Evolution of the Trophic Conditions and Dystrophic Outbreaks in the Sacca di Goro Lagoon (Northern Adriatic Sea)

Dystrophy and vulnerability have been analysed in the Sacca di Goro lagoon (Po river Delta, Italy), where long term research was started in 1989 with respect to the abnormal growth and decomposition of the seaweed Ulva rigida.The research addresses: (1) trends in hydrochemical variables; (2) biomass, growth rates and the elemental composition of the dominant macroalgae; (3) nutrient uptake and retention within the macroalgal biomass; (4) oxygen metabolism; (5) decomposition processes and their effects on benthic fluxes of nitrogen, phosphorus and sulphide; (6) iron buffering of the phosphorus and sulphur cycles.

[1]  J. Roelofs,et al.  Prevention of sulphide accumulation and phosphate mobilization by the addition of iron(II) chloride to a reduced sediment: an enclosure experiment , 1995 .

[2]  S. V. Smith,et al.  C:N:P ratios of benthic marine plants1 , 1983 .

[3]  J. Hauxwell,et al.  Macroalgal blooms in shallow estuaries: Controls and ecophysiological and ecosystem consequences , 1997 .

[4]  B. Jørgensen,et al.  Measurement of bacterial sulfate reduction in sediments: Evaluation of a single-step chromium reduction method , 1989 .

[5]  K. Ruttenberg.  Development of a sequential extraction method for different forms of phosphorus in marine sediments , 1992 .

[6]  K. Sand‐Jensen,et al.  Interactions among phytoplankton, periphyton, and macrophytes in temperate freshwaters and estuaries , 1991 .

[7]  P. Viaroli,et al.  Benthic Fluxes of Oxygen, Ammonium and Nitrate and Coupled-uncoupled Denitrification Rates within Communities of Three Different Primary Producer Growth Forms , 2001 .

[8]  Tom Pearson,et al.  Marine eutrophication and population dynamics: Proceedings of 25th European Marine Biology Symposium, edited by G. Colombo, I. Ferrari, V. U. Ceccherelli & R. Rossi; Olsen & Olsen, Fredensborg; 1992; 393 pp; price £ 92.00; ISBN 87-85215-19-8 , 1993 .

[9]  R. Fujita,et al.  Assessment of macroalgal nitrogen limitation in a seasonal upwelling region , 1989 .

[10]  R. Christian,et al.  The role of macroalgae and detritus in the nutrient cycles in a shallow-water dystrophic lagoon , 1993 .

[11]  P. Viaroli,et al.  Sulphide release from anoxic sediments in relation to iron availability and organic matter recalcitrance and its effects on inorganic phosphorus recycling , 1996, Hydrobiologia.

[12]  D. Lovley,et al.  Rapid Assay for Microbially Reducible Ferric Iron in Aquatic Sediments , 1987, Applied and environmental microbiology.

[13]  M. Pedersen,et al.  Nutrient control of estuarine macroalgae: growth strategy and the balance between nitrogen requirements and uptake , 1997 .

[14]  B. Lapointe.  Nutrient thresholds for bottom‐up control of macroalgal blooms on coral reefs in Jamaica and southeast Florida , 1997 .

[15]  P. Lavery,et al.  Changes in the biomass and species composition of macroalgae in a eutrophic estuary , 1991 .

[16]  Piet H. Nienhuis,et al.  Marine benthic vegetation : recent changes and the effects of eutrophication , 1997 .

[17]  P. Viaroli,et al.  Seasonal variations of sulphate reduction rates sulphur pools and iron availability in the sediment of a dystrophic lagoon (Sacca di Goro, Italy) , 1997 .

[18]  C. D’Elia,et al.  NUTRITIONAL STUDIES OF TWO RED ALGAE. I. GROWT RATE AS A FUNCTION OF NITROGEN SOURCE AND CONCENTRATION 1 , 1978 .

[19]  Joel D. Cline,et al.  SPECTROPHOTOMETRIC DETERMINATION OF HYDROGEN SULFIDE IN NATURAL WATERS1 , 1969 .

[20]  J. A. Hellebust,et al.  Physiological and biochemical methods , 1978 .