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domoic OR Pseudo-nitzschia

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https://www.readbyqxmd.com/read/28208796/recent%C3%A2-trends%C3%A2-in%C3%A2-marine%C3%A2-phycotoxins%C3%A2-from%C3%A2-australian%C3%A2-coastal%C3%A2-waters
#1
Penelope Ajani, D Tim Harwood, Shauna A Murray
Phycotoxins, which are produced by harmful microalgae and bioaccumulate in the  marine food web, are of growing concern for Australia. These harmful algae pose a threat to  ecosystem and human health, as well as constraining the progress of aquaculture, one of the fastest  growing food sectors in the world. With better monitoring, advanced analytical skills and an  increase in microalgal expertise, many phycotoxins have been identified in Australian coastal  waters in recent years...
February 9, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28160435/fast-analysis-of-domoic-acid-using-microchip-electrophoresis-with-laser-induced-fluorescence-detection
#2
Yongqiang Cheng, Cuilian Guo, Bin Zhao, Li Yang
A fast and effective method was developed to detect domoic acid based upon microchip electrophoresis combined with laser induced fluorescence detection. Through study of the gated injection process on the cross channel of microchip, low-voltage mode with relatively longer sample loading time was adopted to reduce the sample discrimination and improve the signal sensitivity. Fluorescein isothiocyanate was used as derivatizing reagent for domoic acid. Under the optimized conditions, domoic acid was completely separated in 60 s with separation efficiency of 1...
February 4, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28109640/acute-and-chronic-dietary-exposure-to-domoic-acid-in-recreational-harvesters-a-survey-of-shellfish-consumption-behavior
#3
Bridget E Ferriss, David J Marcinek, Daniel Ayres, Jerry Borchert, Kathi A Lefebvre
Domoic acid (DA) is a neurotoxin that is naturally produced by phytoplankton and accumulates in seafood during harmful algal blooms. As the prevalence of DA increases in the marine environment, there is a critical need to identify seafood consumers at risk of DA poisoning. DA exposure was estimated in recreational razor clam (Siliqua patula) harvesters to determine if exposures above current regulatory guidelines occur and/or if harvesters are chronically exposed to low levels of DA. Human consumption rates of razor clams were determined by distributing 1523 surveys to recreational razor clam harvesters in spring 2015 and winter 2016, in Washington, USA...
January 18, 2017: Environment International
https://www.readbyqxmd.com/read/28073557/diatom-nitzschia-navis-varingica-bacillariophyceae-and-its-domoic-acid-production-from-the-mangrove-environments-of-malaysia
#4
Suh Nih Tan, Sing Tung Teng, Hong Chang Lim, Yuichi Kotaki, Stephen S Bates, Chui Pin Leaw, Po Teen Lim
The distribution of the toxic pennate diatom Nitzschia was investigated at four mangrove areas along the coastal brackish waters of Peninsular Malaysia. Eighty-two strains of N. navis-varingica were isolated and established, and their identity confirmed morphologically and molecularly. Frustule morphological characteristics of the strains examined are identical to previously identified N. navis-varingica, but with a sightly higher density of the number of areolae per 1μm (4-7 areolae). Both LSU and ITS rDNAs phylogenetic trees clustered all strains in the N...
December 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073545/a-validated-uplc-ms-ms-method-for-the-surveillance-of-ten-aquatic-biotoxins-in-european-brackish-and-freshwater-systems
#5
Brett Greer, Sara E McNamee, Bas Boots, Lucia Cimarelli, Delphine Guillebault, Karim Helmi, Stefania Marcheggiani, Stefan Panaiotov, Ulrich Breitenbach, Reyhan Akçaalan, Linda K Medlin, Katrin Kittler, Christopher T Elliott, Katrina Campbell
Over the past few decades, there has been an increased frequency and duration of cyanobacterial Harmful Algal Blooms (HABs) in freshwater systems globally. These can produce secondary metabolites called cyanotoxins, many of which are hepatotoxins, raising concerns about repeated exposure through ingestion of contaminated drinking water or food or through recreational activities such as bathing/swimming. An ultra-performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS) multi-toxin method has been developed and validated for freshwater cyanotoxins; microcystins-LR, -YR, -RR, -LA, -LY and -LF, nodularin, cylindrospermopsin, anatoxin-a and the marine diatom toxin domoic acid...
