Metal transfer budgets in a Mediterranean marine environment subjected to natural and anthropogenic inputs: case of the Mejerda River Delta (Gulf of Tunis, northern Tunisia)

2019 ◽  
Vol 191 (6) ◽  
Author(s):  
Walid Oueslati ◽  
Mohamed Amine Helali ◽  
Noureddine Zaaboub ◽  
Ayed Added ◽  
Lotfi Aleya
Keyword(s):  
Marine Environment ◽  
Metal Transfer ◽  
River Delta ◽  
Northern Tunisia ◽  
Gulf Of Tunis ◽  
Anthropogenic Inputs

Safe Use of the Assimilative Capacity of the Marine Environment for Waste Disposal – Is It Feasible?

1986 ◽  
Vol 18 (4-5) ◽  
pp. 233-244 ◽  
Author(s):  
J. E. Portmann ◽  
R. Lloyd
Keyword(s):  
Marine Environment ◽  
Salt Marshes ◽  
Safety Margin ◽  
Assimilative Capacity ◽  
Anthropogenic Inputs ◽  
Upper Limit ◽  
Safe Limits ◽  
Control Authority ◽  
The Right ◽  
To Receive

For centuries the sea has absorbed a variety of inputs from rivers, streams, salt marshes and the atmosphere. It is generally accepted that additional limited inputs by man are unlikely to have a significant effect on the marine environment. Various control systems have been constructed to provide a framework within which the regulation of anthropogenic inputs can be achieved. These are briefly reviewed. With care, and in the light of past experience in both freshwater and marine environments, reasonable assumptions or estimations can be applied where uncertainties exist; safe limits can therefore be set for discharges. Case histories are used to illustrate the contention that it is possible to assess the assimilative capacity of a marine area to receive wastes. There is a major distinction to be drawn between contamination and pollution of the marine environment. Moreover, acknowledgement of the assimilative capacity concept in the marine environment does not automatically provide dischargers with the right to utilise that capacity either in part or to the upper limit. What it does is indicate the upper limit which must not be exceeded if pollution is to be avoided, and provide an indication to the control authority of the safety margin involved in the discharge limits they set accordingly.

scholarly journals Oxygen consumption and nutrient fluxes in coastal marine sediments off the Mejerda River delta (Gulf of Tunis)

2015 ◽  
Vol 16 (3) ◽  
pp. 636 ◽  
Author(s):  
M. A. HELALI ◽  
N. ZAABOUB ◽  
W. OUESLATI ◽  
A. ADDED ◽  
L. ALEYA
Keyword(s):  
Oxygen Consumption ◽  
General Scheme ◽  
Benthic Flux ◽  
River Delta ◽  
Diffusive Flux ◽  
Water Interface ◽  
Gulf Of Tunis ◽  
Coastal Marine ◽  
Benthic Chambers

The authors studied benthic flux of oxygen, alkalinity, and nutrients in situ at three points in the Mejerda River Delta at depths of 10m, 20m and 40m in March and August 2012. Three sedimentary cores were simultaneously drilled at the same locations to determine the diffusive flux of NO2-, NO3-, NH4+ and PO43- and to estimate diagenetic mechanisms occurring below the sediment-water interface. Photosynthesis was not sufficiently high during the day, and the oxygen consumption at sediment-water interface was about 1.7 to 10mmol/m²/day, essentially controlled by the degradation of organic matter and oxidation of reduced elements. Nitrate contents are relatively high in the sediment (above 140μM for NO3-)and their production is not always in conformity with the general scheme of early diagenesis, moreover, benthic flux between water and sediment are not clearly established. The diffusive flux of NH4+ and PO43- are always directed to the water column, at averages of 1.27μmol/m²/day for PO43- and 96.5μmol/m²/day for NH4+, complying with those measured by benthic chambers, but representing less than 30% of benthic fluxes for NH4+ and less than 5% for PO43-.

