Sampling water and sediment in interstitial habitats: a comparison of coring and pumping techniques
Mauclaire, L.; Marmonier, P.; Gibert, J.
published: Apr 27, 1998
ArtNo. ESP141014201007, Price: 29.00 €
Two methods used for sampling water and sediment in interstitial habitats, the Bou-Rouch pumping method and the coring method, were compared in three contrasting stations and checked by directly shovelling the sediment in order to estimate their relative efficiency. The three sampling stations were an abandoned gravel pit fed by groundwater with coarse bottom sediments, an abandoned channel of the Rhône River fed by groundwater with fine bottom sediment rich in organic matter, and an infiltration basin fed by the rainwater collected from an industrial area, with a partially clogged bottom sediment composed of coarse particles mixed with sand and clay. Both techniques gave similar results for chemical (Dissolved Organic Carbon, nitrate and sulfate contents) and biological (total bacterial and ETS-active bacterial abundances) characteristics. Bou-Rouch pumping did not induce any important erosion of biofilms, and differences between stations and between sampling dates were similarly recorded by both methods. Whatever method used, fine ( <1 mm) sediment contents were similar but pumping did not collect sand particles larger than 1 mm.