Shallow Lakes '98

Developments in Hydrobiology 143

Series editor H. J. Dumont

Shallow Lakes '98

Trophic Interactions in Shallow Freshwater and Brackish Waterbodies

Edited by

N. Walz and B. Nixdorf

Reprinted from Hydrobiologia, volumes 408/409 (1999)

• ' Springer-Science+Business Media, B.V.

Library of Congress Cataloging-in-Publication Data

A C. J.P. Catalogue record for this book is available from the Library of Congress.

ISBN 978-90-481-5370-1 ISBN 978-94-017-2986-4 (eBook) DOI 10.1007/978-94-017-2986-4

Printed on acid-free paper

All Rights reserved © 1999 Springer Science+ Business Media Dordrecht Originally published by Kluwer Academic Publishers in 1999 Softcover reprint of the hardcover 1st edition 1999

No part of the material protected by this copyright notice may be reproduced

or utilized in any form or by any means, electronic or mechanical,

including photocopying, recording or by any information storage and

retrieval system, without written permission from the copyright owner.

..._. Hydrobiologia 408/409: v-viii, 1999.

' ' N. Walz & B. Nixdorf(eds), Shallow Lakes '98

Contents

Preface ......................................................................... .

List of Participants ............................................................... .

Littoral-pelagic interactions and management

Restoring nutrient-enriched shallow lakes: integration of theory and practice in the Norfolk Broads, U.K.

by F. J. Madgwick ......................................................... . Biomanipulation in shallow lakes in The Netherlands: an evaluation of 18 case studies

by Marie-Louise Meijer, Ingeborg de Boois, Marten Scheffer, Rob Portielje & Harry Hosper .................................................................... .

Reduction of Microcystis blooms in a hypertrophic reservoir by a combined ecotechnolo­gical strategy

by Thomas Deppe, Klaus Ockenfeld, Andreas Meybohm, Michael Opitz & Ji.irgen Benndorf .................................................................. .

Predation by piscivorous fish on age-0 fish: spatial and temporal variability in a biomanip­ulated lake (Bautzen reservoir, Germany)

by Hendrik Dorner, Annekatrin Wagner & Ji.irgen Benndorf ..................... . Cannibalism as a regulatory force of pikeperch, Stizostedion lucioperca (L.), population dynamics in the lowland Sulejow reservoir (Central Poland)

by P. Frankiewicz, K. Dabrowski, A. Martyniak & M. Zalewski ................ . Is the difference in population dynamics of Daphnia galeata in littoral and pelagic areas of a long-term biomanipulated reservoir affected by age-0 fish predation?

by Stephan Hi.ilsmann, Thomas Mehner, Susanne Worischka & Matthias Plewa .... A comparative study on the feeding of eel, Anguilla anguilla (L.), bream, Abramis brama (L.) and ruffe, Gymnocephalus cernuus (L.) in Lake V6rtsjarv, Estonia

by Ki.illi Kangur, Andu Kangur & Peeter Kangur .............................. . The role of benthivorous and planktivorous fish in a meso trophic lake ecosystem

by Juha Karjalainen, Markus Leppa, Minna Rahkola & Kimmo Tolonen ......... . The stability of fish communities in shallow lakes undergoing restoration: expectations and experiences from the Norfolk Broads (U.K.)

by M.R. Perrow, A.J.D. Jowitt, S.A.C. Leigh, A.M. Hindes & J.D. Rhodes ....... . Habitat use and recruitment: a comparison of long-term recruitment patterns among fish species in a shallow eutrophic lake, Oneida Lake, NY, U.S.A.

by Spencer R. Hall & Lars G. Rudstam ....................................... . Utilization of natural and artificial habitats by YOY pike in a biomanipulated lake

by Christian Skov & Soren Berg ............................................. .

v

ix

xi-xviii

1-12

13-30

31-38

39-46

47-55

57-63

65-72

73-84

85-100

101-113

115-122

vi

Feeding habits of two introduced fish species (Lepomis gibbosus, Pseudorasbora parva) in Neusiedler See (Austria), with special reference to chironomid larvae (Diptera: Chironom­idae)

by Anita Wolfram-Wais, Georg Wolfram, Brigitte Auer, Ernst Mikschi & Arno Hain Direct and indirect effects of carp ( Cyprinus carpio L.) on macrophyte and benthic com­munities in experimental shallow ponds in Central Mexico

by Luis Zambrano & Demian Hinojosa ....................................... . Neutral network models as a management tool in lakes

by Ctineyt Karul, Sel<;uk Soyupak & Co~kun Yurteri ........................... .

Sediments and Benthos

Internal phosphorus loading in shallow Danish lakes by Martin Sondergaard, Jens Peder Jensen & Erik Jeppesen ..................... .

