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M Anouk Goedknegt, David W Thieltges, Jaap van der Meer, K Mathias Wegner, Pieternella C Luttikhuizen
Despite their frequent occurrence and strong impacts on native biota, biological invasions can long remain undetected. One reason for this is that an invasive species can be morphologically similar to either native species or introduced species previously established in the same region, and thus be subject to mistaken identification. One recent case involves congeneric invasive parasites, copepods that now infect bivalve hosts along European Atlantic coasts, after having been introduced independently first from the Mediterranean Sea (Mytilicola intestinalis Steuer, 1902) and later from Japan (Mytilicola orientalis Mori, 1935)...
2018: PloS One
G Capillo, S Silvestro, M Sanfilippo, E Fiorino, G Giangrosso, V Ferrantelli, I Vazzana, C Faggio
Faro Lake is a coastal meromictic lagoon with singular characteristics in the Mediterranean (Messina, Sicily - Italy). It is part of the Natural Oriented Reserve of Capo Peloro (38°15'57" N; 15° 37'50" E). In this area, traditional mollusc farming activity persists, producing "autochthonous" mussels. This study reports of the Mytilus galloprovincialis haemolymph chemical profile and water variables determination of one year-lasted survey (April 2016-March 2017). The determinations of electrolytes (Na+, Cl-, K+, Ca2+, Mg2+, P inorganic) and heavy metals in both Faro lake water and haemolymph have been carried out...
March 9, 2018: Chemistry & Biodiversity
Andrew Barrick, Catherine Guillet, Catherine Mouneyrac, Amélie Châtel
Anthropogenic influences on the environment have been become a focal point for many social and political endeavors. With an ever-increasing rate of new contaminants being introduced into the environment every year, regulatory policies have begun to shift to prevention rather than mitigation. However, current in vivo testing strategies, in addition to ethical considerations, are too expensive and time consuming to adequately screen potential contaminants within a realistic timeframe. As a result, in vitro testing on cell cultures has been identified as an ideal alternative testing strategy for emerging contaminants...
March 6, 2018: Cytotechnology
D Piló, A B Barbosa, M A Teodósio, J Encarnação, F Leitão, P Range, L A Krug, J Cruz, L Chícharo
This study evaluated the impacts of submarine groundwater discharges (SGD) on a rocky intertidal community of South Portugal, during April-November 2011. Chlorophyll-a concentration was higher at the SGD site in respect to the Reference site. Epibenthic community structure differed between sites, with an increase in Chthamalus spp. and a decrease in macroalgae coverage at the SGD site. The abundance and body size of Mytilus galloprovincialis were consistently higher at the SGD site. During mid-spring, under potentially higher SGD and less favorable conditions for coastal phytoplankton, the ecophysiological condition of M...
February 23, 2018: Marine Environmental Research
M Milan, G Dalla Rovere, M Smits, S Ferraresso, P Pastore, M G Marin, S Bogialli, T Patarnello, L Bargelloni, V Matozzo
Glyphosate has been the most widely used herbicide worldwide over the last three decades, raising increasing concerns for its potential impacts on environmental and human health. Recent studies revealed that glyphosate occurs in soil, surface water, and groundwater, and residues are found at all levels of the food chain, such as drinking water, plants, animals, and even in humans. While research has demonstrated that glyphosate can induce a broad range of biological effects in exposed organisms, the global molecular mechanisms of action still need to be elucidated, in particular for marine species...
March 2, 2018: Environmental Pollution
Xizhi Huang, Zekang Liu, Zhe Xie, Sam Dupont, Wei Huang, Fangli Wu, Hui Kong, Liping Liu, Yanming Sui, Daohui Lin, Weiqun Lu, Menghong Hu, Youji Wang
Biochemical responses of the mussel Mytilus coruscus exposed to different concentrations of titanium dioxide nanoparticles (nano-TiO2 ) (0, 2.5, 10 mg L-1 ) and two pH levels (pH 8.1 and pH 7.3) for 14 days. Mussel responses were also investigated after a 7 days recovery period (pH 8.1 and no nanoparticle). Exposure to nano-TiO2 led changes in antioxidant indexes (superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), glutathione (GSH)), biotransformation enzyme activity (GST) and malondialdehyde level (MDA) in gills and digestive glands...
February 26, 2018: Marine Environmental Research
Christopher O Miles, Jane Kilcoyne, Pearse McCarron, Sabrina D Giddings, Thor Waaler, Thomas Rundberget, Ingunn A Samdal, Kjersti E Løvberg
Azaspiracids (AZAs) belong to a family of more than 50 polyether toxins originating from marine dinoflagellates such as Azadinium spinosum. All of the AZAs reported thus far contain a 21,22-dihydroxy group. Boric acid gel (BAG) can bind selectively to compounds containing vic-diols or α-hydroxycarboxylic acids via formation of reversible boronate complexes. Here we report use of BAG to selectively capture and release AZAs from extracts of blue mussels. Analysis of the extracts and BAG fractions by LC-MS showed that this procedure resulted in an excellent clean-up of the AZAs in the extract...
