Resultados totales (Incluyendo duplicados): 33514
Encontrada(s) 3352 página(s)
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321404
Sound. 2021

DRIVERS OF DINOFLAGELLATE BENTHIC CYST ASSEMBLAGES IN THE NW PATAGONIAN FJORDS SYSTEM AND ITS ADJACENT OCEANIC SHELF, WITH A FOCUS ON HARMFUL SPECIES

  • Rodríguez-Villegas, Camilo
  • Lee, Matthew, R.
  • Salgado, Pablo
  • Figueroa, Rosa Isabel
  • Baldrich, Ángela
  • Pérez-Santos, Ivan
  • Tomasetti, Stephen J.
  • Álvarez, Gonzalo
  • Marín, Sandra, L.
  • Seguel, Miriam
  • Farías, Laura
  • Díaz, Patricio Andrés

Proyecto: //
DOI: http://hdl.handle.net/10508/12101, http://hdl.handle.net/10261/321404
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321404
HANDLE: http://hdl.handle.net/10508/12101, http://hdl.handle.net/10261/321404
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321404
PMID: http://hdl.handle.net/10508/12101, http://hdl.handle.net/10261/321404
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321404
Ver en: http://hdl.handle.net/10508/12101, http://hdl.handle.net/10261/321404
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321404

Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321560
Sound. 2016

FIRST APPROACH TO STUDY THE SIZE AND MORPHOLOGY OF GORGONIAN CORALS AND SPONGES USING PHOTOGRAMMETRIC ANALYSIS FROM VIDEO TRANSECTS IN THE MARINE PROTECTED AREA ‘EL CACHUCHO’ (CANTABRIAN SEA)

  • Prado, Elena
  • Sánchez, Francisco
  • Rodríguez, Augusto
The use of non-invasive methodology, which does not cause damage or alterations on benthic communities, is particularly necessary in vulnerable ecosystem studies and Marine Protected Areas (MPA) monitoring. The European directives on protection and the OSPAR Commission described the habitats structured by sessile species of great size, such as corals or sponges, as particularly vulnerable habitats requiring special protection. The knowledge of population structures as indicators of their state of health is a requirement to improve the management programs. The presence of gorgonian forests and deep-sea sponge aggregations in the Le Danois Bank was the cause of it declaration by the Ministry of the Environment as "El Cachucho” MPA, being included in the Natura 2000 network. Currently being performed follow-up surveys to know their conservation status. This study presents methodology and first results obtained in the analysis of the video transects acquired in ‘El Cachucho’ MPA, during the ESMAREC survey using the ROTV Politolana underwater towed vehicle. Video was recorded to pilot the ROTV, so characteristics of video camera were not specifically designed for monitoring the habitats. But recent developments in specific software of photogrammetric image analysis have allowed extracting valuable information of these video transects. The outputs of the photogrammetric approach include products such as geo-referenced orthomosaic, Digital Surface Model (DSM) and point cloud (XYZ). These data show the possibility to evaluate the size and morphology (including 3D analysis) of the vulnerable species in the area, as the gorgonians Paramuricea placomus and Callogorgia verticillata and the sponges Asconema setubalense and Geodia megastrella. The non-invasive growth rate studies need a set of measurement, fan height, fan width, and others. This methodology will make easier future studies about age and rate of growth of these species and population structure in the zone.

Proyecto: //
DOI: http://hdl.handle.net/10508/10342, http://hdl.handle.net/10261/321560
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321560
HANDLE: http://hdl.handle.net/10508/10342, http://hdl.handle.net/10261/321560
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321560
PMID: http://hdl.handle.net/10508/10342, http://hdl.handle.net/10261/321560
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321560
Ver en: http://hdl.handle.net/10508/10342, http://hdl.handle.net/10261/321560
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321560

Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321612
Sound. 2017

MAITOTOXIN-4, A NOVEL MTX ANALOG PRODUCED BY GAMBIERDISCUS EXCENTRICUS

  • Pisapia, Francesco
  • Sibat, Manoëlla
  • Herrenknecht, Christine
  • Lhaute, Korian
  • Gaiani, Greta
  • Ferron, Pierre-Jean
  • Fessard, Valérie
  • Fraga, Santiago
  • Nascimento, Silvia Mattos
  • Litaker, Wayne
  • Holland, W.C.
  • Roullier, Catherine
  • Hess, Philipp
Maitotoxins (MTXs) are among the most potent toxins known. These toxins are produced by epi-benthic dinoflagellates of the genera Gambierdiscus and Fukuyoa and may play a role in causing the symptoms associated with Ciguatera Fish Poisoning. A recent survey revealed that, of the species tested, the newly described species from the Canary Islands, G. excentricus, is one of the most maitotoxic. The goal of the present study was to characterize MTX-related compounds produced by this species. Initially, lysates of cells from two Canary Island G. excentricus strains VGO791 and VGO792 were partially purified by (i) liquid-liquid partitioning between dichloromethane and aqueous methanol followed by (ii) size-exclusion chromatography. Fractions from chromatographic separation were screened for MTX toxicity using both the neuroblastoma neuro-2a (N2a) cytotoxicity and Ca2+ flux functional assays. Fractions containing MTX activity were analyzed using liquid chromatography coupled to high-resolution mass spectrometry (LC-HRMS) to pinpoint potential MTX analogs. Subsequent non-targeted HRMS analysis permitted the identification of a novel MTX analog, maitotoxin-4 (MTX4, accurate mono-isotopic mass of 3292.4860 Da, as free acid form) in the most toxic fractions. HRMS/MS spectra of MTX4 as well as of MTX are presented. In addition, crude methanolic extracts of five other strains of G. excentricus and 37 other strains representing one Fukuyoa species and ten species, one ribotype and one undetermined strain/species of Gambierdiscus were screened for the presence of MTXs using low resolution tandem mass spectrometry (LRMS/MS). This targeted analysis indicated the original maitotoxin (MTX) was only present in one strain (G. australes S080911_1). Putative maitotoxin-2 (p-MTX2) and maitotoxin-3 (p-MTX3) were identified in several other species, but confirmation was not possible because of the lack of reference material. Maitotoxin-4 was detected in all seven strains of G. excentricus examined, independently of their origin (Brazil, Canary Islands and Caribbean), and not detected in any other species. MTX4 may therefore serve as a biomarker for the highly toxic G. excentricus in the Atlantic area.

Proyecto: //
DOI: http://hdl.handle.net/10508/11307, http://hdl.handle.net/10261/321612
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321612
HANDLE: http://hdl.handle.net/10508/11307, http://hdl.handle.net/10261/321612
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321612
PMID: http://hdl.handle.net/10508/11307, http://hdl.handle.net/10261/321612
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321612
Ver en: http://hdl.handle.net/10508/11307, http://hdl.handle.net/10261/321612
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321612

Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321795
Sound. 2021

CYTOLOGICAL EVIDENCE OF SEX IN THE DINOFLAELLATE ENDOSYMBIONTS (FAMILY SYMBIODINIACEAE) OF CORALS

  • Figueroa, Rosa Isabel
  • Howe-Kerr, Lauren I.
  • Correa, Adrianne M.S.
Presentación oral en el congreso internacional: 14th INTERNATIONAL CORAL REEF SYMPOSIUM, celebrado en Bremen (Alemania) del 19-23 de julio de 2021 (ICRS2021), DETECCIÓN INNOVADORA DE PROLIFERACIONES ALGALES TÓXICAS: UNA NECESIDAD FRENTE AL CALENTAMIENTO GLOBAL, DIANAS

Proyecto: //
DOI: http://hdl.handle.net/10508/12125, http://hdl.handle.net/10261/321795
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321795
HANDLE: http://hdl.handle.net/10508/12125, http://hdl.handle.net/10261/321795
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321795
PMID: http://hdl.handle.net/10508/12125, http://hdl.handle.net/10261/321795
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321795
Ver en: http://hdl.handle.net/10508/12125, http://hdl.handle.net/10261/321795
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321795

Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321893
Sound. 2021

CHANGES IN DISTRIBUTION OF PHYTOPLANKTON FUNCTIONAL GROUPS DISTRIBUTION, PIGMENT COMPOSITION AND THE REALIZED NICHE OF DINOPHYSIS ACUMINATA AT THE ONSET OF AN UPWELLING EVENT

