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  • 2000-2004  (5)
  • 1
    Online Resource
    Online Resource
    Das Benthos der Kieler Förde und der Schlei im Vergleich (2003)
    Kiel
    Details Availability
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (87 Seiten = 4 MB) , Graphen, Karten
    Edition: 2021
    URL: https://oceanrep.geomar.de/54368/
    Language: German
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  • 2
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    Fish farming impacts in the Mediterranean studied through sediment profiling imagery (2002)
    Inter Research
    In:  Marine Ecology Progress Series, 227 . pp. 125-133.
    Details
    Publication Date: 2018-05-28
    Description: The sediment beneath and at various distances from the fish farm cages in Cephalonia bay (Eastern Mediterranean) was investigated seasonally through sediment profiling imagery (SPI) as well as through monitoring of geochemical variables and macrofaunal assemblages. The SPI images (SPI) repeatedly showed the same qualitative pattern along the benthic enrichment gradient with readily identifiable attributes such as depth of dark sediment, signs of outgassing and bioturbation marks. Quantitative comparisons showed that a large number of SPI attributes showed significant positive or negative correlation with geochemical and biological attributes describing the effect of fish farming on the seabed. All multivariate patterns obtained through the analysis of SPI attributes were highly correlated to those obtained from standard multivariate analysis of macrofauna during the respective seasons. It is argued that SPI provides an integrated assessment of the sedimentary conditions and therefore may be used as a complement of or even a substitute for standard sampling methods when mapping the effects of aquaculture on silty substrates
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.3354/meps227125
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Ausmaß der Steinfischerei an der schleswig-holsteinischen Ostseeküste (2003)
    Landesamt für Natur und Umwelt des Landes Schleswig-Holstein
    In:  Jahresbericht Landesamt für Natur und Umwelt des Landes Schleswig-Holstein, 2003 . pp. 111-116.
    Details
    Publication Date: 2017-10-06
    Type: Article , NonPeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - without review
  • 4
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    Estimating species richness, abundance and diversity with 70 macrobenthic replicates in the Western Baltic Sea (2001)
    Inter Research
    In:  Marine Ecology Progress Series, 214 . pp. 103-110.
    Details
    Publication Date: 2018-05-28
    Description: An unusually large number of replicated macrofaunal samples (70) was taken from the Western Baltic in May 1995 for a ringtest in an ICES/HELCOM intercalibration exercise. This data set was employed in this study in order to investigate the performance of numerical methods used for predicting species richness and to assess the accuracy of the estimates of abundance and diversity currently used in benthic ecology. The results of this study indicate that: (1) more than 10 replicates are required in order to include in the data set more than two-thirds of the species found in 70 replicates, and more than 53 replicates are required in order to include 95% of the species; (2) estimates of average abundance and of average Shannon-Wiener diversity index using 5 replicates could result in less than 40% error; this could be less than 30% for 10 replicates and less than 5% for 70 replicates; (3) both types of species-richness predictions (jackknife estimate and S 0) increased with increasing number of samples used in the calculations, indicating that their ability to assess overall species richness in the community is rather limited; in particular, it is shown that jackknife overestimates and S0 slightly underestimates species richness. Different configurations of the S0 method were tested in order to optimize its performance, and it was found that both truncation and increasing sampling lag result in increased and stabilized estimates of species richness.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.3354/meps214103
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    The impact of trawl fishery on the epifauna of the southern North Sea (2000)
    Oxford Univ. Press
    In:  ICES Journal of Marine Science, 57 . pp. 1389-1394.
    Details
    Publication Date: 2019-09-23
    Description: Qualitative historical benthos data (1902–1912) were compared with recent data (1986) to find long-term trends in epifauna species composition in the southern North Sea that may be attributed to fishery-induced changes. In general, the frequency of occurrence of bivalve species declined, whereas scavenger and predator species (crustaceans, gastropods, and sea stars) were observed more frequently in 1986. We suggest that these shifts can be attributed not only to the physical fishery impact, but also to the additional potential food for scavenging and predator species provided by the large amounts of discards and moribund benthos. Our findings are put into the perspective of the general development of the demersal fishery in the southern North Sea. Despite the problems with the historical data set, the comparison presented may be the best illustration achievable of the changes in the benthos from a near-pristine situation to the present conditions after long-term disturbance.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1006/jmsc.2000.0930
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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