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Pseudo-nitzschia

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https://www.readbyqxmd.com/read/29208978/algae-associated-with-coral-degradation-affects-risk-assessment-in-coral-reef-fishes
#1
Mark I McCormick, Randall P Barry, Bridie J M Allan
Habitat degradation alters the chemical landscape through which information about community dynamics is transmitted. Olfactory information is crucial for risk assessment in aquatic organisms as predators release odours when they capture prey that lead to an alarm response in conspecific prey. Recent studies show some coral reef fishes are unable to use alarm odours when surrounded by dead-degraded coral. Our study examines the spatial and temporal dynamics of this alarm odour-nullifying effect, and which substratum types may be responsible...
December 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29169567/sandwich-hybridization-probes-for-the-detection-of-pseudo-nitzschia-bacillariophyceae-species-an-update-to-existing-probes-and-a-description-of-new-probes
#2
Holly A Bowers, Roman Marin, James M Birch, Christopher A Scholin
New sandwich hybridization assay (SHA) probes for detecting Pseudo-nitzschia species (P. arenysensis, P. fraudulenta, P. hasleana, P. pungens) are presented, along with updated cross-reactivity information on historical probes (SHA and FISH; fluorescence in situ hybridization) targeting P. australis and P. multiseries. Pseudo-nitzschia species are a cosmopolitan group of diatoms that produce varying levels of domoic acid (DA), a neurotoxin that can accumulate in finfish and shellfish and transfer throughout the food web...
December 2017: Harmful Algae
https://www.readbyqxmd.com/read/29164356/investigating-the-impacts-of-treated-effluent-discharge-on-coastal-water-health-visakhapatnam-sw-coast-of-bay-of-bengal-india
#3
Aziz Ur Rahman Shaik, Haimanti Biswas, N Surendra Babu, N P C Reddy, Z A Ansari
The present study investigated the impacts of treated effluent discharge on physicochemical and biological properties of coastal waters from three pharmaceuticals situated along the coast of Visakhapatnam (SW Bay of Bengal). Seawater samples were collected (during the months of December 2013, March 2014 and April 2014) from different sampling locations (Chippada (CHP), Tikkavanipalem (TKP) and Nakkapalli (NKP)) at 0- and 30-m depths within 2-km radius (0.5 km = inner, 1 km = middle and 2 km = outer sampling circles) from the marine outfall points...
November 21, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29160864/clonal-expansion-behind-a-marine-diatom-bloom
#4
Maria Valeria Ruggiero, Domenico D'Alelio, Maria Immacolata Ferrante, Mariano Santoro, Laura Vitale, Gabriele Procaccini, Marina Montresor
Genetic diversity is what selection acts on, thus shaping the adaptive potential of populations. We studied micro-evolutionary patterns of the key planktonic diatom Pseudo-nitzschia multistriata at a long-term sampling site over 2 consecutive years by genotyping isolates with 22 microsatellite markers. We show that both sex and vegetative growth interplay in shaping intraspecific diversity. We document a brief but massive demographic and clonal expansion driven by strains of the same mating type. The analysis of an extended data set (6 years) indicates that the genetic fingerprint of P...
November 21, 2017: ISME Journal
https://www.readbyqxmd.com/read/29124474/growth-chain-formation-and-toxin-production-by-southern-brazilian-pseudo-nitzschia-isolates-under-laboratory-conditions
#5
Pedro Rebelo Wadt, Luiz Laureno Mafra, Camila Prestes Dos Santos Tavares, Luciano Felício Fernandes, Luís Antonio de Oliveira Proença
Pseudo-nitzschia is a diatom genus capable of producing the neurotoxin domoic acid (DA), which has been related to mortalities of marine vertebrates, and the amnesic shellfish poisoning (ASP) in human consumers of contaminated bivalves. This study reports DA production among Pseudo-nitzschia strains isolated from shellfish farming areas in southern Brazil. Twenty-seven cultures of potentially toxigenic Pseudo-nitzschia species were established. Growth, stepped-chain formation, and DA production were evaluated in static, intermittently illuminated (12:12 photoperiod) batch cultures for 12 selected strains, and under continuous light and/or turbulence for a single Pseudo-nitzschia calliantha strain...
