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  • 1
    Book
    Book
    The role of the lesser weever tranchinus vipera and the dab limanda limanda in the benthic system of the southern North Sea (1986)
    Details Availability
    Type of Medium: Book
    Series Statement: ICES council meeting papers 1986,4
    Language: Undetermined
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  • 2
    Book
    Book
    Report on an intercalibration exercise on methods for determining ashfree dry weight of macrozoobenthos (1987)
    Details Availability
    Type of Medium: Book
    Series Statement: ICES council meeting papers 1987(39)
    Language: English
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  • 3
    Electronic Resource
    Electronic Resource
    Nucleic acids and ATP to assess microbial biomass and activity in a marine biosedimentary system (2000)
    Springer
    Marine biology 137 (2000), S. 1111-1123 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Sedimentary DNA, RNA and ATP concentrations were measured at six stations on a tidal flat in the German Wadden Sea from April to December 1995 to determine factors controlling microbial abundance and activity. Two stations (1 and 2) were located in a mussel bed (Mytilus edulis) in the middle of the flat, and the other four were arranged in a line following ebb tide direction. DNA and ATP concentrations were converted into carbon equivalents using literature coefficients and considered to represent total microbial biomass and viable microbial biomass, respectively. The difference between CDNA and CATP was considered as detrital biomass. CDNA and detrital CDNA biomass both increased from spring to summer and decreased in autumn to reach lowest values in December. The most prominent seasonal increase was observed at the mussel bed stations and two adjacent stations. CATP biomass peaked in early spring, especially at the mussel bed stations, and showed a secondary peak in summer. Regression analysis yielded a highly significant relation between the silt content of the sediment and CDNA and CATP. However, CDNA and CATP biomass are not correlated if silt is taken into account. The relation between silt and microbial biomass in combination with the decrease of the silt content with distance from the mussel bed indicate the importance of mussel beds for the microbial activity on the tidal flat, most likely through deposition of feces and pseudofeces. The low silt content and microbial biomass in winter are attributed to resuspension events. The zero intercepts of the regressions between DNA and ATP or RNA suggest that extracellular DNA is absent in our samples. Hence, detrital CDNA biomass in our samples probably consists of intact but dormant cells. Compared to other marine habitats the percentage of detrital CDNA biomass on the tidal flat is quite high, i.e. up to 〉95% of the total CDNA. However some doubt is expressed about the validity of factors used to convert ATP and DNA to carbon. The proportion of active biomass, expressed by the ratio CATP/CDNA being the complement of the detrital CDNA percentage shows a steady decrease with time and with diminishing distance towards the mussel beds. The role of a mussel bed as a biosedimentary system influencing spatial and temporal trends in specific activity is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270000395
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Introduction into the ecosystem of the North Sea: Hydrography, biota, and food web relationships (1992)
    Springer
    Aquatic ecology 26 (1992), S. 7-18 
    Details
    ISSN: 1573-5125
    Keywords: North Sea ; ecosystem ; hydrography ; food web ; environmental impact
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The North Sea, one of the most productive of the earth's seas and oceans, is also surrounded by some of earth's most densely populated and heavily industrialized regions. A growing number of signals are being received which indicate that this valuable ecosystem is increasingly under stress. This has generated a corresponding increase in concern over the steps to be taken to protect the North Sea. While there are divergent views on what constitutes an ‘ideal’ North Sea, there is a general recognition that any decisions that are made should be based on a good understanding of this ecosystem. The intention of this paper is to give an overview of what is presently known, and to identify areas where more studies are needed. A brief summary of the hydrography and the biota of the North Sea is given. Biotic and abiotic structure justify partitioning the North Sea into three ecologically different regions: southern, central, and northern. For the most part, neither the top predators,e.g. marine birds and mammals, nor the macroalgae and sea grasses are included in this overview.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02298024
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  • 5
    Electronic Resource
    Electronic Resource
    Primary production and distribution of phytopigments in the water column and sediments on the upwelling shelf off the Mauritanian coast (Northwest Africa) (1993)
    Springer
    Hydrobiologia 258 (1993), S. 81-93 
    Details
    ISSN: 1573-5117
    Keywords: primary production ; plant pigments ; sediment trap ; Mauritanian shelf
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In May 1988, water and sediments of the shelf area off the Banc d'Arguin were studied for plant pigments and organic carbon. Phytoplankton primary production was also measured and sedimentation of organic matter was estimated using moored sediment traps. On the basis of simultaneous hydrographic measurements, two water types could be distinguished. Upwelling water covered the southern shelf and the outer part of the northern shelf. The other water type had more coastal characteristics and covered the inshore part of the northern transect. The distribution of chlorophyll a and particulate organic carbon conformed with the distribution of the two water types. A similarity analysis of the pigments from the sediment traps showed a difference in the composition of the algal material depositing from the two water types. The primary production was also found to be distinctly different, i.e. higher in the coastal water type. The pigments in the surface sediments did not reflect the respective overlying water types due to the increasing accumulation of pigments at the offshore stations of the northern transect. This accumulation seems to correspond with the progressive reduction of the benthic respiratory activity in an offshore direction. Along the southern transect such a relation could not be established, i.e. pigment accumulation along the shelf edge was not apparent. Special attention was paid to the presence of specific seagrass pigments on the shelf. No evidence for a major influx of seagrass material was found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006188
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  • 6
    Electronic Resource
    Electronic Resource
    The benthic infauna and benthic respiration off the Banc d'Arguin (Mauritania, Northwest Africa) (1993)
    Springer
    Hydrobiologia 258 (1993), S. 107-117 
    Details
    ISSN: 1573-5117
    Keywords: macrofauna ; meiofauna ; benthic respiration ; Mauritanian shelf