Diversity of the digenean fauna in sparid fishes from the Lagoon of Bizerte in Tunisia

2011 ◽  
Vol 56 (1) ◽  
Author(s):  
Lamia Gargouri Ben Abdallah ◽  
Rym Antar ◽  
Fadhila Maamouri
Keyword(s):  
Species Richness ◽  
Sparus Aurata ◽  
The Other ◽  
Bizerte Lagoon ◽  
Northern Tunisia ◽  
Mean Intensity ◽  
Digenean Species ◽  
Gulf Of Tunis ◽  
Sarpa Salpa ◽  
Lithognathus Mormyrus

AbstractA total of 24 digenean species belonging to 10 distinct families (Derogenidae, Faustulidae, Fellodistomidae, Gyliauchenidae, Hemiuridae, Lepocreadiidae, Mesometridae, Monorchiidae, Opecoelidae and Zoogonidae) were recorded in sparid fishes from Bizerte Lagoon (northern Tunisia). The diversity of the digenean fauna of sparid fishes from this locality is compared to that recorded from the Gulf of Tunis. Prodistomum polonii, not detected before, was found in Sarpa salpa. Aphallus rubalo, Derogenes latus, Holorchis micracanthum and Pachycreadium carnosum previously recorded from sparid fishes on the Tunisian coasts were absent during this study. Allopodocotyle pedicellata, Lepocreadium pegorchis, L. album, Proctoeces maculatus, Magnibursatus bartolii and Macvicaria maillardi were reported in hosts not previously reported for the Gulf of Tunis. Generally, prevalence was higher in fishes from Bizerte Lagoon but abundance and mean intensity were higher in Gulf of Tunis. Except for Lithognathus mormyrus, Sarpa salpa and Sparus aurata from Bizerte Lagoon, which show higher digenean diversity, the other sparid fishes have a lower diversity compared to those from Gulf of Tunis. The species richness of digeneans in B. boops was the same in the two areas studied.

scholarly journals Zooplankton from a North Western Mediterranean area as a model of metal transfer in a marine environment

2016 ◽  
Vol 66 ◽  
pp. 440-451 ◽  
Author(s):  
M. Battuello ◽  
P. Brizio ◽  
R. Mussat Sartor ◽  
N. Nurra ◽  
D. Pessani ◽  
...  
Keyword(s):  
Marine Environment ◽  
Mediterranean Area ◽  
Metal Transfer ◽  
Western Mediterranean ◽  
North Western

scholarly journals Use of otolith strontium : calcium ratio as an indicator of seasonal displacements of the silverside (Odontesthes bonariensis) in a freshwater–marine environment

2013 ◽  
Vol 64 (8) ◽  
pp. 746 ◽  
Author(s):  
E. Avigliano ◽  
A. V. Volpedo
Keyword(s):  
Marine Environment ◽  
Calibration Curve ◽  
Paraná River ◽  
River Delta ◽  
Water Bodies ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
La Plata ◽  
Parana River ◽  
Odontesthes Bonariensis

Strontium : calcium (Sr : Ca) ratios were measured in sagittal otoliths of silverside (Odontesthes bonariensis) from a freshwater–marine environment (Paraná River Delta and Río de la Plata River, South America) in order to understand its seasonal movements. Conductivity was recorded and the water Sr : Ca ratio was determined by inductively coupled plasma–atomic emission spectrometry (ICP-OES). A calibration curve of water Sr : Ca ratio versus otolith Sr : Ca ratio from four isolated lentic water bodies was made to predict silverside displacements in the lower section of the Plata Basin during summer (lotic water bodies). Otolith Sr : Ca ratio of silversides from the Paraná River Delta was associated with the conductivity of water at the locations where the sample was collected. According to this association and the obtained results in the calibration curve, the silversides were displaced from zones where conductivity was 7.45 (mS cm–1), corresponding to the water Sr : Ca ratio in the outer section of the Río de la Plata River (1.92 mmol mol–1). The high values of otolith Sr : Ca ratio found for some fish may indicate that during summer they moved from estuarine waters where salinity increases gradually to the Argentinian Sea.

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