The Editor is very grateful to the following reviewers who were kind enough to comment on the manuscripts submitted to OCEANOLOGIA in 1999:
Dr. Eugeniusz Andrulewicz (Sea Fisheries Institute, Gdynia, Poland) * Dr. Ryszard Bojanowski (Institute of Oceanology PAS, Sopot, Poland) * Prof. Dr. Erik Bonsdorff (Abo Akademi University, Finland) * Prof. Dr. Juliusz Chojnacki (Agricultural Academy, Szczecin, Poland) * Prof. Dr. Witold Cieslikiewicz (University of Gdansk, Poland) * Dr. Herve Claustre (Pierre and Marie Curie University, Villefranche-sur-Mer, France) * Prof. Dr. Jerzy Cyberski (University of Gdansk, Poland) * Prof. Dr. Wojciech Donderski (Nicolaus Copernicus University, Torun, Poland) * Prof. Dr. Czeslaw Druet (Institute of Oceanology PAS, Sopot, Poland) * Prof. Dr. Izabella Dunin-Kwinta (Maritime Academy, Szczecin, Poland) * Prof. Dr. Danuta Frackowiak (University of Technology, Poznan, Poland) * Prof. Dr. Czeslaw Garbalewski (Institute of Oceanology PAS, Sopot, Poland) * Prof. Dr. Jozef Grabowski (University of Technology, Poznan, Poland) * Prof. Dr. John S. Gray (University of Oslo, Norway) * Prof. Dr. Howard R. Gordon (University of Miami, USA) * Prof. Dr. Sergei Gulev (P. P. Shirshov Institute of Oceanology RAS, Moscow, Russia) * Prof. Dr. Lars Hagerman (University of Copenhagen, Helsingor, Denmark) * Prof. Dr. Niels Højerslev (University of Copenhagen, Denmark) * Prof. Dr. Krzysztof Jazdzewski (University of Lodz, Poland) * Prof. Dr. Tadeusz Jednoral (Marine Institute, Gdansk, Poland) * Dr. Miroslaw Jonasz (M. Jonasz Consultants, Optical Sensing Technology, Beaconsfield, Canada) * Dr. Sirje Keevallik (Estonian Meteorological Institute, Tallinn, Estonia) * Prof. Dr. Zygmunt Klusek (Institute of Oceanology PAS, Sopot, Poland) * Prof. Dr. Zbigniew Kosma (Technical University, Radom, Poland) * Doc. Dr. Grazyna Kowalewska (Institute of Oceanology PAS, Sopot, Poland) * Prof. Dr. Zygmunt Kowalik (University of Alaska, Fairbanks, USA) * Prof. Dr. Eugeniusz Kozaczka (The Polish Naval Academy, Gdynia, Poland) * Doc. Dr. Adam Krezel (University of Gdansk, Poland) * Dr. Tadeusz Krol (Institute of Oceanology PAS, Sopot, Poland) * Prof. Dr. Gotfryd Kupryszewski (Institute of Oceanology PAS, Sopot, Poland) * Prof. Dr. Henryk Lasota (Technical University of Gdansk, Poland) * Prof. Dr. Ryszard Ligowski (University of Lodz, Poland) * Prof. Dr. Ole J. Lønne (The University Courses on Svalbard, Longyearbyen, Norway) * Prof. Dr. Stanislaw Massel (Institute of Oceanology PAS, Sopot, Poland) * Prof. Dr. Jozef Mojski (The Polish Geological Institute, Branch of Marine Geology, Gdansk, Poland) * Prof. Dr. André Morel (Pierre and Marie Curie University, Villefranche-sur-Mer, France) * Doc. Dr. Jozef Nieradko (University of Gdansk, Gdynia, Poland) * Doc. Dr. Jerzy Olszewski (Institute of Oceanology PAS, Sopot, Poland) * Prof. Dr. Krzysztof Opalinski (Institute of Ecology PAS, Warsaw, Poland) * Dr. Ksenia Pazdro (Institute of Oceanology PAS, Sopot, Poland) * Prof. Dr. Janusz Pempkowiak (Institute of Oceanology PAS, Sopot, Poland) * Prof. Dr. Lars-Eric Persson (Kalmar University, Sweden) * Dr. Jacek Piskozub (Institute of Oceanology PAS, Sopot, Poland) * Prof. Dr. Marcin Plinski (University of Gdansk, Poland) * Dr. Teresa Radziejewska (Agricultural