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Natural oligotrophy vs. pollution-induced eutrophy on the SE Mediterranean shallow shelf (Israel): Environmental parameters and benthic foraminifera
Hyams-Kaphzan, O.; Almogi-Labin, A.; Benjamin, C.; Herut, B. (2009). Natural oligotrophy vs. pollution-induced eutrophy on the SE Mediterranean shallow shelf (Israel): Environmental parameters and benthic foraminifera. Mar. Pollut. Bull. 58(12): 1888-1902
In: Marine Pollution Bulletin. Macmillan: London. ISSN 0025-326X, more
Peer reviewed article  

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Keywords
    Activated sludge; Eutrophication; Inorganic carbon; Nutrient loads; Sludge; Ammonia tepida (Cushman, 1926) [WoRMS]; Foraminifera [WoRMS]; MED, Eastern Mediterranean [Marine Regions]; MED, Israel [Marine Regions]; Marine

Authors  Top 
  • Hyams-Kaphzan, O.
  • Almogi-Labin, A.
  • Benjamin, C.
  • Herut, B.

Abstract
    The eastern Mediterranean is naturally highly oligotrophic, but urbanization along the Levant coast has led to raised organic and nutrient loads. This study tracks living foraminiferal assemblages at two sites near an activated sewage sludge outfall from 11/2003 to 5/2004. Oligotrophic site PL29 shows seasonal variations in O2, chlorophyll a, and organic carbon, and has an abundant, diverse benthic foraminiferal assemblage living at various in-sediment depths. At eutrophic site PL3, not, vert, similar16 years of sludge injection favor a depleted assemblage primarily of opportunist foraminifera. This site shows less seasonality, is subjected to organic matter overload, O2-stress, and periodic anoxia, foraminifera are less abundant and diverse, and live at shallower depths. The assemblages at both sites represent a common pool of species, with Ammonia tepida highly dominant. Benthic foraminifera were therefore found to be sensitive to trophic trajectories, respond on sub-seasonal time-scales, and track injection and dispersal of organic loads on the shelf.

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