November 9, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29122243/the-influence-of-salinity-in-the-domoic-acid-effect-on-estuarine-phytoplankton-communities
#6
Elise Van Meerssche, James L Pinckney
Toxic species of the diatom genus Pseudo-nitzschia, observed worldwide from coastal waters to the open ocean, produce the neurotoxin domoic acid (DA). DA is an important environmental and economic hazard due to shellfish contamination with subsequent effects on higher trophic levels. Previous research has demonstrated that, among other environmental factors, salinity influences the abundance and toxicity of Pseudo-nitzschia. In this study, the environmental factors driving the growth of Pseudo-nitzschia and the production of dissolved DA (dDA) in North Inlet estuary were examined...
November 2017: Harmful Algae
https://www.readbyqxmd.com/read/29064395/growth-toxin-production-and-allelopathic-effects-of-pseudo-nitzschia-multiseries-under-iron-enriched-conditions
#7
Bruna Fernanda Sobrinho, Luana Mocelin de Camargo, Leonardo Sandrini-Neto, Cristian Rafael Kleemann, Eunice da Costa Machado, Luiz Laureno Mafra
In order to assess the effects of Fe-enrichment on the growth and domoic acid (DA) production of the toxigenic diatom Pseudo-nitzschia multiseries, static cultures that received the addition of different iron (Fe) concentrations were maintained for 30 days. Intra- and extracellular DA concentrations were evaluated over time, and growth and chain-formation were compared to those of non-toxic diatoms, Bacillaria sp. Growth rates of P. multiseries (μ = 0.45-0.73 d(-1)) were similar among cultures containing different Fe concentrations...
October 24, 2017: Marine Drugs
https://www.readbyqxmd.com/read/29031804/transcriptional-response-after-exposure-to-domoic-acid-producing-pseudo-nitzschia-in-the-digestive-gland-of-the-mussel-mytilus-galloprovincialis
#8
Antonio J Pazos, Pablo Ventoso, Roi Martínez-Escauriaza, M Luz Pérez-Parallé, Juan Blanco, Juan C Triviño, José L Sánchez
Bivalve molluscs are filter feeding species that can accumulate biotoxins in their body tissues during harmful algal blooms. Amnesic Shellfish Poisoning (ASP) is caused by species of the diatom genus Pseudo-nitzschia, which produces the toxin domoic acid. The Mytilus galloprovincialis digestive gland transcriptome was de novo assembled based on the sequencing of 12 cDNA libraries, six obtained from control mussels and six from mussels naturally exposed to domoic acid-producing diatom Pseudo-nitzschia australis...
October 12, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/29021833/what-california-sea-lions-exposed-to-domoic-acid-might-teach-us-about-autism-lessons-for-predictive-and-preventive-medicine
#9
REVIEW
Garet Paul Lahvis
Autism spectrum disorder (ASD) shares many biological and behavioral similarities with the deleterious effects of domoic acid (DA) exposure. DA is produced by marine algae and most commonly by species of Pseudo-nitzschia. Humans and marine mammals can be exposed to DA when they consume whole fish or shellfish. The mammalian fetus is highly sensitive to the deleterious effects of DA exposure. Both ASD and exposures to toxic levels of DA feature repetitive behaviors, challenges with social interaction, and seizures...
September 2017: EPMA Journal
https://www.readbyqxmd.com/read/28962985/domoic-acid-in-a-marine-pelagic-food-web-exposure-of-southern-right-whales-eubalaena-australis-to-domoic-acid-on-the-pen%C3%A3-nsula-vald%C3%A3-s-calving-ground-argentina
#10
Valeria C D'Agostino, Mariana Degrati, Viviana Sastre, Norma Santinelli, Bernd Krock, Torben Krohn, Silvana L Dans, Mónica S Hoffmeyer
The gulfs that surround Península Valdés (PV), Golfo Nuevo and Golfo San José in Argentina, are important calving grounds for the southern right whale Eubalaena australis. However, high calf mortality events in recent years could be associated with phycotoxin exposure. The present study evaluated the transfer of domoic acid (DA) from Pseudo-nitzschia spp., potential producers of DA, to living and dead right whales via zooplanktonic vectors, while the whales are on their calving ground at PV. Phytoplankton and mesozooplankton (primary prey of the right whales at PV and potential grazers of Pseudo-nitzschia cells) were collected during the 2015 whale season and analyzed for species composition and abundance...
