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Material flux rates in an intertidal mussel bed were measured synchronously over two tidal cycles in June 1989 with Benthic Ecosystem Tunnels and a double lane flume. The tunnels enclosed the near bottom water...
The muricid gastropodOcenebra erinacea exhibits imposex (occurrence of male parts in addition to the female genital duct), a phenomenon which is caused by tributyltin (TBT)-compounds leached from ships’ antifouli...
Laboratory investigations were performed to gain insight into the mechanisms which govern the survival of marine bacteriophages in nature. Samples collected in 1988 to 1990 at station “Kabeltonne” near Helgola...
The guillemot colony on Helgoland, Germany, was visited from June 5th to 21st 1990. The presence of adults and food delivery to chicks was studied on a ledge holding about 50 breeding pairs. Attendance varied ...
As part of NOAA's Status and Trends Program, oysters were sampled from 43 sites throughout the Gulf of Mexico from Brownsville, Texas, to the Florida Everglades from 1986 to 1989. Oysters were analysed for bod...
Spermatogenesis in the lugwormArenicola marina, in common with other members of Arenicolidae, occurs in the coelomic fluid and results in the formation of discs of mature spermatozoa known as a morulae. Within a ...
The structure of spermatozoa is described for two species of polynoid polychaete,Harmothoe imbricata andHarmothoe impar, from material fixed and examined by both scanning and transmission electron microscopy. The...
The macrofauna communities on the Dogger Bank in April/May 1985–87 were compared with those in April/May 1950–54 (Ursin, 1960). Unpublished data from Birkett on the central and western Dogger Bank from April/M...
From March to July 1989 (JGOFS pilot study), measurements were carried out on the oxygen uptake of natural zooplankton communities on five drifting stations (about three weeks each) in the Atlantic from 18°N t...
In the summer months of 1984, 1986, 1987 and 1988, several stations off the west coast of Schleswig-Holstein were investigated with regard to the situation of ortho-phosphate, reactive silicate and mesozooplan...
Three new species are described:Lagisca zibrowii (Polynoidae) andProcerastea hydrozoicola andP. parasimpliseta (Syllidae), living in association with a calcified hydrozoan, probably of the genusPseudosolanderia (...
During a North Sea survey in late spring 1986, zooplankton biomass (g dry weight/m2) as well as pollutant concentrations in zooplankton (ng/g dry weight) were determined at 127 stations. On the basis of these dat...
The feeding habits of the Mediterranean sea anemonesCereus pedunculatus, Actinia equina andAnemonia viridis were examined mainly by analysing their coelenteron contents. The three species are opportunistic omnivo...
The thermal characteristics of a trypsin-like protease were surveyed comparatively in two hermit crabs,Pagurus bernhardus (Linné) 1758 from the German Bight, andClibanarius striolatus Dana 1852 from the Western I...
Growth rate expressed as dry weight, elemetnal composition (C, N, H), protein content and nucleotide composition (ATP, ADP, AMP, CTP, GTP and UTP) as well as adenosine were measured in laboratory culturedHyas ara...
Early (instar I and II) juveniles of the spider crabHyas araneus were reared under constant conditions (12 °C, 32‰S) in the laboratory, and their growth, biochemical composition, and respiration were studied. Eve...
Virus infections were detected inEctocarpus siliculosus andEctocarpus fasciculatus on the coasts of Ireland, California, Peru, southern South America, Australia and New Zealand; in threeFeldmannia species on the ...
The influence of three bacteria strains (Helgo 21, NCMB 308 and NCMB 13) on the life cycle ofTisbe holothuriae Humes 1957 was investigated under constant experimental conditions (19–20°C and 38‰ S). For each of t...
During a three-year plankton monitoring at the island of Helgoland (German Bight, North Sea), pelagic larvae ofScoloplos armiger (O. F. Müller, 1776) were observed to occur regularly from February to April. Up to...
The morphology and function of the female reproductive organs in 6Protodrilus species are investigated by light- and transmission electron microscopy. Possible ways in which spermatozoa may enter the female coelo...
Mytilus galloprovincialis Lmk. were maintained in the laboratory for three months in a semicontinuous water flow system. Animals were fed a commercial filter-feeder food and sampled after 0, 21, 35, 49, 77, and ...
The organization of the zooxanthellate scleractinian coralLeptoseris fragilis was studied. The architecture of the corallite and the histology of the polyparium were analysed for adaptations that enable efficient...
In a preliminary survey, conducted between August 28 and October 9, 1990, the concentration of bacteriophages in seawater sampled at intervals of 1 to 4 days near Helgoland (station Kabeltonne) was determined ...
As part of an interdisciplinary research programme, lead contents were measured in the polychaeteNephtys spp. and in the sea-urchinEchinocardium cordatum as well as in the respective sediment fractions <20 μm tak...
