Response to oxygen deficiency (depletion): Bivalve assemblages as an indicator of ecosystem instability in the northern Adriatic Sea |
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Authors: | Vedrana Nerlovi? Alper Do?an and Mirjana Hrs-Brenko |
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Institution: | (1) Dipartimento di Biologia Evoluzionistica Sperimentale And Centro Interdipartimentale di Ricerca per le Scienze Ambientali, Universit? di Bologna, Via S. Alberto 163, 48100 Ravenna, Italy |
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Abstract: | Benthic communities represent a powerful tool for the detection of natural and anthropogenic disturbances, as well as for
the assessment of marine ecosystem stability. This paper shows that bivalve assemblages could serve as excellent indicators
of disturbance and ecosystem instability. The goal of this study was to compare two sets of data in order to determine the
differences between two different periods belonging to bivalve assemblage in the muddy detritic bottom of the northern Adriatic
Sea in the post-anoxic period during December 1989, 1990, 1991 and quite a while later, during 2003, 2004 and 2005. Abundances
of some indicator species such as Corbula gibba, Modiolarca subpicta and Timoclea ovata were detected during the post-anoxic period. Recruitment in the quality of bivalve assemblages was proved by the ecologic
and biotic indexes during 2003, 2004 and 2005, during a period of relatively stable ecological conditions. Fluctuation in
bivalve diversity due to the ecological quality of the marine ecosystem in the eastern part of the northern Adriatic Sea is
also discussed. |
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Keywords: | |
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