Laini et al. 2019_water-11-01478.pdf (1.23 MB)
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Taxonomic and functional responses of benthic macroinvertebrate communities to hydrological and water quality variations in a heavily regulated river

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posted on 13.08.2019, 12:15 authored by Alex Laini, Pierluigi Viaroli, Rossano Bolpagni, Tommaso Cancellario, Erica Racchetti, Simone GuareschiSimone Guareschi
Aquatic macroinvertebrates are frequently used to evaluate river system conditions and restoration project performance. A better understanding of macroinvertebrate community responses to multiple stressors is a primary challenge for river science. In this paper, macroinvertebrate responses to hydrological and water quality variability were studied in the regulated Oglio River (northern Italy). We hypothesized that in regulated rivers the hydrological, rather than the physico-chemical conditions, would affect macroinvertebrate communities and biomonitoring tools (taxonomic metrics and functional indices). Repeated sampling (six times a year) was performed at four sites downstream of four dams in a 30 km river stretch during 2014 and 2015. Data were analysed using a linear mixed effect framework, to take into account random variation due to site and sampling date, and with multivariate analysis to track changes in community structure. A total of 69 families and 134,693 organisms were identified. The investigated metrics were mainly affected by the coefficient of variation of discharge, minimum discharge, ammonium, and temperature. The short-term dynamics of hydrological and physico-chemical variables were generally less important than the overall random effects as drivers of macroinvertebrate-based metrics. However, the relevance of a random effect (site, time, their interaction) differed depending on the biological metrics analysed. Understanding potential differences in response to short term and short stretch conditions would benefit biomonitoring and restoration procedures in both regulated and natural rivers.

Funding

Consorzio dell’Oglio (Lombardy Region) as part of the Project ‘Evaluation of the Vital Minimum Flow of the Oglio River (2012–2015)’

University of Parma (Italy)

Royal Society-Newton International Fellowship 2018 at Loughborough University, UK (NIF\R1\180346)

History

School

  • Social Sciences

Department

  • Geography and Environment

Published in

Water

Volume

11

Issue

7

Publisher

MDPI AG

Version

VoR (Version of Record)

Rights holder

© The authors

Acceptance date

12/07/2019

Publication date

2019-07-16

Copyright date

2019

eISSN

2073-4441

Language

en

Depositor

Dr Simone Guareschi

Article number

1478