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  1. The vegetative life cycle, host specificity, morphology, and ultrastructure of a new phagotrophic nanoflagellate are described:Cryothecomonas aestivalis Drebes, Kühn & Schnepf sp. nov. During summer and autumn it...

    Authors: G. Drebes, S. F. Kühn, A. Gmelch and E. Schnepf
    Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367163
    Content type: OriginalPaper Published on:

  3. In the Wadden Sea,4 species of marine mammals are threatened (2 seals and 2 small cetacean species) and are therefore placed on the trilateral Red List. The status of 3 species of marine mammals is critical and t...

    Authors: S. Tougaard, C. Kinze, H. Benke, G. Heidemann, P. J. H. Reijnders and M. F. Leopold
    Citation: Helgoländer Meeresuntersuchungen 1996 50(Suppl 1):BF02366181
    Content type: OriginalPaper Published on:

    This article is part of a Supplement: Volume 50 Supplement 1

  4. 350000–400000 pairs of breeding birds as well as 10–12 millions of migratory waterbirds use the Danish-German-Dutch Wadden Sea as a feeding, roosting and moulting area.

    Authors: L. M. Rasmussen, O. G. Norden Andersen, J. Frikke, K. Laursen, J. Salvig, D. M. Fleet, B. Hälterlein, H. Heckenroth, T. Merck, H. -U. Rösner, P. Südbeck, W. J. Wolff and J. B. M. Thissen
    Citation: Helgoländer Meeresuntersuchungen 1996 50(Suppl 1):BF02366180
    Content type: OriginalPaper Published on:

    This article is part of a Supplement: Volume 50 Supplement 1

  5. In the Wadden Sea, in total, 8 species of amphibians and 4 species of reptiles are threatened in at least one subregion. Of these, 7 species of amphibians and all 4 species of reptiles are threatened in the en...

    Authors: K. Fog, R. Podloucky, U. Dierking and A. H. P. Stumpel
    Citation: Helgoländer Meeresuntersuchungen 1996 50(Suppl 1):BF02366179
    Content type: OriginalPaper Published on:

    This article is part of a Supplement: Volume 50 Supplement 1

  6. In the Wadden Sea areas of Denmark, Germany and The Netherlands, a total of 162 fish and lamprey species is known. 72 of these species are migrants entering the area occasionally; the total number of resident ...

    Authors: S. Berg, C. Krog, B. Muus, J. Nielsen, R. Fricke, R. Berghahn, Th. Neudecker and W. J. Wolff
    Citation: Helgoländer Meeresuntersuchungen 1996 50(Suppl 1):BF02366178
    Content type: OriginalPaper Published on:

    This article is part of a Supplement: Volume 50 Supplement 1

  7. In typical coastal habitats of the Wadden Sea, 15 species of grasshoppers are threatened in at least one subregion. Of these, 14 species are threatened in the entire area and are therefore placed on the trilat...

    Authors: K. Holst, G. Grein, U. Dierking and W. K. R. E. van Wingerden
    Citation: Helgoländer Meeresuntersuchungen 1996 50(Suppl 1):BF02366177
    Content type: OriginalPaper Published on:

    This article is part of a Supplement: Volume 50 Supplement 1

  8. As no data on beetles in the Wadden Sea area are available from The Netherlands, the trilateral status of threat only refers to the Danish and German part of the Wadden Sea. In this area, in total, 238 species...

    Authors: V. Mahler, R. Suikat and Th. Aßmann
    Citation: Helgoländer Meeresuntersuchungen 1996 50(Suppl 1):BF02366176
    Content type: OriginalPaper Published on:

    This article is part of a Supplement: Volume 50 Supplement 1

  9. In the Wadden Sea, in total, 55 species of spiders are threatened in at least one subregion. Of these, 50 species are threatened in the entire area and are therefore placed on the trilateral Red List. Accordin...

    Authors: C. Vangsgård, H. -D. Reinke, W. Schultz and P. J. van Helsdingen
    Citation: Helgoländer Meeresuntersuchungen 1996 50(Suppl 1):BF02366175
    Content type: OriginalPaper Published on:

    This article is part of a Supplement: Volume 50 Supplement 1

  10. In the Wadden Sea, in total, 93 species of macrofaunal benthic invertebrates are threatened in at least one subregion. Of these, 72 species are threatened in the entire area and are therefore placed on the tri...

