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https://www.readbyqxmd.com/read/29342840/evaluation-of-rapid-early-warning-approaches-to-track-shellfish-toxins-associated-with-dinophysis-and-alexandrium-blooms
#1
Theresa K Hattenrath-Lehmann, Mark W Lusty, Ryan B Wallace, Bennie Haynes, Zhihong Wang, Maggie Broadwater, Jonathan R Deeds, Steve L Morton, William Hastback, Leonora Porter, Karen Chytalo, Christopher J Gobler
Marine biotoxin-contaminated seafood has caused thousands of poisonings worldwide this century. Given these threats, there is an increasing need for improved technologies that can be easily integrated into coastal monitoring programs. This study evaluates approaches for monitoring toxins associated with recurrent toxin-producing Alexandrium and Dinophysis blooms on Long Island, NY, USA, which cause paralytic and diarrhetic shellfish poisoning (PSP and DSP), respectively. Within contrasting locations, the dynamics of pelagic Alexandrium and Dinophysis cell densities, toxins in plankton, and toxins in deployed blue mussels (Mytilus edulis) were compared with passive solid-phase adsorption toxin tracking (SPATT) samplers filled with two types of resin, HP20 and XAD-2...
January 13, 2018: Marine Drugs
https://www.readbyqxmd.com/read/29335824/broad-spectrum-resistance-of-pseudomonas-aeruginosa-from-shellfish-infrequent-acquisition-of-novel-resistance-mechanisms
#2
Ana Maravić, Ivica Šamanić, Matilda Šprung, Željana Fredotović, Nada Ilić, Josipa Dragičević, Jasna Puizina
Pseudomonas aeruginosa is one the most common multidrug-resistant pathogens worldwide. It has been previously detected in marine shellfish, but its antibiotic resistance in such environment has not been explored. By combining PCR detection of acquired genes, and resistance-nodulation-cell division (RND) efflux studying, we investigated the multifactorial resistance traits of 108 P. aeruginosa isolates recovered from wild-growing Mediterranean mussels (Mytilus galloprovincialis) in Croatia. Eleven different resistance profiles were found, with the main mechanism being the overexpression of intrinsic efflux pump(s), particularly MexAB-OprM...
January 15, 2018: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29333571/diurnal-variations-in-personal-care-products-in-seawater-and-mussels-at-three-mediterranean-coastal-sites
#3
Marina Picot-Groz, Hélène Fenet, Maria Jesus Martinez Bueno, David Rosain, Elena Gomez
The presence of personal care products (PCPs) in the marine environment is of major concern. PCPs, UV filters, and musks can enter the marine environment indirectly through wastewater or directly via recreational activities. We conducted this study to document patterns in the occurrence of seven PCPs at three coastal sites impacted by recreational activities during 1 day. The study focused on diurnal variations in these seven PCPs in seawater and indigenous mussels. In seawater, UV filters showed diurnal variations that mirrored variations in recreational activities at the sites...
January 15, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29330822/biochemical-changes-in-mussels-submitted-to-different-time-periods-of-air-exposure
#4
Madalena Andrade, Amadeu Soares, Etelvina Figueira, Rosa Freitas
Intertidal species face multiple stressors on a daily basis due to their particular habitat. The submergence at high tide in the aquatic environment and emergence at low tide to the aerial environment, associated with a wide variation of abiotic parameters, along with anthropogenic contamination are some of the daily stresses that these organisms are exposed to. With such a dynamic environment, organisms developed strategies that allow them to avoid or tolerate these stressors. Among these species, bivalves are some of the most hypoxia tolerant, being commonly used as a biomonitoring tool due to their capacity to accumulate pollutants from the environment and reflect the imposed toxic impacts...
January 13, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29314468/a-mineralogical-record-of-ocean-change-decadal-and-centennial-patterns-in-the-california-mussel
#5
Sophie J McCoy, Nicholas A Kamenos, Peter Chung, Timothy J Wootton, Catherine A Pfister
Ocean acidification, a product of increasing atmospheric carbon dioxide, may already have affected calcified organisms in the coastal zone, such as bivalves and other shellfish. Understanding species' responses to climate change requires the context of long-term dynamics. This can be particularly difficult given the longevity of many important species in contrast with the relatively rapid onset of environmental changes. Here, we present a unique archival dataset of mussel shells from a locale with recent environmental monitoring and historical climate reconstructions...
