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Potential physical effects of suspended fine sediment on lotic macroinvertebrates

journal contribution
posted on 07.04.2020, 10:09 by M McKenzie, Kate Mathers, Paul Wood, J England, I Foster, D Lawler, M Wilkes
© 2019, Springer Nature Switzerland AG. This study investigates the potential for physical damage caused by suspended fine sediment on gills of three macroinvertebrate species, Hydropsyche siltalai, Ephemera danica and Ecdyonurus venosus. Macroinvertebrate cadavers were exposed to three suspended sediment concentrations (control 3.5, low 83.7 and high 404.0 mg l−1) at two velocities (low 0.19 m s−1 and high 0.37 m s−1), for 6 h in a recirculating flume. Tracheal gill surfaces were subsequently examined for evidence of physical damage using scanning electron microscopy (SEM) images. Physical damage predominantly consisted of fine sediment coverage of gill surfaces, appearing as a deposited layer of sediment obscuring and potentially clogging the gill. For E. venosus, suspended sediment concentration influenced gill cover, but velocity had no significant effect. Coverage of H. siltalai gill surfaces increased significantly between low and high sediment concentrations but only at the higher flow velocity. Gill coverage of E. danica did not differ across any sediment concentration. The results were consistent with reported species sensitivities to fine sediment, despite the use of cadavers. However, we found limited evidence of physical abrasion as a direct physical effect of fine sediment under the experimental conditions used.

Funding

Postgraduate Research Fund from the British Society of Geomorphology

History

School

  • Social Sciences

Department

  • Geography and Environment

Published in

Hydrobiologia

Volume

847

Issue

3

Pages

697 - 711

Publisher

Springer

Version

AM (Accepted Manuscript)

Rights holder

© Springer

Publisher statement

This is a post-peer-review, pre-copyedit version of an article published in Hydrobiologia. The final authenticated version is available online at: https://doi.org/10.1007/s10750-019-04131-x

Acceptance date

15/11/2019

Publication date

2019-12-05

Copyright date

2020

ISSN

0018-8158

eISSN

1573-5117

Language

en

Depositor

Prof Paul Wood . Deposit date: 6 April 2020

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