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  1. Authors: W. Hickel, R. Schmaljohann, Werner Armonies, G. Hartmann, K. Anger, K. Janke, R. Schipp, D. Siebers, K. R. Sperling, G. Gassmann and W. E. Krumbein
    Citation: Helgoländer Meeresuntersuchungen 1990 44:BF02365484
    Content type: BookReview Published on:

  2. Qualitative and quantitative analyses of phytoplankton from the inner part of Thermaikos Gulf were carried out in the period May 1988–April 1989. A total of 154 taxa were identified in the phytoplankton. the m...

    Authors: Georgios Nikolaides and Maria Moustaka-Gouni
    Citation: Helgoländer Meeresuntersuchungen 1990 44:BF02365482
    Content type: OriginalPaper Published on:

  3. Two species of cold-temperate algae from the North Atlantic Ocean,Polyides rotundus andFurcellaria lumbricalis, were tested for growth and survival over a temperature range of −5 to 30 °C. In comparisons of easte...

    Authors: I. Novaczek and A. M. Breeman
    Citation: Helgoländer Meeresuntersuchungen 1990 44:BF02365481
    Content type: OriginalPaper Published on:

  4. Three species of Arctic to cold-temperate amphi-Atlantic algae, all occurring also in the North Pacific, were tested for growth and/or survival at temperatures of −20 to 30°C. When isolates from both western a...

    Authors: I. Novaczek, G. W. Lubbers and A. M. Breeman
    Citation: Helgoländer Meeresuntersuchungen 1990 44:BF02365480
    Content type: OriginalPaper Published on:

  5. The morphology and histology of the planula larva ofEudendrium racemosum (Cavolini) and its metamorphosis into the primary polyp are described from light microscopic observations. The planula hatches as a differe...

    Authors: C. Sommer
    Citation: Helgoländer Meeresuntersuchungen 1990 44:BF02365478
    Content type: OriginalPaper Published on:

  8. Fragilidium fissile is a new species of this rare genus. It somewhat resemblesF. subglobosum. It differs from the latter in having a slot and a pore in the first apical plate 1′ (the nomenclature of dinoflagella...

    Authors: Enrique Balech
    Citation: Helgoländer Meeresuntersuchungen 1990 44:BF02365475
    Content type: OriginalPaper Published on:

  10. The complete larval development of the porcellanid crabNeopisosoma negluctum Werding, 1986, was studied under laboratory conditions. At 27°C, the megalopa appeared after 9 days. The development consists of a tran...

    Authors: B. Werding and H. -G. Müller
    Citation: Helgoländer Meeresuntersuchungen 1990 44:BF02365473
    Content type: OriginalPaper Published on:

  11. 376 leptocephali ofAnguilla anguilla (L., 1758) from the Iberian Basin were analysed. The observed horizontal trends of abundance and particularly the mean sizes contradict the expectations based on the hypothesi...

    Authors: H. -D. Bast and B. Strehlow
    Citation: Helgoländer Meeresuntersuchungen 1990 44:BF02365472
    Content type: OriginalPaper Published on:

  13. During spring 1986 and winter 1987, zooplankton samples were collected over the entire North Sea by means of a multi-closing net-system. Before taxonomic treatment, wet weight estimates and carbon content conv...

    Authors: M. Krause and P. Martens
    Citation: Helgoländer Meeresuntersuchungen 1990 44:BF02365469
    Content type: OriginalPaper Published on:

  14. Pirsonia guinardiae gen. et spec. nov. was discovered as a parasite onGuinardia flaccida in the North Sea near List/Sylt during a bloom of this centric planktonic diatom. It is a colourless, small flagellate wit...

    Authors: E. Schnepf, G. Drebes and M. Elbrächter
    Citation: Helgoländer Meeresuntersuchungen 1990 44:BF02365468
    Content type: OriginalPaper Published on:

  15. The authors investigated the development of the harpacticoid copepod population in relation to the variations in organic matter and meteorology. Sediment sampling was performed over a 2-year period in the shal...

    Authors: J. Y. Bodiou, D. Delille and L. Tito de Morais
    Citation: Helgoländer Meeresuntersuchungen 1990 44:BF02365467
    Content type: OriginalPaper Published on:

  16. Over 3 successive seasonal cycles (April 1986 to October 1988), field experiments were established within 3 intertidal levels in the sheltered rocky intertidal of Helgoland (North Sea, German Bight). Competito...

    Authors: Klaus Janke
    Citation: Helgoländer Meeresuntersuchungen 1990 44:BF02365466
    Content type: OriginalPaper Published on:

  17. Macrobenthic fauna and sediment parameters were studied at 40 stations representing a 494 km2 survey area in the eastern part of the German Bight and encompassing the sewage sludge dumping site. Data were taken i...

