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  • 1995-1999  (3)
Document type
Keywords
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Language
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Year
  • 1
    Book
    Book
    Modification of carbonate substrata by bioerosion and bioaccretion on coral reefs of the Red Sea : = Modifikation karbonatischer Substrate durch Bioerosion und Bioakkretion in Korallenriffen des Roten Meeres (1998)
    Aachen : Shaker
    Details Availability
    Keywords: Dissertation ; Hochschulschrift ; Golf von Akaba ; Korallenriff ; Carbonate ; Erosion ; Biologisches System ; Golf von Akaba ; Korallenriff ; Carbonate ; Akkretion ; Biologisches System
    Type of Medium: Book
    Pages: 126 S., 2 Bl , Ill. (farb.), graph. Darst., Kt , 21 cm
    Edition: Als Ms. gedr
    ISBN: 3826532864
    Series Statement: Berichte aus der Geowissenschaft
    Language: English , German
    Note: Zsfassung in deutscher Spr. S. I - II , Zugl.: Kiel, Univ., Diss., 1997
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  • 2
    Online Resource
    Online Resource
    Modification of carbonate substrata by bioerosion and bioaccretion on coral reefs of the Red Sea : = Modifikation karbonatischer Substrate durch Bioerosion und Bioakkretion in Korallenriffen des Roten Meeres (1997)
    Kiel
    Details Availability
    Keywords: Dissertation ; Hochschulschrift ; Golf von Akaba ; Korallenriff ; Carbonate ; Akkretion ; Biologisches System
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (136 Seiten = 9 MB) , Illustrationen, Graphen, Karte
    Edition: Online-Ausgabe 2023
    URL: https://oceanrep.geomar.de/id/eprint/58870/
    Language: English
    Note: Zusammenfassung in deutscher und englischer Sprache
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  • 3
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    Modification of carbonate substrata by bioerosion and bioaccretion on coral reefs of the Red Sea = Modifikation karbonatischer Substrate durch Bioerosion und Bioakkretion in Korallenriffen des Roten Meeres (1997)
    Details
    Publication Date: 2023-07-11
    Description: The modification of carbonate substrata by bioerosion and bioaccretion was investigated on the fringing reef off Aqaba, Northern Gulf of Aqaba (Jordan). For this purpose, experimental substrates (uniform blocks of dead coral) were submerged at various water depths for a period of one and two years. Bioerosion and bioaccretion were found to vary highly between depths and years. Bioerosion was found preferentially on the upper sides of the substrates, wheras bioaccreting organisms dominated on the lower sides. Bioerosion was dominated by the grazing sea urchin Diadema setosum during both years. Bioerosion rates were higher during the second year of exposure at all depths. Serpulids and bivalves were the principal accreting organisms. Bioaccretion rates were highest at 40 m water depth during both years. The differences and variations found for bioerosion are related 1) to the density and size of the grazers, 2) to the accessibility of the substrates to the grazers and 3) to the abundance of algae. Bioaccretion was mainly controlled by 1) grazing pressure and by 2) spatial competition betvveen colonising organisms. The different interactions between bioerosion and bioaccretion result in great differences in the modification of the carbonate substrate. Bioerosion by boring organisms was quantified for the massive scleractinian coral Porites lutea from Aqaba. Computed Tomography, a medical-radiological method, was optimised for the quantification of bore-holes. The percent of the colonies bored was found to increase with water depth. Bioerosion and bioaccretion of experimental substrates were compared between Aqaba and two sites off Zabargad Island (Central Red Sea, Egypt). The three sites differed quantitatively as well as qualitatively. At Zabargad, the main grazers were fishes and the principal colonisers of the substrates were coralline algae. The average bioerosion rate over all exposure depths was higher at Aqaba than at the Zabargad sites. The spatial pattern of bioerosion of the windward site of Zabargad was, however, very different from Zabargad-leeward and from Aqaba. The differences between the three sites can be attributed to the indirect effects of differing nutrient concentrations and hydrodynamic energy. Bioerosion rates of the experimental substrates at Aqaba were transferred to the reef surface. The lower fore-reef exhibited highest bioerosion rates. The carbonate budget calculated from gross carbonate production minus bioerosion is only slightly positive when averaged across the "Geomar-transect." The deeper zones, however, showed a negative balance. Net-erosion also occurred on a pinnacle to the north of the transect. Signs of erosion and damage can be seen throughout the reef. The results show that the carbonate balance is very vulnerable at Aqaba. Pollution is the main cause for reef degradation. The results from this study reemphasise the need for national and regional conservation measures to preserve this fragile ecosystem.
    Type: Thesis , NonPeerReviewed
    Format: text
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    OceanRep: Thesis - not published by a publisher
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