    Authors: G. H. Petersen, P. B. Madsen, K. T. Jensen, K. H. van Bernem, J. Harms, W. Heiber, I. Kröncke, H. Michaelis, E. Rachor, K. Reise, R. Dekker, G. J. M. Visser and W. J. Wolff
    Citation: Helgoländer Meeresuntersuchungen 1996 50(Suppl 1):BF02366174
    Content type: OriginalPaper Published on:

    This article is part of a Supplement: Volume 50 Supplement 1

  11. In the Wadden Sea area, a total of 248 (sub)species of vascular plants are threatened in at least one subregion. Of these, 216 (sub)species are threatened in the entire area and are therefore placed on the tri...

    Authors: P. Wind, M. van der Ende, E. Garve, A. Schacherer and J. B. M. Thissen
    Citation: Helgoländer Meeresuntersuchungen 1996 50(Suppl 1):BF02366173
    Content type: OriginalPaper Published on:

    This article is part of a Supplement: Volume 50 Supplement 1

  16. 387 premetamorphic leptocephali of the familyAnguillidae caught off the west coast of Europe were examined taxonomically and compared with the youngest developmental stages of larvae ofAnguilla anguilla caught in...

    Authors: B. Strehlow
    Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367113
    Content type: OriginalPaper Published on:

  17. Stable carbon isotope ratios were measured for the muscle tissue of blue musselMytilus edulis, eelgrassZostera marina, macroalgaeFucus vesiculosus, and phytoplankton in two areas in Kiel Fjord, Germany. Carbon is...

    Authors: W. L. Wiedemeyer and R. Schwamborn
    Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367112
    Content type: OriginalPaper Published on:

  18. The newly described speciesLeucon intermedius n. sp. differs from other knownLeucon species by an inconspicuous antennal notch and the presence of only a few teeth at the dorsomedian crest. The species most simil...

    Authors: U. Mühlenhardt-Siegel
    Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367111
    Content type: OriginalPaper Published on:

  19. The generaDiscorhabdella andCrambe are characterized by bearing uncommon spicule types, i.e. pseudoastrose acanthostyles and sphaeroclones, respectively. They have traditionally been considered to be unrelated ta...

    Authors: M. Maldonado and M. J. Uriz
    Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367110
    Content type: OriginalPaper Published on:

  21. The reproductive period and life-history parameters were investigated for the hoplonemertineAmphiporus lactifloreus found on the tidal flats of the island of Sylt in the northern Wadden Sea. Every six weeks 20 in...

    Authors: Martin Thiel and Thorsten Dernedde
    Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367108
    Content type: OriginalPaper Published on:

  22. Digenetic trematodes are widespread among mud snails (Hydrobiidae) living in coastal lagoons and estuaries, but knowledge is generally lacking on their impact on these host organisms. We examined the survival ...

    Authors: K. T. Jensen, G. Latama and K. N. Mouritsen
    Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367107
    Content type: OriginalPaper Published on:

  23. Cytopathological effects on organelles of penis epithelium cells were investigated in prosobranchs that had been exposed for two weeks to three months to high TBT-concentrations in artificial seawater. TBT exp...

    Authors: M. Brick, U. Deutsch and P. Fioroni
    Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367106
    Content type: OriginalPaper Published on:

  25. The reproduction and larval development ofManayunkia aestuarina, a polychaete typical of brackish lenitic waters, was studied in a tideless shallow region on the south Baltic coast in 1990. Reaching abundances of...

    Authors: A. Bick
    Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367157
    Content type: OriginalPaper Published on:

  26. The horizontal mesoscale distribution ofMarenzelleria viridis (Verrill, 1873), a spionid polychaete introduced from North American coastal waters during the 1980s, was studied in shallow water in the southern Bal...

    Authors: M. L. Zettler and A. Bick
    Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367156
    Content type: OriginalPaper Published on:

  27. Spermatozoa of the trigonioid bivalveNeotrigonia margaritacea (Lamarck) (Trigoniidae, Trigonioida) are examined ultrastructurally. A cluster of discoidal, proacrosomal vesicles (between 9 to 15 in number) constit...

    Authors: J. M. Healy
    Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367155
    Content type: OriginalPaper Published on:

  28. In September 1993, 26 live specimens of the small, delicate sea anemoneHaliplanella luciae (Verrill, 1898) were sampled from the hull of a ship docked in Hamburg Harbour. After a worldwide journey the ship had pa...