March 4, 2018: Journal of Agricultural and Food Chemistry
Cristina Pirrone, Federica Rossi, Simone Cappello, Marina Borgese, Giuseppe Mancini, Giovanni Bernardini, Rosalba Gornati
The large volumes of oily wastewater discharged to marine environment cause heavy impacts on the coastal marine ecosystem. The selection of an appropriate technology to reduce these impacts should be based on the respect of the discharge limits and on the effective assessment and monitoring of its effects on biological organism preservation. To this aim, we set up a controlled microcosm-scale system to compare the effects of a treated and untreated oily wastewater discharge in which the restore process is performed through a Membrane Bio-Reactor...
February 24, 2018: Aquatic Toxicology
G Fichi, S Carboni, J E Bron, J Ireland, M J Leaver, G Paladini
Ciliates have been reported as pathogens of many species of economically important bivalves. Mussel protozoan X (MPX), is an uncharacterised intracellular ciliate of mussels and has been widely reported in Mytilus spp. around the world. In order to characterise this ciliate, Mytilus edulis samples were collected from a site on the West coast of Scotland, and four different fixatives for histological examination were tested. Fresh preparations of mussel digestive glands were also examined by laser scanning confocal microscopy...
March 1, 2018: Journal of Invertebrate Pathology
Valerio Matozzo, Carlo Ercolini, Laura Serracca, Roberta Battistini, Irene Rossini, Giulia Granato, Elisabetta Quaglieri, Alberto Perolo, Livio Finos, Giuseppe Arcangeli, Daniela Bertotto, Giuseppe Radaelli, Bruno Chollet, Isabelle Arzul, Francesco Quaglio
The Gulf of La Spezia (northern Tyrrhenian Sea, Italy) is a commercially important area both as a shipping port and for mussel farming. Recently, there has been increased concern over environmental disturbances caused by anthropogenic activities such as ship traffic and dredging and the effects they have on the health of farmed mussels. This paper reports the results of microbiological and histological analyses, as well as of measurement of several biomarkers which were performed to assess the health status of mussels (Mytilus galloprovincialis) from four rearing sites in the Gulf of La Spezia...
February 28, 2018: Journal of Invertebrate Pathology
Wiebke Schmidt, David Raymond, David Parish, Ian G C Ashton, Peter I Miller, Carlos J A Campos, Jamie D Shutler
The need to ensure future food security and issues of varying estuarine water quality is driving the expansion of aquaculture into near-shore coastal waters. It is prudent to fully evaluate new or proposed aquaculture sites, prior to any substantial financial investment in infrastructure and staffing. Measurements of water temperature, salinity and dissolved oxygen can be used to gain insight into the physical, chemical and biological water quality conditions within a farm site, towards identifying its suitability for farming, both for the stock species of interest and for assessing the potential risk from harmful or toxic algae...
January 2018: Aquacultural Engineering
Michael Zuykov, Julia Anderson, Philippe Archambault, France Dufresne, Emilien Pelletier
During summer 2014-2017, wild mytilid mussels, highly infested with the pathogenic Coccomyxa-like microalgae, were collected along the Estuary and northwestern part of Gulf of St. Lawrence (Québec, Canada). Molecular identification showed that algae can be assigned to a single taxon, Coccomyxa sp. (KJ372210), whereas hosts are represented by Mytilus edulis, M. trossulus and hybrid between these two species. This is the first record of M. trossulus and hybrid among hosts of this pathogenic alga. Our results are indicative of a possible widespread distribution of Coccomyxa sp...
February 26, 2018: Journal of Invertebrate Pathology
Jane Kilcoyne, Pearse McCarron, Michael J Twiner, Frode Rise, Philipp Hess, Alistair L Wilkins, Christopher O Miles
Azaspiracids (AZAs) are marine biotoxins produced by the genera Azadinium and Amphidoma, pelagic marine dinoflagellates that may accumulate in shellfish resulting in human illness following consumption. The complexity of these toxins has been well documented, with more than 40 structural variants reported that are produced by dinoflagellates, result from metabolism in shellfish, or are extraction artifacts. Approximately 34 μg of a new AZA with MW 823 Da (AZA26 (3)) was isolated from blue mussels (Mytilus edulis), and its structure determined by MS and NMR spectroscopy...
