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CORMORANTS IN EUROPE

Proceedings of the 3rd International Conference
on Cormorants in Europe

Gdansk, Poland 13-17 April 1993

Ekologia Polska vol. XLV, no. 1
Polish Journal of Ecology

CONTENTS

Foreword	3
Editorial note	5

POPULATION DEVELOPMENTS (breeding and wintering)

N. Baccetti – Recent development of the cormorant Phalacrocorax carbo population in Italy	9
J. Baumanis, U. Bergmanis, V. Smislov – Breeding status of the cormorant Phalacrocorax carbo in Latvia	11
V. Bianki, N. Boiko, V. Kokhanov – The cormorant Phalacrocorax carbo in Kandalaksha Bay (White Sea, Russia)	15
P. Boldreghini, S. Volponi, R. Santolini, G. Cherubini, P. Utmar – Recent trend of cormorant Phalacrocorax carbo population wintering in the northern Adriatic (Italy)	17
T. Bregnballe, J. Gregersen – Development of the breeding population of the cormorant Phalacrocorax carbo in Denmark up to 1993	23
G. Cherubini, N. Baccetti, M. Bon – Cormorants Phalacrocorax carbo wintering in the Lagoon of Venice, Italy	31
L. T. Costa, J. P. Granadeiro – The cormorant Phalacrocorax carbo in Portugal	39
G. Debout – Coastal breeding cormorants Phalacrocorax carbo in France: demography from 1988, site features, subspecies problem	43
K. Devos, P. Ulenaers – Increase of wintering and migrating cormorants Phalacrocorax carbo in Flanders, Belgium	49
G. Dornbusch – The cormorant Phalacrocorax carbo in Saxe - Anhalt, Germany	51
M. R. van Eerden, M. Zijlstra – The cormorant Phalacrocorax carbo in The Netherlands, an update for the period 1989-1992	53
M. Gogu-Bogdan, M. Marinov – Breeding and wintering of the cormorant Phalacrocorax carbo in the Romanian part of the Danube Delta	57
B. Ivanov, T. Michev, D. Nankinov, V. Pomakov, L. Profirov – Breeding and wintering status of the cormorant Phalacrocorax carbo in Bulgaria	63
V. Jusys – The cormorant Phalacrocorax carbo in western Lithuania	69
J. S. Kirby, R. M. Sellers – Recent trends in the numbers and distribution of cormorants Phalacrocorax carbo in Britain	71
V. Lilleleht – Some facts about the cormorant Phalacrocorax carbo in Estonia	77
I Lindell – Recent population development of the cormorant Phalacrocorax carbo in Sweden	79
L. Marion – Increase of the number of cormorants Phalacrocorax carbo wintering in France and the change of conservation status of the species	83
T. Menke – Development of the breeding population of the cormorant Phalacrocorax carbo in West Germany in the last decade (1980 – 1992)	93
P. Musil, J. Janda – Population development of the cormorant Phalacrocorax carbo in Czech and Slovak Republics	97
A. M. Poluda, I. I. Chernichko, V. V. Serebryakov, V. D. Siokhin, A. I. Korzyukov, M. E. Zhmud, A. I. Koshelev, I. Shchegolev, I. D. Belashkov – The cormorant Phalacrocorax carbo in Ukraine	105
J. Przybysz, M. Mellin, I. Mirowska-Ibron, A. Przybysz, J. Gromadzka - Recent development of cormorant Phalacrocorax carbo sinensis population in Poland	111
N. Røv – Recent trends in cormorant Phalacrocorax carbo population in Norway	117
I. Samusenko, M. Nikiforov, A. Kozulin – Status of the cormorant Phalacrocorax carbo in Belarus: distribution and population trends	119
V. Stanevicius, S. Paltanavicius – The cormorant Phalacrocorax carbo in southern and eastern Lithuania	123

BREEDING AND POST-BREEDING BIOLOGY,
PHYSIOLOGY, CONTAMINATION EFFECTS AND OTHERS

T. Bregnballe, J. Gregersen – Age-related reproductive success in cormorant Phalacrocorax carbo	127
S. Dirksen, T. J. Boudewijn – Effects of organochlorine contaminants on cormorants Phalacrocorax carbo in The Netherlands: a review of field and laboratory ecotoxicological research on reduced reproductive success	137
G. Ekins – The origin of ringed cormorants Phalacrocorax carbo at Aberton reservoir (Essex, England)	139
J. Fabczak, J. Szarek, K. Markiewicz, S. Smoczyfiski, K. Skibniewska – Preliminary results of studies on pathology of the liver of cormorants Phalacrocorax carbo from north-eastern Poland	153
W. Gorski, Z. Pajkert – Interactions between cormorants Phalacrocorax carbo and herring gulls Larus argentatus in their common breeding sites	161
J. Gregersen – Monitoring of Danish cormorants Phalacrocorax carbo based on colour ringing	165
K. Koffijberg, M. R. van Eerden – Discriminating sexes in the cormorant Phalacrocorax carbo sinensis	167
A. I. Korzyukov – Seasonal distribution of the cormorant Phalacrocorax carbo in the north-western part of the Black Sea region	169
M. Kozakiewicz, W. Meissner, M. Skakuj – Occurrence of the cormorant Phalacrocorax carbo sinensis at the Gulf of Gdansk (Poland) in the non breeding season	171
P. Musil, J. Janda – Habitat selection by the cormorant Phalacrocorax carbo on south Bohemian fishponds	173
Z. Pajkert, W. Gorski – Breeding ecology of cormorants Phalacrocorax carbo sinensis in Slowinski National Park (Northern Poland)	181
N. Røv – Variation in colony size of cormorants Phalacrocorax carbo in central Norway	185
L. Shkliarov – Some data on blood parameters of the cormorant Phalacrocorax carbo	187

