Consulta: creatorFacets:"Adjeroud, Mehdi"
Registros recuperados: 10
Data/hora: 19/05/2024 11:53:12

Genetic connectivity of the coral-eating sea star Acanthaster planci during the severe outbreak of 2006-2009 in the Society Islands, French Polynesia
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Yasuda, Nina; Taquet, Coralie; Nagai, Satoshi; Yoshida, Terutoyo; Adjeroud, Mehdi.
Occasional population outbreaks of the crown-of-thorns sea star, Acanthaster planci, are a major threat to coral reefs across the Indo-Pacific. The presumed association between the serial nature of these outbreaks and the long larval dispersal phase makes it important to estimate larval dispersal; many studies have examined the population genetic structure of A.planci for this purpose using different genetic markers. However, only a few have focused on reef-scale as well as archipelago-scale genetic structure and none has used a combination of different genetic markers with different effective population sizes. In our study, we used both mtDNA and microsatellite loci to examine A.planci population genetic structure at multiple spatial scales (from &lt;2km...
Tipo: Text
Palavras-chave: Acanthaster planci; Coral reefs; Microsatellite loci; MtDNA; Population genetic structure.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00667/77936/80151.pdf

Genetic diversity, clonality and connectivity in the scleractinian coral Pocillopora damicornis: a multi-scale analysis in an insular, fragmented reef system
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Adjeroud, Mehdi; Guerecheau, Aurelie; Vidal-dupiol, Jeremie; Flot, Jean-francois; Arnaud-haond, Sophie; Bonhomme, Francois.
Clonality and genetic structure of the coral Pocillopora damicornis sensu lato were assessed using five microsatellites in 12 populations from four islands of the Society Archipelago (French Polynesia) sampled in June 2008. The 427 analysed specimens fell into 132 multilocus genotypes (MLGs), suggesting that asexual reproduction plays an important role in the maintenance of these populations. A haploweb analysis of ITS2 sequences of each MLG was consistent with all of them being conspecific. Genetic differentiation was detected both between and within islands, but when a single sample per MLG was included in the analyses, the populations turned out to be nearly panmictic. These observations provide further evidence of the marked variability in reproductive...
Tipo: Text
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00171/28209/26518.pdf

Innate Immune Responses of a Scleractinian Coral to Vibriosis
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Vidal-dupiol, Jeremie; Ladriere, Ophelie; Destoumieux-garzon, Delphine; Sautiere, Pierre-eric; Meistertzheim, Anne-leila; Tambutte, Eric; Tambutte, Sylvie; Duval, David; Foure, Laurent; Adjeroud, Mehdi; Mitta, Guillaume.
Scleractinian corals are the most basal eumetazoan taxon and provide the biological and physical framework for coral reefs, which are among the most diverse of all ecosystems. Over the past three decades and coincident with climate change, these phototrophic symbiotic organisms have been subject to increasingly frequent and severe diseases, which are now geographically widespread and a major threat to these ecosystems. Although coral immunity has been the subject of increasing study, the available information remains fragmentary, especially with respect to coral antimicrobial responses. In this study, we characterized damicornin from Pocillopora damicornis, the first scleractinian antimicrobial peptide (AMP) to be reported. We found that its precursor has...
Tipo: Text
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00039/14996/12433.pdf

Juvenile corals underpin coral reef carbonate production after disturbance
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Carlot, Jérémy; Kayal, Mohsen; Lenihan, Hunter S.; Brandl, Simon J.; Casey, Jordan M.; Adjeroud, Mehdi; Cardini, Ulisse; Merciere, Alexandre; Espiau, Benoit; Barneche, Diego R.; Rovere, Alessio; Hédouin, Laetitia; Parravicini, Valeriano.
Sea‐level rise is predicted to cause major damage to tropical coastlines. While coral reefs can act as natural barriers for ocean waves, their protection hinges on the ability of scleractinian corals to produce enough calcium carbonate (CaCO3) to keep up with rising sea levels. As a consequence of intensifying disturbances, coral communities are changing rapidly, potentially reducing community‐level CaCO3 production. By combining colony‐level physiology and long‐term monitoring data, we show that reefs recovering from major disturbances can produce 40% more CaCO3 than currently estimated due to the disproportionate contribution of juvenile corals. However, the buffering effect of highly productive juvenile corals is compromised by recruitment failures,...
Tipo: Text
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00685/79743/82514.pdf

