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Introduction
Publications
Publications (51)
The pearl-farming industry depends mostly on the natural recruitment of pearl oysters. Little is known about the relative influence of different ecological processes on the natural recruitment of pearl oysters across biogeo-graphical scales. Spatio-temporal dynamics of bivalve larvae and spats were described at Ahe and Mangareva, 1500 km apart acro...
Many reef organisms, such as the giant clams, are confronted with global change effects. Abnormally high seawater temperatures can lead to mass bleaching events and subsequent mortality, while ocean acidification may impact biomineralization processes. Despite its strong ecological and socio-economic importance, its responses to these threats still...
Non‐invasive functional exploration techniques can provide information on different aspects of general organism functioning and, unlike lethal or invasive techniques, allow individual organisms to be monitored for as long as necessary. For bivalves, a fairly wide variety of methods and instrumental means exist allowing physiology to be assessed on‐...
The black-lipped pearl oyster (Pinctada margaritifera) is extensively farmed in French Polynesia to produce black pearls. For a sustainable management of marine resources, studying interactions between organisms and environment, and the associated factors and processes that will impact their life cycle and thus modulate population dynamics is a maj...
Such as many other reef organisms, giant clams are today confronted to global change effects and can suffer mass bleaching or mortality events mainly related to abnormally high seawater temperatures. Despite its strong ecological and socio-economical importance, its responses to the two most alarming threats linked to global change (i.e., ocean war...
In French Polynesia black pearl farming represents one of the dominant business sectors. However, it still entirely relies on unpredictable Pinctada margaritifera spat collection success, which is itself conditioned by larval development completion. To assess the relationship between larval development and recruitment success, we studied under cont...
The objective of this study was to observe the impact of temperature on pearl formation using an integrative approach describing the rotation of the pearls, the rate of nacre deposition, the thickness of the aragonite tablets and the biomineralizing potential of the pearl sac tissue though the expression level of some key genes. Fifty pearl oysters...
Understanding the respective roles played by donor and recipient pearl oysters in pearl quality determination in relation to the environment is a challenge for the pearl industry. In most Pinctada species, pearl size is mainly related to recipient oyster growth performance but also relies to some extent on the biomineralisation activity of the pear...
Environmental management decisions based upon indicators are the end point of a process involving stakeholders and scientists. These steps should be explicit and follow a chronology. This paper presents a general framework for the design and use of management-oriented indicators, integrating management questions and performance criteria. We first e...
We analysed the temporal variability of meiobenthic (meiofauna and protists) abundance and community structure in the sediments of two shrimp farms located in New Caledonia. In each farm, sediment samples were collected weekly from February to June 2006 at two ponds, and analysed for quantity and composition of sedimentary organic matter, meiofauna...
In New Caledonia barren salt-pans located landward to mangroves are used for the construction of shrimp ponds. The existing farms are jeopardized by the projected rise in the sea level, because the landward boundaries of ponds are situated at the elevation reached by spring tides. One low-cost strategy for mitigating the effects of sea level rise i...
We have investigated temporal variability in the quantity and biochemical composition of sediment organic matter along with variables proxies of water eutrophication (e.g., inorganic nutrient and chlorophyll-a) at two shrimp farms located in the Southern coast of New Caledonia and characterised by clear differences in shrimp feeding practices and l...
This guide is intended to facilitate the implementation of specifications for marine environmental monitoring in New Caledonia. It is intended for public or private environmental actors. He provides a set of information on marine monitoring: summary of environmental regulations and the practical implications, definitions of terms, proposed general...
A description of bacterial pathogens in shrimp ponds is necessary to understand their pathogenesis. Vibrio nigripulchritudo was shown to contain saprophytic and pathogenic strains among New Caledonian isolates. We established a method to map the development of V. nigripulchritudo in pond sediments at three different genetic levels: the species leve...