September 2017: Harmful Algae
https://www.readbyqxmd.com/read/28962980/nutrient-ratios-influence-variability-in-pseudo-nitzschia-species-diversity-and-particulate-domoic-acid-production-in-the-bay-of-seine-france
#11
Maxine Thorel, Pascal Claquin, Mathilde Schapira, Romain Le Gendre, Philippe Riou, Didier Goux, Bertrand Le Roy, Virginie Raimbault, Anne-Flore Deton-Cabanillas, Pauline Bazin, Valérie Kientz-Bouchart, Juliette Fauchot
The population dynamics of different Pseudo-nitzschia species, along with particulate domoic acid (pDA) concentrations, were studied from May 2012 to December 2013 in the Bay of Seine (English Channel, Normandy). While Pseudo-nitzschia spp. blooms occurred during the two years of study, Pseudo-nitzschia species diversity and particulate domoic acid concentrations varied greatly. In 2012, three different species were identified during the spring bloom (P. australis, P. pungens and P. fraudulenta) with high pDA concentrations (∼1400ngl(-1)) resulting in shellfish harvesting closures...
September 2017: Harmful Algae
https://www.readbyqxmd.com/read/28962972/insights-into-the-harmful-algal-flora-in-northwestern-mediterranean-coastal-lagoons-revealed-by-pyrosequencing-metabarcodes-of-the-28s-rrna-gene
#12
Daniel Grzebyk, Stéphane Audic, Bernard Lasserre, Eric Abadie, Colomban de Vargas, Béatrice Bec
This study investigated the genetic diversity of phytoplankton communities in six shallow lagoons located on the French coast of the northwestern Mediterranean Sea that represented a trophic gradient ranging from oligotrophic to hypereutrophic. The phytoplankton communities were sampled once a month from spring (May) to the beginning of autumn (September/early October) in 2012 and fractionated by size. Metabarcodes were generated from cDNAs by targeting the D1-D2 region of the 28S rRNA gene and pyrosequenced using Roche 454 technology...
September 2017: Harmful Algae
https://www.readbyqxmd.com/read/28916171/neurobehavioral-assessment-of-mice-following-repeated-oral-exposures-to-domoic-acid-during-prenatal-development
#13
Motohiro Shiotani, Toby B Cole, Sungwoo Hong, Julie Ju Young Park, William C Griffith, Thomas M Burbacher, Tomomi Workman, Lucio G Costa, Elaine M Faustman
Domoic acid (DA) is an algal toxin which has been associated with significant neurotoxicity in humans, non-human primates, rodents, and marine mammals. Developmental exposure to DA is believed to result in neurotoxicity that may persist into adulthood. DA is produced by harmful algal blooms of Pseudo-nitzschia, raising concerns about the consumption of contaminated seafood. We evaluated oral exposures to DA during pregnancy in mice. Doses of 0 (vehicle), 1 or 3mg/kg/d of DA were administered by gavage to C57BL/6J mice on gestational days 10 to 17...
September 13, 2017: Neurotoxicology and Teratology
https://www.readbyqxmd.com/read/28817087/the-preparation-and-identification-of-a-monoclonal-antibody-against-domoic-acid-and-establishment-of-detection-by-indirect-competitive-elisa
#14
Abdullah F U H Saeed, Sumei Ling, Jun Yuan, Shihua Wang
Domoic acid (DA) is a potent toxin, marine biotoxin, and primarily produced by Pseudo-nitzschia. The DA hapten was coupled with bovine serum albumin (BSA), and ovalbumin (OVA) as carrier proteins. DA-BSA conjugate was used as immunogen and DA-OVA as coating antigen. Cell fusion between spleen cells and sp2/0 myeloma cells developed 1C3 hybridoma clone producing 1C3 monoclonal antibody (mAb). Hybridoma was injected into the mice to produce ascites, and further purified by caprylic acid/ammonium sulfate method...
August 17, 2017: Toxins
https://www.readbyqxmd.com/read/28755719/understanding-the-blob-bloom-warming-increases-toxicity-and-abundance-of-the-harmful-bloom-diatom-pseudo-nitzschia-in-california-coastal-waters
#15
Zhi Zhu, Pingping Qu, Feixue Fu, Nancy Tennenbaum, Avery O Tatters, David A Hutchins
The toxic diatom genus Pseudo-nitzschia produces environmentally damaging harmful algal blooms (HABs) along the U.S. west coast and elsewhere, and a recent ocean warming event coincided with toxic blooms of record extent. This study examined the effects of temperature on growth, domoic acid toxin production, and competitive dominance of two Pseudo-nitzschia species from Southern California. Growth rates of cultured P. australis were maximal at 23°C (∼0.8d(-1)), similar to the maximum temperature recorded during the 2014-2015 warming anomaly, and decreased to ∼0...