May 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073532/toxigenic-algae-and-associated-phycotoxins-in-two-coastal-embayments-in-the-ebro-delta-nw-mediterranean
#6
Julia A Busch, Karl B Andree, Jorge Diogène, Margarita Fernández-Tejedor, Kerstin Toebe, Uwe John, Bernd Krock, Urban Tillmann, Allan D Cembella
Harmful Algal Bloom (HAB) surveillance is complicated by high diversity of species and associated phycotoxins. Such species-level information on taxonomic affiliations and on cell abundance and toxin content is, however, crucial for effective monitoring, especially of aquaculture and fisheries areas. The aim addressed in this study was to determine putative HAB taxa and related phycotoxins in plankton from aquaculture sites in the Ebro Delta, NW Mediterranean. The comparative geographical distribution of potentially harmful plankton taxa was established by weekly field sampling throughout the water column during late spring-early summer over two years at key stations in Alfacs and Fangar embayments within the Ebro Delta...
May 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073530/variation-in-the-abundance-of-pseudo-nitzschia-and-domoic-acid-with-surf-zone-type
#7
Alan L Shanks, Steven G Morgan, Jamie MacMahan, Ad J H M Reniers, Raphael Kudela, Marley Jarvis, Jenna Brown, Atsushi Fujimura, Lisa Ziccarelli, Chris Griesemer
Most harmful algal blooms (HAB) originate away from the shore and, for them to endanger human health, they must be first transported to shore after which they must enter the surf zone where they can be feed upon by filter feeders. The last step in this sequence, entrance into the surf zone, depends on surf zone hydrodynamics. During two 30-day periods, we sampled Pseudo-nitzschia and particulate domoic acid (pDA) in and offshore of a more dissipative surf zone at Sand City, California (2010) and sampled Pseudo-nitzschia in and out of reflective surf zones at a beach and rocky shores at Carmel River State Beach, California (2011)...
May 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073526/prevalence-of-algal-toxins-in-alaskan-marine-mammals-foraging-in-a-changing-arctic-and-subarctic-environment
#8
Kathi A Lefebvre, Lori Quakenbush, Elizabeth Frame, Kathy Burek Huntington, Gay Sheffield, Raphaela Stimmelmayr, Anna Bryan, Preston Kendrick, Heather Ziel, Tracey Goldstein, Jonathan A Snyder, Tom Gelatt, Frances Gulland, Bobette Dickerson, Verena Gill
Current climate trends resulting in rapid declines in sea ice and increasing water temperatures are likely to expand the northern geographic range and duration of favorable conditions for harmful algal blooms (HABs), making algal toxins a growing concern in Alaskan marine food webs. Two of the most common HAB toxins along the west coast of North America are the neurotoxins domoic acid (DA) and saxitoxin (STX). Over the last 20 years, DA toxicosis has caused significant illness and mortality in marine mammals along the west coast of the USA, but has not been reported to impact marine mammals foraging in Alaskan waters...
May 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073524/distribution-occurrence-and-biotoxin-composition-of-the-main-shellfish-toxin-producing-microalgae-within-european-waters-a-comparison-of-methods-of-analysis
#9
Sara E McNamee, Linda K Medlin, Jessica Kegel, Gary R McCoy, Robin Raine, Lucia Barra, Maria Valeria Ruggiero, Wiebe H C F Kooistra, Marina Montresor, Johannes Hagstrom, Eva Perez Blanco, Edna Graneli, Francisco Rodríguez, Laura Escalera, Beatriz Reguera, Simon Dittami, Bente Edvardsen, Joe Taylor, Jane M Lewis, Yolanda Pazos, Christopher T Elliott, Katrina Campbell
Harmful algal blooms (HABs) are a natural global phenomena emerging in severity and extent. Incidents have many economic, ecological and human health impacts. Monitoring and providing early warning of toxic HABs are critical for protecting public health. Current monitoring programmes include measuring the number of toxic phytoplankton cells in the water and biotoxin levels in shellfish tissue. As these efforts are demanding and labour intensive, methods which improve the efficiency are essential. This study compares the utilisation of a multitoxin surface plasmon resonance (multitoxin SPR) biosensor with enzyme-linked immunosorbent assay (ELISA) and analytical methods such as high performance liquid chromatography with fluorescence detection (HPLC-FLD) and liquid chromatography-tandem mass spectrometry (LC-MS/MS) for toxic HAB monitoring efforts in Europe...
May 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073500/initial-skill-assessment-of-the-california-harmful-algae-risk-mapping-c-harm-system
#10
Clarissa R Anderson, Raphael M Kudela, Mati Kahru, Yi Chao, Leslie K Rosenfeld, Frederick L Bahr, David M Anderson, Tenaya A Norris
Toxic algal events are an annual burden on aquaculture and coastal ecosystems of California. The threat of domoic acid (DA) toxicity to human and wildlife health is the dominant harmful algal bloom (HAB) concern for the region, leading to a strong focus on prediction and mitigation of these blooms and their toxic effects. This paper describes the initial development of the California Harmful Algae Risk Mapping (C-HARM) system that predicts the spatial likelihood of blooms and dangerous levels of DA using a unique blend of numerical models, ecological forecast models of the target group, Pseudo-nitzschia, and satellite ocean color imagery...