January 4, 2018: Global Change Biology
https://www.readbyqxmd.com/read/29306809/near-infra-red-spectroscopy-quantitative-modelling-of-bivalve-protein-lipid-and-glycogen-composition-using-single-species-versus-multi-species-calibration-and-validation-sets
#6
Jill K Bartlett, William A Maher, Matthew B J Purss
Near infrared spectroscopy (NIRS) quantitative modelling was used to measure the protein, lipid and glycogen composition of five marine bivalve species (Saccostrea glomerata, Ostrea angasi, Crassostrea gigas, Mytilus galloprovincialis and Anadara trapezia) from multiple locations and seasons. Predictive models were produced for each component using individual species and aggregated sample populations for the three oyster species (S. glomerata, O. angasi and C. gigas) and for all five bivalve species. Whole animal tissues were freeze dried, ground to >20μm and scanned by NIRS...
December 18, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29306034/role-of-mtor-in-autophagic-and-lysosomal-reactions-to-environmental-stressors-in-molluscs
#7
Susanna Sforzini, Michael N Moore, Caterina Oliveri, Anna Volta, Awadhesh Jha, Mohamed Banni, Aldo Viarengo
Lysosomal membrane stability (LMS) has been used in various organisms as a very sensitive biomarker of stress. However, despite the abundance of data about regulation of the autophagic process in mammals, in the invertebrates there is only limited mechanistic understanding. Marine mussels (Mytilus galloprovincialis Lam.) are bivalve molluscs, widely used as models in ecotoxicology and as environmental bioindicators of sea water quality. In order to elucidate this fundamental process, in the present study, mussels were exposed for 3 days to a "priority", ubiquitous environmental contaminant, benzo[a]pyrene (B[a]P) at different concentrations (i...
December 28, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29305989/the-immune-response-of-mytilus-edulis-hemocytes-exposed-to-vibrio-splendidus-lgp32-strain-a-transcriptomic-attempt-at-identifying-molecular-actors
#8
Marion Tanguy, Sophie Gauthier-Clerc, Jocelyne Pellerin, Jean-Michel Danger, Ahmed Siah
The marine mussel Mytilus edulis, tolerant to a wide range of environmental changes, combines a key role as a sentinel species for environmental monitoring programs and a significant economic importance. Mortality events caused by infective agents and parasites have not been described in mussels, which suggests an efficient immune system. This study aims at identifying the molecular mechanisms involved in the early immune responses M. edulis' hemocytes challenged with Vibrio splendidus LGP32 strain during 2, 4 and 6 h...
January 3, 2018: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29304456/impact-of-zinc-oxide-nanoparticles-and-ocean-acidification-on-antioxidant-responses-of-mytilus-coruscus
#9
Xizhi Huang, Yimeng Liu, Zekang Liu, Zihao Zhao, Sam Dupont, Fangli Wu, Wei Huang, Jianfang Chen, Menghong Hu, Weiqun Lu, Youji Wang
Increased production of engineered nanoparticles (NPs) has raised extensive concerns about the potential toxic effects on marine organisms. Extensive evidences documented the impact of ocean acidification (OA) on the physiology and fitness of bivalves. In the present study, we investigated the biochemical responses of the mussel Mytilus coruscus exposed to both nano-ZnO and low pH relevant for ocean acidification conditions for 14 d followed by a 7-d recovery period. Most biochemical indexes (superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), acid phosphatase (ACP) and alkaline phosphatase (ALP)) measured in gills and hemocytes were increased when the mussels were subject to low pH or high concentration of nano-ZnO, suggesting oxidative stress responses...
December 29, 2017: Chemosphere
https://www.readbyqxmd.com/read/29304406/multixenobiotic-resistance-in-mytilus-edulis-molecular-and-functional-characterization-of-an-abcg2-type-transporter-in-hemocytes-and-gills
#10
Yosra Ben Cheikh, Benoit Xuereb, Céline Boulangé-Lecomte, Frank Le Foll
Among the cellular protection arsenal, ABC transporters play an important role in xenobiotic efflux in marine organisms. Two pumps belonging to B and C subfamily has been identified in Mytilus edulis. In this study, we investigated the presence of the third major subtype ABCG2/BCRP protein in mussel tissues. Transcript was expressed in hemocytes and with higher level in gills. Molecular characterization revealed that mussel ABCG2 transporter shares the sequence and organizational structure with mammalian and molluscan orthologs...