    Authors: Ute Mühlenhardt-Siegel
    Citation: Helgoländer Meeresuntersuchungen 1990 44:BF02365465
    Content type: OriginalPaper Published on:

  18. Some aspects of the biology and ecology of the gobyKnipowitschia caucasica were studied over a period of 13 months in a poly-to euhaline area in the Evros Delta (North Aegean Sea). This fish grows rapidly in the ...

    Authors: T. Kevrekidis, A. K. Kokkinakis and A. Koukouras
    Citation: Helgoländer Meeresuntersuchungen 1990 44:BF02365464
    Content type: OriginalPaper Published on:

  19. The details of spermatogenesis and spermiogenesis are described forOphryotrocha puerilis. The ultrastructure of mature sperm is shown forO. puerilis, O. hartmanni, O. gracilis, O. diadema, O. labronica, andO. not...

    Authors: Hans-Dieter Pfannenstiel and Charlotte Grünig
    Citation: Helgoländer Meeresuntersuchungen 1990 44:BF02365463
    Content type: OriginalPaper Published on:

  21. The mode of anaerobic energy production of juvenileArenicola marina (0-generation) was investigated under experimental conditions and in the biotope. Under experimental anaerobic conditions, juvenileA. marina pro...

    Authors: Doris Schiedek and Udo Schöttler
    Citation: Helgoländer Meeresuntersuchungen 1990 44:BF02365461
    Content type: OriginalPaper Published on:

  22. The adaptation of littorinid molluscs to prolonged aerial exposure was investigated by the determination of heat production.Littorina saxatilis, inhabiting the upper eulittoral, reached a maximum metabolic activi...

    Authors: Inge Kronberg
    Citation: Helgoländer Meeresuntersuchungen 1990 44:BF02365460
    Content type: OriginalPaper Published on:

  23. Spermatozoa and spermiogenesis in the deep-water cephalopodSpirula sprirula (L.) are examined using transmission electron microscopy. Mature spermatozoa (taken from spermatophores) are elongate cells 115–120 μm l...

    Authors: John M. Healy
    Citation: Helgoländer Meeresuntersuchungen 1990 44:BF02365434
    Content type: OriginalPaper Published on:

  25. Thinning of the digestive epithelium of marine molluscs may provide an index of environmental stress. Variability in epithelial thickness, as a consequence of the large variety of environmental and populationa...

    Authors: J. A. Marigómez, V. Sáez, M. P. Cajaraville and E. Angulo
    Citation: Helgoländer Meeresuntersuchungen 1990 44:BF02365432
    Content type: OriginalPaper Published on:

  27. This paper describes the macroflora and macrofauna associated with two bull kelp species,Laminaria hyperborea andL. digitata, at the island of Helgoland, North Sea. During a study period of seven months (March–Se...

    Authors: Kirstin Schultze, Klaus Janke, Andreas Krüß and Wolfgang Weidemann
    Citation: Helgoländer Meeresuntersuchungen 1990 44:BF02365430
    Content type: OriginalPaper Published on:

  30. During an intensive survey in May/June 1986, 129 stations in the North Sea were examined in different water depths with respect to several hydrographical parameters. The relations of planktonic faecal pellets ...

    Authors: Peter Martens and Michael Krause
    Citation: Helgoländer Meeresuntersuchungen 1990 44:BF02365427
    Content type: OriginalPaper Published on:

  32. Authors: H. Kapp, H. v. Westernhagen, Guenter Gassmann, E. Hagmeier, A. Mackensen, F. -W. Tesch, I. Bartsch, O. Giere and G. Lauckner
    Citation: Helgoländer Meeresuntersuchungen 1989 43:BF02365914
    Content type: BookReview Published on:

  34. The aims, content, and organisatory structure of a proposed interdisciplinary ecosystem research project in the Wadden Sea of Schleswig-Holstein (W. Germany) are briefly presented. The project will include res...

    Authors: Christoph Leuschner and Bernd Scherer
    Citation: Helgoländer Meeresuntersuchungen 1989 43:BF02365912
    Content type: OriginalPaper Published on:

  35. The pattern of distribution of intertidal mussel beds is relatively constant over a number of years although their surface area can vary greatly. The abundance of mussels shows much greater fluctuations. In th...