L'implantation d'une usine métallurgique de l'industriel Koniambo Nickel SAS représente un moteur de développement économique pour la Province Nord : création d'emplois, fixation ou migration des populations, urbanisation pluys intensive... Ces changements sociétaux sont indissociables des enjeux de gestion du lagon de la zone Voh-Koné-Pouembout. Q...
Nakhlé, K., Cossa, D., Claisse, D., Beliaeff, B., and Simon, S. 2007. Cadmium and mercury in Seine Estuary flounders and mussels: the results of two decades of monitoring. – ICES Journal of Marine Science, 64: 929–938.
The flounder (Platichthys flesus) is a flatfish that inhabits marine coastal environments, especially estuaries. It is an alternati...
The mussel, Brachidontes variabilis, and the limpet, Patella sp., were used as indicators to monitor cadmium, lead and mercury concentrations along the Lebanese coast. Studies were carried out in order to define the best strategy for assessing and minimizing the effects of size and physiological condition on the metal contents of the molluscs, and...
In this paper, we present an approach to compare the impact of different management options oil the dynamics of a mixed fishery. We used ISIS-Fish, a simulation tool aimed at evaluating the impact of spatial and seasonal management measures on the dynamics of mixed fisheries. The French Nephrops norvegicus (Norway lobster) Merluccius merluccius (ha...
The diversity of reef ecosystems, the multiplicity of reef resource uses and the breadth of the range of the island socio-cultural contexts concerned make coral reef fisheries (CRF) management in the South Pacific a complex task. The health and state of the targeted resources depend both on ecosystem characteristics (as determined by ecological and...
A first list of dangerous substances to supervise was drawn up by the Environmental Protection Agency - EPA (the USA). International Conventions (e.g. Oslo-Paris) attempted to give priorities among the substances. This list was since reduced, but twenty five years of observations (in continuous protocols) along the French littoral, allow to draw up...
A first list of dangerous substances to supervise was drawn up by the Environmental Protection Agency - EPA (the USA). International Conventions (e.g. Oslo-Paris) attempted to give priorities among the substances. This list was since reduced, but twenty five years of observations (in continuous protocols) along the French littoral, allow to draw up...
Work Package 3 (WP3) uses the data generated by ecotoxicologists from 11 laboratories who sample twice per year at four sites (France, Italy, Spain and Greece) to conduct the Mediterranean portion of the BEEP programme (Biological Effects of Environmental Pollution in marine coastal ecosystems). The WP3 data have been compiled into files using a da...
The aim of this study is to characterize the large-scale geographical structures of microphytoplankton communities along French coasts. Once the temporal variability component shared by all sampled coastal sites was identified, and seasonal succession of microphytoplankton communities was described. A between-site analysis, using multiable comparis...
From April 1997 to June 1998, 14 measurements of acetylcholinesterase (AChE) enzymatic activity were performed with the copepod, Tigriopus brevicornis, collected at five stations in the Vilaine River estuary (South Brittany, France). Simultaneously, four chemical analyses of triazines and one analysis of total pesticides in water were undertaken. A...
Microalgal populations along French coasts (English Channel, Bay of Biscay and Mediterranean Sea) have been sampled twice a month since 1987 within the context of the French Phytoplankton and Phycotoxin Monitoring Network (REPHY). This study used these data to characterize the large-scale geographical structures of microphytoplankton communities an...
This paper compares data of 15 individual polycyclic aromatic hydrocarbon (PAH) concentrations from two monitoring programs: the French Rdseau National d'Observation de la qualité du milieu marin (RNO) and the Mussel Watch project of the U.S. National Status and Trends (NST) program. Polycyclic aromatic hydrocarbon measurements in bivalve (mussels...
A battery of biomarkers is often used to evaluate the effects of exposure to chemical contaminants and detect responses to environmental stress. Unfortunately, field application of biomarkers is subject to various constraints (e.g., the availability of living material) that can limit data acquisition and prevent the use of multivariate methods duri...
A battery of biomarkers is often used to evaluate the effects of exposure to chemical contaminants and detect responses to environmental stress. Unfortunately, field application of biomarkers is subject to various constraints (e.g., the availability of living material) that can limit data acquisition and prevent the use of multivariate methods duri...