December 28, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29300301/identification-and-antithrombotic-activity-of-peptides-from-blue-mussel-mytilus-edulis-protein
#11
Meiling Qiao, Maolin Tu, Zhenyu Wang, Fengjiao Mao, Hui Chen, Lei Qin, Ming Du
The blue mussel (Mytilus edulis) reportedly contains many bioactive components of nutritional value. Water-, salt- and acid-soluble M. edulis protein fractions were obtained and the proteins were trypsinized. The resultant peptides were analyzed by ultra-performance liquid chromatography quadrupole time of flight tandem mass spectrometry (UPLC-Q-TOF-MS/MS). 387 unique peptides were identified that matched 81 precursor proteins. Molecular mass distributions of the proteins and peptides were analyzed by sodium dodecyl sulfate-polyacryl amide gel electrophoresis (SDS-PAGE)...
January 4, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29291100/microencapsulated-diets-to-improve-bivalve-shellfish-aquaculture
#12
David Willer, David C Aldridge
Aquaculture is the fastest growing food sector and feeds over 3 billion people. Bivalve shellfish aquaculture makes up 25% of global aquaculture production and is worth annually US$19 billion, but continued growth is currently limited by suboptimal diets and limited tools for disease control. New advances in microencapsulation technology could provide an effective way to overcome these biological limitations. This study demonstrated that a new formulation of microencapsulated diet known as BioBullets could be ingested by a commercially farmed bivalve; the blue mussel Mytilus edulis...
November 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29278736/identification-and-characterization-of-a-novel-defensin-from-asian-green-mussel-perna-viridis
#13
Yuting Wang, Zhiyong Zeng, Xinhui Zhang, Qiong Shi, Chaogang Wang, Zhangli Hu, Hui Li
Defensin is one of the most diversified groups of antimicrobial peptides in invertebrate. In the present study, a novel defensin member referred as Pv-Def was identified and characterized from Asian green mussel Perna viridis. Using in silico survey of several EST databases released from diverse tissues of P. viridis, a single peptide referred as Pv-Def was predicted as defensin homologue with Mytilus counterparts. Further analysis on gene structure revealed that Pv-Def was 1001 nt in length and consisted of 3 exons and 2 introns...
December 23, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29274606/combined-effects-of-zno-nps-and-seawater-acidification-on-the-haemocyte-parameters-of-thick-shell-mussel-mytilus-coruscus
#14
Fangli Wu, Shuaikang Cui, Meng Sun, Zhe Xie, Wei Huang, Xizhi Huang, Liping Liu, Menghong Hu, Weiqun Lu, Youji Wang
Flow cytometry was used to investigate the immune parameters of haemocytes in thick-shell mussel Mytilus coruscus exposed to different concentrations of ZnO nanoparticles (NPs) (0, 2.5, and 10mgl-1) at two pH levels (7.3 and 8.1) for 14days following a recovery period of 7days. ZnO NPs significantly affected all of the immune parameters throughout the experiment. At high ZnO NPs concentrations, total haemocyte counting, phagocytosis, esterase, and lysosomal content were significantly decreased whereas haemocyte mortality and reactive oxygen species (ROS) were increased...
December 20, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29247680/changes-in-steroid-profiles-of-the-blue-mussel-mytilus-trossulus-as-a-function-of-season-stage-of-gametogenesis-sex-tissue-and-mussel-bed-depth
#15
Katarzyna Smolarz, Sandra Zabrzańska, Lucyna Konieczna, Anna Hallmann
This paper describes changes in the content of free steroid hormones e.g. testosterone (T), estradiol-17β (E2), estrone (E1) and estriol (E3) of Mytilus trossulus from the southern Baltic Sea as a function of season, stage of gametogenesis, sex, tissue (gonadal and somatic) and depth. The highest levels of T, E2, E1 and E3 were found in mussels sampled in spring and summer while the lowest levels were found in winter. This pattern was stable and was seen in both sexes and tissues in mussels from both mussel beds...