Hydrothermodynamic features of mass exchange across the sediment-water interface in shallow lakes

by Sergey D. Golosov & Natalia V. Ignatieva ................................. . The N and P budget of the shallow, flushed lake Mtiggelsee: retention, external and internal load

by Hans-Peter Kozerski, Horst Behrendt & Jan Kohler ......................... . Horizontal distribution of sediment phosphorus in shallow eutrophic Lake V6rtsjarv (Esto­nia)

by Peeter N6ges & Anu Kisand ............................................. . Comparison of phosphorus release from littoral and profunda} sediments in a shallow, eu­trophic lake

by Frede 0. Andersen & Peter Ring .......................................... . Surficial sediment composition as a record of environmental changes in the catchment of shallow Lake Petersdorf, Brandenburg, Germany

by Andreas Kleeberg, Doris Jendritzki & Brigitte Nixdorf ...................... . The zoobenthic community of shallow salt pans in Austria -preliminary results on pheno­logy and the impact of salinity on benthic invertebrates

by Georg Wolfram, Karl Donabaum, Michael Schagerl & Verena A. Kowarc ..... . Diversity of invertebrate fauna in littoral of shallow Myczkowce dam reservoir in compar­ison with a deep Solina dam reservoir

by Tadeusz Prus, Miroslawa Prus & Pawel Bijok .............................. . Effect of hydrodynamic factors on benthic communities in Lake Kinneret

by B. Shteinman, Y. Kamenir & M. Gophen ................................... .

Plankton in shallow lakes

Trophic dynamics in turbid and clearwater lakes with special emphasis on the role of zo­oplankton for water clarity

by Erik Jeppesen, Jens Peder Jensen, Martin Sondergaard & Torben Lauridsen ....

123-129

131-138

139-144

145-152

153-157

159-166

167-174

175-183

185-192

193-202

203-210

211-216

217-231

Plankton dynamics in a river-lake system- on continuity and discontinuity by Martin Welker & Norbert Walz ........................................... .

Diel variation on horizontal distribution of Daphnia and Ceriodaphnia in oligotrophic and mesotrophic lakes with contrasting fish densities

by Torben L. Lauridsen, Erik Jeppesen, Stuart F. Mitchell, David M. Lodge & Romi L. Burks .................................................................. .

On the occurrence of clear-water phases in relation to shallowness and trophic state: a comparative study

by Rainer Deneke & Brigitte Nixdorf ......................................... . Hepatotoxic cyanobacteria in the shallow lake Miiggelsee

by Martin Welker, Sigrid Hoeg & Christian Steinberg .......................... . Spring phytoplankton dynamics in a shallow eutrophic lake

by Mechthild Schmitt & Brigitte Nixdorf ..................................... . The effect of extreme water level decrease on hydrochemistry and phytoplankton in a shal­low eutrophic lake

by Tiina Noges & Peeter Noges ............................................. . Comparison of the areal amount of chlorophyll a of planktonic and attached microalgae in a shallow coastal lagoon

by D. Conde, S. Bonilla, L. Aubriot, R. de Le6n & W. Pintos ................... . Lake Plessa 107 (Lusatia, Germany)- an extremely acidic shallow mining lake

by Dieter Lessmann, Rainer Deneke, Remo Ender, Mike Hemm, Maria Kapfer, Hartwig Krumbeck, Kathrin Wollmann & Brigitte Nixdorf ..................... .

Autotrophic picoplankton dynamics in a small shallow lake by Elzbieta Sze!C}.g-Wasielewska ............................................. .

Macrophytes

The effect of aquatic vegetation on turbidity; how important are the filter feeders? by Marten Scheffer ......................................................... .

Nutrient content in macrophytes in Spanish shallow lakes by Margarita Ferml.ndez-Ahl.ez, Camino Fernandez-Alaez & Eloy Becares ....... .

The phytosociological characteristic and habitat requirements of the Phragmitetum com­munis (Gams 1927) Schmale 1939 phytocoenoses in the lakes ofthe Wielkopolski National Park

by Mariusz Pelechaty ...................................................... . Dynamics and stability of Chara sp. and Potamogeton pectinatus in a shallow lake changing in eutrophication level

by MarcelS. Van den Berg, Marten Scheffer, Egbert Van Nes & Hugo Coops ..... Internal and external nutrient cycles in stands of Phragmites australis - a model for two ecotypes

by Indra Lippert, Hardy Rolletschek, Harald Kiihl & Johannes-Gunter Kohl ...... .

vii

233-239

241-250

251-262

263-268

269-276

277-283

285-291

293-299

301-306

307-316

317-326

327-334

335-342

343-348

viii

Nutrient loading and dynamics

Shallow lakes in lowland river systems: Role in transport and transformations of nutrients and in biological diversity

by Anna Hillbricht-Ilkowska ................................................ . Multi-lake studies in The Netherlands: trends in eutrophication

by D.T. Vander Molen & R. Portielje ........................................ . Problems in estimating phytoplankton nitrogen limitation in Shallow Eutrophic Lakes

by Guntram Weithoff & Norbert Walz ........................................ . Relationship between eutrophication variables: from nutrient loading to transparency

by R. Portielje & D. T. Vander Molen ....................................... . Dimictic versus polymictic masurian lakes: similarities and differences in chlorophyll­nutrients-SD relationships

by Lech Kufel ............................................................. .

