Ref ID : 1331
Florian Malard, Jean-Louis Reygrobellet, Jacques Mathieu, and Michel Lafont; The use of invertebrate communities to describe groundwater flow and contaminant transport in a fractured rock aquifer. Arch.Hydrobiol. 131(1):93-110, 1994
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Using an air-lift pump, groundwater invertebrates of a fractured limestone site recharged with secondary sewage were collected by means of a dense network of deep observation wells. The spatio-temporal distribution of organisms throughout the dendritic system of interconnected joints and fissures was closely related to the heterogeneous groundwater and sewage flow pattern. During low water periods with high infiltration rates of sewage, groundwater communities were dominated by epigean organisms, which colonized the most conductive fractures. Later on, during periods of intensive groundwater recharge, these epigean organisms were displaced upstream of downstream of the study area and were also disseminated throughout the adjacent fissure network. They were associated with hypogean organisms, which were only collected when pristine groundwater circulated through the openings of the site.