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Population Dynamics and Secondary Production of Owenia fusiformis Delle Chiaje (Polychaeta Oweniidae) along the Coasts of Emilia-Romagna (Northern Adriatic, Mediterranean Sea)

  • E. Daelli
  • A. Occhipinti Ambrogi

Abstract

The population structure and dynamics of O. fusiformis have been studied for one annual cycle along the coasts of Emilia-Romagna (Italy). Five seasonal samplings were carried out along two transects differently influenced by the Po river outflow, at the depth of 3,8 and 12 m, using a 0.06 m2 Van Veen grab. Secondary production has been evaluated according to the increment weight method. Densities and biomass values were higher at 8 m depth in both the considered localities, probably due to lower mud content of the sediment. The pattern of size-frequency histograms suggests an estimated life-span of at least two years. The growth rate of the youngest individuals was higher at 3 m depth, due to the higher hydrodynamic levels of the shallower waters. Total annual production ranged from a minimum of 0.12 g m−2 y−1 at the depth of 12 m off Cesenatico, to a maximum of 14.78 g m−2 y−1 at the depth of 3 m off Porto Garibaldi.

Keywords

Fine Sand Total Abundance Abdominal Segment Secondary Production Sediment Texture 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Italia 2001

Authors and Affiliations

  • E. Daelli
    • 1
  • A. Occhipinti Ambrogi
    • 1
  1. 1.Dipartimento di Genetica e Microbiologia, Sezione EcologiaUniversità di PaviaPaviaItaly

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