Microbial Adaptation to Nickel in New Caledonian Soil
New-Caledonia is characterized by the presence of ultramafic soils, derived from ultramafic rocks. They present extreme edaphic conditions with deficiencies in elementary elements such as carbon, nitrogen, phosphorus and a very high level of heavy metals, particularly nickel. For a long time, the under-soil has been intensively exploited for the nickel, and ore extraction from open cut mines has led to the destruction of the vegetation. Today, nickel mining represents a major environmental problem in New-Caledonia: no vegetation has naturally recolonized theses sites, and the attempts to revegetate with pioneer plant species have not been totally successful. While the effect of mining activities on vegetation is quite obvious, the effect on soil bacterial diversity and function has not been studied until now.
We observed several trends such as the increase in Actinomycetes in perturbed New Caledonia soil and the existence of novel Ni-resistance genes.
Ultrabio aptitude solao
Hery M, Herrera A, Vogel, TM., Normand P., Navarro E. 2005. Effect of carbon and nitrogen input on the bacterial community structure of Neocaledonian nickel mine soils. FEMS Microbial Ecology. 51: 333-340