Protists Within Corals: The Hidden Diversity
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Clerissi, Camille; Brunet, Sebastien; Vidal-dupiol, Jeremie; Adjeroud, Mehdi; Lepage, Pierre; Guillou, Laure; Escoubas, Jean Michel; Toulza, Eve.
Previous observations suggested that microbial communities contribute to coral health and the ecological resilience of coral reefs. However, most studies of coral microbiology focused on prokaryotes and the endosymbiotic algae Symbiodinium. In contrast, knowledge concerning diversity of other protists is still lacking, possibly due to methodological constraints. As most eukaryotic DNA in coral samples was derived from hosts, protist diversity was missed in metagenome analyses. To tackle this issue, we designed blocking primers for Scleractinia sequences amplified with two primer sets that targeted variable loops of the 18S rRNA gene (18SV1V2 and 18SV4). These blocking primers were used on environmental colonies of Pocillopora damicornis sensu lato from two...
Tipo: Text
Palavras-chave: Holobiont; Protists; Symbiosis; Metabarcoding; Blocking primer; Scleractinia; Pocillopora damicornis.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00457/56823/58661.pdf

Quantifying the shelter capacity of coral reefs using photogrammetric 3D modeling: From colonies to reefscapes
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Urbina-barreto, Isabel; Chiroleu, Frédéric; Pinel, Romain; Fréchon, Louis; Mahamadaly, Vincent; Elise, Simon; Kulbicki, Michel; Quod, Jean-pascal; Dutrieux, Eric; Garnier, Rémi; Henrich Bruggemann, J.; Penin, Lucie; Adjeroud, Mehdi.
Structural complexity plays a key role in the functioning of coral reef ecosystems. Reef-building corals are major contributors to this complexity, providing shelter and food for numerous invertebrates and fish species. Both structural complexity and shelter capacity of reefscapes are determined by several components such as spurs and grooves, slope, caves and holes, vegetation and coral colonies. Quantifying the shelter capacity from coral colonies to reefscapes is a fundamental step to estimating ecosystem potential to support biodiversity. Here, we applied underwater photogrammetry to quantify shelter volumes provided by individual coral colonies. Overall, 120 3D models of coral colonies from branching, massive, columnar and tabular growth forms were...
Tipo: Text
Palavras-chave: Coral reefs; Reef-building corals; Photogrammetry; 3D models; Predictive models; Shelter capacity; Structural complexity; Coral growth forms.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00659/77065/78372.pdf

Social–environmental drivers inform strategic management of coral reefs in the Anthropocene
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Darling, Emily S.; Mcclanahan, Tim R.; Maina, Joseph; Gurney, Georgina G.; Graham, Nicholas A. J.; Januchowski-hartley, Fraser; Cinner, Joshua E.; Mora, Camilo; Hicks, Christina C.; Maire, Eva; Puotinen, Marji; Skirving, William J.; Adjeroud, Mehdi; Ahmadia, Gabby; Arthur, Rohan; Bauman, Andrew G.; Beger, Maria; Berumen, Michael L.; Bigot, Lionel; Bouwmeester, Jessica; Brenier, Ambroise; Bridge, Tom C. L.; Brown, Eric; Campbell, Stuart J.; Cannon, Sara; Cauvin, Bruce; Chen, Chaolun Allen; Claudet, Joachim; Denis, Vianney; Donner, Simon; Estradivari,; Fadli, Nur; Feary, David A.; Fenner, Douglas; Fox, Helen; Franklin, Erik C.; Friedlander, Alan; Gilmour, James; Goiran, Claire; Guest, James; Hobbs, Jean-paul A.; Hoey, Andrew S.; Houk, Peter; Johnson, Steven; Jupiter, Stacy D.; Kayal, Mohsen; Kuo, Chao-yang; Lamb, Joleah; Lee, Michelle A. C.; Low, Jeffrey; Muthiga, Nyawira; Muttaqin, Efin; Nand, Yashika; Nash, Kirsty L.; Nedlic, Osamu; Pandolfi, John M.; Pardede, Shinta; Patankar, Vardhan; Penin, Lucie; Ribas-deulofeu, Lauriane; Richards, Zoe; Roberts, T. Edward; Rodgers, Ku’ulei S.; Safuan, Che Din Mohd; Sala, Enric; Shedrawi, George; Sin, Tsai Min; Smallhorn-west, Patrick; Smith, Jennifer E.; Sommer, Brigitte; Steinberg, Peter D.; Sutthacheep, Makamas; Tan, Chun Hong James; Williams, Gareth J.; Wilson, Shaun; Yeemin, Thamasak; Bruno, John F.; Fortin, Marie-josée; Krkosek, Martin; Mouillot, David.
Without drastic efforts to reduce carbon emissions and mitigate globalized stressors, tropical coral reefs are in jeopardy. Strategic conservation and management requires identification of the environmental and socioeconomic factors driving the persistence of scleractinian coral assemblages—the foundation species of coral reef ecosystems. Here, we compiled coral abundance data from 2,584 Indo-Pacific reefs to evaluate the influence of 21 climate, social and environmental drivers on the ecology of reef coral assemblages. Higher abundances of framework-building corals were typically associated with: weaker thermal disturbances and longer intervals for potential recovery; slower human population growth; reduced access by human settlements and markets; and...
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00512/62324/66605.pdf

