Patch scale response of hyporheic invertebrates to fine sediment removal in two chalk rivers.

Octavian Pacioglu, Peter Shaw, Anne Robertson

Research output: Contribution to journalArticlepeer-review


Abstract: Groundwater-fed permeable catchments are very susceptible to fi ne sediment infi ltration into the stream bed (colmation), leading to potential reductions in hydraulic conductivity and therefore modification of oxygen
and nutrient exchange between hyporheic and surface waters. We investigated the effect of fi ne sediment (2 mm) removal on invertebrate assemblages in the shallow hyporheic zones of two chalk rivers using a fi eld experimental
approach. We used colonization chambers containing one of two treatments: control and unclogged sediments. Anions, cations and dissolved oxygen did not differ signifi cantly between treatments suggesting good connectivity between surface and hyporheic waters. Total Organic Carbon differed signifi cantly between treatments (p0.01) and was higher in the control. In the hyporheic assemblage only Oligochaeta abundance differed signifi cantly between
treatments (p0.01) and was higher in the control. Overall our study suggests that patch-scale restoration of sediments does not alter hyporheic invertebrate community composition in chalk rivers.
Original languageEnglish
Pages (from-to)283-288
Number of pages6
Publication statusPublished - 1 Jul 2012


  • colmation, fi ne sediment removal, hydraulic conductivity, hyporheic zone, patch-scale restoration.

Cite this