349-358

359-365

367-373

375-387

389-394

Hydrobiologia 408/409: ix, 1999. N. Walz & B. Nixdorf(eds), Shallow Lakes '98 ix

Preface

This volume is the end-product of "Shallow Lakes 98", an International Conference on: "Trophic Interactions in Shallow Freshwater and Brackish Waterbodies" held from 3- 8 August 1998 in Blossin near Berlin (Germany) and stands in the tradition of former meetings in Silkeborg ( 1992) and Mikolajki ( 1995). The conference in Blossin was organised by the Institute of Freshwater Ecology and Inland Fisheries (IGB Berlin) and the Technical University Cottbus (BTUC). It was attended by more than 150 participants from about 20 countries. With a grant from the "Deutsche Forschungsgemeinschaft" several participants from mid- and east European countries could be invited. The conference was further supported by the State Office of Environment (Brandenburg).

The organisers tried to offer a meeting with an acceptable price and tried to establish a good working atmo­sphere. We hope that the participants judged these efforts a success. However, this was only a precondition for good contributions and discussions for which this volume is a testimony. Much experience was presented on the verification of the dual-stable states of shallow lakes, a growing number of lakes have been studied and many factors were reported which could have an influence on feed-back controls. Although the knowledge about responses to nutrient reduction measures and biomanipulation has been growing in the last decade, little is known about ways of re-establishing macrophyte communities in eutrophic lakes. Most of these lakes have lost these communities in the past and one aim is to transform these lakes from a turbid to a clear water state with macrophyte stands. Also management practices are generating new theories on lake ecosystem functioning. Therefore, management aspects have not been separated from more theoretical papers in this volume.

The conference was structured into different topics: Macrophytes, Nutrient loading, Phytoplankton, Littoral­pelagic interactions, Zooplankton, Management, Benthos, and Sediment-water interactions. Many topics were introduced by the following keynote speakers: A. Hillbricht-Ilkowska, B. Kronvang, L. Mur, L. G. Rudstam, R. Reddy, J. Padisak, J. Madgwick, and A Herzig.

We are thankful to the organising committee which was also responsible for the review process of the manu­scripts. We are greatly indebted to: Rita Adrian, Horst Behrendt, Ji:irg Gelbrecht, Frank Gervais, Michael Hupfer, Thomas Mehner, Andreas Nicklisch, Hendrik Schubert, Christian Steinberg. Numerous other people helped in different ways in the organisation, to give prominence only to Katrin Lehmann, Beate Muller (secretary) and Hans-Peter Kozerski for organisation of the unforgettable canoe races on Wolziger See. The "Shallow Lakes 2001" conference will take place in Hungary at Lake Balaton.

BRIGITTE NIXDORF

NORBERT WALZ

Guest Editors

lilo.AI Hydrobiologia 408/409: xi-xviii, 1999.

' ' N. Wa/z & B. Nixdorf(eds), Shallow Lakes '98

List of participants

Rita ADRIAN, Institut fiir Gewasserokologie und Binnenfischerei, Miiggelseedamm 260, D-12587 Berlin, Germany adrian@ igb-berlin.de

Frede ANDERSEN, Institute of Biology, Odense Uni­versity, Campusvej 55, DK-5230 Odense M, Den­mark foa@biology.ou.dk

Wolfgang ARP, Liitticher Str. 4, 13353 Berlin, Ger­many Wolfgang.arp@metronet.de

Mandy BAHNWART, Universitat Rostock, FB Biolo­gie, Allgemeine u. Spezielle Botanik, Wismarsche Str. 8, 18051 Rostock, Germany mb@bpserv.bio1.uni-rostock.de

Eloy BECARES, Department of Ecology, University of Leon. Campus de Vegazana, 24071 Leon, Es­pana degebm @unileon.es

Horst BEHRENDT, Institut fiir Gewasserokologie und Binnenfischerei, SeestraBe 82, D-12589 Berlin, Germany behrendt@ igb-berlin.de

Meryem BEKLIOGLU, Middle East Technical Uni­versity, Biology Department 06531, Ankara, Tur­key meryem @wasp.bio.metu.edu.tr

Victor BELIAKOV, Institute of Lake Research RAS, Sevastianova str. 9, 196199, St.Petersburg, Russia viktorb @mail. wplus.net

S0ren BERG, Danish Institute for Fisheries Research, Department oflnland Fisheries, Vejls!l)vej 39, DK-8600 Silkeborg, Denmark SBE@dfu.min.dk

XI

Sybille BERGHOFF, University of Rostock, De­partment of Biology, Freiligrathstr. 7-8,18051 Rostock, Germany

Talya BERGSTEIN BEN-DAN, Kinneret Limnol. Lab. P.O.B. 345, Tiberias 14102, Israel talyab@ocean.org.il

Pawel BIJOK, International Centre of Ecology, Polish Academy of Sciences, Dziekanow Lesny, 05-092 Lomianki, Poland ekolog@ warman.com. pi

Irmgard BLINDOW, Limnology, Department of Eco­logy, Ecology Building, S-223 62 Lund, Sweden Irmgard.Blindow@ limnol.lu.se

S. BONILLA, Limnology section - Faculty of Sci­ences, University of Uruguay, IGUA SN, 11400-Montevideo, Uruguay

Ingeborg DE BOOTS, RIZA, P.O. Box 17, 8200 AA Lelystad, The Netherlands i.dboois @riza.rws.minvenw.nl

Lubomira BURCHARDT, Zaklad Hydrobiologii, Uni­versytet im A. Mickiewicza, ul.Marcelinska 4, 60-801 Poznan, Poland