Academy, Szczecin, Poland) * Prof. Dr. Henryk Renk (Sea Fisheries Institute, Gdynia, Poland) * Prof. Dr. Krzysztof Rolka (University of Gdansk, Poland) * Prof. Dr. Alain Saliot (Pierre and Marie Curie University, Paris, France) * Prof. Dr. Jadwiga Sieminska (Institute of Botany PAS, Cracow, Poland) * Prof. Dr. Bogdan Skwarzec (University of Gdansk, Poland) * Prof. Dr. Andrzej Stolyhwo (Technical University of Gdansk, Poland) * Prof. Dr. Dariusz Stramski (University of California at San Diego, USA) * Prof. Dr. Hilding Sundqvist (Stockholm University, Sweden) * Prof. Dr. Antoni Sliwinski (University of Gdansk, Poland) * Doc. Dr. Anna Trzosinska (Institute of Meteorology and Water Management, Maritime Branch, Gdynia, Poland) * Doc. Dr. Zbigniew Witek (Sea Fisheries Institute, Gdynia, Poland) * Prof. Dr. Bogdan Wozniak (Institute of Oceanology PAS, Sopot, Poland) * Prof. Dr. Henryk Wrembel (Pedagogical University, Slupsk, Poland) * Prof. Dr. Andrzej Zielinski (Institute of Oceanology PAS, Sopot, Poland) * Dr. Bronislaw Zoltogorski (University of Technology, Wroclaw, Poland).
Acoustically measured diurnal vertical migration of fish
and zooplankton in the Baltic Sea -- seasonal variations
Oceanologia 2000, no 42 (1), pp. 5-17
Joanna Szczucka
Institute of Oceanology, Polish Academy of Sciences, Powstancow Warszawy 55, 81-712 Sopot, Poland;
szczucka.iopan.gda.pl
Keywords: sound scattering layers, diurnal vertical migration, Baltic Sea
Manuscript received 25 October 1999, reviewed 21 December 1999, accepted 12 January 2000.
Acoustic measurements were conducted at different seasons in the last five years at a fixed point of the Baltic Sea at a frequency 30 kHz concurrently with temperature and salinity sampling. Echosounding records were used to determine the seasonal and diurnal migration patterns of scattering layers in accordance with thermohaline conditions. Different seasonal patterns of nocturnal aggregations of organisms dependent on the temperature gradient in the thermocline were found. This paper illustrates the diurnal distributions of sound scattering layers and analyses the way they are linked to the physical structure of the water.
The biochemical composition of Enteromorpha spp.
from the Gulf of Gdansk coast on the southern Baltic Sea
Oceanologia 2000, no 42 (1), pp. 19-28
Amany Mohamed Haroon Anna Szaniawska, Monika Normant, Urszula Janas: Keywords: Enteromorpha spp., macroalgae, biochemical composition
Manuscript received 16 August 1999, reviewed 21 January 2000, accepted 31 January 2000.
Variations in lipid, protein and carbohydrate contents of Enteromorpha spp. were examined over a seven-month period from
April to October 1993. The samples were collected from seven sampling stations along the Gulf of Gda/nsk coast.
The lipid content was low and varied slightly from 3.47 ± 1.76% of DW at Puck to 4.36 ± 2.17% of DW at Rewa
and Cha/lupy. The protein content varied from 9.42 ± 4.62% of DW at Puck to 20.60 ± 5.00% of DW at Jurata.
At the remaining stations the values vary over a narrow range. The maximum protein contents were
recorded at the beginning and end of the growing season. The level of carbohydrate was very high compared to that of
lipid and protein and varied from 29.09 ± 6.44% of DW at Oslonino to 39.81 ± 11.15% of DW at Puck.
