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Citation: Helgoländer Meeresuntersuchungen 1998 52(Suppl 1):BF02910518
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Distribution and ecological aspects of leptocephali collected 1979–1994 in North- and Central Atlantic. I. Congridae
This is the first report on the leptocephalus catches made during the last 15 years in North-and Central Atlantic during the course of 19 cruises of five different ships from Germany and one from Poland. This ...
Citation: Helgoländer Meeresuntersuchungen 1998 52:BF02908739 -
Age and growth rates of North Atlantic eel larvae (Anguilla spp.), based on published length data
The age of glass eels arriving at the European coasts is estimated by different authors to range from 3/4 to 3+years; some of these estimates are based on counts of “daily rings”. The present study reviews pub...
Citation: Helgoländer Meeresuntersuchungen 1998 52:BF02908738 -
“Cleaner” shrimps?
In the western North Atlantic, some shrimps of the genusPericlimenes interact with fishes. Accoring to prevailing wisdom, these shrimps “clean” the fishes (i.e. they remove parasites, diseased tissue, or detritus...
Citation: Helgoländer Meeresuntersuchungen 1998 52:BF02908736 -
A new stenothoid species related to the taxonRaumahara Barnard, from Australia (Crustacea, Amphipoda, Gammaridea)
Benthic samplings along the southern temperate coast of Australia yielded stenothoid specimens related to the taxonRaumahara Barnard. ?Raumahara virdurorum sp. n. is described, illustrated, and the systematic pos...
Citation: Helgoländer Meeresuntersuchungen 1998 52:BF02908735 -
A new species ofXantharus Andronov, 1981 (Copepoda: Calanoida) from the mesopelagic zone of the Antarctic Ocean
Xantharus renatehaassae sp. nov. is described from a female taken at mesopelagic depth of the Antarctic Sound. This is the second species within the genus to be described and the first record ofX...
Citation: Helgoländer Meeresuntersuchungen 1998 52:BF02908734 -
A congenital malformation of the systemic heart complex inSepia officinalis L. (Cephalopoda)
In semi-adultSepia officinalis L. (Cephalopoda) from the Bay of Arcachon (France) a congenital malformation of the systemic heart is described by macro-and microscopical methods. It concerns an atypical doubling ...
Citation: Helgoländer Meeresuntersuchungen 1998 52:BF02908733 -
Gyrodinium undulans Hulburt, a marine dinoflagellate feeding on the bloom-forming diatomOdontella aurita, and on copepod and rotifer eggs
The marine dinoflagellateGyrodinium undulans was discovered as a feeder on the planktonic diatomOdontella aurita. Every year, during winter and early spring, a certain percentage of cells of this bloom-forming di...
Citation: Helgoländer Meeresuntersuchungen 1998 52:BF02908731 -
Nematofauna in the Adriatic Sea: review and check-list of free-living nematode species
The present paper presents a collection and synthesis of data found in numerous publications on Adriatic Sea nematofauna, as well as unpublished, data mentioned in annotations. For this purpose, a chronologica...
Citation: Helgoländer Meeresuntersuchungen 1998 51:BF02908730 -
The influence of UV radiation on number and ultrastructure of the endosymbiotic dinoflagellates in the sea anemoneCereus pedunculatus (Anthozoa: Actiniaria)
The sea anemoneCereus pedunculatus was artificially UV-irradiated to test the effect of UV-light on the number of endosymbiotic dinoflagellates in its gastrodermis and on their ultrastructure. Anemones were kept ...
Citation: Helgoländer Meeresuntersuchungen 1998 51:BF02908729 -
Localization of digestion activities in polyps ofNausithoe planulophora andThecoscyphus zibrowii (Coronatae, Scyphozoa, Cnidaria)
Coronate polyps are unique among cnidarians in having a complete peridermal tube, a ring canal, and four radial canals or pores at their oral region. Moreover, most of these species possess tooth whorls that n...