Romi BURKS, Department of Biological Sciences, Ecology, Evolution and Environmental Biology, University of Notre Dame, Notre Dame, IN 46556, USA Romi.L.Burks.6 @nd.edu

Ana Cristina CARDOSO, Directorate General JRC, Environment Institute, TP 290, I-21020 Ispra (VA), Italy ana-cristina-cordoso@ j n.it

Slawomir CERBINA, Hydrobiol. Department Adam Mickiewicz University, Marcelinska 4, 60-801 Poznan, Poland

xii

Guisepp CHIAUDANI, Directorate General JRC, En­vironment Institute, TP 290, 1-21020 Ispra (VA), Italy

Kasper CHRISTENSEN, lnst. of Biology, Odense University, Campusvej 55, DK-5230 Odense M, Denmark kasper@dou.dk

Daniel Scalone CONDE, Limnology section - Faculty of Sciences, University of Uruguay, IGUA SN, 11400-Montevideo, Uruguay vlad@fcien.edu.uy

Hugo COOPS, RIZA, P.O. Box 17, 8200 AA Lelystad, The Netherlands h.coops@riza.rws.minvenw.nl

Beata DABROWSKA, Department of Botany and Ecology, University of Technology and Agricul­ture, 85-796 Bydgoszcz, ul. Kaliski ego 7, Poland be a @mail.atr. bydgoszcz. pl

Rainer DENEKE, Brandenburg Technical University of Cottbus, Chair of Water Conservation, Seestr. 45, D-15526 Bad Saarow, Germany RDeneke @t -online.de

Thomas DEPPE, Technische Universitaet Dresden, lnstitut fuer Hydrobiologie, 01062 Dresden, Ger­many deppe@rmhs2.urz.tu-dresden.de

Wojciech DONDERSKI, Nicholas Copernicus Univ., Inst. of Biology and Environment Protection, Gagarina 9, 87-100 Torun, Poland

H. DORNER, Institut fiir Hydrobiologie, TU Dresden, Zellescher Weg 40,01062 Dresden, Germany hdoerner@ res. urz. tu -dresden. de

Eva DRIESCHER, Institut fiir Gewassertikologie und Binnenfischerei, Mtiggelseedamm 260, D-12587 Berlin, Germany driescher@ ig b-berlin. de

Jolanta EJSMONT-KARABIN, Institute of Ecology, Polish Academy of Sciences Hydrobiological Sta­tion, Lesna13, 11-730 Mikolajki, Poland

Peder ERIKSSON, Limnology, Dep. of Ecology, Eco­logy Building, S-223 62 Lund, Sweden John.Strand@limnol.lu.se

Susen ESTRUM-YOUSEF, University Rostock, De­partment of Biology, Freiligrathstr. 7-8, 18055 Rostock, Germany se@frserv.bio3.uni-rostock.de

Hans-Jtirgen EXNER, Institut fiir Gewasserokologie und Binnenfischerei, Mtiggelseedamm 260, D-12587 Berlin, Germany exner@igb-berlin.de

Piotr FRANKIEWICZ, Department of Applied Eco­logy, University of Lodz, 90-237 Lodz, ul. Banacha 12/16, Poland mzal @biol.uni.lodz.pl

Janusz FYDA, Jagiellonia University, Institute of En­vironmental Biology, Department of Hydrobio­logy, ul. Oleandry 2a 30-063 Krakow, Poland fyda@eko.uj.edu.pl

Tobias GARSTECKI, Universitaet zu Koln, Zoolo­gisches Institut, Weyertal 119, D-50923 Ktiln, Germany tgarstec@ biolan. uni-koeln.de

Jtirg GELBRECHT, Institut fiir Gewassertikologie und Binnenfischerei, Mtiggelseedamm 260, D-12587 Berlin, Germany gelbr@igb-berlin.de

Frank GERVAIS, Alfred-Wegener-Institut fiir Polar­und Meeresforschung, Postfach 12 01 61, 27515 Bremerhaven, Germany fgervais@ awi. bremerhaven.de

Andrzej GIZINSKI, Nicholas Copernicus University, Inst. Ecology Environment, Protection, Dept. Hy­drobiology, Gagarina 9, 87-100 Torun, Poland pnapiork@bio.uni.torun.pl

Ryszard GOLDYN, Department of Water Protection, Adam Mickiewicz University, Drzymaly 24, 60-613 Poznan, Poland rgold@ hum.amu.edu. pl

S.D. GOLOSOV, Institute for Lake Research of the Russian Academy of Sciences, Sevastyanov Str. 9,

196105 St. Petersburg, Russia golosov@ lake. spb. su

Moshe GOPHEN, Hula-Projekt-Kinneret Limnolo­gical Laboratory P.O.Box 345, 14102 Tiberias, Israel kli @inter.net.il

Anders HARGEBY, Limnology, Department of Eco­logy, Ecology Building, S-223 62 Lund, Sweden

Reinh. HEERKLOB, Universitat Rostock, Freiligrath Str. 7-8, FB Biologie, Rostock, Germany rh@frserv.bio.3

Alois HERZIG, Biologische Station, Neusiedler See, A-7142 Illmitz, Austria bioi. stat@ netway.at

