Labat F.,Laboratoire dhydrobiologie |
Labat F.,Bordeaux Montaigne University |
Piscart C.,CNRS Ecology of Natural and Anthropized Hydrosystems Laboratory |
Fontan B.,Laboratoire dhydrobiologie
Limnologica | Year: 2011
In Europe, the number of establishment of non-native species, especially from Ponto-Caspian area, has dramatically increased over the past decades and induced important changes in macroinvertebrate assemblages, mainly in large rivers. However, although many Ponto-Caspian species were established in adjacent countries, only two Ponto-Caspian amphipods were formally observed in French hydrosystems since 1996. To update our knowledge on the present distribution of the Ponto-Caspian species in France, we collected amphipods from 203 sites in the Rhine, Meuse and Seine River basins in 2008 and again in 2009. Thirteen amphipod species were found in the study area. Among them, four were first formally recorded in France (Dikerogammarus haemobaphes, Dikerogammarus bispinosus, Echinogammarus ischnus, and Echinogammarus trichiatus). Our study revealed three different corridors used by these species to arrive in France. We also observed a different pattern of colonization for each species, which might indicate some between-species differences in their preferences for environmental conditions. The snapshot of the early distributions of these recently established species may hence be used to study the invasion pattern in France in order to manage their potential impact in and outside France. © 2010 Elsevier GmbH.
El Fadeli S.,Laboratoire dHydrobiologie |
Chaik M.,Laboratoire dHydrobiologie |
Pineau A.,Laboratoire Of Toxicologie Et Dhygiene Industrielle |
Lekouch N.,Laboratoire dHydrobiologie |
Sedki A.,Laboratoire dHydrobiologie
Trace Elements and Electrolytes | Year: 2012
Hair analysis is an accurate, low cost and non-invasive method of determining the level of essential mineral elements (Cu, Mn, Zn and Pb), as well as toxic burden. Because hair is also susceptible to external contamination from the environment, hair should be washed before analysis. Having done so, sruface contgaminatin would be removed before starting the analysis. The core objective of this study was testing the effectiveness and aggressiveness of three washing procedures on the hair. This testing aimed at comparing the degree of removing the external trace elements caused by environment from the hair. The conclusion that was drawn from this discussion was that combining the two procedures (natural and chemical), may have effective results concerning eliminating the external trace elements and saving the hair from aggressiveness. The finally adopted procedure removed effectively all external contaminants, without being too aggressive on the hair. This procedure did not remove the elements incorporated into the hair matrix, as this fraction alone reflects the accumulation of trace elements in the organism. ©2012 Dustri-Verlag Dr. K. Feistle.