Temporal variability of fauna and the importance of sampling frequency in the hyporheic zone

摘要: Sampling of the hyporheic zone along a polluted stretch Aries River (Romania) showed contrasting biodiversity and abundance patterns at different time scales. The species considered in this study were Crustacea Oligochaeta only more frequently occurring included analyses. Monthly composition these little correlation with physical chemical parameters. In contrast, when subsets monthly samples two most abundant species, Microcharon sp. Diacyclops languidoides, analyzed, there strong correlations least some major parameters (temperature, flow rate, Al, Fe) each three possible seasonal series. However, between series sometimes contradictory appeared to be artifacts related sparse data. It is suggested that or frequent sampling required for complete assessment processes relationship hyporheos surface river ecosystem.