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  • 1
    Electronic Resource
    Electronic Resource
    Chemical monitoring in the Dutch Wadden Sea by means of benthic invertebrates and fish (1989)
    Springer
    Helgoland marine research 43 (1989), S. 435-446 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In monitoring, it is of utmost importance to carefully define the purpose, the sampling strategy, as well as the analytical chemical and statistical requirements. Surveys are appropriate for describing the geographical variation in environmental contaminant levels. Repeated surveys and recurrentdata collection at permanent locations provide means of detecting temporal trends. Results are presented here of surveys on pollution by trace metals, polychlorinated biphenyls and organochlorine pesticides in the Ems Estuary and Dutch Wadden Sea usingMytilus edulis, Mya arenaria, Arenicoia marina, Nereis diversicolor andCrangon crangon as test organisms. Trends towards decreasing pollution by mercury are illustrated by monitoring data onMytilus edulis andZoarces viviparus. It is stressed that the results of chemical monitoring in organisms may be interpreted only in termser the biological effects on the basis of relevant toxicological knowledge and/or additional bio-assays.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02365902
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Estuarine nematodes as indicators of organic pollution; An example from the Ems estuary (The Netherlands) (1994)
    Springer
    Aquatic ecology 28 (1994), S. 213-219 
    Details
    ISSN: 1573-5125
    Keywords: Estuarine nematodes ; organic pollution ; Ems estuary ; diversity ; maturity index ; Eudiplogaster pararmatus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A comparison is made of the structure and abundance of the nematode community of an intertidal, brackish-water mudflat in the Ems estuary under conditions of high (1980) and reduced (1987) organic waste input. Three stations, at different distances from the waste water inlet, were sampled monthly; nematodes were identified and counted in the upper 1 cm of the sediment. In 1987, numerical density of nematodes was lower, and species diversity was higher than in 1980. Diatom eating nematode species dominated in 1980, to decrease by 1987.Eudiplogaster pararmatus, an indicator of organic enrichment, also decreased strongly. The response of the nematode community to reduced organic waste input could be adequately described with the BONGERS' Maturity Index.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02333992
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Distribution and life cycle of the North American Spionid polychaeteMarenzelleria viridis (Verrill, 1873) in the Ems estuary (1993)
    Springer
    Aquatic ecology 27 (1993), S. 237-246 
    Details
    ISSN: 1573-5125
    Keywords: Marenzelleria viridis ; distribution ; life cycle ; Ems estuary
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In 1983 the first specimens of the North American spionid polychaeteMarenzelleria viridis were found along the European mainland shore in the Ems estuary. Since then, this polychaete has spread over several estuaries around the North Sea and the Baltic. In the inner part of the Ems estuary juveniles were predominantly present in muddy sediments high in the intertidal zone; in more sandy sediments at higher salinities juveniles and adults co-occured. Detailed information was obtained at a muddy and at a sandy station. Gametes were present in the coelomic fluid from November through March. In May new recruits were found in the sediment samples, reaching densities of over 105 M−2 at the muddy station, andc. 2000 m−2 at the sandy station. During summer, densities decreased at the muddy station, coinciding with a density increase at the sandy station, suggesting migration of juveniles from a nursery to the adult habitat. Cage experiments showed that the decrease of juveniles at the muddy station could be attributed to migration and not to mortality due to predation. At the sandy habitat palps and anterior parts ofM. viridis made up 4–11% of the stomach content of juvenile plaice (Pleuronectes platessa). In juvenile flounder (Platichthys flesus) only in Aprilc. 10% of the stomach content consisted ofM. viridis. During 1983–1990 increasing densities ofM. viridis at the sandy habitat coincided with a reduced abundance ofNereis diversicolor, however, this inverse relationship was not found to be statistically significant. Density fluctuations ofM. viridis andCorophium volutator showed a significant positive relationship, the cause of which is not yet understood.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02334787
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  • 4
    Electronic Resource
    Electronic Resource
    Changes in estuarine nematode communities following a decrease of organic pollution (1998)
    Springer
    Aquatic ecology 32 (1998), S. 195-202 
    Details
    ISSN: 1573-5125
    Keywords: estuarine nematodes ; organic pollution ; Ems estuary ; maturity index ; succession
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The response of a nematode community to a decreasing organic matter loading was studied. Monthly observations were made at three stations at an intertidal brackish-water mudflat in the Ems estuary in 1980 (highly polluted), 1987 (moderately polluted) and 1993 (no significant pollution). Nematodes were identified and counted in the upper 1 cm of the sediment. The decrease of organic pollution was followed by an increase in species diversity, whereas numerical densities decreased. Diatom eating nematodes, being dominant under eutrophic conditions in 1980, decreased strongly, partly as a consequence of decreasing diatom standing stock. Eudiplogaster pararmatus, an indicator of organic enrichment, decreased strongly to disappear completely in 1993. Bonger's maturity index was used to describe the response of the nematode community. At 2 most polluted stations a strong response was observed from 1980 to 1987: a decrease of ‘colonizer’ species. After 1987, although ‘persister’ species increased, no further development towards a more ‘natural succession’ type community occurred, probably due to the natural stress of the habitat (high mudflat, low salinities).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009901207217
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    Paper (German National Licenses)
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