FEEDING ECOLOGY

P. Boldreghini, R. Santolini, M. Pandolfi – Abundance and frequency of occurrence of prey-fish in the diet of cormorants Phalacrocorax carbo in the Po river delta (northern Italy) during the wintering period	191
P. Boldreghini, R. Santolini, S. Volponi, L. Casini, F. L. Montanari, R. Tinarelli – Variations in the use of foraging areas by a cormorant Phalacrocorax carbo wintering population: a case study in the Po Delta (northern Italy)	197
T. J. Boudewijn, S. Dirksen – Improved breeding success of cormorants Phalacrocorax carbo in a severely contaminated area in The Netherlands by a shift in food composition – a progress report	201
D. N. Carss, M. Marquiss – The diet of cormorants Phalacrocorax carbo in Scottish freshwaters in relation to feeding habitats and fisheries	207
M. R. van Eerden, M. Zijlstra – An overview of the species composition in the diet of Dutch cormorants with reference to the possible impact on fisheries	223
D. Grémillet – Stomach temperature probes in cormorants Phalacrocorax carbo: a measurement of the daily food intake in free-living individuals	233
T. Keller – Food of cormorants Phalacrocorax carbo wintering in Bavaria (southern Germany)	237
O. Martucci – Winter food habits of cormorants Phalacracorar carbo in central Italy: some remarks	239
A. Martyniak, M. Mellin, P. Stachowiak, A. Wittke – Food composition of cormorants Phalacrocorax carbo in two colonies in north-eastern Poland	245
M. Mellin, I. Mirowska-Ibron, A. Martyniak – Food composition of cormorants Phalacrocorax carbo shot at two fish farms in north-eastern Poland	247
R. Noordhuis, E. C. L. Marteijn, R. Noordhuis, S. Dirksen, T. J. Boudewijn – The trophic role of cormorants Phalacrocorax carbo in freshwater ecosystems in the Netherlands during the non-breeding period	249
W. Suter – Increase patterns, habitat choice and feeding tactics of cormorants Phalacrocorax carbo wintering in inland central Europe: an integrated view	263
W. Suter – Diet selection by cormorants Phalacrocorax carbo in inland central Europe in the non-breeding season	265
R. Veldkamp – Prey size selection by cormorants Phalacrocorax carbo at Wanneperveen (The Nether]ands) with special reference to bream Abramis brama	267

CORMORANTS AND FISHERY, MANAGEMENT PLANES

S. Asbirk – Management plan for cormorants Phalacrocorax carbo in Denmark	271
J. M. Davies, M. J. Feltham – Investigation into the impacts of cormorants Phalacrocorax carbo carbo on angling catches on a river system	273
K. A. Dobrowolski, R. Dejtrowski – Conflict between fishermen and cormorants Phalacrocorax carbo in Poland	279
J. Gromadzka, M. Gromadzki – Damage made by cormorants Phalacrocorax carbo in Europe: preliminary summary of questionnaire answers	285
J. J. Kieckbusch, B. Koop – Cormorant Phalacrocorax carbo and fishery in Schleswig-Ho]stein, Germany	287
J. S. Kirby, J. Holmes, R. M. Sellers – Conservation and management of cormorants Phalacrocorax carbo in Great Britain: the current situation	295
A. I. Koshelev – Methods and efficiency of scaring and regulation of cormorant Phalacrocorax carbo numbers in southern Ukraine	303
M. Mellin, I. Mirowska-Ibron – Results of cormorant Phalacrocorax carbo control in north-eastern Poland in 1987 – 1992	305
E. Staub – Cormorant Phalacrocorax carbo predation and conflicts with species conservation and fisheries in Switzerland	309
W. Suter – Cormorant Phalacrocorax carbo predation on salmonid fish in two Swiss rivers: the use and abuse of fisheries data in impact assessment	311
ANNEX: Position statement concerning cormorant research, conservation and management, Gdansk 1993	313
Cormorant Research Group established	318
Podsumowanie wiadomosci na tematstanu badan, ochrony i gospodarki populacjami kormorana, Gdansk 1993	320
List of participants of the Gdansk 1993 cormorant conference	327

Cormorants

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