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You searched for subject:(Gambierdiscus). Showing records 1 – 3 of 3 total matches.

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King Abdullah University of Science and Technology

1. Catania, Daniela. The Prevalence of Benthic Dinoflagellates Associated with Ciguatera in the Central Red Sea.

Degree: Biological and Environmental Sciences and Engineering (BESE) Division, 2012, King Abdullah University of Science and Technology

This study confirms the presence of Gambierdiscus sp., Ostreopsis sp. as well as other epiphytic benthic dinoflagellates associated with Ciguatera Fish Poisoning (CFP) in the Central Red Sea, highlighting the potential occurrence of CFP in this region. These species are reported for the first time in Saudi Arabian coastal waters. A total of 80 Turbinaria and Halimeda macroalgae samples were collected from coral reefs off the Saudi Arabian coast. Sample analyses indicated low average cell abundances (< 40 cells g-1 wet weight algae) of Gambierdiscus sp. and Ostreopsis sp. Subsequent statistical analyses indicated a significant difference in the cell abundances of both genera between sampling sites, between species and between inshore and offshore reefs. The presence of several potentially toxigenic dinoflagellate species in the Red Sea and the statistical differences in abundances between different sampling sites merits future study on possible impacts of these dinoflagellates on marine food webs and human health. Advisors/Committee Members: Berumen, Michael L. (advisor), Anderson, Donald (committee member), Jones, Burton (committee member).

Subjects/Keywords: Gambierdiscus; Ciguatera; Ostreopsis; Red Sea

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Catania, D. (2012). The Prevalence of Benthic Dinoflagellates Associated with Ciguatera in the Central Red Sea. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/262736

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Catania, Daniela. “The Prevalence of Benthic Dinoflagellates Associated with Ciguatera in the Central Red Sea.” 2012. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/262736.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Catania, Daniela. “The Prevalence of Benthic Dinoflagellates Associated with Ciguatera in the Central Red Sea.” 2012. Web. 12 Apr 2021.

Vancouver:

Catania D. The Prevalence of Benthic Dinoflagellates Associated with Ciguatera in the Central Red Sea. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2012. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/262736.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Catania D. The Prevalence of Benthic Dinoflagellates Associated with Ciguatera in the Central Red Sea. [Thesis]. King Abdullah University of Science and Technology; 2012. Available from: http://hdl.handle.net/10754/262736

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

2. Boisnoir, Aurélie. Les dinoflagellés benthiques thoxiques de Guadeloupe et Martinique : distribution et rôle trophique pour la méiofaune : Benthic dinoflagellates in Guadeloupe and Martinique : distribution and trophic role for meiofauna.

Degree: Docteur es, Physiologie et biologie des organismes - populations - interactions, 2018, Antilles

De la profondeursur 2 sites en Guadeloupe pendant la saison sèche et la saison humide (Chapitre 3). A u cours de cette étude,les genres Ostreopsis et Prorocentrum étaient les plus abondants. Aucune influence de la profondeur n'a é;étrouvée sur l'abondance totale des dinoflagellés benthiques ; cependant les genres Ostreopsis et GambiericLscusétaient principalement abondants en surface, alors que le genre Coolia était présent plus en profondeur.L'approche d'écologie trophique concernait le lien trophique entre dinoflagellés benthiques toxiqueset méiofaune (Chapitre 1). Les transferts au sein des réseaux trophiques de phycotoxines synthétisées par lesdinoflagellés benthiques toxiques sont généralement étudiés chez les organismes de grande taille, délaissantles organismes de μeLile Laille qui sulll pourtant en contact direct avec les microalgues. Au cours de cetteétude, une attention particulière a été portée aux copépodes harpacticoïdes qui composent ia méiofaune.Cette étude expérimentale, par marquage des microalgues aux isotopes stables, s'est focalisée sur lescopépodes harpacticoïdes et a permis de mesurer le taux d'ingestion d'Amphidinium sp. et d'Ostreopsis sp ..Cette étude démontre que les organismes de la méiofaune peuvent constituer une voie d'entrée des toxinessynthétisées par les dinoflagellés benthiques dans les réseaux trophiques.