Seasonal carbohydrate changes were noted at all sampling stations, the minimum occurring in spring and autumn and the maximum in summer.
The first recorded bloom of Prorocentrum minimum (Pavillard) Schiller
in the coastal zone of the Gulf of Gdansk Barbara Witek, Marcin Plinski Keywords: Prorocentrum minimum, bloom
Manuscript received 22 July 1999, reviewed 25 August 1999, accepted 7 October 1999.
Prorocentrum minimum (Pavillard) Schiller has occurred in the Gulf of Gdansk in low abundance for several years.
However, in summer 1997 a significant increase in the numbers of cells was noted.
In the same year a P. minimum bloom was recorded for the first time in one of the harbour basins in Gdynia,
giving rise to a brown-red coloration of the water.
Greenland whales and walruses in the Svalbard
food web before and after exploitation Jan Marcin Weslawski Louwrens Hacquebord Lech Stempniewicz, Michal Malinga Keywords: Food web, Arctic, sea mammals, human impact
Manuscript received 29 November 1999, reviewed 25 January 2000, accepted 7 February 2000.
Between 1600 and 1900 two numerous and ecologically important large marine mammals were extirpated in the
Svalbard archipelago. These were the pelagic-feeding Greenland whale (Balaena mysticetus) and the benthic-feeding walrus
(Odobaenus rosmarus rosmarus), the initial stocks of which prior to exploitation are estimated to have numbered
approximately 46 000 and 25 000 animals respectively. Their annual food consumption at that time is estimated to
have been some 4 million tons of plankton and 0.4 million tons of benthic organisms.
Assuming that the primary and secondary production of the shelf/coastal ecosystem in the 16th century
(before the peak of the Little Ice Age) was similar to that of the present day, the authors have concluded that a major shift
in the food web must have occurred after the Greenland whales and walruses were eliminated.
Planktonivorous seabirds and polar cod (Boreogadus saida) very probably took advantage of the extirpation of the Greenland
whales, while eiders (Somateria mollissima) and bearded seals (Erignathus barbatus) benefited from the walrus's extinction.
In turn, the increased amount of pelagic fish provided food for piscivorous alcids and gulls, and may have given rise to the huge
present-day seabird colonies on Svalbard.
Entrapment of macroplankton in an Arctic fjord basin,
Kongsfjorden, Svalbard Jan Marcin Weslawski Gunnar Pedersen Stig Falk Petersen Krzysztof Porazinski Keywords: Arctic, macroplankton, krill, fjords
Manuscript received 29 November 1999, reviewed 5 January 2000, accepted 13 January 2000.
This paper presents the results of 15 zooplankton tows collected with a Tucker Trawl
(1 m2 opening, net of 2 mm mesh size) in Kongsfjorden (79oN), Svalbard archipelago. The hydroacoustic survey
revealed clear differences between the plankton concentrations in the outer and inner fjord basins. Plankton concentrations and fish
were observed in the outer fjord, while uniformly scattered objects were detected in the inner basin.
The macroplankton community was dominated by Euphausiacea (Thysanoessa inermis, Thysanoessa rashii), Amphipoda
(Themisto libellula) and Pteropoda (Limacina helicina). Other taxa were of minor numerical importance.
The macroplankton abundance reached 3300 indiv. 100-1 m-3 with a maximum biomass
of 100 g wet weight 100-1 m-3 (over 440 kJ 100-1 m-3).
L. helicina was advected into the fjord with surface waters, and was found in large abundance
(1000 indiv. 100-1 m-3) in the subsurface layers of the inner basin. Euphausids were present in small numbers at
the entrance to the fjord, but were found to be very abundant (600 indiv. 100-1 m-3)
at the innermost stations, especially in the surface water layer. The estuarine circulation driven by the glacial meltwater discharge is
believed to cause the entrapment of zooplankton in the inner fjord basin.
Changes in species composition of the genus Gammarus Fabr. in Puck Bay Wojciech Jeczmien, Anna Szaniawska Keywords: Amphipoda, species composition, Gammaridae, Puck Bay
Manuscript received 21 January 2000, reviewed 11 February 2000, accepted 15 February 2000.
