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Publications (5)2.14 Total impact

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    ABSTRACT: For the past ten years, the ird (Institut de recherche pour le développement) has developed a multidisciplinary programme dealing with the effects of natural and anthropogenic terrigenous inputs on the New Caledonia coral reef lagoon which is currently subjected to environmental pressure due to population increase and development of the mining industry. The ongoing study focused on three main categories of inputs: (i) particles generated by erosion processes and responsible for excessive sediment inputs in the lagoon, (ii) metals exhibiting a potentially lethal effect on the lagoon biota, (iii) nutrients responsible for eutrophication. This article presents three examples of environmental issues that could be addressed through complementary research approaches: (i) the dispersion of terrigenous inputs as commended by currents, (ii) the fate of metals in the lagoon and their accumulation in the biota, (iii) the effects of nutrient enrichment on pelagic communities. Results are presented while keeping in mind the necessary applied outcomes requested from a research programme devoted to development issues. Such outcomes are mainly related to the identification of suited environmental diagnostic tools and to the development of modelling approaches yielding synthetic and predictive information on the status and fate of coral reef lagoons subject to anthropogenic stress.
    Journal de la Société des océanistes 06/2008; 126-127:41-58.
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    ABSTRACT: This review presents environmental and biological indicators of the impact of three major categories of inputs in coral reef lagoons i.e. particles, nutrients and metals. Information was synthesized to extract well established indicators together with some interesting new concepts currently under development, and to provide the reader with an assessment of their respective advantages and drawbacks. The paper has been organized according to the capacity of three categories of indicators to respond either in a specific or a non specific way to a given source of input. The first section focuses on abiotic indicators which main interest is to respond instantaneously and in a truly specific way to a given source of input. The second and third sections present informations on bioindicators either at the sub-individual level or at the individual to community level, indicator specificity generally decreasing as a direct function of biological or ecological complexity. This review showed that even though significant work has already been done on coral reef ecosystems, much more scientific studies are still needed to answer the growing local demands for simple and truly validated tools to be used in environmental surveys. It is further stressed that, due to the biological and environmental diversity of coral reef lagoons, a preliminary step of on-site validation must be considered as an absolute prerequisite when indicators are planned to be used in the frame of a local environmental monitoring programme. Résumé – Cette synthèse bibliographique présente les caractéristiques environnementales et biologiques pouvant être utilisées comme indicateurs des effets de trois grandes catégories d'apports exogènes dans les milieux récifo-lagonaires : les particules, les éléments nutritifs et les métaux. Les données de la littérature ont été analysées pour en extraire des indicateurs reconnus ainsi que de nouveaux concepts en cours de développement, et afin d'examiner leurs avantages et inconvénients respectifs. L'article a été structuré selon la capacité de trois types d'indicateurs à répondre de manière spécifique ou non spécifique à l'une des trois catégories d'apports cités précédemment. En premier lieu, les indicateurs abiotiques qui ont pour principal intérêt de répondre instantanément et spécifiquement à l'un des trois types d'apports, puis les bio-indicateurs respectivement considérés à l'échelle infra-organisme ou à une échelle allant de l'organisme à la communauté. La spécificité de ces indicateurs diminuant en fonction de l'augmentation de la complexité biologique et écologique. Bien qu'il existe déjà un nombre important de travaux portant sur les systèmes récifo-lagonaires, un effort scientifique majeur reste nécessaire pour répondre à des demandes croissantes de définition d'outils simples et validés pouvant être utilisés dans le cadre de la surveillance de l'environnement. De plus, et compte tenu de la diversité biologique et environnementale des lagons et des récifs coralliens cette étude montre que l'utilisation d'indicateurs, dans le cadre de programmes de suivi environnementaux à l'échelle locale, passe par une phase préliminaire indispensable de validation sur site, des indicateurs sélectionnés.
    Aquatic Living Resources 01/2005; 18(18):125-147. · 1.07 Impact Factor
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    ABSTRACT: This review presents environmental and biological indicators of the impact of three major categories of inputs in coral reef lagoons i.e. particles, nutrients and metals. Information was synthesized to extract well established indicators together with some interesting new concepts currently under development, and to provide the reader with an assessment of their respective advantages and drawbacks. The paper has been organized according to the capacity of three categories of indicators to respond either in a specific or a non specific way to a given source of input. The first section focuses on abiotic indicators which main interest is to respond instantaneously and in a truly specific way to a given source of input. The second and third sections present informations on bioindicators either at the sub-individual level or at the individual to community level, indicator specificity generally decreasing as a direct function of biological or ecological complexity. This review showed that even though significant work has already been done on coral reef ecosystems, much more scientific studies are still needed to answer the growing local demands for simple and truly validated tools to be used in environmental surveys. It is further stressed that, due to the biological and environmental diversity of coral reef lagoons, a preliminary step of on-site validation must be considered as an absolute prerequisite when indicators are planned to be used in the frame of a local environmental monitoring programme.
    Aquatic Living Resources 01/2005; 18:125-147. · 1.07 Impact Factor
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    Environmental Changes and radioactive tracers, Edited by Jean Michel Fernandez, Renaud Fichez, 01/2002: pages 187-199; IRD Editions, Paris, France., ISBN: 2-7099-1493-X
  • SPERA 2000 conference on Environmental changes and radioactive tracers, Nouméa, New Caledonia; 06/2000