Drivers of anoxia in a eutrophic lagoon with clams farming (Sacca di Goro Lagoon, Italy): risk evaluation via multivariate statistics and timescales analysis.

The anoxia risk in a shallow coastal lagoon (Sacca di Goro (SG), Italy) experiencing multiple pressures (clam aquaculture, anthropogenic nutrient inputs, climate change) was assessed by combining timescales of anoxia onset, benthic nutrient turnover, horizontal and vertical transport, multivariate statistics, and Geographic Information System (GIS). The biogeochemical and transport timescales were obtained by experimental measurements and physical modeling. To this purpose, daily oxygen (O) and nutrient fluxes [dissolved inorganic phosphorus (DIP), ammonium (NH), dissolved reactive silica (SiO)] were measured in the benthic and pelagic compartments at six areas of the lagoon catching its complex spatial heterogeneity due to riverine and marine inputs, clams farming, depths, flushing and vertical exchange times, amount and quality of organic matter.

Temporal and spatial differences in nitrogen and phosphorus biogeochemistry and ecosystem functioning of a hypertrophic lagoon (Curonian Lagoon, SE Baltic Sea) revealed via Ecological Network Analysis.

In coastal lagoons, eutrophication and hydrology are interacting factors that produce distortions in biogeochemical nitrogen (N) and phosphorus (P) cycles. Such distortions affect nutrient relative availability and produce cascade consequences on primary producer's community and ecosystem functioning. In this study, the seasonal functioning of a coastal lagoon was investigated with a multielement approach, via the construction and analysis of network models.

The effects of hydrological extremes on denitrification, dissimilatory nitrate reduction to ammonium (DNRA) and mineralization in a coastal lagoon.

Hydrological extremes of unusually high or low river discharge may deeply affect the biogeochemistry of coastal lagoons, but the effects are poorly explored. In this study, microbial nitrogen processes were analyzed through intact core incubations and N-isotope addition at three sites in the eutrophic Sacca di Goro lagoon (Northern Adriatic Sea) both under high discharge (spring) and after prolonged low discharge (late-summer) of the main freshwater inputs. Under high discharge/nitrate load, denitrification was the leading process and there was no internal recycling.