Anna HILLBRICHT-ILKOWSKA, Institute of Eco­logy, Pol. Ac. Sciences, Dziekanow, Lesny, 05-092 Lomianki, Poland ekolog @warman.com. pi

Sven HILLE, FeldstraBe 26, 17489 Greifswald, Ger­many

Sigrid HOEG, Institut flir Gewasserokologie und Binnenfischerei, Mtiggelseedamm 260, D-12587 Berlin, Germany

Stephan HUELSMANN, Institut ftir Hydrobiologie, Technische Universitat Dresden, 01062 Dresden, Germany huelsman@rcs.urz.tu-dresden.de

Michael HUPFER, Institut fiir Gewasserokologie und Binnenfischerei, Mtiggelseedamm 256, D-12587 Berlin, Germany hupfer@igb-berlin.de

N.V. IGNATIEVA, Institute for Lake Research of the Russian Academy of Sciences, Sevastyanov Str. 9, 196105 St. Petersburg, Russia ignat@ lake.spb.su

Lene JACOBSEN, Danish Institute for Fisheries Re­search, Department of Inland Fisheries, Vejlspvej 39, DK-8600 Silkeborg, Denmark LJ @dfu.min.dk

Xlll

J.H. JANSE, RIVM-LWD, P.O. Box 1, 3720 BA Bilthoven, The Netherlands jh.janse@rivm.nl

Jens Peder JENSEN, P.O.Box 314, Vejlspvej 25, DK-8600 Silkeborg, Denmark jpj@dmu.dk

Erik JEPPESEN, National Environmental Research Instititute, Velspvej 25, Box 314, DK-8600 Silke­borg, Denmark ej@dmu.dk

Torben B. JORGENSEN, Aarhus County, Environ­mental Division, Lyseng Alle 1, 8270 Hojbjerg, Denmark ag.nm.tj @aaa.dk

A.J.D. JOWITT, ECON Ecological Consultancy, Bio­logical Sciences, University of East Anglia, Nor­wich, NR4 7T, UK m.perrow@uea.ac.uk

Zdzislaw KAJAK, Inst. of Ecology AS, Department of Hydro biology, Dziekanow Lesny near Warsaw, 05-092 Lomianki, Poland ekolog @warman.com. pl

Thomas KALETTKA, ZALF Mtincheberg, Insti­tut flir Hydrologie, Eberswalder Str. 84, 15374 Mtincheberg, Germany tkalettka@zalf.de

Jury KAMENIR, Golan Res. Inst., Haifa Univ. P.O. Box 97 Kazrin 12900, Israel rres 108 @research.haifa.ac.il

Andu KANGUR, Vortsjarv Limnological Station, EE 2454 Rannu, Estonia andu@lim.tartu.ee

Ktilli KANGUR, Vortsjarv Limnological Station, EE 2454 Rannu, Estonia andu@ lim. tartu.ee

Peeter KANGUR, Vortsjarv Limnological Station, EE 2454 Rannu, Estonia andu@lim.tartu.ee

xiv

Maria KAPFER, Lehrstuhl fiir Gewasserschutz, BTU Cottbus, SeestraBe 45, 15526 Bad Saarow, Ger­many kapschmitt@ t -online.de

Juha KARJALAINEN, Affiliation University of Joensuu, P.O. Box 111, Joensuu, Finland juha.karjalainen@ joensuu.fi

Ciineyt KARUL, Environmental Engineering Depart­ment, Middle East Technical University, Environ­mental Eng. Dpt. METU 06531 Ankara, Turkey cuneyt. @ekosis.com.tr

Andreas KLEEBERG, Brandenburg Technical Uni­versity of Cottbus, SeestraBe 45, 15526 Bad Saarow, Germany rueklee@t-online.de

Katja KLEMM, Universitat Koln, Germany

Axel KLINK, Spielmoos 18, 88161 Lindenberg, Ger­many grp-wternet@ lfuka. urn. bw l. de

Jan KOEHLER, Institut fiir Gewasserokologie und Binnenfischerei, SeestraBe 82, D-12589 Berlin, Germany koehler@igb-berlin.de

Mikolaj KOKOCINSKI, Zaklad Hydrobiologii, Univ. im A. Mickiewiczc, ul. Marcelinska 4, 60-801 Poznan, Poland

Ilona KORCZYNSKI, LAUN Mecklenburg-Vorp., Seenprojekt M-V, Pampower Str. 66-68, 19061 Schwerin, Germany

Hans-Peter KOZERSKI, Institut fiir Gewasserokolo­gie und Binnenfischerei, SeestraBe 82, D-12589 Berlin, Germany kozerski @igb-berlin.de

Brian KRONVANG, National Environmental Re­search Institute, Vejls0vej 25, Postboks 314, 8600 Silkeborg, Denmark bkr@dmu.dk

Natalia KUCZYNSKA-KIPPEN, Hydrobiology De­partment, A. Mickiewicz Univ., Marcelinska 4, 60-801 Poznan, Poland

Lech KUFEL, Polish Academy of Sciences, Inst. of Ecology, Dziekanow Lesny, 05-092 Lomianki, Po­land lkuf@polbox.com

Friedrike KUNZ, Feldstr. 26, 17489 Greifswald, Ger­many kunzf@rz. uni.greifswald.de