July 2017: Harmful Algae
https://www.readbyqxmd.com/read/28755714/pseudo-nitzschia-simulans-sp-nov-bacillariophyceae-the-first-domoic-acid-producer-from-chinese-waters
#16
Yang Li, Chun Xiu Huang, Guo Shuang Xu, Nina Lundholm, Sing Tung Teng, Haiyan Wu, Zhijun Tan
The genus Pseudo-nitzschia has attracted attention because of production of the toxin, domoic acid (DA), causing Amnesic Shellfish Poisoning (ASP). Pseudo-nitzschia blooms occur frequently in Chinese coastal waters, and DA has been detected in several marine organisms, but so far no Pseudo-nitzschia strains from Chinese waters have been shown to produce DA. In this study, monoclonal Pseudo-nitzschia strains were established from Chinese coastal waters and examined using light microscopy, electron microscopy and molecular markers...
July 2017: Harmful Algae
https://www.readbyqxmd.com/read/28652566/a-high-resolution-melting-method-for-the-molecular-identification-of-the-potentially-toxic-diatom-pseudo-nitzschia-spp-in-the-mediterranean-sea
#17
Laura Pugliese, Silvia Casabianca, Federico Perini, Francesca Andreoni, Antonella Penna
The aim of this study was to develop and validate a high resolution melting (HRM) method for the rapid, accurate identification of the various harmful diatom Pseudo-nitzschia species in marine environments. Pseudo-nitzschia has a worldwide distribution and some species are toxic, producing the potent domoic acid toxin, which poses a threat to both human and animal health. Hence, it is important to identify toxic Pseudo-nitzschia species. A pair of primers targeting the LSU rDNA of the genus Pseudo-nitzschia was designed for the development of the assay and its specificity was validated using 22 control DNAs of the P...
June 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28602251/analysis-of-sterols-in-selected-bloom-forming-algae-in-china
#18
Hui-Xia Geng, Ren-Cheng Yu, Zhen-Fan Chen, Quan-Cai Peng, Tian Yan, Ming-Jiang Zhou
Sterols, a group of stable lipid compounds, are often used as biomarkers in marine biogeochemical studies to indicate sources of organic matter. In this study, sterols in 13 species of major bloom-forming algae in China, which belong to Dinophyceae, Bacillariophyceae, Ulvophyceae, and Pelagophyceae, were analyzed with gas chromatography-mass spectrometry (GC-MS) to test their feasibility in representing different types of harmful algal blooms (HABs). It was found that (24Z)-stigmasta-5,24-dien-3β-ol (28-isofucosterol) was a major sterol component in green-tide forming macroalga Ulva prolifera...
June 2017: Harmful Algae
https://www.readbyqxmd.com/read/28429538/finding-a-partner-in-the-ocean-molecular-and-evolutionary-bases-of-the-response-to-sexual-cues-in-a-planktonic-diatom
#19
Swaraj Basu, Shrikant Patil, Daniel Mapleson, Monia Teresa Russo, Laura Vitale, Cristina Fevola, Florian Maumus, Raffaella Casotti, Thomas Mock, Mario Caccamo, Marina Montresor, Remo Sanges, Maria Immacolata Ferrante
Microalgae play a major role as primary producers in aquatic ecosystems. Cell signalling regulates their interactions with the environment and other organisms, yet this process in phytoplankton is poorly defined. Using the marine planktonic diatom Pseudo-nitzschia multistriata, we investigated the cell response to cues released during sexual reproduction, an event that demands strong regulatory mechanisms and impacts on population dynamics. We sequenced the genome of P. multistriata and performed phylogenomic and transcriptomic analyses, which allowed the definition of gene gains and losses, horizontal gene transfers, conservation and evolutionary rate of sex-related genes...
July 2017: New Phytologist
https://www.readbyqxmd.com/read/28427568/inter-and-intra-specific-growth-and-domoic-acid-production-in-relation-to-nutrient-ratios-and-concentrations-in-pseudo-nitzschia-phosphate-an-important-factor
#20
Kimberley A Lema, Marie Latimier, Élisabeth Nézan, Juliette Fauchot, Mickael Le Gac
The factors responsible for inducing the synthesis of toxins and responses from toxic phytoplankton blooms remain unclear. In this study we compare the influence of genotypic (at both the intra and interspecific levels) and environmental factors (nutrient concentration and ratio) on growth (in terms of cell densities) and domoic acid (DA) production in three Pseudo-nitzschia species: P. australis, P.pungens and P.fradulenta. A strong phosphate effect was detected. More precisely, a low initial concentration in phosphate, even at high initial nitrogen and silicate concentrations, induced the highest DA concentrations and the lowest cell densities in all strains/species studied...
April 2017: Harmful Algae
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