Comparative investigations on the physiological capacities in the euryhaline amphipodsGammarus locusta, G. oceanicus, G. salinus, G. zaddachi andG. duebeni were reviewed. In order to assess the adaptations of the...
The association betweenAcyrtus rubiginosus (Gobiesocidae),Clastotoechus vanderhorsti (Porcellanidae),Ophiothrix sp. (Ophiotrichidae) and their rock-boring hostEchinometra lucunter (Echinometridae) has been studie...
The gut content of nearly 2000 specimens ofEnoplus brevis was quantitatively analysed.E. brevis is an opportunistic omnivore. Main food categories found were cyanobacteria, diatoms, oligochaetes, nematodes, and r...
The harpacticoid copepodTisbe holothuriae was collected from Saronicos Gulf (Greece) and reared under constant laboratory conditions. In order to study the effects of food on the population dynamics, seven diets ...
In the Helgoland region eight sublittoral hard substrate communities occur. These communities were stationary in time during the years 1987–1989. The major governing parameters are the available amount of dayl...
The surface deposit feeding speciesPygospio elegans andMacoma balthica are dominant members of many sandy bottom communities of northern boreal regions. The feeding mode of both species and the tube-building ofP....
The daily food intake and feeding activities of the common gobyPomatoschistus microps (Krøyer) and the nine-spined sticklebackPungitius pungitius (L.) were investigated in the brackish Schlei fjord. At the invest...
Chromosome numbers are given for four species ofChaetomorpha from the warm temperate and tropical western Atlantic. The basic chromosome number is six, with three median and three submedian chromosomes.Chaetomorp...
Chaetognaths mainly keep to a preferred depth range by movement and resistance achieved by body shape. Some species, for exampleSagitta lyra andS. hexaptera, developed conspicuous, voluminous, gelatinous inner pa...
The genusHeterokrohnia Ritter-Záhony, 1911 is redefined and the speciesH. mirabilis Ritter-Záhony, 1911 redescribed. The redescription is based upon the type specimens from Antarctic waters and additional specime...
The characters which have been advanced to separateArcheterokrohnia Casanova, 1986, fromHeterokrohnia Ritter-Záhony, 1911, are discussed; they are considered to be insufficient to warrant the erection of a separa...
A taxonomic study on stenothoid amphipods from the area of South Shetland Islands (Antarctica), led to the description ofThaumatelsonella kingelepha gen. and sp. nov. The systematic position ofPseudothaumatelson ...
The post-naupliar developmental stages of the Calanoid copepodDrepanopus forcipatus Giesbrecht are described. They are compared with copepodids of other members of the family Clausocalanidae. The sequence of appe...
The present paper deals with ostracods collected by H. Kunz during October and November 1979 on the Hawaiian Islands (Big Island, Maui and Kauai). 26 species were found, nine species are described, two were al...
The present paper deals with the taxonomy of the ostracod family Paradoxostomatidae Brady & Norman, 1889 from the coral reefs around Lizard Island, northern Great Barrier Reef, Australia. 18 species were found...
This paper deals with the taxonomy of the ostracod families Cytherellidae, Cytheridae, Cytheromatidae, Cytherideidae, Krithidae, Loxoconchidae, Paracytherideidae, Cytheruridae, Pectocytheridae and Bythocytheri...
A total of 27 halacarid species were found in sediments taken at 5–25 m depth off the western coast of Sweden. The four speciesCopidognathus magnipalpus, Actacarus obductus, Coloboceras longiusculus, andLohmannel...
Twelve species ofNephtys now known from northern Europe are described, including one new species,N. pulchra sp. n. A key is provided to the 14 species of Nephtyidae, from the region. Geographic changes in the set...
A new species of the genusSyllis is described feeding on a colony of corals of the genusXenia (Xeniidae, Alcyonaria) in the coral aquarium of the Löbbecke Museum Düsseldorf. The origin of the corals is very proba...
19 species were found; 2 of them are new to science (Scolelepis brevibranchia, Scolelepis crenulata). Additional descriptions of the parapodial lobes of the little-known speciesAglaophamus peruana are given.Hemip...
This revision of sevenPorphyra species of Helgoland was based on a study of the structure of their fertile thalli and the behaviour of their spores. Regarding the reproductive organization the species may be arra...
20 fouling organisms were observed on plastic litter dredged from the Elbe estuary during July 1990; 60% of the species were typical sessile hard bottom organisms. Most individuals found on this artificial har...
The new speciesSaccactis coliumensis is described with an emendation of genusSaccactis lager, 1911 (family Actiniidae). The taxonomic relations of the genus are discussed giving additional information onIsoulacti...
An instrument is described, which collects water from the benthic boundary layer in shallow waters with a maximum depth of 50 m. Four water samples of 71 each can be collected between 5 cm and 40 cm above the ...
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