Abstract
Sampling of the hyporheic zone along a polluted stretch of the Arieş River (Romania) showed contrasting biodiversity and abundance patterns at different time scales. The species considered in this study were Crustacea and Oligochaeta and only the more frequently occurring species were included in the analyses. Monthly composition of these species showed a little correlation with physical and chemical parameters. In contrast, when subsets of the monthly samples of the two most abundant species, Microcharon sp. and Diacyclops languidoides, were analyzed, there were strong correlations with at least some of the major physical and chemical parameters (temperature, flow rate, Al, and Fe) in each of the three possible seasonal series. However, correlations between seasonal series were sometimes contradictory and appeared to be artifacts related to sparse data. It is suggested that monthly or more frequent sampling is required for the complete assessment of biodiversity and processes in the hyporheic zone and to study the relationship between the hyporheos and the surface river ecosystem.
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Acknowledgments
We are grateful to Traian Brad, Sanda Iepure, Ioana Nicoleta Meleg, and Claudia Pavelescu for species identification and to Mihai Terente for the map. We are indebted to the two reviewers for the corrections and suggestions and especially to Stuart Halse who considerably improved the quality of the paper. The study was funded by the Romanian Academy and through the grant 31_032/2007 (CNMP, Ministry of Education, Research and Innovation, Romania).
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Moldovan, O.T., Levei, E. Temporal variability of fauna and the importance of sampling frequency in the hyporheic zone. Hydrobiologia 755, 27–38 (2015). https://doi.org/10.1007/s10750-015-2215-3
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DOI: https://doi.org/10.1007/s10750-015-2215-3