scholarly journals Harmful Algae Records in Venice Lagoon and in Po River Delta (Northern Adriatic Sea, Italy)

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Chiara Facca ◽  
Dagmar Bilaničovà ◽  
Giulio Pojana ◽  
Adriano Sfriso ◽  
Antonio Marcomini
Keyword(s):  
Algal Blooms ◽  
Adriatic Sea ◽  
Venice Lagoon ◽  
River Delta ◽  
Future Research ◽  
Northern Adriatic Sea ◽  
Po River ◽  
Northern Adriatic ◽  
Cell Abundance ◽  
Tof Ms

A detailed review of harmful algal blooms (HAB) in northern Adriatic Sea lagoons (Po River Delta and Venice lagoon) is presented to provide “updated reference conditions” for future research and monitoring activities. In the study areas, the high mollusc production requires the necessity to identify better methods able to prevent risks for human health and socioeconomical interests. So, an integrated approach for the identification and quantification of algal toxins is presented by combining microscopy techniques with Liquid Chromatography coupled with High Resolution Time of Flight Mass Spectrometry (HPLC-HR-TOF-MS). The method efficiency was first tested on some samples from the mentioned coastal areas, whereDinophysisspp. occurred during summer in the sites directly affected by seawaters. Although cell abundance was always <200 cells/L, the presence of Pectenotoxin-2 (PTX2), detected by HPLC-HR-TOF-MS, indicated the potential release of detectable amounts of toxins even at low cell abundance.

scholarly journals Seasonal and Interannual Trends of Oceanographic Parameters over 40 Years in the Northern Adriatic Sea in Relation to Nutrient Loadings Using the EMODnet Chemistry Data Portal

Water ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 2280 ◽  
Author(s):  
Federica Grilli ◽  
Stefano Accoroni ◽  
Francesco Acri ◽  
Fabrizio Bernardi Aubry ◽  
Caterina Bergami ◽  
...  
Keyword(s):  
Climate Changes ◽  
Management Practices ◽  
Adriatic Sea ◽  
Nutrient Concentrations ◽  
Data Series ◽  
Mean Flow ◽  
Northern Adriatic Sea ◽  
Po River ◽  
Northern Adriatic

Long-term data series (1971–2015) of physical and biogeochemical parameters were analyzed in order to assess trends and variability of oceanographic conditions in the northern Adriatic Sea (NAS), a mid-latitude shallow continental shelf strongly impacted by river discharges, human activities and climate changes. Interpolation maps and statistical models were applied to investigate seasonal and spatial variability, as well as decadal trends of temperature, salinity, chlorophyll-a and nutrients. This analysis shows that sea surface temperature increased by +0.36% year−1 over four decades. Annual mean flow of the Po River markedly changed due to the occurrence of periods of persistent drought, whereas the frequency of flow rates higher than 3000 m3 s−1 decreased between 2006 and 2015. Moreover, we observed a long-term decrease in surface phosphate concentrations in Po River water (−1.34% year−1) and in seawater (in summer −2.56% year−1) coupled, however, to a significant increase in nitrate concentration in seawater (+3.80% year−1) in almost all seasons. These changes indicate that the nutrient concentrations in the NAS have been largely modulated, in the last forty years, by the evolution of environmental management practices and of the runoff. This implies that further alteration of the marine environment must be expected as a consequence of the climate changes.

scholarly journals Variability of currents in front of the Venice Lagoon, Northern Adriatic Sea

2008 ◽  
Vol 26 (4) ◽  
pp. 731-746 ◽  
Author(s):  
S. Cosoli ◽  
M. Gačić ◽  
A. Mazzoldi
Keyword(s):  
Water Column ◽  
Wind Stress ◽  
Time Scale ◽  
Adriatic Sea ◽  
Sea Breeze ◽  
Venice Lagoon ◽  
Northern Adriatic Sea ◽  
Northern Adriatic ◽  
Modes Of Variability ◽  
Tidal Signal

Abstract. Time scales and modes of variability of the flow in the water column in the Northern Adriatic Sea for late summer 2002 are described based on current record from a single bottom-mounted ADCP in the shallow-water area in front of the Venice Lagoon. The time averaged flow was directed 277° E (CCW), roughly aligned with the coastline, with typical magnitudes in the range 4–6 cm/s and a limited, not significant clockwise veering with depth. Tidal forcing was weak and mainly concentrated in the semidiurnal frequency band, with a barotropic (depth-independent) structure. On a diurnal time scale, tidal signal was biased by the sea-breeze regime and was characterized by a clockwise veering with depth according to the Ekman spiral. A complex EOF analysis on the velocity profile time series extracted two dominant spatial modes of variability, which explained more than 90% of the total variance in the current field. More than 78% of the total variance was accounted for by the first EOF mode, with a barotropic structure that contained the low-frequency components and the barotropic tidal signal at semidiurnal and diurnal frequencies. The second mode had a baroclinic structure with a zero-crossing at mid-depth, which was related with the response of the water column to the high-frequency wind-driven diurnal sea breeze variability. The response of low-passed non-tidal currents to local wind stress was fast and immediate, with negligible temporal lag up to mid-depth. Currents vectors were pointing to the right of wind stress, as expected from the surface Ekman veering, but with angles smaller than the expected ones. A time lag in the range 10 to 11 h was found below 8 m depth, with current vectors pointing to the left of wind stress and a counterclockwise veering towards the bottom. The delay was consistent with the frictional adjustment time scale describing the dynamics of a frictionally dominated flow in shallow water, thus suggesting the importance of bottom friction on the motion over the entire water column.

