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Kill of benthic organisms as a response to an anoxic state in the northern Adriatic Sea (a critical review)
Simunovic, A.; Piccinetti, C.; Zore-Armanda, M. (1999). Kill of benthic organisms as a response to an anoxic state in the northern Adriatic Sea (a critical review). Acta Adriat. 40(1): 37-64
In: Acta Adriatica. Institute of Oceanography and Fisheries: Split. ISSN 0001-5113; e-ISSN 1846-0453, more
Peer reviewed article  

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Keywords
    Depletion > Oxygen depletion > Anoxia
    Diseases > Human diseases > Hypoxia
    Residual circulation
    Sediments
    Trawls
    Marine/Coastal
Author keywords
    Northern Adriatica; kill of organisms; structural changes; recovery of organisms

Authors  Top | Dataset 
  • Simunovic, A.
  • Piccinetti, C.
  • Zore-Armanda, M.

Abstract
    Hypoxic and anoxic states, occurring temporarily, count among the problems of the northern Adriatic Sea. In the course of the long-term studies of the continental shelf (PIPETA programme) of the Adriatic Sea, a drastic deficiency of oxygen concentrations in the bottom layer of the offshore part of the northern Adriatic was recorded in October 1988. Material for this paper was collected during PIPETA cruises (RV, 300 HP). It included hydrographic and biological data (obtained by trawl and grab). The first signs of newly dead individuals of benthic organisms were recorded at oxygen concentration as low as 1 ml l-1. At stations where the total quantity of dissolved oxygen exceeded 1 ml l-1 no signs of dead organisms were found. Fish and cephalopods accumulated in well aerated area. In 1988 a kill of organisms was recorded within current eddies on the sea bottom rich in organic matter (muddy component). Varying rhythm of sedimentation in the northern Adriatic is affected by the Po River water regime and the velocity of general Adriatic current. Results obtained by grab are illustrative of the varying distribution of animal groups on a "mosaic-like" distributed sediment in a very small area. Biological data obtained for different oxygen concentrations at different profiles and stations in 1988, were compared to the biological data from 1987 and 1991.

Dataset
  • National Institute of Oceanography and Experimental Geophysics (OGS), Italian National Institute for Environmental Protection and Research (ISPRA), Italy; (2017): Trawl-survey data from the Pipeta programme in the Northern Adriatic Sea (Mediterranean) collected in 1988 and 1991, more

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