Jonathan Richir

University of Liège

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Sylvie Gobert

University of Liège

Pierre Lejeune

University of Liège

Gilles Lepoint

University of Liège

Alberto Borges

University of Liège

Gordon Watson

University of Portsmouth

Willy Champenois

University of Liège

Arnaud Abadie

University of Liège

Philippe Grosjean

University of Mons

Jennifer Pini

University of Portsmouth

Michèle Leduc

École Navale

Cooperative Institutions

University of Liège

Centre National de la Recherche Scientifique

University of Aveiro

University of Girona

Universitat de Barcelona

Norwegian University of Science and Technology

Ifremer

Université de Corse Pascal Paoli

Institut de Recherche pour le Développement

Observatoire Océanologique de Banyuls-sur-Mer

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Assessment of physico-chemical parameters of freshwater in the Sidi Abderrahmane reservoir, Safi, Morocco

African Journal of Aquatic Science (2020)

Wafae Belokda Zainab Damsiri Laila Natij Karima Khalil M. Loudiki

The purpose of the study was to assess the water quality in the Sidi Abderrahmane freshwater reservoir (Safi, Morocco). The monitoring data used in the study included physical, chemical, and biological characteristics. The spatial and temporal characteristics of these parameters was evaluated by collecting water samples fortnightly from May 2011 to December 2012 in three stations chosen to represent different parts of the reservoir. Ten parameters considered as indicators of water properties were analysed: temperature, dissolved oxygen, pH, electric conductivity, transparency, orthophosphorus, ammonium, nitrites, nitrates, and chlorophyll a. The results show that nutrient concentrations were among the highest (mean concentrations: PO 3− = 0.64 mg l−1, NH4+ = 1.08 mg l−1) recorded for Moroccan freshwater reservoirs. Our data indicated that the Sidi Abderrahmane is a destratified reservoir that it is relatively warm (mean temperature: 22.42 ± 4.88 °C); a polymictic reservoir in a semi-arid climate. Fertilisers applied in the surrounding orchards affect significantly affect nutrient levels in the waterbody, particularly PO 3− and NH4+ in autumn. The water column is seasonally homogeneous, as a result of wind-induced mixing, and our tests showed no anoxia throughout the study period. With suitable hydraulic conditions (short residence time, short outflow/inflow ratio, good oxygenation, and homogeneity), the Sidi Abderrahmane water body could reduce the stratification time and improve water quality.

Outflow

10.2989/16085914.2019.1692777

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The influence of bioavailable copper and zinc concentrations on metallothionein levels, DNA damage and gene expression in the polychaete Nereis (Alitta) virens (M. Sars, 1835)

Jennifer Pini Jonathan Richir Gordon Watson

Metallothionein

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Investigating the potential of Cymodocea nodosa (Ucria) Ascherson as a coastal carbon sink coupling marine habitat cartographies and in situ nondestructive sampling

Arnaud Abadie Jonathan Richir Riccardo Pieraccini Branko Velimirov Michèle Leduc

Sink (geography)

Carbon sink

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Exploring a Mediterranean mesozooplankton 13 year time-series.

Lovina Fullgrabe Jonathan Richir Antoine Batigny Michèle Leduc Patrick Dauby

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Assessing edge-effects in Posidonia oceanica seagrass meadows: A multidisciplinary approach

Jon Lapeyra Arnaud Abadie Pierre Lejeune Nicolas Sturaro Loïc Michel

Posidonia oceanica

Potamogetonaceae

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The Strange Case of Tough White Seabream (Diplodus sargus, Teleostei: Sparidae): A First Approach to the Extent of the Phenomenon in the Mediterranean

Frontiers in Marine Science (2020)

Margarida Casadevall Conxi Rodríguez‐Prieto Josep Pueyo‐Ros Carolina Martí Roberto Merciai

A worrying phenomenon has been affecting the common white seabream (Diplodus sargus) for near 40 years. Professional and recreational fishers from the Mediterranean coasts and the Atlantic coasts of Europe and Macaronesia have reported individuals of white seabream that became "like a tire" after cooking, and consequently inedible. The phenomenon was related neither to the freshness of the fish nor to the way it had been preserved or cooked. According to recreational fishers, this abnormally tough specimens (ATS) phenomenon appeared singularly in time, in different places and to different extents. This singular, scattered appearance, with no area of origin from which to spread, de facto excluded any process of contagion. In order to compensate for the lack of knowledge and understanding related to this issue, we undertook a first study aimed at addressing the extent of the white seabream anomaly in the western Mediterranean. To reach this objective, we carried out surveys on voluntary basis among fishers (both professional and recreational) and researchers throughout the western Mediterranean. Data from the surveys (n = 270) were then analysed to evaluate the distribution of ATS and its possible relationship with human activities. Results showed that the anomaly affected the white seabream and very occasionally some other species, mainly of the same family Sparidae. In addition, the phenomenon did not occur simultaneously in the different areas surveyed over the last years and in some places it seems to have disappeared. We highlighted a possible link between ATS occurrence and the presence of human activities in adjacent areas. We hypothesized pollution - including copper - could be a possible driver of ATS. Results suggest a tendency of ATS to cluster around fish farms and commercial and industrial ports, although we are aware other human factors might also influence the phenomenon. To conclude, the present study gives an overview of the importance of the white seabream anomaly in the Mediterranean and encourages further research to disentangle the exact mechanisms behind this phenomenon.

Diplodus

Sparidae

Teleostei

Phenomenon

White (mutation)

10.3389/fmars.2020.00387

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Contamination par les éléments traces en Méditerranée occidentale, focus sur la baie de Calvi et la Corse. Bilan et perspectives.

Sylvie Gobert Eric Durieux Ouafa El Idrissi Laurence Lefèbvre Pierre Lejeune

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Suivi de la bioaccumulation de métaux traces dans la moule Mytilus galloprovincialis dans la région ouest algérienne

Yamina Leila Rouabhi Philippe Grosjean Omar Rouane Hassene Jonathan Richir

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Atlas - Channel Catchment Cluster

L.K. Morris Nick Pope Jonathan Richir Jennifer Pini Shannon L. White

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Combined utilization of DGTs and bioindicators to trace chemical contamination threats on coastal ecosystems

Jonathan Richir Nicolas Luy Pierre Serpe lucie lefebvre Alexandre Deraikem

Trace metal monitoring in marine organisms and their living habitats permit to trace chronic or acute contaminations of marine ecosystems due to human activities. While dissolved trace metal concentrations give us an overall and punctual view over biota contamination status, bioindicator species put their bioavailable and possible toxic fraction in an obvious. However, difficulties mainly inherent to metal measurements in seawater lead field ecotoxicologists to study marine pollution essentially through the use of bioindicators alone. The technique of diffusive gradients in thin films (DGT) for the measurement of trace metals in aqueous solutions was introduced in the mid-ninetieth by Davison and Zhang. This passive probe accumulates labile trace metal species in proportion to their bulk environmental concentrations by maintaining a negative gradient between the environment and an ionexchange resin (Chelex). DGTs average natural water trace metal concentrations over the deployment period, concentrate them and avoid matrix interferences, notably due to dissolved salts in seawater. Their deployment in passive and experimental monitoring studies permits to reliably measure labile trace metal concentrations and, jointly analysed with bioindicators, to estimate their bioavailability to marine organisms.

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Trace metal

Biota

Marine ecosystem

Trace element

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Citations (1)