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How Bioturbation Activity by Macroinvertebrates Affect the Physical Structure of Sub Surface Sediments in River Systems

Author(s): Garima Lakhanpal; Roser Casas-Mulet; Michael Stewardson; Meenakshi Arora

Linked Author(s): Roser Casas-Mulet

Keywords: No Keywords

Abstract: Bioturbation activity by macroinvertebrates in freshwaters may influence the hyporheic exchange processes in river systems. In this study we focused on understanding how the upward conveyor macroinvertebratesLumbriculus Variegatus may impact the hyporheic processes through physical alterations of the sedimentstructure. We aim at investigating; (i) the spatial distribution of the bioturbators in sandy bedforms, and (ii) the effects of bioturbation on hyporheic flow path patterns. The following objectives were addressed in arecirculating perspex flume of dimensions 2.5m (L) X 0.2m (W) X 0.3m (H) filled with triple washed sand of0.2mm and clogged with clay particles of 0.002mm. The population densities in the flume are expected toconcentrate mostly in the downwelling zones/troughs of the bedforms. The hyporheic flow patterns and rates are hypothesized to expand and increase respectively in the presence of bioturbators in the flume. Variousphotogrammetry techniques were used to observe dye preferential flowpaths in the flume. Galleries were closely observed under an X-Ray by taking core samples along the flume. This study can help us understand the need and importance to protect the bioturbators communities for river restoration and healthy functioning of theecosystem.


Year: 2018

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