Caractérisation d’espèces bioindicatrices pour la surveillance des activités minières et la gestion de l’environnement en milieu récifal et lagonaire : application au lagon de Nouvelle-Calédonie

Abstract : Mining activities constitute the major economic resource of New Caledonia. This doctoral research was realized in order to develop a programme for biomonitoring mining contamination inthe New Caledonia coastal waters using marine organisms as “bioindicators”: the brown alga Lobophora variegata, the oysters Malleus regula and Isognomon isognomon and the clam Gafrarium tumidum. In this context, the bioindicative value of these four organisms for Ag, As, Cd, Co, Cr, Mn, Ni and Zn has been investigated through both laboratory and field experiments. Laboratory investigations of the bioaccumulation behaviour of the four organisms using radiotracer techniques demonstrated their high bioaccumulation and retention capacities for the contaminants tested. Moreover, the organisms respond to the most relevant criteria of a bioindicator species: the contaminant concentrations in organisms actually reflect those occurring in the environment. Field experiments showed that the analysis of contaminant concentrations in resident populations of clams, oysters and algae allowed discriminating sites according to their degree of contamination. In addition, transplantations of organisms between clean and contaminated sites indicated that the species displayed efficient bioaccumulation capacities for the contaminants in situ, and consequently, they can be used to monitor sites where the species were not naturally present. Overall, it is concluded that L. variegata, G. tumidum and I. isognomon are efficient and reliable bioindicator species that may be used for active and passive biomonitoring of mining contamination in the lagoon of New Caledonia.
Document type :
Theses
Complete list of metadatas

https://hal.ird.fr/tel-01171600
Contributor : Isabelle Gasser <>
Submitted on : Monday, July 6, 2015 - 6:02:27 AM
Last modification on : Thursday, January 11, 2018 - 6:20:37 AM
Long-term archiving on : Wednesday, April 26, 2017 - 12:28:16 AM

Identifiers

  • HAL Id : tel-01171600, version 1

Collections

Citation

Laëtitia Hédouin. Caractérisation d’espèces bioindicatrices pour la surveillance des activités minières et la gestion de l’environnement en milieu récifal et lagonaire : application au lagon de Nouvelle-Calédonie. Environnement et Société. Université de La Rochelle, 2006. Français. ⟨tel-01171600⟩

Share

Metrics

Record views

264

Files downloads

2142