    Authors: S. Gollasch and K. Riemann-Zürneck
    Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367154
    Content type: OriginalPaper Published on:

  29. Larvae of the Chinese mitten crabEriocheir sinensis were reared in the laboratory from the time of hatching and through metamorphosis. Development normally consists of a Prezoea, 5 Zoea stages, and a Megalopa. Oc...

    Authors: M. Montú, K. Anger and C. de Bakker
    Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367153
    Content type: OriginalPaper Published on:

  30. The structure, development, and host range of five newly detected species of the phagotrophic nanoflagellatePirsonia are described. They feed on planktic diatoms common in the North Sea:P. verrucosa sp. nov. (onR...

    Authors: S. F. Kühn, G. Drebes and E. Schnepf
    Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367152
    Content type: OriginalPaper Published on:

  31. The mesoparasitic copepodLernaeocera lusci (Bassett-Smith, 1896) was recovered from first-year bib (Trisopterus luscus L.) in the Voordelta (Southern Bight of the North Sea) from May until December 1989. Analysis...

    Authors: P. A. Van Damme, O. Hamerlynck and F. Ollevier
    Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367151
    Content type: OriginalPaper Published on:

  33. ThePseudo-nitzschia flora of the Skagerrak, North Atlantic, and adjacent waters, comprisingP. pungens, P. multiseries, P. seriata, P. fraudulenta, P. heimii, P. delicatissima, andP. pseudodelicatissima, has been ...

    Authors: G. R. Hasle, C. B. Lange and E. E. Syvertsen
    Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367149
    Content type: ReviewPaper Published on:

  34. Every year the Earth's rotation period is reduced, mainly due to the tidal drag of the moon. The length of day increases continuously by about 1 h every 200 million years. The period of rotation around the Sun...

    Authors: E. Costas, S. González-Gil, V. López-Rodas and A. Aguilera
    Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367140
    Content type: OriginalPaper Published on:

  35. Experiments were performed with the mesogastropodLittorina littorea on Helgoland, in Roscoff, and in the laboratory in order to evaluate the reaction of the female genital system to TBT, an environmental toxicant...

    Authors: U. Deutsch and P. Fioroni
    Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367139
    Content type: OriginalPaper Published on:

  36. Sulfide concentrations were measured in the inner and outer Königshafen (Sylt, Wadden Sea) from November 1990 to December 1991 to assess the fluctuations of sulfide levels in natural tidal habitats. Three diff...

    Authors: F. Thiermann, A. -S. Niemeyer and O. Giere
    Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367138
    Content type: OriginalPaper Published on:

  37. Parasites were observed in medium- and small-sized fish taken from the discards of a commercial shrimper during seven different cruises in the tidal channels of the North Frisian Wadden Sea (Süderaue, North Se...

    Authors: S. Groenewold, R. Berghahn and C. -D. Zander
    Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367137
    Content type: OriginalPaper Published on:

  40. Temperature requirements for growth, reproduction and formation of macrothalli of a day-neutral strain ofScytosiphon lomentaria from the Gulf of Thessaloniki were experimentally determined and correlated with the...

    Authors: S. Orfanidis, S. Haritonidis and I. Tsekos
    Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367134
    Content type: OriginalPaper Published on:

  41. The effect of the acclimation temperature on the temperature tolerance ofPorphyra leucosticta, and on the temperature requirements for growth and survival ofEnteromorpha linza was determined under laboratory cond...

    Authors: S. Orfanidis and S. Haritonidis
    Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367133
    Content type: OriginalPaper Published on:

  45. A study of research funding at Memorial University's Marine Sciences Research Laboratory shows that true costs far exceed support from grants and contracts alone. Research grant levels have to be matched by a ...

    Authors: R. L. Haedrich
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368368
    Content type: The Role of Marine Stations in Marine Research Published on:

  46. Jassa falcata andCorophium insidiosum are epifaunal tube-building marine amphipods, whose niches overlap in habitat and food requirements. Laboratory experiments were conducted to study the influence of the qual...

    Authors: I. Ulrich, K. Anger and U. Schöttler
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368364
    Content type: North Sea Ecology: Biodiversity, Biogeography Published on:
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Helgoland Marine Research

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