-spired sticklebacks on the heleoplankton in a fish-free pool
(Abstract) 2437

BOERSMA, M., VAN DENSEN, W. L. T. & VIJVERBERG, J.: The effect of
predation by smelt (Osmerus eperlanus) on Daptnia hyahna in a shallow
eutrophic lake 2438

GRIMM, M. P.: Water quantity management in Dutch polders, adversely
affecting the recruitment of northern pike (Esox lucius L.) 2443

SCHEFFEL, H.-J. & SCHIRMER, M.: Larvae and juveniles of freshwater and
euryhaline fishes in the tidal River Weser at Bremen, FRG 2446

VENTLING-SCHIVANK, A. & MÜLLER, R.: Survival of coregonid
(Coregonussp.) eggs in Lake Sempach, Switzerland 2451

LELEK, A.: The predator-prey relationship in the fish community of the
Rhine River 2455

PUSCH, M. & ECKMANN, R.: Growth patterns of whitefish (Coregonus
lavaretus L.) in Lake Constance derived from otolith microstructures 2461

ECKMANN, R. & PUSCH, M.: At what life stage is year-class strength of
coregonids (Coregonus lavaretus L.) in Lake Constance determined? 2465

SEGNER, H., GEBHARDT, H., LINNENBACH, M., MARTHALER, R. & NESS, A.:
Influence of low pH on brown trout, Salmo trutta 2470

NESS, A.: Computer aided individual identification of brown trout
(Salmo trutta f.fario) 2474

BRAUNBECK, T. & VÖLKL, A.: Applications of experimental histology and
cytology in the diagnosis of fish kills after chemical spills
(Abstract) 2477

MAST, P.-G. & GUNKEL, G.: Residue of polychlorinated biphenyls in fish
of limnic systems in urban areas 2478

ENNDORF, J. & MIERSCH, U.: Phosphorus loading and efficiency of
biomanipulation 2482

WALTER, G., SEDLACZEK, J. & ODENING, K.: Okoparasitologische Aspekte
in aquatischen Ökosystemen der Fischproduktion 2489

ZALEWSKI, M., PUCHALSKI, W., FRANKIEWICZ, P. & NOWAK, M.: The relation
between primary and fish biomass distribution in an upland river
system 2493

SCHIEMER, F., SPINDLER, T., WINTERSBERGER, H., SCHNEIDER, A. &
CHOVANEC, A.: Fish fry associations: Important indicators for the
ecological status of large rivers 2497

HERZIG-STRASCHIL, B.: Rare and endangered fishes of Austria 2501

VRANOVSKY, M.: Zooplankton of a Danube side arm under regulated
ichthyocoenosis conditions 2505

PERENYI, M. & BIRO, P.: Yield and recruit estimates of razor fish
(Pelecus cultratus L.) in Lake Balaton 2509

BIRO, P.: Food resource partitioning between bream (Abramis brama) and
razor fish (Pelecus cultratus) in Lake Balaton (Hungary) 2513

PAULOVITS, G. & BIRO, P.: Hydroacoustic studies on fish stock
distribution in Lake Balaton 2517

TATRAI, I., PADISAK, J. & ASCHOT, S.: Impact of juvenile cyprinid fish
predation on the food availability and zooplankton community 2519

GYANO, A. & PAPP, E.: Quality of waters utilized by Hungarian
fisheries (Abstract) 2523

BACALBASA-DOBROVICI, N.: Fish population evolution (1985-1988) in the
last Danube built Reservoir Iron Gates II 2524

MIRON, I.: The effect of the reef of the first floating salmonid farm
on the Bicaz Reservoir 2528

WOYNAROVICH, E.: The hydroelectric power plants andthefish fauna 2531

GOPHEN, M., WALLINE, P. D. & AZOULAY, B.: Associations between larval
sardines and Peridinium patches in Lake Kinneret (Israel) 2537

KNUD-HANSEN, C. F., McNASS, C. D. & BATTERSON, T. R.: Application of
limnology for efficient nutrient utilization in tropical pond
aquaculture 2541

ARUMUGAM, P. T.: Puntius gonionotus fry - plankton interactions in the
BPC hatchery tank system, UPM, Malaysia 2544

BUGENYI, F. W. B.: Ecotones in a changing environment: Management of
adjacent wetlands for fisheries production m the tropics 2547

MOREAU, J., MUNYANDORERO, J. & NYAKAGENI, B.: Evaluation des
parametres demographiques chez, thrissa tanganyhae et Limnothrissa
miodon du lac Tanganyka 2552

PUSEY, B. J. & ARTHINGTON, A. H.: The utility and applicability of the
in-stream flow incremental methodology (IFIM) for Australian lotic
environments (Abstract) 2559

NOWAK, B.: Accumulation of endosulfan by catfish after acute exposure
to sublethal concentrations 2560

SUNAGA, T. & VERANI, J. R.: The fish communities of the lakes in Rio
Doce Valley, Northeast Brazil 2563

XII. Ecology of Aquatic Organisms. 1. Microbes

LAMMERS, W. T.: Bacterial hosts of bacteriophage isolated from river
sediment 2567

REISSER, W.: Characteristics and ecology of viruses attacking
eukaryotic freshwater algae 2569

TREMAINE, S. C. & MILLS, A. L.: The role of sediment microbial food
webs in the recovery of acidified lakes (Abstract) 2574