Evgenij KURASHOV, Inst. of Limnology, Sevastyan­ova Street 9, 196199 St. Petersburg, Russia kurashov@ lake. spb.su

Torben LAURIDSEN, The National Environmental Research Institute, Vejls0vej 25, DK-8600 Silke­borg, Denmark tll@dmu.dk

Joep J. de LEEUW, Fish Culture and Fisheries, P.O. Box 338, 6700 AH Wageningen, The Netherlands joep.deleeuw@alg.venv.wan.nl

Dieter LESSMANN, BTU Cottbus, Lehrstuhl fiir Gewasserschutz, Postfach 101344, 03013 Cottbus, Germany lessmann@ neptun.hydrologie. tu.-cottbus.de

Klaus LEUSCHNER, Institut fur Gewasserokologie und Binnenfischerei, SeestraBe 82, D-12589 Ber­lin, Germany leusch @igb-berlin.de

Indra LIPPERT, Humboldt-Univ. Berlin, Mathemat.­Naturwiss. Fakultat, Inst. f. Biol., AG Okologie, Unter den Linden 6, 10099 Berlin, Germany

Herbert LOFFLER, Inst. for Lake Research Envir­onmental Protection Agency Baden-Wiirtemberg Untere Seestr. 81, 88085 Langenargen, Germany grp-intemet@fluka.um.bwl.de

Jane MADGWICK, WWF Denmark, Ryegaede 3F, DK-2200 Copenhagen, Denmark j.madgwick@wwf.dk

Ola MARKLUND, Limnologiska avdelningen Ekolo­gihuset, brnvagen 68, S-223 62 Lund, Sweden ola.marklund@limnol.lu.se

Jiirgen MATHES, LAUN Mecklenburg-Vorp., Seen­projekt M-V, Pampower Str. 66-68, 19061 Schwerin, Germany

Thomas MEHNER, Institut fiir Gewasserokologie und Binnenfischerei, Mtiggelseedamm 310, D-12587 Berlin, Germany mehner@ ig b-berlin. de

Marie-Louise MEIJER, RIZA, P.O. Box 17, 8200 AA Lelystad, The Netherlands m.l.meijer@riza.rws.minvenw.nl

Tomasz MIESZCZANKIN, Nicholas Copernicus Univ., Inst. Ecology, Environment Protection, Dept. Hydrobiology, Gagarina 9, 87-100 Torun, Poland pnapiork@ biol. uni. torun.pl

Ernst MIKSCH!, Naturhistorisches Museum Wien, 1. Zoo. Abt. Fischsammlung, Burgring 7, A-1014 Wien, Austria

Poul Hald MOLLER, County of Vejle, Damhaven 12, DK-7100 Vejle, Denmark pm@vejleamt.dk

Zbigniew MUDRYK, Department of Experimental Biology Univ. of Education, 76-200 Slupsk, Po­land

Wolfgang MULLER, Commerau 56, 02699 Konig­swartha, Germany 1ft-fischerei-sax @online.de

Luuc MUR, ARISE/ME Nieuwe Achtergracht 127, 1018 WS Amsterdam, The Netherlands a4171mur@chem.uva.nl

Barbara NAGENGAST, Hydrobiology Department, A. Mickiewicz Univ., Marcelinska 4, 60801 Poznan, Poland

Liubov NAGORSKAJA, Institute of Zoology, Be­larussian National Academy of Sciences 27, Aca­demitcheskaja, Minsk, 220072, Belarus zoo467 @biolbel.bas-net.by

Andreas NICKLISCH, Institut fiir Gewasserokolo­gie und Binnenfischerei, Mtiggelseedamm 260, D-12587 Berlin, Germany nicklisch@ igb-berlin. de

Brigitte NIXDORF, BTU Cottbus, Lehrstuhl fiir Gewasserschutz, PlatanenstraBe 1, 15526 Bad

Saarow, Germany b.nixdorf@t-online.de

XV

Peeter NOGES, Vortsjarv Limnological Station, Inst. of Zoology and Botany Rannu, Tartu County, EE2454, Estonia tiina@ lim. tartu.ee

Tiina NOGES, Vortsjarv Limnological Station, Inst. of Zoology and Botany Rannu, Tartu County, EE2454, Estonia tiina@ lim.tartu.ee

Klaus OCKENFELD, Institut fiir Gewasserokologie und Binnenfischerei, SeestraBe 82, D-12589 Ber­lin, Germany ockenfeld@ igb-berlin.de

Dieter OPITZ, Institut ftir Gewasserokologie und Binnenfischerei, SeestraBe 82, D-12589 Berlin, Germany opitz@igb-berlin.de

Wolfgang OSTENDORP, Ernst-Moritz-Arndt-Univ. Fachr. Biologie, Botanisches Inst. Botanischer Garten, Grimmer Str. 83, 17487 Greifswald, Ger­many ostendw@rz.uni-greiswald.de

Pawel OWSIANNY, Zaklad Hydrobiologii, Univ. im. A. Mickiewicza, ul. Mrcelinska 4, 60-801 Poznan, Poland

Teresa OZIMEK, Department of Hydrobiology, Warsaw Univ. Banacha 2, 02-097 Warszawa, Po­land Teresa@ hydro.biol. uw.edu. pl