Citation: Helgoländer Meeresuntersuchungen 1998 51:BF02908728 -
Influence of temperature on larval survival, development, and respiration inChasmagnathus granulata (Crustacea, Decapoda)
Larvae of an estuarine grapsid crabChasmagnathus granulata Dana 1851, from temperate and subtropical regions of South America, were reared in seawater (32/%.) at five different constant temperatures (12, 15, 18, ...
Citation: Helgoländer Meeresuntersuchungen 1998 51:BF02908727 -
Influence of initial substratum surface tension on marine micro- and macro-fouling in the Gulf of Thailand
The density of five major groups of fouling organisms (bacteria, diatoms, choanoflagellates, ciliates, macroorganisms) on seven artificial substrata with surface tensions between 19.0 and 64.5 mN m−1 was studied ...
Citation: Helgoländer Meeresuntersuchungen 1998 51:BF02908726 -
Relationship between bacteria, phytoplankton and heterotrophic nanoflagellates along the trophic gradient
Bacterial and heterotrophic nanoflagellates (HNF) abundance, as well as bacterial production and chlorophylla levels, were measured at five sites extending from the coastal zone toward the open Adriatic in the pe...
Citation: Helgoländer Meeresuntersuchungen 1998 51:BF02908725 -
Growth of juvenileArctica islandica under experimental conditions
In two laboratory experiments, the effects of temperature and food availability on the growth of 10- to 23-mm high specimens of the bivalveArctica islandica were estimated. Each experimental set-up consisted of 5...
Citation: Helgoländer Meeresuntersuchungen 1998 51:BF02908724 -
Long-term changes in the benthic communities of the Pomeranian Bay (Southern Baltic Sea)
Long-term changes in the macrofauna of the Pomeranian Bay were studied by comparing survey data from the 1950s, 1980s, and 1990s. The study area has undergone significant eutrophication during the period of in...
Citation: Helgoländer Meeresuntersuchungen 1998 51:BF02908723 -
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Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908722 -
Consumption of benthic fauna by carnivorous birds in the Wadden Sea
Consumption by carnivorous birds was estimated for the Sylt-Rømø tidal inlet in the northern part of the Wadden Sea, as well as the subarea Königshafen, a small, tidal bay. The bird community of the Sylt-Rømø ...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908721 -
Stable musselMytilus edulis beds in the Wadden Sea—They’re just for the birds
Predation by eiders, oystercatchers and herring gulls on natural mussel bedsMytilus edulis was studied in the Königshafen, a sheltered bay in the Wadden Sea. About 15 ha (2.5%) of the Königshafen were covered wit...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908720 -
Epibenthic fauna dredged from tidal channels in the Wadden Sea of Schleswig-Holstein: spatial patterns and a long-term decline
The epibenthic fauna dredged in the channels of the Wadden Sea of Schleswig-Holstein is dominated by crustaceans. Mean species richness is lower in a southern region (7.6±2.2 species haul−1) which is part of the ...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908719 -
Historical changes and inventory of macroalgae from Königshafen Bay in the northern Wadden Sea
Knowledge on the distribution, abundance and species richness of intertidal macroalgae occurring on sandy and muddy flats of the German Wadden Sea is still incomplete. We summarize published and unpublished in...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908718 -
Temporal variations in microbenthic metabolism and inorganic nitrogen fluxes in sandy and muddy sediments of a tidally dominated bay in the northern Wadden Sea
Factors controlling seasonal variations in benthic metabolism (O2 flux) and dissolved inorganic nitrogen (DIN) fluxes were examined during a 12–14 month period at three intertidal Wadden Sea stations. Since the f...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908717 -
Temporal and spatial variations of biodeposits—A preliminary investigation of the role of fecal pellets in the Sylt-Rømø tidal area
The fecal pellets ofHeteromastus filiformis andHydrobia ulvae are abundant on the sediment surface of the Sylt-Rømø tidal flats. AlthoughCerastoderma edule is present in most parts of the study area, only small a...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908716 -
Tidal variation in the settling diameters of suspended matter on a tidal mud flat
During one tidal period, measurements of the variation of current velocities, suspended sediment concentration and settling velocities of the suspended matter were carried out on a tidal mud flat 1.8 km west o...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908715 -
A fine-grained sediment budget for the Sylt-Rømø tidal basin
