JGR Earth Surface - 2022 - Mason - Aquatic Insect Bioconstructions Modify Fine‐Sediment Entrainment and Mobility.pdf (1.53 MB)
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Aquatic insect bioconstructions modify fine‐sediment entrainment and mobility

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journal contribution
posted on 03.03.2022, 12:03 by RJ Mason, Stephen RiceStephen Rice, MF Johnson, Paul WoodPaul Wood, D Vettori
The importance of two-way interactions between animals and the physical hydraulic and sedimentological environment are increasingly recognized (e.g., zoogeomorphology). Caddisflies (Trichoptera) are a group of aquatic insects known for their bioconstructions, particularly cases built from fine sediment and silk. Caddisfly cases differ in size, shape and density from the incorporated sediment, and case construction may therefore affect the mobility of these sediments in rivers. However, although communities of caddisfly often use substantial quantities of sediment in case construction, the effect of these bioconstructions on sediment transport in rivers is unknown. We use a flume experiment to compare the bed shear stress required to transport (a) empty caddisfly cases and (b) individual sediment particles, following disaggregation from the case. The cases of three species were considered; two that construct different styles of tubular case (Potamophlax latipennis and Sericostoma personatum) and one that builds a domed case (Agapetus fuscipes). P. latipennis and S. personatum cases were easier to entrain than the sediment grains incorporated into them, whilst A. fuscipes cases were not. Despite their low mass, A. fuscipes cases required the most shear stress to transport them because their domed shape impeded rolling. These findings are important to understand how differences in case design between species, reflect different adaptation strategies to the turbulent hydraulic river habitat. Furthermore, the results suggest that un-attached tubular caddisfly cases may be preferentially transported over other particles on the river bed and thus, where caddisfly occur in high abundance, they may increase fluvial entrainment of sand.

Funding

Central England NERC Training Alliance (CENTA)

Natural Environment Research Council

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History

School

  • Social Sciences and Humanities

Department

  • Geography and Environment

Published in

Journal of Geophysical Research: Earth Surface

Volume

127

Issue

2

Publisher

American Geophysical Union (AGU)

Version

VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This is an Open Access Article. It is published by American Geophysical Union (AGU) under the Creative Commons Attribution 4.0 International Licence (CC BY 4.0). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/

Acceptance date

20/12/2021

Publication date

2022-02-21

Copyright date

2022

ISSN

2169-9003

eISSN

2169-9011

Language

en

Depositor

Prof Paul Wood. Deposit date: 2 March 2022

Article number

e2021JF006399