SUNDH, I.: Bacterioplankton utilization of high and low molecular
weight extracellular dissolved organic carbon released from
phytoplankton (Abstract) 2575

VAN DE BUND, W. J., GOEDKOOP, W. & JOHNSON, R. K.: Effects of deposit
feeding on the abundance and production of sediment bacteria
(Abstract) 2576

BOSTROM, B.: Microbial activity in sediments of a shallow, highly
eutrophic lake following the sedimentation of a spring diatom bloom
(Abstract) 2577

MÜNSTER, U., EINIÖ, P. & NURMINEN, J.: Exoenzyme activities in
lacustrine environments and their relation to substrate composition
(Abstract) 2578

LAVANDER, P.: Bacterial production estimates in a mesotrophic
reservoir (Lake Pareloup, France) (Abstract) 2579

STROFFEK, S. & DUFOUR, P.: Degradation of settling organic particles
in surface waters of Lake Leman: The role of planktonic bacteria 2580

SIMON, M., CHO, B. C. & AZAM, F.: Relationships of bacterial biomass
to phytoplankton biomass and particulate organic matter in pelagic
ecosystems (Abstract) 2584

SCHUCHARDT, B. & BUSCH, D.: Seasonal and spatial variations in cell
numbers of attached and free-living bacteria in the innerpart of the
Weser Estuary 2585

HÖFLE, M. G.: RNA chemotaxonomy of aquatic bacteria - solution of a
dilemma in microbial ecology? (Abstract) 2591

MEIER, B., FUXAMI, K. & OVERBECK, J.: Vertical and serial changes in
bacterial production and its consumption by heterotrophic flagellates
in a North German lake (Abstract) 2592

SCH0TT, C.: Ecogenetics: A new concept of aquatic microbial ecology at
genetical level 2593

CHROST, R.J.: Ectoenzymes in aquatic environments: Microbial
strategy for substrate supply 2597

SCHRÖDER, D. & KRAMBECK, H.-J.: Advances in digital image analysis of
bacterioplankton with epifluorescence microscopy 2601

PSENNER, R.: Determination of bacterial cell volumes by image analysis
2605

SCHIEWER, U.: Bottom-up regulation of food webs in shallow Baltic
estuaries 2609

HADAS, O., PINKAS, R. & BERMAN, T.: Relationships between bacteria
and protozoa from Lake Kinneret (Abstract) 2612

BABENZIEN, H.-D., CASPER, P. & BABENZIEN, CH.: Bacterial processes in
sediments: Comparative studies in the Lake Stechlin area 2613

ANTONIETTI, R. & TOMASELLI, L.: Effects of changes in extracellular pH
on ATP pools of some prokaryotic and eukaryotic microorganisms 2618

HOLFELD, H.: Parasitic fungi infecting planktonic algae (Abstract) 2621

XII. Ecology of Aquatic Organisms. 2. Algae and Macrophyta

YASUNO, M. & SUGAYA, Y.: Toxicities of Microcystis viridis and the
isolated hepatotoxic polypeptides on cladocerans 2622

STEINER, H., SCHILLING, N. & DITTRICH, P.: Physiological response of
algae to treatment with nitrilotriacetic acid 2627

KRISTIANSEN, J. & TONG, D.: Investigations on silica-scaled
chrysophytes in China 2630

VEEN, A.: Dinohryon divergens: A new culture device and the
quantification of its phagotrophy (Abstract) 2634

GENSEMER, R. W.: The effects of aluminum on phosphorus and
silica-limited growth in Asterionella ralisii var. amertcana 2635

OHTSUKA, H., FUKUSHIMA, H., KO-BAYASHI, T. & YOSHITAKE, S.:
Morphological variability of Cymbella microcephala (Pennate diatom) 2640

BOLIER, G., TER KUILE-DE BOER, I. M. & DONZE, M.: A discrepancy in the
measurement and interpretation of Si- and P-dependent maximum growth
rate in cultures of diatoms 2644

KOUWE, F. A. & VAN DER AALST, P. L. J.: Introduction of a system using
diatoms to assess the oxygen condition of surface waters 2647

KOHL, J.-G. & GIERSDORF, K.: Competition ability of two planktic
diatoms under different vertical light gradients, mixing-depth and
-frequencies: An experimental approach 2652

ELORANTA, P. & JÄRVINEN, M.: Growth of Gonyostomum semen (EHR.)
DIESING (Raphidophyceae): Results from culture experiments 2657

SHAFIK, H. M. & HERODEK, S.: A continuous culture study of the growth
rate and phosphate uptake of Scenedesmus spinosus (Abstract) 2660

GROVER, J. P.: Algae grown in non-steady continuous culture:
Population dynamics and phosphorus uptake 2661

SCHILLING, N., REISSER, W. & DITTRICH, P.: Stimulation of maltose
excretion by phosphate in the endocytobiotic Chlorella s p. of
Paramecium bursaria 2665

BROCK, M. A. & CASANOVA, M. T.: Plant survival in temporary waters: A
comparison of charophytes and angiosperms 2668

GUERLESQUIN, M., COUTE, A. & VAQUER, A.: Studies about the family of
the Characeae from the Guyanas 2673

BRADE, S. A. & MANTAI, K. E.: Nitrate reductase in aquatic macrophytes 2678

SVEDÄNG, M. U.: Carbon dioxide as a factor regulating the growth of
Juncus bulbosus L. (Abstract) 2681