A budget for net accumulation of fine-grained sediment (<63 μm) has been set up for the Sylt-Rømø tidal basin. Net accumulation within the basin was computed from210Pb core dating and mapping of the intertidal an...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908714 -
The List tidal basin: a reference area for scientific research in the northern Wadden Sea
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908713 -
Effects of temperature and salinity on embryonic development of turbot (Scophthalmus maximus L.) from the North Sea, and comparisons with Baltic populations
Optimum temperature and salinity conditions for viable hatch were studied for turbot (Scophthalmus maximus L.) from the North Sea. Temperatures ranging from 6 to 22°C and salinities from 5 to 35‰ were used. Optim...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908710 -
Features, boundaries and connecting mechanisms of the Mauritanian Province exemplified by oceanic fish larvae
The Mauritanian Province, which comprises the area from the NW-African shelf to about 20°W and from Cape Timiris to Cape Verde, is redefined on the basis of fish larvae distribution patterns, direct and indire...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908709 -
Habitat choice by juvenile cod (Gadus morhua L.) on sandy soft bottoms with different vegetation types
Habitat choice by juvenile cod (Gadus morhua L.) on sandy bottoms with different vegetation types was studied in laboratory. The experiment was conducted day and night in flow-through tanks on two different size-...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908708 -
Lernaeocera branchialis (L., 1767) on cod in Baltic waters
Field surveys have shown a limited distribution ofL. branchialis in Baltic waters due to heterogenic salinity. The parasite is not suited as “natural” tagging of the cod population in these waters.
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908707 -
The influence of predation by herring gullsLarus argentatus and oystercatchersHaematopus ostralegus on a newly established musselMytilus edulis bed in autumn and winter
Predation by herring gullsLarus argentatus and oystercatchersHaematopus ostralegus was evaluated on a newly established musselMytilus edulis bed on tidal flats of the German Wadden Sea. The mussel bed covered an ...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908706 -
Tintinnina (Ciliophora, Protista) of the North Sea during the spring of 1986
This work is the first of a series in which the distribution patterns and the importance of the Tintinnina in the trophic chain of the North Sea are evaluated. In agreement with Foissner (1994), who stated “Mo...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908705 -
Population dynamics of the date mussel,Lithophaga lithophaga (L., 1758) (Bivalvia: Mytilidae), in the Evoikos Gulf (Greece)
Changes with time in aLithophaga lithophaga population, spatial distribution, size-frequency distribution and recruitment were studied. The population was homogenous, without statistically significant differences...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908704 -
Ultrastructural investigation of spermatogenesis in the nemerine wormProcephalothrix sp. (Palaeonemertini, Anopla)
Spermatogenesis and sperm structure of the nemertine wormProcephalothrix sp. were studied by transmission electron microscopy. It is shown that a flagellum and proacrosomal vesicles are common in spermatogonia an...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908703 -
Microgeographic allozyme differentiation in the hybrid zone ofMytilus galloprovincialis Lmk. andM. edulis L. on the continental European coast
The EuropeanMytilus galloprovincialis Lmk. andM. edulis L. coexist and hybridize in different proportions in extended areas of the British and Atlantic French coasts.M. galloprovincialis typical allozymes seem to...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908758 -
Effects of formaldehyde preservation on biometrical characters, biomass and biochemical composition ofAcartia clausi (Copepoda, Calanoida)
The effects of formaldehyde preservation on biometrical characters, biomass and biochemical composition of the marine copepodAcartia clausi were studied using the relevant values of fresh unpreserved animals as r...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908757 -
Ultrastructure of the spermatozoa ofCorystes cassivelaunus (Corystidae),Platepistoma nanum (Cancridae) andCancer pagurus (Cancridae) supports recognition of the Corystoidea (Crustacea, Brachyura, Heterotremata)
A combination of characters, not individually unique, possessed by the corystid,Corystes cassivelaunus, and the two cancrids,Platepistoma nanum andCancer pagurus, defines a corystoid-type of spermatozoon: the bas...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908756 -
