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Guide méthodologique et technique : Indice Diatomique de Nouvelle-Calédonie (IDNC)

Abstract : In New Caledonia, integrated management of aquatic environments and resources has been identified since the early 2000s as a priority and was one of the objectives of the action plan drawn up in 2004 by local (government, Provinces) and national authorities in the framework of the overseas action plan of the National Strategy for Biodiversity (SNB). This plan is currently in its second cycle of implementation (2011-2020). This priority is also recognized by the Caledonian Sustainable Development Plan, as well as by the Regional Strategy for Biodiversity of PROE (i.e. Oceanian regional program for environment). Following the thematic "freshwater" workshops in April 2010, the Observatory of the Environment in New Caledonia (OEIL), the Department of Veterinary, Food and Rural Affairs (DAVAR) from the government of New Caledonia and the CNRT "Nickel and its environment" have decided to support a Research and Development program aimed at developing a new biological index for rivers based on a compartment of phototrophic primary producers, the benthic diatoms. The implementation of this program, which was carried out from October 2012 to the end of 2017, was entrusted to a consortium experienced in that field, which associated the French national Research Institute in Science and Technology for the Environment and Agriculture (IRSTEA) and the private consultants Asconit Consultants and Bioeko. The objective of this document is to provide a practical manual intended to allow the implementation of the Diatomic Index of New Caledonia (IDNC) under methodological conditions guaranteeing reliability of the results. In that aim, it describes every stages of implementation of the IDNC, since the sampling of the diatoms until the calculation of the index score, without omitting the samples treatment, the permanent slides confection, the realization of diatom inventories and data banking. It also includes a chapter describing the different phases of the index design, in order to allow operators and project managers to understand the main principles of its development and operation. Even if more theoretical, this information is essential for the good prescription of the IDNC as for the interpretation of its results. This document is complementary to the IDNC Final Report (Marquié et al. 2018) and to the last edited version of the atlas of New Caledonian diatoms, Volume 1 (Marquié et al., 2018 a) and Volume 2 (Marquié et al., 2018 b) It addresses the key elements for implementing the IDNC in a practical and educational way.
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E. Lefrançois, J. Marquié, Sébastien Boutry, Michel Coste, François Delmas, et al.. Guide méthodologique et technique : Indice Diatomique de Nouvelle-Calédonie (IDNC). OEIL (Observatoire de l'Environnement en Nouvelle-Calédonie), pp.93, 2018. ⟨hal-02609894⟩

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