Judit PADISAK, Balaton Limnological Institute, H-8237 Tihany, Hungary padisak @tres.blki.hu

Mariusz PELECHATY, Department of Hydrobiology, Institute of Environmental Biology UAM, Mar­celiska 4 60-801 Poznan, Poland

Martin PERROW, ECON Ecological Consultancy, School of Biological Sciences, University of East Anglia, Norwich, NR4 7TJ UK m.perrow@uea.ac.uk

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Thomas PETZOLDT, TU Dresden, Institute for Hy­drobiology, 0 I 062 Dresden, Germany petzoldt@rcs.urz.tu-dresden.de

Robert PORTIELJE, Inst. for Inland Water Manage­ment and Waste Water Treatment, Lelystad, The Netherlands r. portielje@ riza.rws .minven w.nl

Guido PREMAZZI, Directorate General JRC, Envir­onment Institute TP 290,21020 Ispra, (VA) Italy guido.premazz@ei.grc.it

Pawel PRUS, Department of Hydrobiology Institute of Ecology, Polish Academy of Sciences, Dziekanow Lesny 05-092 Lomianki, Poland ekolog@ warman.com. pl

Wojciech PUCHALSKI, Technical University of Koszalin, Dept. of Environmental Biology, ul. Raclawicka 15-17, 75-620 Koszali, Poland wpuch@ lew. tu.koszalin. pl

Kerstin RAMM, Inst. fiir angewandte Gewasseroko­logie GmbH, Grobenstr. 18-20, 14469 Potsdam, Germany gl. brb-fak. wasser@t -online.de

K. Ramesh REDDY, Wetland Biogeochemistry Labor­atory, Soil and Water Sciences Department, Uni­versity of Florida, Gainesville, FL 32611-0510, USA krr@ gnv.ifas.uft.edu

Hardy ROLLETSCHEK, Humboldt Univ. Mathemat.­Naturwiss. Fakultat, Inst. f. Biologie, AG Okolo­gie, Unter den Linden 6, 10099 Berlin, Germany rolletschek@rz.hu-berlin.de

Frank ROOZEN, Wageningen Agricultural University, Dept. of Aquatic Ecology and Water Quality Man­agement, Wageningen, The Netherlands frank.roozen@ aqec. wkao. wau.nl

Lars RUDSTAM, Cornell University Biological Field Station, 900 Shackelton Point Road, Bridgeport, NY 13030, USA LGR1 @cornell.edu

Jacqueline RUECKER, Brandenburg Technical Uni­versity Cottbus, Chair of water conservation,

Seestrasse 45, D-15526 Bad Saarow, Germany J.Ruecker@t-online.de

Massoud SAAD, Oceanography Department, Faculty of Sciences, Alexandria Univ., Moharem Bey, 21511 Alexandria, Egypt

Monika SALBRECHTER, Biologische Station Neusiedler See, A-7142 Illmitz, Austria a8703940@unet.univie.ac.at

Hakan SANDSTEN, Limnology, Ecology Building, S-223 62 Lund, Sweden Hakan.Sandsten @limnol.lu.se

Michael SCHAGERL, Institute of Plant Physiology, Althanstrasse 14, A-1090 Vienna, Austria michael.schagerl @univie.ac.at

Angela SCHEER, Angela Scheer FB Oekologie, Freiligrath Str.78, 18055 Rostock, Germany

Marten SCHEFFER, Department of Aquatic Ecology and Water Quality Management, Wageningen Ag­ricultural University, P.O. Box 8080, NL 6700 DD Wageningen, The Netherlands marten @cc.ruu.nl

Gerald SCHERNEWSKI, Inst. f. Meereskunde, Univ. Kiel, (Privat: Walnussring 2, 24239 Achterwehr), Germany GSchern@ aol.com

K.F. SCHMIEDER, Universitat Hohenheim Inst. fiir Landschafts- u. Pftanzenokologie -320- 70593 Stuttgart, Germany schmied@uni.hohenheim.de

Mechthild SCHMITT, BTU Cottbus, SeestraBe 45, 15526 Bad Saarow, Germany kapschmitt@t-online.de

Hendrik SCHUBERT, Univ. Rostock, FB Biologie, Freiligrathstr. 7/8, 18055 Rostock, Germany nfdOO 1 @frserv. biol3. uni -rostock.de

Hans SCHUTTEN, Univ. of East Anglia, School of Biological Sciences, Population Biology Sector, Norwich NR4 7TJ, UK j.schutten@uea.ac.uk

Stefan SEIBERLING, Botanisches Institut, Grimmer Str. 88, 17487 Greifswald, Germany seiberli @rz.uni-greifswald.de

Angelika SEIFRIED, Limnologisches Institut, Uni­versitaet Konstanz, Mainaustr. 212, D-78457 Kon­stanz, Germany angelika.seifried@ uni-konstanz.de

Uwe SELIG, University of Rostock, Department of Biology , Freiligrathstr. 7-8,18051 Rostock, Ger­many us@frserv.bio3.uni-rostock.de

Boris SHTEINMAN, P.O. Box 345, Kinneret Limno­logical Lab., Tiberias 14102, Israel stehtein @internet -zahav.net

