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| Registros recuperados: 29 | |
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| Gomes,Ana Lucia Silva; Costa,Jesaías Ismael da; Benetton,Maria Linda Flora de Novaes; Bernardino,Geraldo; Belem-Costa,Andrea. |
| ABSTRACT: The dinoflagellate Piscinoodinium pillulare is a parasite with low parasitic specificity and unspecific geographical distribution. This research reported a simple and practical method - the principle of spontaneous sedimentation - to identify the presence of P. pillulare during massive infestations which does not require using precision equipment. Agitation in water of the gill arches of infested fish will elicit, after a period of rest, recording the accumulation of trophonts in the bottom of flasks. The method was applied during outbreaks of P. pillulare in tambaqui, Colossoma macropomum and matrinxã, Brycon amazonicus, in fish farms of the Amazon region and proved to be effective. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish parasite; Dinoflagellate; Piscinoodiniasis. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000700501 |
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| Percopo, Isabella; Siano, Raffaele; Rossi, Rachele; Soprano, Vittorio; Sarno, Diana; Zingone, Adriana. |
| A new photosynthetic planktonic marine dinoflagellate, Azadinium dexteroporum sp. nov., is described from the Gulf of Naples (South Tyrrhenian Sea, Mediterranean Sea). The plate formula of the species, Po, cp, X, 4, 3a, 6, 6C, 5?S, 6'" and 2, is typical for this recently described genus. Azadinium dexteroporum is the smallest rep-resentative of the genus (8.5m average length, 6.2m average width) and shares the presence of a small antapical spine with the type species A.spinosum and with A.polongum. However, it differs from all other Azadinium species for the markedly asymmetrical Po plate and the position of the ventral pore, which is located at the right posterior end of the Po plate. Another peculiarity of A.dexteroporum is the pronounced concavity of... |
| Tipo: Text |
Palavras-chave: Azadinium; Azaspiracid; Dinoflagellate; LC; MS-TOF; LTER-MC; Mediterranean Sea; Phylogeny; Taxonomy. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00171/28199/27278.pdf |
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| Le Bec, Claude; Legendre, Aurelie; Messiaen, Gregory. |
| Time series of physico-chemical data and concentrations (cell L-1) of the toxic dinoflagellate Alexandrium minutum collected in the Rance macrotidal estuary (Brittany, France) were analyzed to understand the physico-chemical processes of the estuary and their relation to changes in bloom development from 1996 to 2009. The construction of the tidal power plant in the north and the presence of a lock in the south have greatly altered hydrodynamics, blocking the zone of maximum turbidity upstream, in the narrowest part of the estuary. Alexandrium minutum occurs in the middle part of the estuary. Most physical and chemical parameters of the Rance estuary are similar to those observed elsewhere in Brittany with water temperatures between 15–18 °C, slightly... |
| Tipo: Text |
Palavras-chave: Harmful algae; Dinoflagellate; Nutrients; Eutrophication; Drainage basin; Land runoff. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00341/45257/44698.pdf |
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| Penaud, Aurelie; Hardy, William; Lambert, Clement; Marret, Fabienne; Masure, Edwige; Seryais, Thomas; Siano, Raffaele; Wary, Melanie; Mertens, Kenneth. |
| Dinoflagellates are part of the marine plankton and about 200 species produce a cyst (dinocyst) during their life cycle, these organic-walled sexually-produced cysts being fossilizable in sediments for hundreds of millions of years. Over the past 40–50 years, dinocysts have led to major advances on Mesozoic-Cenozoic research, in terms of biostratigraphy and paleogeogeography. Dinocyst taxonomy has then been continuously revised, with the tabulation being the main morphological link between living dinoflagellates and fossilized cysts. Over the Quaternary, and based on the principle of uniformitarianism (i.e. species ecology did not change through time), relationships between modern assemblages and present-day environmental factors controlling their... |
| Tipo: Text |
Palavras-chave: Dinoflagellate; Cyst-motile stage relationship; Modern dinocyst distribution; Paleoecology; Biostratigraphy; Ancient DNA. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00463/57476/59749.pdf |
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| Jauffrais, Thierry; Contreras, Andrea; Herrenknecht, Christine; Truquet, Philippe; Sechet, Veronique; Tillmann, Urban; Hess, Philipp. |