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In May 1988, a study was made of the benthic community structure and benthic respiratory activity along two transects across the Mauritanian shelf off Banc d'Arguin. The main emphasis of the present paper is put on the macrobenthos, but results of a gross analysis of the meibenthos are discussed as well. Macrofaunal and meiofaunal density showed no consistent decrease with distance from the shore. The composition of the macrofauna taxa appeared to be closely correlated with sediment parameters and less so with depth. The highest macrofaunal biomass was found at the northern edge of the Banc d'Arguin, and the lowest biomass along the outer shelf. The biomass levels on the shelf match the ones reported for the northern Cap Blanc area where, in contrast to the seasonal upwelling in the investigated area, upwelling takes place all year round. Benthic respiration rates on the offshore shelf were relatively high at the nearshore stations and low near the shelf break. Experimental evidence suggests that the low O2 levels in the upwelling water covering part of shelf, inhibited benthic respiration. The high respiratory activity at some northern inshore stations coincided with the presence of oxygen-rich coastal water. In this area benthic respiration surpassed the level previously reported for the enriched Cap Blanc area. On the basis of our respiration data, an estimate is made of the total carbon demand of the benthic community on the shelf in May and this quantity is compared with the measurements of daily primary production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006190
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  • 7
    Electronic Resource
    Electronic Resource
    The trawlfauna of the Mauritanian shelf (Northwest Africa): density, species composition, and biomass (1993)
    Springer
    Hydrobiologia 258 (1993), S. 165-173 
    Details
    ISSN: 1573-5117
    Keywords: trawlfauna ; Mauritanian shelf
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In May 1988, epifaunal trawlsamples were collected at 17 stations on the Mauritanian shelf off the Banc d'Arguin. The species composition and biomass of the invertebrates and demersal fish were analysed. On the basis of species abundances, three station groups could be distinguished each corresponding to a subregion of the shelf: an inner shelf, a midshelf and an outer shelf station group. The average depth increased from 20 m for the inner to more than 100 m for the outer shelf stations. The biomass of mobile epifauna and fish was lowest on the inner shelf stations where the trawlfauna was dominated by large sessile filterfeeders. The trawlfaunas of the mid- and outer shelf were more similar in species composition. Demersal fish and crustaceans appeared to be more abundant on the outer shelf. The increase in density and biomass from inner to outer shelf is discussed in relation to the distribution of the infauna and the hydrographical conditions on the Mauritanian shelf. Being a demersal fishing area, density and biomass of the epifauna on the shelf are compared with that of the demersal fishing grounds in the southern North Sea. The result of this comparison shows that, except for echinoderms, all taxa attain higher densities and biomasses at the Mauritanian shelf.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006194
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  • 8
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    Assessing evidence for random assembly of marine benthic communities from regional species pools (2009)
    Inter Research
    In:  Marine Ecology Progress Series, 382 . pp. 279-286.
    Details
    Publication Date: 2018-06-01
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.3354/meps07934
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  • 9
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    The benthic infauna of the North Sea: species distribution and assemblages (1992)
    Oxford Univ. Press
    In:  ICES Journal of Marine Science, 49 (2). pp. 127-143.
    Details
    Publication Date: 2018-03-21
    Description: In 1986 participants of the Benthos Ecology Working Group of ICES conducted a synoptic mapping of the infauna of the southern and central North Sea. Together with a mapping of the infauna of the northern North Sea by Eleftheriou and Basford (1989) this provides the database for the description of the benthic infauna of the whole North Sea in this paper. Division of the infauna into assemblages by TWINSPAN analysis separated northern assemblages from southern assemblages along the 70 m depth contour. Assemblages were further separated by the 30, 50 m and 100 m depth contour as well as by the sediment type. In addition to widely distributed species, cold water species do not occur further south than the northern edge of the Dogger Bank, which corresponds to the 50 m depth contour. Warm water species were not found north of the 100 m depth contour. Some species occur on all types of sediment but most are restricted to a special sedimentand therefore these species are limited in their distribution. The factors structuring species distributions and assemblages seem to be temperature, the influence of different water masses, e.g. Atlantic water, the type of sediment and the food supply to the benthos. Eleftheriou, A. and Basford, D. J. Journal of the Marine Biological Association of the UK, 69: 123–143.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1093/icesjms/49.2.127
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  • 10
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    Trends in biomass, density and diversity of North Sea macrofauna (1992)
    Oxford Univ. Press
    In:  ICES Journal of Marine Science, 49 (1). pp. 13-22.
    Details
    Publication Date: 2018-03-19
    Description: Total biomass and biomass of large taxonomic groups (polychaetes, molluscs, crustaceans, echinoderms) and species diversity of the macrofauna were determined for almost 200 North Sea stations sampled synoptically by seven vessels during Spring 1986 and for 120 additional stations sampled in earlier years by the Marine Laboratory in Aberdeen. There exists a clear and significant decreasing trend in biomass with latitude, both in total biomass and for the different taxonomic groups. Apart from latitude, sediment composition and chlorophyll a content of the sediment also infuence total biomass and biomass of most groups significantly. Biomass increases consistently in finer sediments and sediments with a higher chlorophyll a content. The same trends are found for the results within laboratories. Some interaction exists, indicating weak laboratory and zonal effects. Diversity, as measured by Hill's diversity index N1 = (exp H′) shows a clear and significant trend with latitude. Towards the north of the North Sea diversity increases considerably. The trend is also found for laboratories separately and is everywhere equally strong. Also longitude and depth show an effect on diversity. Sediment variables have no clear influence on diversity. Other diversity measures show the same trend but are more variable than N1,. Total density tends to increase towards the north, but sediment related variables have a larger influence. Mean individual weight becomes considerably smaller towards the northern part of the North Sea.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1093/icesjms/49.1.13
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