Verbreitung von Makrozooplankton in der Grönlandsee im Spätherbst 1988 (Crustacea: Ostracoda, Hyperiidea [Amphipoda], Euphausiacea)
The horizontal and vertical distribution and the abundance of ostracods, hyperiids (amphipods) and euphausiids in the Greenland Sea along a transect parallel 74°45′N (from 15°45′E to 08°30′W) are described. Th...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908755 -
Vemakylindrus cantabricus, a new species of Diastylidae (Crustacea, Cumacea) from the northern Iberian coasts
Eleven species of the genusVemakylindrus Bacescu, 1961 are known at present. A hitherto unknown species is described herein asV. cantabricus, sp. nov., and is compared with the more closely related congeneric spe...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908754 -
A lectin histochemical study on carbohydrate moieties of the gonadotropin-like substance in the epithelial cells of Hatschek's pit ofBranchiostoma belcheri
The present light microscopic lectin, histochemical study suggests for the first time that the vertebrate gonadotropin-like substance in the basal part of the epithelial cells of Hatschek's pit is a sialic aci...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908753 -
Some observations on the seasonal distribution of dab,Limanda limanda, in the southern North Sea
The seasonal changes in the population structure of dab were observed in intervals of four to six weeks from January 1993 to November 1994 at a fixed station northwest of Helgoland. The sex distribution was ch...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908752 -
Seasonal variation in the occurrence of planktic bivalve larvae in the Schleswig-Holstein Wadden Sea
In the late 1980s, recruitment failures of the musselMytilus edulis led to economic problems in the mussel fishing and cultivation industries of northwestern Europe. As part of a collaborative study to gain a bet...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908751 -
Periodic and episodic benthos recruitment in southwest Mecklenburg Bay (western Baltic Sea)
Temporal changes in the zoobenthos of southwest Mecklenburg Bay were studied using routine survey data collected in 1980–94. Earlier studies suggested that long-term oxygen deficiency on the scale of several m...
Citation: Helgoländer Meeresuntersuchungen 1997 51:BF02908750 -
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Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367166 -
Cryptostylochus hullensis sp. nov. (Polycladida, Acotylea, Platyhelminthes): A possible case of transoceanic dispersal on a ship’s hull
In July 1993, the car carrier “Faust” entered Bremerhaven after a voyage from the North-American Atlantic coast to Europe. In a dockyard, five living specimens of the order Polycladida were collected from the ...
Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367165 -
Studies on the larval development of northeastern Atlantic and Mediterranean Procellanidae (Decapoda, Anomura). I — Redescription of the larval stages ofPorcellana platycheles (Pennant, 1777) reared under laboratory conditions
The complete larval development is described forPorcellana platycheles (Pennant) reared under laboratory conditions. The development consists of two zoeal stages and one megalopa. At 20°C and 35‰ salinity, the me...
Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367164 -
Population structure and reproduction ofCalanus helgolandicus (Copepoda, Calanoida) along the iberian and Moroccan slope
During three cruises, carried out in March 1991, October 1991, and January 1992 off the Iberian Peninsula and Morocco, the abundant calanoid copepodCalanus helgolandicus (Claus) was collected from a depth of 1000...
Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367161 -
A benthic sled for sampling soft bottoms
A new benthic sled is described.Favourable features of the sled include: simple operation, broad runners, balanced towing position, simple height adjustment of the sediment cutting edge and quick exchange of t...
Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367160 -
The macrofauna of a stony sand area in the German Bight (North Sea)
The sublittoral macrofauna of the Steingrund, a stony area east-northeast of Helgoland, was investigated from May till October 1991 using a van Veen grab and a small dredge. The diverse endo- and epifauna of t...
Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367159 -
A new diagnosis of the genusDelectona (Porifera, Demospongiae), with a description of a new species from the Alboran Sea (western Mediterranean)
A redescription of the genusDelectona is provided, based on information gained by the finding of a new species,D. alboransis, from the Alboran Sea (southwestern Mediterranean Sea). Up to now, this genus contained...
Citation: Helgoländer Meeresuntersuchungen 1996 50:BF02367158