    Authors: N. Dankers and K. Koelemaij
    Citation: Helgoländer Meeresuntersuchungen 1989 43:BF02365909
    Content type: OriginalPaper Published on:

  36. Since 1950, two large-scale changes have taken place in the western Dutch Wadden Sea, namely the eutrophication of the area and the introduction of an extensive mussel culture. Although eutrophication in the f...

    Authors: Henk W. van der Veer
    Citation: Helgoländer Meeresuntersuchungen 1989 43:BF02365908
    Content type: OriginalPaper Published on:

  37. The increasing P and N content in the two main tidal basins in the western Dutch Wadden Sea, the Marsdiep and the Vliestroom basin, has been reconstructed from the 50s onwards. The area is enriched with nutrie...

    Authors: Henk W. van der Veer, Wim van Raaphorst and Magda J. N. Bergman
    Citation: Helgoländer Meeresuntersuchungen 1989 43:BF02365907
    Content type: OriginalPaper Published on:

  38. Monitoring of fish and crustaceans in the Wadden Sea (WS) must cope with rapid changes in distribution patterns, access to certain areas and gear efficiency. Application and limitations of a variety of fishing...

    Authors: Maarten Ruth and Rüdiger Berghahn
    Citation: Helgoländer Meeresuntersuchungen 1989 43:BF02365905
    Content type: OriginalPaper Published on:

  39. The seasonal and local distribution of fish in the Wadden Sea depends on the various modes of life of each species. To obtain nearly all species of the fish fauna and the stages of development in different spa...

    Authors: Volkmar Hinz
    Citation: Helgoländer Meeresuntersuchungen 1989 43:BF02365903
    Content type: OriginalPaper Published on:

  40. For 20 years (1969–1988), larger bottom animals have been sampled quantitatively once or twice annually at 15 stations scattered over Balgzand (a 50 km2 tidal flat area in the westernmost part of the Dutch Wadden...

    Authors: J. J. Beukema
    Citation: Helgoländer Meeresuntersuchungen 1989 43:BF02365900
    Content type: OriginalPaper Published on:

  42. For no other group of organisms in coastal areas are there so exact and long-term data available as there are for seabirds. Since the beginning of the 20th century, documentation of population size, especially...

    Authors: Gottfried Vauk, Johannes Prüter and Eike Hartwig
    Citation: Helgoländer Meeresuntersuchungen 1989 43:BF02365896
    Content type: OriginalPaper Published on:

  44. This paper deals with the methods and results of monitoring sea level (tidal gauges) and with the analysis of depth sounding data. Possible future monitoring by menas of remote sensing techniques will be prese...

    Authors: Robbert Misdorp, Frank Steyaert, John de Ronde and Frank Hallie
    Citation: Helgoländer Meeresuntersuchungen 1989 43:BF02365894
    Content type: OriginalPaper Published on:

  45. For 10 selected tide gauges at the German North Sea Coast, the time series of the mean high water (MHW) and mean low water (MLW) were analysed. Since about 1950, both levels deviate from earlier trends; MHW sh...

    Authors: Alfred Führböter
    Citation: Helgoländer Meeresuntersuchungen 1989 43:BF02365893
    Content type: OriginalPaper Published on:

  46. The main activities of the Federal Republic of Germany regarding the monitoring of the pollution of the North Sea and the Baltic Sea are described. Reference is also made to research projects concerned with th...

    Authors: Dieter P. Kohnke
    Citation: Helgoländer Meeresuntersuchungen 1989 43:BF02365892
    Content type: OriginalPaper Published on:

  47. A national programme for monitoring wildlife and its habitats has been set up in Denmark, the background being decades of severe environmental problems and degradation. The aims is to obtain a minimal coverage...

    Authors: Peder Agger
    Citation: Helgoländer Meeresuntersuchungen 1989 43:BF02365891
    Content type: OriginalPaper Published on:

  48. Patchy distribution of animals, on a large or small scale, is a common phenomenon. Various explanations have been given for this spatial and temporal heterogeneity, but in many cases the causes are obscure. Pa...

    Authors: P. de Wolf
    Citation: Helgoländer Meeresuntersuchungen 1989 43:BF02365888
    Content type: OriginalPaper Published on:

  49. The Wadden Sea is an ecotone of far-reaching importance. Its nature is continuously changing, and ecological monitoring is needed to identify and analyse trends, and to inform the general public about accelera...

    Authors: Karsten Reise
    Citation: Helgoländer Meeresuntersuchungen 1989 43:BF02365887
    Content type: OriginalPaper Published on:

  50. Authors: K. Reise, W. Armonies and B. Scherer
    Citation: Helgoländer Meeresuntersuchungen 1989 43:BF02365886
    Content type: EditorialNotes Published on:
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Helgoland Marine Research

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