Consulta: subjectFacets:"Symbiodinium"
Registros recuperados: 5
Data/hora: 17/06/2024 00:46:41

Implication of the host TGF beta pathway in the onset of symbiosis between larvae of the coral Fungia scutaria and the dinoflagellate Symbiodinium sp (clade C1f)
Provedor de dados: 5
Autores: Berthelier, Jeremy; Schnitzler, Christine E.; Wood-charlson, Elisha M.; Poole, Angela Z.; Weis, Virginia M.; Detournay, Olivier.
Dinoflagellate-cnidarian associations form both the trophic and structural foundation of coral-reef ecosystems. Previous studies have highlighted the role of host innate immunity in regulation of these partnerships. This study reveals the presence of a transforming growth factor beta (TGF beta) in the coral Fungia scutaria that clusters with TGF beta sensu stricto (ss) from other animals. In functional studies of F. scutaria larvae, we show that (1) TGF beta ss mRNA is expressed during early stages of development prior to the onset of symbiosis; (2) apparent interference of the TGF beta pathway impairs the onset of symbiosis; and (3) this effect is associated with an increase of cytotoxic nitric oxide secretion, an immune response. This work highlights the...
Tipo: Text
Palavras-chave: Transforming growth factor beta; Cnidarian; Coral bleaching; Dinoflagellate; Symbiodinium; Symbiosis.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00412/52389/56297.pdf

Trophic dynamics of scleractinian corals: stable isotope evidence
Provedor de dados: 5
Autores: Tremblay, Pascale; Maguer, Jean-francois; Grover, Renaud; Ferrier-pages, Christine.
Reef-building corals form symbioses with dinoflagellates from the diverse genus Symbiodinium. This symbiotic association has developed adaptations to acquire and share nutrients, which are essential for its survival and growth in nutrient-poor tropical waters. The host is thus able to prey on a wide range of organic food sources (heterotrophic nutrition) whereas the symbionts acquire most of the inorganic nutrients (autotrophic nutrition). However, nutrient fluxes between the two partners remain unclear, especially concerning heterotrophically acquired carbon and nitrogen. We combined physiological measurements and pulse-chase isotopic labeling of heterotrophic carbon and nitrogen, as well as autotrophic carbon to track nutrient fluxes in two coral...
Tipo: Text
Palavras-chave: Autotrophy; Carbon; Heterotrophy; Irradiance; Isotopic labeling; Nitrogen; Stylophora pistillata; Symbiodinium; Symbiosis; Turbinaria reniformis.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00270/38145/73160.pdf

An updated assessment of     Symbiodinium     spp. that associate with common scleractinian corals from Moorea (French Polynesia) reveals high diversity among background symbionts and a novel finding of clade B
Provedor de dados: 5
Autores: Rouze, Heloise; Lecellier, Gael J.; Saulnier, Denis; Planes, Serge; Gueguen, Yannick; Wirshing, Herman H.; Berteaux-lecellier, Veronique.
The adaptative bleaching hypothesis (ABH) states that, depending on the symbiotic flexibility of coral hosts (i.e., the ability of corals to “switch” or “shuffle” their algal symbionts), coral bleaching can lead to a change in the composition of their associated Symbiodinium community and, thus, contribute to the coral’s overall survival. In order to determine the flexibility of corals, molecular tools are required to provide accurate species delineations and to detect low levels of coral-associated Symbiodinium. Here, we used highly sensitive quantitative (real-time) PCR (qPCR) technology to analyse five common coral species from Moorea (French Polynesia), previously screened using only traditional molecular methods, to assess the presence of...
Tipo: Text
Palavras-chave: Corals; French polynesia; Clade B; Symbiodinium; QPCR; Flexibility; Generalist; Faithful clade.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00365/47652/47683.pdf

Changes in fatty acid composition in the giant clam Tridacna maxima in response to thermal stress
Provedor de dados: 5
Autores: Dubousquet, Vaimiti; Gros, Emmanuelle; Berteaux-lecellier, Veronique; Viguier, Bruno; Raharivelomanana, Phila; Bertrand, Cédric; Lecellier, Gael J.
Temperature can modify membrane fluidity and thus affects cellular functions and physiological activities. This study examines lipid remodelling in the marine symbiotic organism, Tridacna maxima, during a time series of induced thermal stress, with an emphasis on the morphology of their symbiont Symbiodinium. First, we show that the French Polynesian giant clams harbour an important proportion of saturated fatty acids (SFA), which reflects their tropical location. Second, in contrast to most marine organisms, the total lipid content in giant clams remained constant under stress, though some changes in their composition were shown. Third, the stress-induced changes in fatty acid (FA) diversity were accompanied by an upregulation of genes involved in lipids...
Tipo: Text
Palavras-chave: Thermal stress; Fatty acids; Differential expression; Antioxidant; Symbiodinium; Tridacna maxima.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00361/47195/79514.pdf

Zoanthids of the Cape Verde Islands and their symbionts: previously unexamined diversity in the Northeastern Atlantic
Provedor de dados: 16
Autores: Reimer, J.D.; Hirose, M.; Wirtz, P.
The marine invertebrate fauna of the Cape Verde Islands contains many endemic species due to their isolated location in the eastern Atlantic, yet research has not been conducted on most taxa here. One such group are the zoanthids or mat anemones, an order of benthic cnidarians (Hexacorallia: Zoantharia) common in many marine environments. In this study, the diversity of zoanthids in the Cape Verde Islands is specifically examined for the first time. Field images and sampling are combined with molecular phylogenetic analyses utilizing two mitochondrial DNA markers (cytochrome oxidase subunit I and 16S ribosomal DNA) to determine the number of species present. Specimens from eight species (Palythoa caribaeorum, Palythoa sp. 265, Zoanthus aff. pulchellus,...
Tipo: Article / Letter to the editor
Palavras-chave: Cape Verde Islands; Cnidaria; Symbiodinium; Undescribed species; Zoanthid; 42.72.
Ano: 2010
URL: http://www.repository.naturalis.nl/record/360112