| Azadinium spinosum, a small toxic dinoflagellate, was recently isolated and identified as a primary producer of azaspiracid toxins (AZAs). Previous experiments related to AZA accumulation in blue mussels upon direct feeding with A. spinosum revealed increased mussel mortality and had negative effects on the thickness of the digestive gland tubules. Therefore we conducted follow up experiments in order to study effects of A. spinosum on mussel feeding behaviour. Individual assessment of mussel feeding time activity (FTA), clearance rate (CR), filtration rate (TFR), absorption rate (AR), faeces and pseudofaeces production were carried out on mussel fed either toxic (A. spinosum) or non-toxic (Isochrisis aff. galbana (T-Iso)) diets. Furthermore, AZA... |
| Tipo: Text |
Palavras-chave: Bivalve molluscs; Mussel; Ecophysiology; AZA biotransformation; AZA accumulation; Trophic transfer; Dinoflagellate; Azaspiracid. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00090/20174/17832.pdf |
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| Wildish, David; Lassus, Patrick; Martin, Jennifer; Saulnier, Alinne; Bardouil, Michele. |
| The effects of toxic and non-toxic strains of Alexandrium sp. on the initial feeding responses of the Pacific oyster Crassostrea gigas were determined by continuous monitoring of the clearance rate of individual oysters. This was determined fluorometrically by loss of fluorescence of live microalgae introduced as food. Feeding oysters with toxic or non-toxic A. tamarense and toxic A. fundyense resulted in stop/start clearance behaviour. In contrast, control oysters fed a reference microalga, Isochrysis sp., known to support their growth, did not exhibit this behavior. Pacific oysters acclimated to Isochrysis sp., fed mixtures of Alexandrium/Isochrysis, showed further evidence of stop/start clearance. Exposure for periods up to 48 hours with non-toxic A.... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Physiologie alimentaire; Microalgues toxiques; Dinoflagellés; Paralytic shellfish poisoning; Crassostrea gigas; Feeding physiology; Toxic microalgae; Dinoflagellate; Paralytic shellfish poisoning. |
| Ano: 1998 |
URL: https://archimer.ifremer.fr/doc/1998/publication-877.pdf |
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| Tichadou, Lucia; Glaizal, Mathieu; Armengaud, Alexis; Grossel, Hubert; Lemee, Rodolphe; Kantin, Roger; Lasalle, Jean-luc; Drouet, Geneveve; Rambaud, Loic; Malfait, Philippe; De Haro, Luc. |
| Objective. Ostreopsis ovata and Ostreopsis siamensis are tropical unicellular algae that have been found recently in the Mediterranean. Both of these dinoflagellates produce palytoxin (PTX)-like toxins that are powerful vasoconstrictors in mammals. Since 2003, Ostreopsis blooms in Italy and Spain have been accompanied by reports of respiratory problems and skin/mucosa irritation in persons in contact with toxic microalgal cells (epiphytes, plankton, or sea spray) or associated toxins. Methods. In France, a surveillance network has been set up to monitor water conditions and to protect swimmers from contamination due to Ostreopsis. Results. Between 2006 and 2009, a total of nine blooms were observed on the French Mediterranean coast including five that led... |
| Tipo: Text |
Palavras-chave: Dinoflagellate; Algal bloom; Ostreopsis; Mediterranean Sea; Palytoxin. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00016/12716/9694.pdf |
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| Castaing, Jean-baptiste; Masse, A.; Sechet, Veronique; Sabiri, N. -e.; Pontie, M.; Haure, Joel; Jaouen, P.. |
| In this study, an original use of immersed microfiltration membranes (mean pore size equal to 0.2 mu m) is investigated for the total removal of toxic dinoflagellates from seawater. Using a membrane autopsy and fouling model approach and the use of fouling indexes (called Pore Blocking Index, Pore Constriction Index and Cake Filtration Index), three dinoflagellate suspensions (Heterocapsa triquetra, Alexandrium minutum and Prorocentrum lima) have been microfiltered in order to study the influence of micro-algal species and its concentrations (1,000 and 30,000 cells/mL) on filtration yield and membrane fouling mechanisms. Results showed that all micro-algae have been retained after 180 min of microfiltration. At 30,000 cells/mL, permeate fluxes declined... |
| Tipo: Text |
Palavras-chave: Red tide; Dinoflagellate; Microfiltration; Membrane fouling mechanisms; Semi-closed aquaculture basins. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00041/15246/14016.pdf |
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| Silva,Luiza Nicoleite da; Medeiros,Caroline Modena de; Cavalcante,Kaoli Pereira; Cardoso,Luciana de Souza. |
| ABSTRACT Ceratium furcoides has received attention due its invasive behavior in South America and consequent alterations in local phytoplankton communities. Pedalinhos Lake had been dominated by chlorophytes until 2015, when the first occurrence of this dinoflagellate was detected. In order to investigate the colonization process of this species, we monitored the meteorological variables and phytoplankton abundance of this urban lake on a weekly basis from September 2015 to September 2018. At the beginning of the invasion process (Year 1), a peak density of 10,170 ind.mL-1 was recorded, with a significant decrease to 23 ind.mL-1, indicating an initial, unstable process of adaptation, with notable oscillation and reduction of cyanobacterial blooms. At this... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dinoflagellate; Invasive species; Shallow lake; Subtropical; Southern Brazil. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000400654 |