The distribution of benthic toxiï rlinofüeefü1tes is 1111known in (Juadeloupe and Martinique even if at theCaribbean basin spatial scale, those microalgae are responsible for serious poisoning such as ciguatera.During this thesis, the ecology of benthic toxic dinoflagellates μreseul was sLudieJ using: spatio-temporalstudies (Chapters 1, 2, 3) and a trophic ecology approach (Chapter 4).First, 27 sites were explored to describe the spatial distribution of benthic dinoflagellatf's prPsf'nt inGuadeloupe and Martinique (Chapter 1). Only the most abundant macrophytes (biological substrates ofbenthic dinoflagellates) at the different sites were considered. ln this study, 161 samples were analyzed and 7times more taxie benthic dinoflagellates were found in Guadeloupe than in Martinique. The genus Ostreopsisdominated the benthic dinoflagellate community in both islands, although this trend has only rarely beenfound in the Caribbean basin.Then, 3 sites per department were chosen in order to set up a monthly monitoring of benthicdinoflagellates abundances duringl8 months (Chapter 2). The sites selected i) had a high abundance ofbenthic toxic dinoflagellates and ii) were identified as potentially dangerous by the Agence Régionale de laSanté. During this study, 927 samples of macrophytes were analyzed and 5 times more benthic toxicdinoflagellates were found in Guadeloupe than in Martinique. Ostreopsis and Prorocentrum genera dominatedrespectively in Guadeloupe and in Martinique. Two times more Gambierdiscus were found in Martinique thanin Guadeloupe even if Guadeloupe is located in the high prevalence area and this genus being responsible forciguatera. This result suggested that species with…

Advisors/Committee Members: Lemée, Rodolphe (thesis director), Pascal, Pierre-Yves (thesis director).

Subjects/Keywords: Dinoflagellés benthiques; Mer des Caraïbes; Antilles françaises; Gambierdiscus; Ostreopsis; Prorocentrum; Halophila stipulacea; Méiofaune; Benthic dinoflagellates; Caribbean Sea; French West Indies; Gambierdiscus; Ostreopsis; Prorocentrum; Halophi/a stipu/acea; Meiofauna; 570

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Boisnoir, A. (2018). Les dinoflagellés benthiques thoxiques de Guadeloupe et Martinique : distribution et rôle trophique pour la méiofaune : Benthic dinoflagellates in Guadeloupe and Martinique : distribution and trophic role for meiofauna. (Doctoral Dissertation). Antilles. Retrieved from http://www.theses.fr/2018ANTI0246

Chicago Manual of Style (16th Edition):

Boisnoir, Aurélie. “Les dinoflagellés benthiques thoxiques de Guadeloupe et Martinique : distribution et rôle trophique pour la méiofaune : Benthic dinoflagellates in Guadeloupe and Martinique : distribution and trophic role for meiofauna.” 2018. Doctoral Dissertation, Antilles. Accessed April 12, 2021. http://www.theses.fr/2018ANTI0246.

MLA Handbook (7th Edition):

Boisnoir, Aurélie. “Les dinoflagellés benthiques thoxiques de Guadeloupe et Martinique : distribution et rôle trophique pour la méiofaune : Benthic dinoflagellates in Guadeloupe and Martinique : distribution and trophic role for meiofauna.” 2018. Web. 12 Apr 2021.

Vancouver:

Boisnoir A. Les dinoflagellés benthiques thoxiques de Guadeloupe et Martinique : distribution et rôle trophique pour la méiofaune : Benthic dinoflagellates in Guadeloupe and Martinique : distribution and trophic role for meiofauna. [Internet] [Doctoral dissertation]. Antilles; 2018. [cited 2021 Apr 12]. Available from: http://www.theses.fr/2018ANTI0246.

Council of Science Editors:

Boisnoir A. Les dinoflagellés benthiques thoxiques de Guadeloupe et Martinique : distribution et rôle trophique pour la méiofaune : Benthic dinoflagellates in Guadeloupe and Martinique : distribution and trophic role for meiofauna. [Doctoral Dissertation]. Antilles; 2018. Available from: http://www.theses.fr/2018ANTI0246


University of New South Wales

3. Kohli, Gurjeet Singh. Diversity and genetics of Australasian dinoflagellates, including Gambierdiscus spp. the causative agent of Ciguatera Fish Poisoning.