Christian SKOV, Danish Institute for Fisheries Re­search, Department of Inland Fisheries, Vejlsll)evej 39, DK-8600 Silkeborg, Denmark ck@ dfu.min.dk

Vladimir SKVORTSOV, Institute of Limnology, Sev­astyanova st. 9, 196199 St. Petersburg, Russia vsk@lake.spb.su

Martin SOENDERGAARD, National Environmental Research Institute, Vejlsll)evej 25, P.O. Box 314, DK-8600 Silkeborg, Denmark ms@dmu.dk

Christian STEINBERG, Institut ftir Gewasserokolo­gie und Binnenfischerei, Miiggelseedamm 310, D-12587 Berlin, Germany stein@ igb-berlin.de

John STRAND, Inst. of Ecology, Limnology Dept., Lund University, Ecology Building S-223 62 Lund, Sweden John. Strand@ limnol.lu.se

Elzbieta SZELAG-WASIELEWSKA, Department of Water Protection, Adam Mickiewicz University, Drzymaly 24, 60-613 Poznan, Poland

Helgard TAUSCHER, Institut ftir Gewasserokolo­gie und Binnenfischerei, Miiggelseedamm 260, D-12587 Berlin, Germany taeuscher@igb-berlin.de

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Eva TIEDGE, Peter-Rosegger-Weg 18, 78464 Kon­stanz, Germany eva. tiedge@ uni-konstanz. de

Irina TRIFONOVA, Institute of Lake Research, Sev­astyanova Str. 9, 196105 St. Petersburg, Russia trif@ lake.spb.su

Czeskawa TROJANOWSKA, Department of Chem­istry, Univ. of Education, Arciszewskiego 22, 76-200 Slupsk, Poland

Marcel VAN DE BERG, RIZA, Postbus 17, 8200 AA Lelystad, The Netherlands m.vdberg@riza.rws.minvenw.nl

Diederik VAN DER MOLEN, RIZA, Postbus 17, 8200 AA Lelystad, The Netherlands m.vdberg@riza.rws.minvenw.nl

Gerben VAN GEEST, Wageningen Agricultural Uni­versity, dep. of Aquatic Ecology and Water Quality Management, Wageningen, The Netherlands gerben. vangeest@ aq uec. w kao. wau. nl

jan VENTJEER, janv@csi.com

Annekatrin WAGNER, Institut fiir Hydrobiologie, TU Dresden, 01062 Dresden, Germany awagner@rcs.urz.tu-dresden.de

Norbert WALZ, Institut ftir Gewasserokologie und Binnenfischerei, Miiggelseedamm 260, D-12587 Berlin, Germany walz@ igb-berlin.de

Stefan E.B. WEISNER, Limnology, Lund University, Ecology Building, S-223 62 Lund, Sweden Stefan.Weisner@limnol.lu.se

Guntram WEITHOFF, Section of Ecology, Dept. of Biology, University of Turku, FIN-20014 Turku, Finland guntram.weithoff@utu.fi

Martin WELKER, Institut fiir Gewasserokologie und Binnenfischerei, Miiggelseedamm 310, 12587 Berlin, Germany welker@igb-berlin.de

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Claudia WIEDNER, BTU Cottbus, Lehrstuhl fiir Gewasserschutz, PlatanenstraBe 1, 15526 Bad Saarow, Germany ls.gew.5 @t-online.de

Andrea WILLE, Inst. of Geography, University of Greifswald, Jahnstr. 16, 17489 Greifswald, Ger­many wille@ gryps.rz. uni-greifswald.de

Adrianne WOJTAL, Department of Applied Ecology University of Lock, ul. Banacha 12/16, 90-237 Lodz, Poland mzal@biol.uni.lodz.pl

Georg, WOLFRAM, Arge Okologie, Zentagasse 47, A-1050 Wien, Austria georg. wolfram @netway.at

Anita WOLFRAM-WAIS, Naturhistorisches Museum Wien, 1. Zoo.Abt. Fischsammlung, Burgring 7, 1014 Wien, Austria georg. wolfram @netway.at

Susanne WORISCHKA, Institut fiir Hydrobiologie, TU Dresden, Mommsenstr. 13, 01062 Dresden, Germany sw9@rcs.urz.tu-dresden.de

Zambrano, Luis, Instituto de Ecologia, UNAM, Ciudad Universitaria, Apdo. Post. 70-275, Mexico, D.F. 04510 Mexico zambrano @miranda.ecologia. unam.m

M. Fronie ZANT, Ministry of Transport Public Works and Water Management, Directorate Lake IJssel Area, P.O. Box 600, 8200 AP Lelystad, The Neth­erlands F.M.Zant@RDIJ.WS.minvenw.nl

Barbara ZIPPEL, UFZ Centre for Environmental Re­search, Department of Inland Water Research , Am Biederitzer Busch 12, Germany zip pel@ lake.gm. ufz.de

Ludwik ZMUDZINSKI, Al. Zwyciestwa 190 A/25, 81-540 Gdynia, Poland zmudz@ cbmpan.gdynia. pl

Elke ZWIRNMANN, Institut fiir Gewasserokologie und Binnenfischerei, Miiggelseedamm 260, D-12587 Berlin, Germany zwirnmann @igb-berlin.de