  • Velasco-Senovilla, E (Esther)
  • Díaz, Patricio Andrés
  • Rodríguez, Francisco
  • Garrido, José LuisL
  • Ruiz-Villarreal, Manuel
  • Fernández-Pena, Concepción
  • Mouriño-Carballido, Beatriz
  • Reguera, Beatriz
  • Nogueira, Enrique
Dinophysis acuminata is the major cause of lengthy harvesting bans in shellfish growing areas in European Atlantic waters. In North Western Iberian shelf waters, the growing season of D. acuminata lasts throughout the upwelling season (ca. from March to September). Once environmental conditions trigger initial population growth, abundance fluctuations are coupled to the event-scale dynamics of coastal upwelling-relaxation/downwelling cycles. The “ASIMUTH-Rias” cruise (17–21 June 2013) in the Galician Rias (Pontevedra and Vigo) and adjacent shelf, during a DSP outbreak, aimed to explore small-scale physical processes associated with late spring blooms (> 103 cells L-1) of D. acuminata. The cruise coincided with the initiation of an upwelling pulse following relaxation and deepening of a previously formed thin layer of centric colony-forming diatoms. In this work, a niche (sensu Hutchinson) approach based on an Outlying Mean Index (OMI) analysis was used to describe the realized niche of D. acuminata during transient conditions. The OMI analysis was applied to fine-scale measurements of physical properties, HPLC-derived pigment composition, and phytoplankton functional groups in cross-shelf transects and in a 36-h study at a fixed station. Although having a wide niche breath, the realized niche of D. acuminata (cell maximum 5 ×103 cells L-1 between 3 and 5 m) was characterized by outflowing warmer (15-16 °C) waters with high turbulence (? < 10-6 m2 s-3), high light intensity, and low nitrate concentrations. These results show that during a transient upwelling-initiation scenario, mid-shelf waters provided a more suitable habitat for D. acuminata and the accompanying dinoflagellate populations than waters inside the rías

Proyecto: //
DOI: http://hdl.handle.net/10508/16047, http://hdl.handle.net/10261/321893
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321893
HANDLE: http://hdl.handle.net/10508/16047, http://hdl.handle.net/10261/321893
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321893
PMID: http://hdl.handle.net/10508/16047, http://hdl.handle.net/10261/321893
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321893
Ver en: http://hdl.handle.net/10508/16047, http://hdl.handle.net/10261/321893
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/321893

Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/323100
Sound. 30

STOCK ASSESSMENT FORM DEMERSAL SPECIES, PARAPENAEUS LONGIROSTRIS FROM GSA5 (BALEARIC ISLANDS) 2022

  • Farré, M (Marc)
  • Guijarro, Beatriz
  • González-Fernández, Natalia Divina
  • Soldán, V.

Proyecto: //
DOI: http://hdl.handle.net/10508/16218, http://hdl.handle.net/10261/323100
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/323100
HANDLE: http://hdl.handle.net/10508/16218, http://hdl.handle.net/10261/323100
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/323100
PMID: http://hdl.handle.net/10508/16218, http://hdl.handle.net/10261/323100
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/323100
Ver en: http://hdl.handle.net/10508/16218, http://hdl.handle.net/10261/323100
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/323100

Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/323270
Sound. 2021

DRIVERS OF DINOFLAGELLATE BENTHIC CYST ASSEMBLAGES IN THE NW PATAGONIAN FJORDS SYSTEM AND ITS ADJACENT OCEANIC SHELF, WITH A FOCUS ON HARMFUL SPECIES

  • Rodríguez-Villegas, Camilo
  • Lee, Matthew, R.
  • Salgado, Pablo
  • Figueroa, Rosa Isabel
  • Baldrich, Ángela
  • Pérez-Santos, Ivan
  • Tomasetti, Stephen J.
  • Álvarez, Gonzalo
  • Marín, Sandra, L.
  • Seguel, Miriam
  • Farías, Laura
  • Díaz, Patricio Andrés

Proyecto: //
DOI: http://hdl.handle.net/10508/12101, http://hdl.handle.net/10261/323270
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/323270
HANDLE: http://hdl.handle.net/10508/12101, http://hdl.handle.net/10261/323270
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/323270
PMID: http://hdl.handle.net/10508/12101, http://hdl.handle.net/10261/323270
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/323270
Ver en: http://hdl.handle.net/10508/12101, http://hdl.handle.net/10261/323270
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/323270

Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/323438
Sound. 2017

MAITOTOXIN-4, A NOVEL MTX ANALOG PRODUCED BY GAMBIERDISCUS EXCENTRICUS

  • Pisapia, Francesco
  • Sibat, Manoëlla
  • Herrenknecht, Christine
  • Lhaute, Korian
  • Gaiani, Greta
  • Ferron, Pierre-Jean
  • Fessard, Valérie
  • Fraga, Santiago
  • Nascimento, Silvia Mattos
  • Litaker, Wayne
  • Holland, W.C.
  • Roullier, Catherine
  • Hess, Philipp
Maitotoxins (MTXs) are among the most potent toxins known. These toxins are produced by epi-benthic dinoflagellates of the genera Gambierdiscus and Fukuyoa and may play a role in causing the symptoms associated with Ciguatera Fish Poisoning. A recent survey revealed that, of the species tested, the newly described species from the Canary Islands, G. excentricus, is one of the most maitotoxic. The goal of the present study was to characterize MTX-related compounds produced by this species. Initially, lysates of cells from two Canary Island G. excentricus strains VGO791 and VGO792 were partially purified by (i) liquid-liquid partitioning between dichloromethane and aqueous methanol followed by (ii) size-exclusion chromatography. Fractions from chromatographic separation were screened for MTX toxicity using both the neuroblastoma neuro-2a (N2a) cytotoxicity and Ca2+ flux functional assays. Fractions containing MTX activity were analyzed using liquid chromatography coupled to high-resolution mass spectrometry (LC-HRMS) to pinpoint potential MTX analogs. Subsequent non-targeted HRMS analysis permitted the identification of a novel MTX analog, maitotoxin-4 (MTX4, accurate mono-isotopic mass of 3292.4860 Da, as free acid form) in the most toxic fractions. HRMS/MS spectra of MTX4 as well as of MTX are presented. In addition, crude methanolic extracts of five other strains of G. excentricus and 37 other strains representing one Fukuyoa species and ten species, one ribotype and one undetermined strain/species of Gambierdiscus were screened for the presence of MTXs using low resolution tandem mass spectrometry (LRMS/MS). This targeted analysis indicated the original maitotoxin (MTX) was only present in one strain (G. australes S080911_1). Putative maitotoxin-2 (p-MTX2) and maitotoxin-3 (p-MTX3) were identified in several other species, but confirmation was not possible because of the lack of reference material. Maitotoxin-4 was detected in all seven strains of G. excentricus examined, independently of their origin (Brazil, Canary Islands and Caribbean), and not detected in any other species. MTX4 may therefore serve as a biomarker for the highly toxic G. excentricus in the Atlantic area.

Proyecto: //
DOI: http://hdl.handle.net/10508/11307, http://hdl.handle.net/10261/323438
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/323438
HANDLE: http://hdl.handle.net/10508/11307, http://hdl.handle.net/10261/323438
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/323438
PMID: http://hdl.handle.net/10508/11307, http://hdl.handle.net/10261/323438
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/323438
Ver en: http://hdl.handle.net/10508/11307, http://hdl.handle.net/10261/323438
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/323438

Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/323736
Sound. 2021

CYTOLOGICAL EVIDENCE OF SEX IN THE DINOFLAELLATE ENDOSYMBIONTS (FAMILY SYMBIODINIACEAE) OF CORALS

  • Figueroa, Rosa Isabel
  • Howe-Kerr, Lauren I.
  • Correa, Adrianne M.S.
Presentación oral en el congreso internacional: 14th INTERNATIONAL CORAL REEF SYMPOSIUM, celebrado en Bremen (Alemania) del 19-23 de julio de 2021 (ICRS2021), DETECCIÓN INNOVADORA DE PROLIFERACIONES ALGALES TÓXICAS: UNA NECESIDAD FRENTE AL CALENTAMIENTO GLOBAL, DIANAS

Proyecto: //
DOI: http://hdl.handle.net/10508/12125, http://hdl.handle.net/10261/323736
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/323736
HANDLE: http://hdl.handle.net/10508/12125, http://hdl.handle.net/10261/323736
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/323736
PMID: http://hdl.handle.net/10508/12125, http://hdl.handle.net/10261/323736
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/323736
Ver en: http://hdl.handle.net/10508/12125, http://hdl.handle.net/10261/323736
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/323736

Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/324823
Sound. 2017

ESPAÑOLES EN LA MAR - MAR DEL NORTE - 20/02/17 20 FEB 2017

  • Llope, Marcos
El Mar del Norte alberga importantes bancos de pesca. Es un ecosistema diverso en el que se producen complejas interacciones en la cadena trófica que han sido objeto de estudio por un grupo de científicos de distintos países entre los que se encuentra Marcos Llope, del Instituto Español de Oceanografía. Con él hablamos en nuestro viaje de hoy.

Proyecto: //
DOI: http://hdl.handle.net/10508/10799, http://hdl.handle.net/10261/324823
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/324823
HANDLE: http://hdl.handle.net/10508/10799, http://hdl.handle.net/10261/324823
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/324823
PMID: http://hdl.handle.net/10508/10799, http://hdl.handle.net/10261/324823
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/324823
Ver en: http://hdl.handle.net/10508/10799, http://hdl.handle.net/10261/324823
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/324823

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