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RESEARCH ARTICLE

Structure, distribution patterns and ecological responses to hydrological changes in benthic macroinvertebrate assemblages in a regulated semi-arid river: baseline for biomonitoring studies

Marta Leiva https://orcid.org/0000-0002-2858-3282 A B D , Mercedes Marchese C and Liliana Diodato B
+ Author Affiliations
- Author Affiliations

A Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Godoy Cruz 2290 (C1425FQB) CABA, Argentina.

B Instituto de Protección Vegetal (INPROVE), Facultad de Ciencias Forestales (FCF), Universidad Nacional de Santiago del Estero (UNSE), Avenida Belgrano (Sur) 1912, Santiago del Estero, Santiago del Estero, CP 4200, Argentina.

C Instituto Nacional de Limnología (INALI), CONICET–Universidad Nacional del Litoral, Ciudad Universitaria – Paraje El Pozo, Santa Fe, CP 3000, Argentina.

D Corresponding author. Email: martaleiva@unse.edu.ar

Marine and Freshwater Research 72(2) 200-212 https://doi.org/10.1071/MF19283
Submitted: 18 August 2019  Accepted: 21 April 2020   Published: 22 June 2020

Abstract

Biological monitoring requires a comprehensive baseline of assemblage distribution patterns and their environmental drivers. In this study we evaluated benthic macroinvertebrates in a regulated river, located in a semi-arid region, which has a seasonal flood pulse and is affected by several anthropogenic pressures. Taxonomic and trophic structures of benthic macroinvertebrate assemblages were analysed in terms of their longitudinal distribution, hydrological regime and environmental factors, including the effects of hydromorphology, riparian land use and water abstraction. Most taxa were generalists and classified in the collector–gatherer functional feeding group. A large taxonomic replacement was associated with hydromorphological characteristics. Local environmental variables were critical for macroinvertebrate assemblages. There was significant temporal variability regarding seasonal flood pulse. Water abstraction for irrigation had a strong effect on assemblage structure. We suggest some challenges and issues for successful implementation of biomonitoring tools in the Dulce River, related primarily to high spatiotemporal variability.

Additional keywords: Chaco region, spates, spatiotemporal variability, water diversion.


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