This paper describes the current species composition of the genus Gammarus in Puck Bay (western Gulf of Gdansk, Poland).
Samples were taken at 9 shallow (ca 0.4 m deep) and 4 deeper (ca 10 m) stations from April 1997 to March 1998.
Six Gammarus species were recorded. Gammarus salinus was the most numerous, making up 34.95%
of the total of identified amphipod specimens. This species was common throughout the bay but rarely
predominant. G. zaddachi (34.75%) was dominant in the northern part of the bay from January
to April and was found in almost 2/3 of samples. Less numerous were G. oceanicus (19.15%),
common in the southern and eastern parts of Puck Bay, and G. duebeni (9.85%), prevalent in
shallow and rocky locations. G. inequicauda and G. locusta made up only 1.13% and 0.12%
of the total amphipod material respectively. The species composition of the genus varied
considerably not only from one sampling locality to another but also from season to season. It
is possible that two species (G. locusta and G. inequicauda) are currently withdrawing from Puck Bay.
Seasonal and diel changes in the vertical distribution in relation
to the age structure of Microcalanus pygmaeus Sars and Ctenocalanus citer Bowman & Heron,
(Pseudocalanidae, Copepoda) from Croker Passage (Antarctic Peninsula) Maria Iwona Zmijewska, Luiza Bielecka, Aleksandra Grabowska Keywords: Antarctica, Copepoda, age structure
Manuscript received 10 January 2000, reviewed 21 February 2000, accepted 24 February 2000.
The development of two representatives of Pseudocalanidae and the nature of their population
distribution in the water column were investigated on the basis of plankton samples collected
over three seasons in night-day series in Croker Passage. The investigations showed that the
two species begin reproducing in different seasons. Regardless of season, the growth of M. pygmaeus
is more advanced than that of C. citer. Both species are characterised by a
separation of their populations in the water column. The youngest copepodite stages (I-III)
inhabit the upper portion of the water in which the given species occurs, while the oldest
specimens, especially males, inhabit the deepest waters. Additionally, the first growth phases
(CI-CIII) show a tendency to concentrate closer to the surface at night.
The occurrence and activity of sulphate-reducing bacteria in the
bottom~sediments of the Gulf of Gdansk Zbigniew Jan Mudryk Beata Podgorska, Anetta Ameryk Jerzy Bolalek Keywords: Gulf of Gdansk, sediment, sulphate-reducing bacteria,
sulphate reduction rate
Manuscript received 21 January 2000, reviewed 17 February 2000, accepted 23 February 2000.
The paper presents the results of investigations concerning the number, distribution and physiological activity of
sulphate-reducing bacteria (SRB) inhabiting the bottom sediments of the Gulf of Gdansk.
The numbers of this group of bacteria range between 0.76 x 103 and 1.27 x 104 cells per g wet sediment.
The bacterial sulphate reduction rate in bottom sediments of this area of the Baltic Sea varies from
1.89 to 31.6 nM SO42– g-1 24 h-1.
The numbers of SRB and their physiological activity were subject to considerable seasonal fluctuations,
maximum values being noted in summer (June) and minima in spring (April).
A direct relationship has been found between the number of SRB and hydrogen sulphide concentrations;
there is, however, no such relationship with reference to sulphate concentrations. The numbers and distributions of SRB
demonstrated considerable variation in a depth profile of bottom sediments. SRB inhabiting the bottom sediments of the Gulf of Gdansk were
able to use three different organic substrates (lactate, acetate, propionate) as electron donors and as carbon and energy sources.
Mya arenaria L., a new and unusual substratum for
Balanus improvisus Darwin
Anna Olszewska
Keywords: Balanus improvisus, Epizoite, and Mya arenaria, southern Baltic
Manuscript received 20 December 1999, reviewed 21 January 2000, accepted 28 January 2000.
The presence of the barnacle (Balanus improvisus) on the soft-shell clam (Mya arenaria) is reported for the first
time from the Baltic Sea.
Jürgen Sündermann
Keywords: research programmes, Grand challenges, North Sea
Manuscript received 22 December 1999.
