Stress response to trace elements mixture of different embryo-larval stages of Paracentrotus lividus

peer reviewedThis study investigated for the first time the oxidative biomarkers responses in all larval stages of sea urchin. The contamination effects were reproduced by using contaminated seawater to concentrations measured in the area adjacent to an old asbestos mine at factors of 5 and 10. The results suggested that the concentrations were not sufficiently high to induce a major oxidative stress. The biometric differences make this method a more sensitive approach for assessing the effects on sea urchin larvae. Measurements of specific activities of antioxidant enzymes at each stage suggested a high capacity of the larvae to respond to oxidative stress. This normal activity of the organism must be considered in future research. This work also highlighted the importance of spawners provenance in ecotoxicological studies. These data are essential to better understand the stress responses of sea urchin larvae and provide baseline information for later environmental assessment research

Assessment of trace element contamination and effects on Paracentrotus lividus using several approaches: Pollution indices, accumulation factors and biochemical tools.

peer reviewedAmong the most common contaminants in marine ecosystems, trace elements are recognized as serious pollutants. In Corsica (NW Mediterranean Sea), near the old asbestos mine at Canari, trace elements from the leaching of mine residues have been discharged into the sea for several decades. The aim of this study was to assess the levels of contamination in this area and the potential effects on Paracentrotus lividus (Lamarck, 1816) using pollution indices, accumulation factors and biochemical tools. For this purpose, the concentration of 24 trace elements was measured in sea urchins (gonads and gut content), macroalgae, seawater column and sediment collected at 12 stations nearby the old asbestos mine and at a reference site. The bioaccumulation of trace elements occurs as follows: macroalgae > gut > gonads. TEPI contribute to highlight contamination gradients which are mainly due to the dominant marine currents allowing the migration of mining waste along the coastline. This hypothesis was supported by TESVI, which identified characteristic trace elements in the southern area of the mine. High hydrogen peroxide content, associated with elevated catalase and glutathione-S-transferase enzyme activities, were also identified at these sites and at the reference site. Trace elements contamination as well as several abiotic factors could explain these results (e.g. microbiological contamination, hydrodynamic events, etc.). The results obtained in this study suggest that oxidative stress induced by contamination does not affect the health of Paracentrotus lividus. This work has provided a useful dataset allowing better use of sea urchins and various tools for assessing trace element contamination in coastal ecosystems.STARECAPMED project (STAtion of Reference and rEsearch on Change of local and global Anthropogenic Pressures on Mediterranean Ecosystems Drifts

Redescription of Caligus pagelli Delamare Deboutteville & Nuñes-Ruivo, 1958 (Copepoda: Caligidae) on the common pandora, Pagellus erythrinus (Linnaeus), in western Mediterranean waters off Corsica, France

PubMedID: 29808452Caligus pagelli Delamare Deboutteville & Nuñes-Ruivo, 1958, a rare and poorly known sea louse, is redescribed based on newly collected specimens of both sexes. The new material was collected from the common pandora Pagellus erythrinus (Linnaeus) caught in western Mediterranean waters off Corsica. The original and only available description of C. pagelli was incomplete and based only on females. Here we redescribe the female in detail, and describe the male for the first time. © 2018, Springer Science+Business Media B.V., part of Springer Nature

Transfert de Microcotyle pancerii (Monogenea, Microcotylidae) parasite naturel du téléostéen Umbrina cirrosa (Scianidae) chez Argyrosomus regius (Scianidae) dans des élevages marins de Corse

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Spatial variations in trace element concentrations of the sea urchin, Paracentrotus lividus, a first reference study in the Mediterranean Sea

A study on Trace Elements (TE) from sea urchin gonads has been conducted in the western Mediterranean Sea. Contamination data were used to determine a Trace Method Pollution Index (TEPI). TE concentrations varied considerably depending on the location of the sampling stations. The results showed that five trace elements (Zn, Fe, As, Al, Cu) are ubiquitous. The geographical area considered (Corsica) represents an important range of environmental conditions and types of pressure that can be found in the western Mediterranean Sea. TEPI was used to classify the studied sites according to their degree of contamination and allowed reliable comparison of TE contamination between local and international sites. TE contamination of the western Mediterranean Seadisplayed a north-to-south gradient, from the Italian coasts down through the insular Corsican coasts to the north African littoral. Due to the increasing environmental pressure on the Mediterranean Sea, a regular monitoring of TE levels in marine organisms is necessary to prevent any further environmental deterioration

Caractérisation des communautés de parasites de poissons de la réserve naturelle des Bouches de Bonifacio

CORTE-BU (200962101) / SudocSudocFranceF

Spatio-temporal patterns based on demographic and genetic diversity of the purple sea urchin Paracentrotus lividus in the area around Corsica (Mediterranean Sea)

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Influence of site and host on parasites of two teleost fish in Algeria revealed by using indicator species analysis

International audienceThe indicator value methods are important to conservation biology because it is conceptually straight forward and allows researchers to identify bioindicators for any combination for habitat types or areas of interest. (Mc Geoch & Chown, 1998). The spatial distribution of parasitic copepods from teleost fishes (Chelon labrosus, Mugil cephalus, Liza aurata and Dicentrarchus labrax) was studied in two sites (Annaba gulf and El Mellah lagoon) in the eastern Algeria coastline using indicator species analysis (Indval) to identify parasite species as bioindicators of a given ecosystem during 2005-2008, also identified parasites as bioindicators relative to host. The randomization test identified four parasite species (Caligus mugilis, Ergasilus liza, Lernanthropus mugilis, Caligus minimus) having a significant indicator value for the site and six indicators for the host (Caligus mugilis, Ergasilus bora, Lernanthropus kroyeri, Lernanthropus mugilis, Caligus minimus, Ergasilus liza). Data on species composition and infection levels would help improve the monitoring and management of parasitism in Mugilidae and Moronidae populations. However none pointed out the role of parasitic copepods as bioindicators in Algerian costs

Spécificité des parasites monogènes et phylogénie de leur hôtes dans l’est du littoral algérien

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