Degree: Biotechnology & Biomolecular Sciences, 2013, University of New South Wales

Marine microbial protists from benthic habitats include species of the genera Gambierdiscus, which can produce polyketide toxins with ecosystem-wide impacts and impacts on human health. Knowledge of the presence, diversity, effects and distribution of benthic dinoflagellates and their toxins is vital both for basic ecological research and for managing potential impacts on human health. However, at present such information is limited. This study designed novel pyrosequencing-based tools that utilised 18S rRNA and mitochondrial cytochrome b barcoding marker genes. Using these tools, the largest set of dinoflagellate cytochrome b gene sequences to date was developed, and dinoflagellate species richness within marine benthic samples from five tropical marine benthic sites were determined. These tools were applied to samples from a temperate marine benthic site from southern NSW and the species Gambierdiscus carpenteri was found to be highly abundant throughout the region. This was unexpected, given that it is primarily considered a tropical species. The significance of finding this species is discussed in the context of long term monitoring data and its potential for toxin production.Species of Gambierdiscus produce two major toxin groups, ciguatoxins (CTXs) and maitotoxins (MTXs), that can accumulate via marine food chains in seafood and ultimately cause ciguatera fish poisoning (CFP) in humans. While the role of CTXs is well established in CFP, little is known about the role of MTXs. This work showed experimentally that MTXs can accumulate in liver and muscle tissues of carnivorous fish (Pagrus auratus). The levels of MTX detected in fish tissues showed for the first time that MTX may accumulate in fish at levels harmful for human consumption. In order to investigate the genetic basis of toxin biosynthesis in species of Gambierdiscus, two comprehensive transcriptomic libraries for the species Gambierdiscus australes and Gambierdiscus belizeanus, which produce MTXs were sequenced and assembled. Data analysis discovered three hundred and seven genes that formed eight clades within a phylogeny of dinoflagellate polyketide synthesis genes, and may be involved in MTX biosynthesis. This is the first step towards identifying prospective genes that may be involved in MTX biosynthesis, and provides a basis for the future development of molecular tools to assess the risk of CFP. Advisors/Committee Members: Neilan, Brett, Biotechnology & Biomolecular Sciences, Faculty of Science, UNSW, Murray, Shauna, Biotechnology & Biomolecular Sciences, Faculty of Science, UNSW.

Subjects/Keywords: Ciguatera fish poisoning; Dinoflagellate; Gambierdiscus; Maitotoxin; Toxin biosynthesis; Transcriptomic analysis; Polyketide synthase; Pyrosequencing

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Kohli, G. S. (2013). Diversity and genetics of Australasian dinoflagellates, including Gambierdiscus spp. the causative agent of Ciguatera Fish Poisoning. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/53428 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12123/SOURCE02?view=true

Chicago Manual of Style (16th Edition):

Kohli, Gurjeet Singh. “Diversity and genetics of Australasian dinoflagellates, including Gambierdiscus spp. the causative agent of Ciguatera Fish Poisoning.” 2013. Doctoral Dissertation, University of New South Wales. Accessed April 12, 2021. http://handle.unsw.edu.au/1959.4/53428 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12123/SOURCE02?view=true.

MLA Handbook (7th Edition):

Kohli, Gurjeet Singh. “Diversity and genetics of Australasian dinoflagellates, including Gambierdiscus spp. the causative agent of Ciguatera Fish Poisoning.” 2013. Web. 12 Apr 2021.

Vancouver:

Kohli GS. Diversity and genetics of Australasian dinoflagellates, including Gambierdiscus spp. the causative agent of Ciguatera Fish Poisoning. [Internet] [Doctoral dissertation]. University of New South Wales; 2013. [cited 2021 Apr 12]. Available from: http://handle.unsw.edu.au/1959.4/53428 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12123/SOURCE02?view=true.

Council of Science Editors:

Kohli GS. Diversity and genetics of Australasian dinoflagellates, including Gambierdiscus spp. the causative agent of Ciguatera Fish Poisoning. [Doctoral Dissertation]. University of New South Wales; 2013. Available from: http://handle.unsw.edu.au/1959.4/53428 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12123/SOURCE02?view=true

.