Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences
RESEARCH ARTICLE

The effects of altered flow and bed sediment on macroinvertebrates in stream mesocosms

Ivor Growns A C , John F. Murphy B and J. Iwan Jones B

A Environmental and Rural Sciences, University of New England, Armidale, NSW 2351, Australia.

B School of Biological and Chemical Sciences, Queen Mary University of London, London, E1 4NS, UK.

C Corresponding author. Email: grownsi@yahoo.com.au

Marine and Freshwater Research - http://dx.doi.org/10.1071/MF15160
Submitted: 21 April 2015  Accepted: 29 February 2016   Published online: 25 May 2016

Abstract

River regulation and altered land use are common anthropogenic disturbances resulting in ecological impacts through siltation or altered hydrology. We tested the separate and combined effects of increased flow and fine particles (colmation) on macroinvertebrates in flume mesocosms. We hypothesised that increased flow would reduce any effects of colmation. We tested two bed types, namely clean and colmated sediment where fines were 10% by weight. Two flow rates were initially established, namely a turbulent flow in six mesocosms and a lower rate to create a transitional flow between turbulent and laminar flows in the remaining six mesocosms. After 30 days, macroinvertebrates were sampled and the flow in three turbulent-flow mesocosms and three transitional-flow mesocosms switched to the lower and higher flow rates respectively, thus creating four flow scenarios. The experiment was concluded after sampling macroinvertebrates again at Day 70. We demonstrated that colmation and decreased flows individually result in decreased density and richness of macroinvertebrates and altered assemblage and trait structure. However, our hypothesis that higher flows would ameliorate any effects of fines was not supported. Further research is required to evaluate whether lower thresholds of colmation have ecological impacts and determine the velocities required to ameliorate those impacts.

Additional keywords: benthos, colmation, flume mesocosms, river regulation, sedimentation.


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