December 13, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29244952/metabolic-responses-of-mytilus-galloprovincialis-to-fullerenes-in-mesocosms-exposure-experiments
#16
Josep Sanchís, Marta Llorca, Mar Olmos, Gabriella Francesca Schirinzi, Cristina Bosch-Orea, Esteban Abad, Damia Barcelo, Marinella Farre
In this study, Mediterranean mussels (Mytilus galloprovincialis) were exposed through the diet to fullerene soot, at three concentrations in parallel to a control group. Their metabolomics response was assessed by high-performance liquid chromatography coupled to high-resolution mass spectrometry (HPLC-HRMS). The experiments were conducted in marine mesocosms, during 35 days (7 days of acclimatization, 21 days of exposure and 7 seven days of depuration). Real conditions were emulated in terms of physicochemical conditions of the habitat...
December 15, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29229237/accumulation-and-transformation-of-azaspiracids-in-scallops-chlamys-farreri-and-mussels-mytilus-galloprovincialis-fed-with-azadinium-poporum-and-response-of-antioxidant-enzymes
#17
Ying Ji, Jiangbing Qiu, Tian Xie, Pearse McCarron, Aifeng Li
Azaspiracid (AZA) producing microalgae have been reported internationally and could potentially impact a variety of seafood. Scallops (Chlamys farreri) and mussels (Mytilus galloprovincialis) from China were fed with the AZA2 producer, Azadinium poporum, to study uptake, metabolism and oxidative stress in the shellfish. LC-MS/MS showed significant accumulation and differential metabolism of AZA2 in the scallops and mussels. In mussels AZA2 was metabolized to AZA19, with subsequent decarboxylation to AZA6. In scallops no AZA19 or AZA6 was observed, however, a novel AZA metabolite was formed with that is isobaric with AZA19 ([M+H]+, m/z 886), but elutes at a different retention time...
December 8, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/29208501/autophagic-processes-in-mytilus-galloprovincialis-hemocytes-effects-of-vibrio-tapetis
#18
Teresa Balbi, Katia Cortese, Caterina Ciacci, Grazia Bellese, Luigi Vezzulli, Carla Pruzzo, Laura Canesi
Autophagy is a highly conserved and regulated catabolic process involved in maintaining cell homeostasis in response to different stressors. The autophagic machinery is also used as an innate immune mechanism against microbial infection. In invertebrates, that lack acquired immunity, autophagy may thus play a key role in the protection against potential pathogens. In aquatic molluscs, evidence has been provided for induction of autophagy by starvation and different environmental stressors; however, no information is available on autophagic pathways in the immune cells, the hemocytes...
December 2, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29197287/assessing-the-relationship-between-the-abundance-and-properties-of-microplastics-in-water-and-in-mussels
#19
Xiaoyun Qu, Lei Su, Hengxiang Li, Mingzhong Liang, Huahong Shi
Microplastic pollution is increasingly becoming a great environmental concern worldwide. Microplastics have been found in many marine organisms as a result of increasing plastic pollution within marine environments. However, the relationship between micoplastics in organisms and their living environment is still relatively poorly understood. In the present study, we investigated microplastic pollution in the water and the mussels (Mytilus edulis, Perna viridis) at 25 sites along the coastal waters of China...
November 29, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29183410/trophic-relationship-between-the-invasive-parasitic-copepod-mytilicola-orientalis-and-its-native-blue-mussel-mytilus-edulis-host
#20
M Anouk Goedknegt, David Shoesmith, A Sarina Jung, Pieternella C Luttikhuizen, Jaap van der Meer, Catharina J M Philippart, Henk W van der Veer, David W Thieltges
Invasive parasites can spill over to new hosts in invaded ecosystems with often unpredictable trophic relationships in the newly arising parasite-host interactions. In European seas, the intestinal copepod Mytilicola orientalis was co-introduced with Pacific oysters (Magallana gigas) and spilled over to native blue mussels (Mytilus edulis), with negative impacts on the condition of infected mussels. However, whether the parasite feeds on host tissue and/or stomach contents is yet unknown. To answer this question, we performed a stable isotope analysis in which we included mussel host tissue and the primary food sources of the mussels, microphytobenthos (MPB) and particulate organic matter (POM)...
November 29, 2017: Parasitology
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