The present state of North Sea research was assessed and examined at an International Symposium in Hamburg.
Specific attention was devoted to the issues of external forcing, internal dynamics, and new methods and experiments.
In the concluding discussion Grand Challenges for North Sea research were formulated.
National Institute of Oceanography and Fisheries, Academy of Scientific Research and Technology, 101 Kaser El-eni St., Cairo, Egypt;
Institute of Oceanography, University of Gdansk, al. Marszalka Pilsudskiego 46, 81-378 Gdynia, Poland;
oceasz@univ.gda.pl
Abstract
full, complete article (PDF - compatibile with Acrobat 3.0)
Oceanologia 2000, no 42 (1), pp. 29-36
Institute of Oceanography, University of Gdansk, al. Marszalka Pilsudskiego 46, 81-378 Gdynia, Poland;
ocebw@univ.gda.pl
Abstract
full, complete article (PDF - compatibile with Acrobat 3.0)
Oceanologia 2000, no 42 (1), pp. 37-56
Institute of Oceanology, Polish Academy of Sciences, Powstancow Warszawy 55, 81-712 Sopot, Poland;
weslaw@iopan.gda.pl
Arctic Centre, University of Groningen, Oude Kijk in't Jatstraat 26, The Netherlands;
Department of Vertebrate Ecology, University of Gdansk, Legionow 9, 80-441 Gdansk, Poland;
Abstract
full, complete article (PDF - compatibile with Acrobat 3.0)
Oceanologia 2000, no 42 (1), pp. 57-69
Institute of Oceanology, Polish Academy of Sciences, Powstancow Warszawy 55, 81-712 Sopot, Poland;
weslaw@iopan.gda.pl
Akvaplan-niva, Polar Environmental Centre, Tromso 9296, Norway;
Norsk Polarinstitutt, Polar Environmental Centre, Tromso 9296, Norway;
Institute of Oceanology, Polish Academy of Sciences, Powstancow Warszawy 55, 81-712 Sopot, Poland;
Abstract
full, complete article (PDF - compatibile with Acrobat 3.0)
Oceanologia 2000, no 42 (1), pp. 71-87
Institute of Oceanography, University of Gdansk, al. Marszalka Pilsudskiego 46, 81-378 Gdynia, Poland;
Wojciech.Jeczmien@ocean.univ.gda.pl
Abstract
full, complete article (PDF - compatibile with Acrobat 3.0)
Oceanologia 2000, no 42 (1), pp. 89-103
Institute of Oceanography, University of Gdansk, al. Marszalka Pilsudskiego 46, 81-378 Gdynia, Poland;
ocemiz@univ.gda.pl
Abstract
full, complete article (PDF - compatibile with Acrobat 3.0)
Oceanologia 2000, no 42 (1), pp. 105-117
Department of Experimental Biology, Pedagogical University, Arciszewskiego 22, 76-200 Slupsk, Poland;
mudryk@wsp.slupsk.pl
Marine Biology Centre, Polish Academy of Sciences, Sw. Wojciecha 5, 81-347 Gdynia, Poland;
Institute of Oceanography, University of Gdansk, al. Marszalka Pilsudskiego 46, 81-378 Gdynia, Poland;
Abstract
full, complete article (PDF - compatibile with Acrobat 3.0)
Communications
Oceanologia 2000, no 42 (1), pp. 119-121
Department of Marine Biology and Ecology, Institute of Oceanography, University of Gdansk,
al. Marszalka Pilsudskiego 46, 81-378 Gdynia, Poland;
aniao@ocean.univ.gda.pl
Abstract
full, complete article (PDF - compatibile with Acrobat 3.0)
Chronicle
New Challenges for North Sea Research -- 20 years after FLEX '76
(Summary, results and conclusions of the International Symposium)
Oceanologia 2000, no 42 (1), pp. 123-131
Centre of Marine and Climate Research, University of Hamburg, Bundesstr. 55, 20146 Hamburg, Germany;
suendermann@ifm.uni-hamburg.de
Abstract
full, complete article (PDF - compatibile with Acrobat 3.0)