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| Gas, F; Pinto, L; Baus, B; Gaufres, L; Crassous, Marie-pierre; Compere, Chantal; Quemeneur, E. |
| Harmful algal blooms represent a major threat to marine production, and particularly to shellfish farming. Alexandrium minutum, which causes paralytic shellfish poisoning, is occurring with increasing frequency along European coasts. Current regulatory methods to analyze environmental samples are tedious and time consuming because they require taxonomists and involve animal experiments. New rapid detection methods, such as immunoassays, are needed to ensure a fast alert system and for field studies of algal ecodynamics. Rat monoclonal antibodies were raised and selected for their ability to specifically recognize a surface antigen for the A. minutum strain AM89BM from the Bay of Morlaix, France. A whole-cell ELISA was designed, leading to the selection of... |
| Tipo: Text |
Palavras-chave: Monoclonal antibody; Harmful algal bloom; Enzyme linked immunosorbent assay; Dinoflagellate. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4647.pdf |
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| Luo, Zhaohe; Mertens, Kenneth; Nezan, Elisabeth; Gu, Li; Pospelova, Vera; Thoha, Hikmah; Gu, Haifeng. |
| The dinoflagellate order Peridiniales encompasses several well circumscribed families. However, the family level of some genera, such as Bysmatrum and Vulcanodinium, has remained elusive for many years. Four Peridinium-like strains were established from the Atlantic coast of France and North Sulawesi, Indonesia through cyst germination or isolation of single cells. The cyst-theca relationship was established on specimens from the French Atlantic. Their morphologies were examined using light, scanning and transmission electron microscopy. The cells were characterized by a much larger epitheca relative to the hypotheca, a large anterior sulcal (Sa) plate deeply intruding the epitheca and a small first anterior intercalary plate. The plate formula was... |
| Tipo: Text |
Palavras-chave: Bysmatrum; Cyst; Dinoflagellate; Eyespot; Peridiniales; Plate overlap. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00489/60112/63564.pdf |
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| Luo, Zhaohe; Hu, Zhangxi; Tang, Yingzhong; Mertens, Kenneth; Leaw, Chui Pin; Lim, Po Teen; Teng, Sing Tung; Wang, Lei; Gu, Haifeng. |
| The genus Gymnodinium includes many morphologically similar species, but molecular phylogenies show that it is polyphyletic. Eight strains of Gymnodinium impudicum, Gymnodinium dorsalisulcum and a novel Gymnodinium‐like species from Chinese and Malaysian waters and the Mediterranean Sea were established. All of these strains were examined with LM, SEM and TEM. SSU, LSU and internal transcribed spacers rDNA sequences were obtained. A new genus, Wangodinium, was erected to incorporate strains with a loop‐shaped apical structure complex (ASC) comprising two rows of amphiesmal vesicles, here referred to as a new type of ASC. The chloroplasts of Wangodinium sinense are enveloped by two membranes. Pigment analysis shows that peridinin is the main accessory... |
| Tipo: Text |
Palavras-chave: Apical structure complex; Cyst; Dinoflagellate; Lepidodinium; Nuclear chambers; Pigment; Pyrenoid; Ultrastructure. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00454/56610/58307.pdf |
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| Shaked, Yonathan; De Vargas, Colomban. |
| We present large subunit (LSU) and internal transcribed spacer (ITS) rDNA based phylogenies of symbiotic dinoflagellates retrieved from single-cell planktonic foraminifera collected around the world. All modern foraminiferal species involved in such symbiosis are included in our analyses. The pelagic symbiotic dinoflagellates form a monophyletic group sister to the Symbiodinium species complex found in coastal-benthic environments. The pelagic symbionts are descendants of free-living species and, together with the coastal-benthic Symbiodinium spp., they originated from the early Mesozoic suessiacean family represented by the extant Polarella glacialis. Out of hundreds of single planktonic foraminifera examined, 21 unique pelagic symbiont ribotypes were... |
| Tipo: Text |
Palavras-chave: Symbiosis; Planktonic foraminifer; Dinoflagellate; Open ocean; Suessiales. |
| Ano: 2006 |
URL: https://archimer.ifremer.fr/doc/00383/49440/49907.pdf |
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| Registros recuperados: 29 | |
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