A5023870785- Marine Bivalve and Aquaculture Studies
- Aquaculture Nutrition and Growth
- Calcium Carbonate Crystallization and Inhibition
- Physiological and biochemical adaptations
- Ocean Acidification Effects and Responses
- Microplastics and Plastic Pollution
- biodegradable polymer synthesis and properties
- Marine Biology and Environmental Chemistry
- Invertebrate Immune Response Mechanisms
- Cephalopods and Marine Biology
- Marine Biology and Ecology Research
- Aquaculture disease management and microbiota
- Isotope Analysis in Ecology
- Reproductive biology and impacts on aquatic species
- Bone Tissue Engineering Materials
- Recycling and Waste Management Techniques
- Crustacean biology and ecology
- Echinoderm biology and ecology
- Paleontology and Stratigraphy of Fossils
- Aquatic Invertebrate Ecology and Behavior
- Neurobiology and Insect Physiology Research
- Parasite Biology and Host Interactions
- Marine and fisheries research
- Thermoregulation and physiological responses
- Agriculture and Rural Development Research
University of French Polynesia
2014-2024
Institut de Recherche pour le Développement
2021-2023
Ifremer
2008-2023
Ecosystèmes Insulaires Océaniens
2011-2022
Labex Corail
2014-2022
Institut Louis Malardé
2020-2021
Laboratoire de Biologie Intégrative des Modèles Marins
2007-2008
Collège de France
1995-1997
Plastic pollution in the environment is increasing at global scale. Microplastics (MP) are derived from degradation of larger plastic items or directly produced microparticles form (< 5 mm). Plastics, widely used structures and equipment pearl farming, a source to detriment lagoon ecosystem. To evaluate impact MP on physiology Pinctada margaritifera, species ecological commercial interests, adult oysters were exposed polystyrene microbeads (micro-PS 6 10 μm) for 2 months. Three...
Black pearl farming is based on culture of the blacklip oyster Pinctada margaritifera (Mollusca, lophotrochozoa), a protandrous hermaphrodite species. At first maturation, all individuals are males. The female sex appears progressively from two years old, which represents limitation for broodstock conditioning aquaculture production. In marine mollusks displaying hermaphroditic features, data sexual determinism and differentiation, including molecular determining cascade, scarce. To increase...
In this study, we analyzed the combined effect of microalgal concentration and temperature on shell growth bivalve Pinctada margaritifera molecular mechanisms underlying biomineralization process. Shell was measured after two months rearing in experimental conditions, using calcein staining calcified structures. Molecular were studied though expression 11 genes encoding proteins implicated process, which assessed mantle. We showed that is influenced by both temperature, these environmental...
Pearl-farming leads to significant plastic pollution in French Polynesia (FP) as the end of life most farming gear is currently poorly managed. Plastic debris released into aquatic environment accumulates, with potentially detrimental effects on lagoon ecosystem and pearl oyster Pinctada margaritifera, a species ecological, commercial social value. Here, we tested leachates from new (N) aged (A) pearl-farming (spat collector synthetic rope) obtained after 24 h 120 incubation, embryo-larval...
A combined approach integrating bioenergetics and major biological activities is essential to properly understand the impact of microplastics (MP) on marine organisms. Following experimental exposure polystyrene microbeads (micro-PS 6 10 μm) at 0.25, 2.5, 25 μg L-1, which demonstrated a dose-dependent decrease energy balance in pearl oyster Pinctada margaritifera, transcriptomic study was conducted mantle tissue. Transcriptomic data helped us decipher molecular mechanisms involved P....
Pearl-farming is the second most important source of income in French Polynesia. However, tropical lagoons are fragile ecosystems with regard to anthropogenic pressures like plastic pollution, which threaten marine life and pearl oyster-related economy. Here, we investigated spatial distribution microplastics (MP) concentrations surface water (SW), column (WC) cultivated oyster (PO) from three pearl-farming atolls low population tourism. Microplastics were categorized by their size class,...
Abstract The purpose of this study was to examine the responses oyster Crassostrea gigas oxygen levels at subcellular and whole organism levels. Two experiments were carried out. first experiment designed measure clearance consumption rates oysters exposed different concentrations 15, 20 25°C for h. goal part estimate hypoxic threshold below which their metabolism shifts towards anaerobiosis, by estimating critical point (PcO2) 25°C. second out evaluate metabolic adaptations hypoxia days...
The pearl industry in French Polynesia is based on exploitation of natural stocks the blacklip oyster (Pinctada margaritifera). It generates an annual turnover €90 million. Improvements quality need genetic studies to improve populations. This a protandric species, which sex ratio normally biased toward males. There increasing interest gender control find mechanisms augment female proportions for management purposes. review summarizes information exogenous and endogenous factors regulating...
Some mollusc shells are formed from an amorphous calcium carbonate (ACC) compound, which further transforms into a crystalline material. The transformation mechanism is not fully understood but however crucial to develop bioinspired synthetic biomineralization strategies or accurate marine biomineral proxies for geoscience. difficulty arises the simultaneous presence of and compounds in shell, complicates selective experimental characterization fraction. Here, we use nanobeam X-ray total...
Activity of digestive enzymes (trypsin, chymotrypsin and amylase) was studied in relation with food Penaeus vannamei larvae first stages.Microparticles containing casein involved the decrease soluble protein content enzyme activities.Specific trypsin activity but not correlated ( p < 1 %) to level between 10 60% microparticles.Cellulose fibres seemed have little effect on enzymes.Starch, 20% microparticles, had no influence specific amylase activity.The different feeding conditions were also...
Pearl farming is crucial for the economy of French Polynesia. However, rearing structures contribute significantly to plastic waste, and widespread contamination pearl lagoons by microplastics has raised concerns about risks industry. This study aimed evaluate effects micro-nanoplastics (MNPs, 0.4–200 μm) on oyster (Pinctada margaritifera) over a 5-month production cycle closely mimicking ecological scenarios. MNPs were produced from weathered gear tested at environmentally relevant...
Experimental infections of Penaeus (Litopenaeus) stylirostris were performed with a Vibrio penaeicida strain (AM101) isolated in New Caledonia from Syndrome 93 diseased shrimp. Cumulative mortalities resulting intramuscular injection or immersion shrimp bacterial suspensions demonstrated high virulence for this and suggested that V. could be the etiological agent 93. The median lethal dose (LD50) AM101 was 1.3 x 10(4) CFU (colony forming units) ml-1 by less than 5 shrimp-1 challenge,...