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Anthropogenic litter is a novel habitat for aquatic macroinvertebrates in urban rivers

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journal contribution
posted on 04.02.2021, 09:33 by Hazel L. Wilson, Matthew F. Johnson, Paul Wood, Colin R. Thorne, Markus P. Eichhorn
Anthropogenic litter (solid manufactured waste) is an understudied but pervasive element of river systems worldwide. Its physical structure generally differs from natural substrates, such as gravel and cobbles (hereafter rocks). Consequently, anthropogenic litter could influence ecological communities in urban rivers by providing novel habitats. This study compares the macroinvertebrates recorded on anthropogenic litter with those on rocks to test whether the different substrates support distinct communities. Macroinvertebrates were collected from individual rocks and anthropogenic litter, predominantly plastic, metal, and glass, in three U.K. rivers. Macroinvertebrate communities on anthropogenic litter were consistently more diverse than those found on rocks, reflecting its greater surface complexity, but the density of macroinvertebrates was similar among substrates. The community composition also varied between substrates, with five taxa only recorded on anthropogenic litter. Community differences largely reflected greater abundances of common taxa on anthropogenic litter, which were relatively insensitive to environmental quality. Plastic and fabric anthropogenic litter communities were the most dissimilar to those on rocks, probably due to their flexibility, which could replicate the physical structure of aquatic macrophytes. Our findings indicate that anthropogenic litter supports a distinct and diverse community of macroinvertebrates in urban rivers, which are otherwise relatively homogenous in habitat structure. Removal of anthropogenic litter from urban rivers may not be beneficial for local biodiversity. Understanding the functional habitats provided by anthropogenic litter could help better manage urban rivers to replace habitat lost through urbanisation.

Funding

Engineering and Physical Sciences Research Council, UK [grant number EP/N50970X/1]

History

School

  • Social Sciences and Humanities

Department

  • Geography and Environment

Published in

Freshwater Biology

Volume

66

Issue

3

Pages

524-534

Publisher

Wiley

Version

VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This is an Open Access Article. It is published by Wiley 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

11/11/2020

Publication date

2020-12-05

Copyright date

2021

ISSN

0046-5070

eISSN

1365-2427

Language

en

Depositor

Prof Paul Wood. Deposit date: 2 February 2021