November 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073449/harmful-algal-bloom-forecast-system-for-sw-ireland-part-ii-are-operational-oceanographic-models-useful-in-a-hab-warning-system
#11
Caroline Cusack, Tomasz Dabrowski, Kieran Lyons, Alan Berry, Guy Westbrook, Rafael Salas, Conor Duffy, Glenn Nolan, Joe Silke
This study investigated the application of a three-dimensional physical hydrodynamic model in a harmful algal bloom forecast system for Bantry Bay, southwest Ireland. Modelled oceanographic conditions were studied and used to help understand observed changes in the chemical and biological patterns from the national biotoxins and phytoplankton monitoring program. The study focused on two toxic events in 2013. An upwelling event was predicted by the model prior to the appearance and population increase of potentially toxic diatoms, Pseudo-nitzschia, and associated domoic acid in shellfish...
March 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073448/modeling-the-transport-pathways-of-harmful-algal-blooms-in-the-iberian-coast
#12
L Pinto, M Mateus, A Silva
The prediction of the path of harmful algal blooms (HABs) along the coast can be achieved using numerical models of ocean circulation in order to reproduce the hydrodynamics of the study area. With this setting, our work aimed at the (1) study of key past events to evaluate the model ability to reproduce the transport pathways of blooms along the Iberian coast, and (2) to assess the relevance of such strictly physical approach. The simulations described here rely on the advection of lagrangian elements after a point release in a hypothetical location for bloom initiation, and the subsequent assessment of the influence of the surface currents transport on the extent of the bloom...
March 2016: Harmful Algae
https://www.readbyqxmd.com/read/28069959/climatic-regulation-of-the-neurotoxin-domoic-acid
#13
S Morgaine McKibben, William Peterson, A Michelle Wood, Vera L Trainer, Matthew Hunter, Angelicque E White
Domoic acid is a potent neurotoxin produced by certain marine microalgae that can accumulate in the foodweb, posing a health threat to human seafood consumers and wildlife in coastal regions worldwide. Evidence of climatic regulation of domoic acid in shellfish over the past 20 y in the Northern California Current regime is shown. The timing of elevated domoic acid is strongly related to warm phases of the Pacific Decadal Oscillation and the Oceanic Niño Index, an indicator of El Niño events. Ocean conditions in the northeast Pacific that are associated with warm phases of these indices, including changes in prevailing currents and advection of anomalously warm water masses onto the continental shelf, are hypothesized to contribute to increases in this toxin...
January 10, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28065552/occurrence-of-four-species-of-algae-in-the-marine-water-of-hong-kong
#14
Yemao Chai, Wen-Jing Deng, Xing Qin, Xiangrong Xu
Harmful algal blooms (HABs) have broken out frequently throughout the world in recent decades; they are caused by the rapid multiplication of algal cells in near-coastal waters polluted with nitrogen and phosphorus and greatly affect the quality of marine water and human health. Over the past several decades, climate change and increasing environmental degradation have provided favourable growth conditions for certain phytoplankton species. Therefore, it is essential to rapidly identify and enumerate harmful marine algae to control these species...
January 5, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28058244/occurrence-of-harmful-algal-species-and-shellfish-toxicity-in-sardinia-italy
#15
Anna Maria Bazzoni, Alessandro Graziano Mudadu, Giuseppa Lorenzoni, Igor Arras, Antonella Lugliè, Barbara Vivaldi, Valentina Cicotelli, Giovanna Sanna, Giuseppe Tedde, Salvatore Ledda, Enrico Alesso, Edoardo Marongiu, Sebastiano Virgilio
Sardinia (Italy, north-western Mediterranean) is a commercially important producer of edible bivalve molluscs. Since the early 2000s, it was subjected to recurring cases of mussel farm closures due to toxic algal poison. Here, we present the studies on toxin concentrations and the associated potentially toxic phytoplankton distribution and abundances carried out by a regular monitoring programme in Sardinian shellfish areas, from January to May 2015. Diarrheic shellfish poisoning (DSP) toxins were detected in several bivalve molluscs samples, while paralytic shellfish poisoning (PSP) and paralytic shellfish poisoning toxins were present just once, without exceeding the legal limits...