Thermal regime and host clade, rather than geography, drive Symbiodinium and bacterial assemblages in the scleractinian coral Pocillopora damicornis sensu lato
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Brener-raffalli, Kelly; Clerissi, Camille; Vidal-dupiol, Jeremie; Adjeroud, Mehdi; Bonhomme, Francois; Pratlong, Marine; Aurelle, Didier; Mitta, Guillaume; Toulza, Eve.
Background: Although the term holobiont has been popularized in corals with the advent of the hologenome theory of evolution, the underlying concepts are still a matter of debate. Indeed, the relative contribution of host and environment and especially thermal regime in shaping the microbial communities should be examined carefully to evaluate the potential role of symbionts for holobiont adaptation in the context of global changes. We used the sessile, long-lived, symbiotic and environmentally sensitive reef-building coral Pocillopora damicornis to address these issues. Results: We sampled Pocillopora damicornis colonies corresponding to two different mitochondrial lineages in different geographic areas displaying different thermal regimes: Djibouti,...
Tipo: Text
Palavras-chave: Coral holobiont; Microbiota; Bacterial communities; Symbiodinium assemblages; Thermal adaptation; Scleractinian corals; Coral reefs; Pocillopora damicornis.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00429/54076/55380.pdf

Thermal Stress Triggers Broad Pocillopora damicornis Transcriptomic Remodeling, while Vibrio coralliilyticus Infection Induces a More Targeted Immuno-Suppression Response
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Vidal-dupiol, Jeremie; Dheilly, Nolwenn M.; Rondon, Rodolfo; Grunau, Christoph; Cosseau, Celine; Smith, Kristina M.; Freitag, Michael; Adjeroud, Mehdi; Mitta, Guillaume.
Global change and its associated temperature increase has directly or indirectly changed the distributions of hosts and pathogens, and has affected host immunity, pathogen virulence and growth rates. This has resulted in increased disease in natural plant and animal populations worldwide, including scleractinian corals. While the effects of temperature increase on immunity and pathogen virulence have been clearly identified, their interaction, synergy and relative weight during pathogenesis remain poorly documented. We investigated these phenomena in the interaction between the coral Pocillopora damicornis and the bacterium Vibrio coralliilyticus, for which the infection process is temperature-dependent. We developed an experimental model that enabled...
Tipo: Text
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00221/33265/31738.pdf

Unexplored Refugia with High Cover of Scleractinian Leptoseris spp. and Hydrocorals Stylaster flabelliformis at Lower Mesophotic Depths (75–100 m) on Lava Flows at Reunion Island (Southwestern Indian Ocean)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Hoarau, Ludovic; Rouzé, Héloïse; Boissin, Émilie; Gravier-bonnet, Nicole; Plantard, Patrick; Loisil, Camille; Bigot, Lionel; Chabanet, Pascale; Labarrère, Priscille; Penin, Lucie; Adjeroud, Mehdi; Mulochau, Thierry.
Tipo: Text
Palavras-chave: Mesophotic coral ecosystem (MCEs); Reunion Island; Lower mesophotic zone; Scleractinian; Hydrocoral; Refugia; Biodiversity; Southwestern Indian Ocean.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00686/79841/82660.pdf