February 28, 2018: Journal of Natural Products
Maria Schirone, Miriam Berti, Pierina Visciano, Francesco Chiumiento, Giacomo Migliorati, Rosanna Tofalo, Giovanna Suzzi, Federica Di Giacinto, Nicola Ferri
Lipophilic marine biotoxins include okadaic acid, pectenotoxin, yessotoxin and azaspiracid groups. The consumption of contaminated molluscs can lead to acute food poisoning syndromes depending on the exposure level. Regulatory limits have been set by Regulation (European Community, 2004a) No 853/2004 and LC-MS/MS is used as the official analytical method according to Regulation (European Community, 2011) No 15/2011. In this study specimens of mussels ( Mytilus galloprovincialis ) were collected along the coasts of the central Adriatic Sea during the years 2015-2017 and analyzed by the European harmonized Standard Operating Procedure...
2018: Frontiers in Microbiology
Yongxia Chen, Kaida Xu, Jiji Li, XiaoYan Wang, Yingying Ye, Pengzhi Qi
Complement component 3 (C3) plays a central role in the complement system whose activation is essential for all the important functions performed by this system. Here, a novel C3 gene, termed Mc-C3, was identified from thick shell mussel (Mytilus coruscus). The deduced Mc-C3 protein possessed the characteristic structure features present in its homologs and contained the A2M_N_2, ANATO, A2M, A2M_comp, A2M_recep, and C345C domains, as well as the C3 convertase cleavage site, thioester motif, and conserved Cys, His, and Glu residues...
February 24, 2018: Fish & Shellfish Immunology
Holly B C Pearson, Lorna J Dallas, Sean D W Comber, Charlotte B Braungardt, Paul J Worsfold, Awadhesh N Jha
Release of tritium (3 H) in the marine environment is of concern with respect to its potential bioaccumulation and detrimental impact on the biota. Previous studies have investigated the uptake and toxicity of this radionuclide in marine mussels, and the interaction of3 H with dissolved organic ligands and elevated temperature. However, despite the well-established view that toxicity is partly governed by chemical speciation, and that toxic effects of mixture of contaminants are not always additive, there have been no studies linking the prevailing chemistry of exposure waters with observed biological effects and tissue specific accumulation of3 H in combination with other constituents commonly found in natural waters...
February 23, 2018: Journal of Environmental Radioactivity
Rebeca Moreira, Patricia Pereiro, Pablo Balseiro, Massimo Milan, Marianna Pauletto, Luca Bargelloni, Beatriz Novoa, Antonio Figueras
Mediterranean mussels are a worldwide spread bivalve species with extraordinary biological success. One of the reasons of this success could be the reproduction strategy of bivalves, characterized by the presence of trochophore larvae. Larval development in bivalves has been a topic of raising interest in the scientific community but it deserves much more attention. The principal objective of this work was to study the transcriptomic profile of the ontogeny of Mytilus galloprovincialis analyzing the gene expression in different developmental stages, from oocytes to juveniles...
February 23, 2018: Developmental and Comparative Immunology
Marina Piscopo, Rosaria Notariale, Dea Rabbito, Juan Ausió, Oladokun Sulaiman Olanrewaju, Giulia Guerriero
In this work, we describe results of the reproductive health monitoring studies in Mytilus galloprovincialis following spermatozoa hsp70 expression and protamine-like protein properties. Mussels control (ctr) were released within cages for 30 days in three different marine sites near Naples (Campania, Italy): Bagnoli south (BAs) and Bagnoli north (BAn), both close to a disposal metallurgical factory and in Capo Miseno (CM). Studies of hsp70 gene expression carried out, by RT-qPCR, in mussel spermatozoa have shown varied expression levels, particularly 5, 13, and 15-fold more than ctr in CM, BAs, and BAn, respectively, indicating highest involvement of stress proteins in spermatozoa of mussels in Bagnoli...
February 24, 2018: Environmental Science and Pollution Research International
Miaomiao Bao, Liping Huo, Jiong Wu, Delong Ge, Zhenming Lv, Changfeng Chi, Zhi Liao, Huihui Liu
Bivalves use anti-oxidative enzyme systems to defend themselves against excessive reactive oxygen species, which are often catalyzed by environmental pollution. As a key member of anti-oxidative enzyme family, catalase plays a crucial role in scavenging the high level of reactive oxygen species to protect organisms against various oxidative stresses. In this study, a catalase homologue was identified from Mytilus coruscus (named McCAT, KX957929). The open reading frame of McCAT was 1844bp with a 5' untranslated region of 341bp and a 3' untranslated region of 927bp...
February 2018: Marine Pollution Bulletin
L P Salas-Yanquin, J M Navarro, J A Pechenik, J A Montory, O R Chaparro
Ashes settling into the sea from volcanic explosions expose suspension-feeding species to reduced seston quality. Adults and juveniles of the mussel Mytilus chilensis were exposed for 15days to the phytoplankton Isochrysis galbana together with various concentrations of ashes. We then quantified impact on survival and physiology. Although no individuals died during the experiment, by the end of the study clearance rates and oxygen consumption rates had decreased substantially, and tissue weight of mussels exposed to the highest ash concentrations declined substantially...
February 2018: Marine Pollution Bulletin
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