This study aims to propose a tool to describe the long-term (10 years) variability of phytoplanktonic assemblages monitored by Rephy (French monitoring programme for phytoplankon and phycotoxins) in the English Channel, the Bay of Biscay and the Mediterranean French coastal waters. According to the sampling strategy (systematic survey, with a time-...
The Pacific oyster Crassostrea gigas is sporadically subject to summer blooms of the toxic dinoflagellate Alexandrium minutum along French coasts. To account for differences in toxin accumulation between oysters and mussels, trials were performed using a recirculating flume. All results were analyzed using two linear models, respectively describing...
The joint toxicity of nine binary mixtures of a metal (arsenic, copper, or cadmium) and a pesticide (carbofuran, dichlorvos, or malathion) was determined in the marine microcrustacean Tigriopus brevicornis (Müller) (Copepoda) by 96-h LC50 tests and measurement of acetylcholinesterase (AChE) inhibition. Acetylcholinesterase is used in the marine coa...
Results from two ''Mussel Watch''-type monitoring programs were compared: the Rseau National d'Observation de la qualit du milieu marin (RNO), the French monitoring network, and the Mussel Watch Project of the U.S. National Status and Trends (NS&T) Program. 80 RNO sites (47 for mussels and 33 for oysters) and 89 NS&T sites (45 for mussels and 44 fo...
Classical regression analysis can be used to model time series. However, the assumption that model parameters are constant over time is not necessarily adapted to the data. In phytoplankton ecology, the relevance of time-varying parameter values has been shown using a dynamic linear regression model (DLRM). DLRMs, belonging to the class of Bayesian...
Activity of 7-ethoxyresorufin-O-deethylase (EROD) in fish is certainly the best-studied biomarker of exposure applied in the field to evaluate biological effects of contamination in the marine environment. Since 1991, a feasibility study for a monitoring network using this biomarker of exposure has been conducted along French coasts. Using data obt...
As phytoplankton time series show high variabilities which are generated by processes occurring at differing spatial and temporal scales, static regression models may not be adapted to the inherent complexity of the data. The aim of this paper was to consider the advantages of Bayesian dynamic models for phytoplankton time series. Dynamic models al...
National Mussel Watch Programs collect bivalves at many sites along their respective coastlines in order to assess chemical contamination of coastal waters. This paper aims at detecting temporal trends at large spatial scales using contaminant data from 1986 to 1994 of the U.S. National Status and Trends Mussel Watch Program. U.S. coasts are divide...
Phytoplankton counts have been performed on the four sites of this study, twice monthly since 1987, within the framework of the French phytoplankton monitoring network (REPHY). Two of the sites are situated in lagoons communicating with sea (Thau and Leucate lagoons); the others are located in the open sea, in front of these lagoons. The cumulated...
Bivalves are used as bioindicators to assess trends of the chemical quality of coastal and marine environments due to their ability to concentrate chemicals. These shellfish are subject to seasonal physiological changes influencing the chemical concentration. Using quarterly data, we model concentration via linear regression with a biologically bas...
Conductance measurement for quantitative estimations of Escherichia coli in live bivalve shellfish was evaluated as an alternative to the conventional most probable number (MPN) method used in France. The sensitivity of the two techniques was comparable. A single regression line (r = -0.968, P < 10(-6)) between log10 MPN and detection time (DT) was...
Microbiological quality of shellfish production areas along the French coast is assessed through quantification of fecal coliforms, commonly used as indicators of fecal pollution. Their concentration is measured in filter-feeding molluscs, presumed to integrate highly fluctuating quantities of these germs from the surrounding filtrated water. In th...
The dilution method is used to obtain an indirect count of microorganisms, e.g. fecal bacteria commonly used as human contamination indicators, in a suspension. The Most Probable Number estimate provides a quantification of dilution method results. This estimate is commonly obtained by using Poisson distribution. Although the use of binomial distri...