September 20, 2016: Italian Journal of Food Safety
https://www.readbyqxmd.com/read/28003060/two-decades-of-pseudo-nitzschia-spp-blooms-and-king-scallop-pecten-maximus-contamination-by-domoic-acid-along-the-french-atlantic-and-english-channel-coasts-seasonal-dynamics-spatial-heterogeneity-and-interannual-variability
#16
Bérengère Husson, Tania Hernández-Fariñas, Romain Le Gendre, Mathilde Schapira, Annie Chapelle
King scallop contamination (Pecten maximus) by domoic acid, a neurotoxin produced by some species of the diatom Pseudo-nitzschia, is highly problematic because of its lengthy retention in the bivalve tissue, leading to prolonged fishery closures. Data collected within the French Phytoplankton and Phycotoxin monitoring network (REPHY) over the 1995-2012 period were used to characterize the seasonal dynamics and the interannual variability of P.-nitzschia spp. blooms as well as the contamination of king scallop fishing grounds, in six contrasted bays distributed along the French Atlantic coast and English Channel...
January 2016: Harmful Algae
https://www.readbyqxmd.com/read/27995097/monitoring-the-presence-of-domoic-acid-in-the-production-areas-of-bivalve-molluscs
#17
Rachele Rossi, Olga Arace, Maria Giovanna Buonomo, Daniela Capozzo, Vincenzo Castellano, Samantha Imbimbo, Vittorio Soprano
Algal biotoxins, chemical compounds produced by some microscopic algae, constitute the phytoplankton. The mussels, feeding on phytoplankton, can accumulate these compounds to become themselves toxic. There have been several cases of food poisoning by consumption of contaminated shellfish. Such food poisoning have pushed our health care system to provide monitoring of shellfish in the framework of the monitoring plans carried out by AASSLL. In this paper we report the results obtained monitoring the presence of amnesic shellfish poisoning biotoxins, like domoic acid and its isomers, produced by Pseudonitzschia algae...
September 20, 2016: Italian Journal of Food Safety
https://www.readbyqxmd.com/read/27951467/cobalamin-independent-methionine-synthase-distribution-and-influence-on-vitamin-b12-growth-requirements-in-marine-diatoms
#18
Kelsey A Ellis, Natalie R Cohen, Carly Moreno, Adrian Marchetti
The requirement for cobalamin (vitamin B12) in microalgae is primarily a function of the type of methionine synthase present within their gene repertoires. Our study validates this concept through analysis of the distribution of B12-independent methionine synthase in ecologically relevant diatom genera, including the closely related bloom-forming genera Pseudo-nitzschia and Fragilariopsis. Growth and gene expression analysis of the vitamin B12-requiring version of the methionine synthase enzyme, METH, and the B12-independent version, METE, demonstrate that it is the presence of the METE gene which allows Fragilariopsis cylindrus to grow in the absence of B12...
October 25, 2016: Protist
https://www.readbyqxmd.com/read/27917011/an-unprecedented-coastwide-toxic-algal-bloom-linked-to-anomalous-ocean-conditions
#19
Ryan M McCabe, Barbara M Hickey, Raphael M Kudela, Kathi A Lefebvre, Nicolaus G Adams, Brian D Bill, Frances M D Gulland, Richard E Thomson, William P Cochlan, Vera L Trainer
A coastwide bloom of the toxigenic diatom Pseudo-nitzschia in spring 2015 resulted in the largest recorded outbreak of the neurotoxin, domoic acid, along the North American west coast. Elevated toxins were measured in numerous stranded marine mammals and resulted in geographically extensive and prolonged closures of razor clam, rock crab, and Dungeness crab fisheries. We demonstrate that this outbreak was initiated by anomalously warm ocean conditions. Pseudo-nitzschia australis thrived north of its typical range in the warm, nutrient-poor water that spanned the northeast Pacific in early 2015...
October 16, 2016: Geophysical Research Letters
https://www.readbyqxmd.com/read/27879646/integrating-scfv-into-xmap-assays-for-the-detection-of-marine-toxins
#20
Lisa C Shriver-Lake, Jinny L Liu, P Audrey Brozozog Lee, Ellen R Goldman, Richard Dietrich, Erwin Märtlbauer, George P Anderson
Marine toxins, such as saxitoxin and domoic acid are associated with algae blooms and can bioaccumulate in shell fish which present both health and economic concerns. The ability to detect the presence of toxin is paramount for the administration of the correct supportive care in case of intoxication; environmental monitoring to detect the presence of toxin is also important for prevention of intoxication. Immunoassays are one tool that has successfully been applied to the detection of marine toxins. Herein, we had the variable regions of two saxitoxin binding monoclonal antibodies sequenced and used the information to produce recombinant constructs that consist of linked heavy and light variable domains that make up the binding domains of the antibodies (scFv)...
November 21, 2016: Toxins
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