Prediction of Sporadic Mucilaginous Algal Blooms in the Northern Adriatic Sea

1999 ◽  
Vol 38 (10) ◽  
pp. 891-898 ◽  
Author(s):  
Daniel C.O Thornton ◽  
David Santillo ◽  
Brenda Thake
Keyword(s):  
Algal Blooms ◽  
Adriatic Sea ◽  
Northern Adriatic Sea ◽  
Northern Adriatic

scholarly journals The infaunal community in experimentally seeded low and high density Manila clam (Tapes philippinarum) beds in a Po River Delta lagoon (Italy)

2006 ◽  
Vol 63 (5) ◽  
pp. 860-866 ◽  
Author(s):  
S. Mantovani ◽  
G. Castaldelli ◽  
R. Rossi ◽  
E.A. Fano
Keyword(s):  
Subsequent Development ◽  
River Delta ◽  
Manila Clam ◽  
Macrobenthic Community ◽  
In Situ Experiment ◽  
Northern Adriatic Sea ◽  
Tapes Philippinarum ◽  
Po River ◽  
Northern Adriatic ◽  
Infaunal Community

Abstract The Sacca di Goro is a shallow, brackish, eutrophic coastal lagoon in the southernmost part of the Po River Delta (northern Adriatic Sea, Italy). It is heavily exploited for rearing the Manila clam (Tapes philippinarum), mean annual production since 1986 being 10 000 t. Commercial cultivation of bivalves can exert severe impact on a local environment, especially on the invertebrate community, reducing species richness and abundance. An in situ experiment was conducted from March 2003 to February 2004 to examine the effect of clam cultivation on the macrobenthic community. Replicated sites within an area licensed for clam farming were seeded with low (500 m−2) and high (1500 m−2) clam densities; the surrounding unseeded areas were used as a control. There were only weak effects of clam presence and density on macrobenthic community abundance and functional group composition. The main determinants regulating the macrobenthic community were seasonal variations in other biota, particularly proliferation of the invasive mussel, Musculista senhousia, in August, which in turn caused a significant increase in the biomass of surface deposit-feeders and the subsequent development of Ulva rigida beds in September.

scholarly journals Macrophytes: A Temporary Sink for Microplastics in Transitional Water Systems

Water ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3032
Author(s):  
Andrea Augusto Sfriso ◽  
Yari Tomio ◽  
Abdul-Salam Juhmani ◽  
Adriano Sfriso ◽  
Cristina Munari ◽  
...  
Keyword(s):  
Adriatic Sea ◽  
Venice Lagoon ◽  
Water Systems ◽  
Specific Pattern ◽  
Fresh Weight ◽  
Northern Adriatic Sea ◽  
Northern Adriatic ◽  
Marine Macrophytes ◽  
Species Specific ◽  
A Site

Marine macrophytes are hypothesized to be a major temporary sink for microplastics. In this study, microplastic contamination was investigated in 15 macroalgal species and one seagrass from different sites in two lagoons of the northern Adriatic Sea: the Goro lagoon and the Venice lagoon. A high percentage (94%) of the macrophyte samples contained microplastics, ranging from 0.16 to 330 items g−1 fw, with the prevalent size in the range 30–90 µm and an average contamination per unit of fresh weight of 14 items g−1 fw. Microplastic contamination displayed a site-specific, rather than a species-specific, pattern of accumulation. In addition, exopolysaccharides (EPS) displayed a significant positive correlation with the microplastics ononcontamination on macrophytes acting as glue for the plastic particles available in the water column.

Increased ammonium levels occurring during benthic algal blooms are potentially toxic to fucalean algae

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ljiljana Iveša ◽  
Tamara Djakovac ◽  
Andrea Bilajac ◽  
Edi Gljušćić ◽  
Massimo Devescovi
Keyword(s):  
Climate Change ◽  
Algal Blooms ◽  
Adriatic Sea ◽  
Northern Adriatic Sea ◽  
The West ◽  
Northern Adriatic ◽  
Complete Necrosis ◽  
Laboratory Conditions ◽  
Cystoseira Compressa

Abstract During the spring of 2016, benthic blooms of Acinetospora crinita (Ectocarpales, Phaeophyceae) producing voluminous mucilaginous aggregates frequently occurred at surveyed locations of the west Istrian Coast (northern Adriatic Sea, Croatia). In mucilage-affected macroalgal assemblages, the concentration of ammonium ranged from 50 to 300 μM. To investigate whether ammonium has the potential to harm fucalean species, a selected taxon, Cystoseira compressa was exposed to increased ammonium concentrations in laboratory conditions. Experiments revealed that exposure to 50 μM ammonium severely damaged the thalli while exposure to 300 μM caused complete necrosis of thalli in 2 days. These findings suggest that benthic algal blooms, enhanced by climate change and eutrophication, can negatively affect the populations of fucalean species due to production of ammonium during the decay of mucilaginous aggregates, causing thallus necrosis.

Sign in / Sign up

Export Citation Format

Share Document