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Compounding effects of agricultural land use and water use in free-flowing rivers: confounding issues for environmental flows

Hardie, SA and Bobbi, CJ 2017 , 'Compounding effects of agricultural land use and water use in free-flowing rivers: confounding issues for environmental flows' , Environmental Management, vol. 61, no. 3 , pp. 421-431 , doi: 10.1007/s00267-017-0836-1.

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Defining the ecological impacts of water extraction from free-flowing river systems in altered landscapes is challenging as multiple stressors (e.g., flow regime alteration, increased sedimentation) may have simultaneous effects and attributing causality is problematic. This multiple-stressor context has been acknowledged in environmental flows science, but is often neglected when it comes to examining flow-ecology relationships, and setting and implementing environmental flows. We examined the impacts of land and water use on rivers in the upper Ringarooma River catchment in Tasmania (south-east Australia), which contains intensively irrigated agriculture, to support implementation of a water management plan. Temporal and spatial and trends in river condition were assessed using benthic macroinvertebrates as bioindicators. Relationships between macroinvertebrate community structure and environmental variables were examined using univariate and multivariate analyses, focusing on the impacts of agricultural land use and water use. Structural changes in macroinvertebrate communities in rivers in the catchment indicated temporal and spatial declines in the ecological condition of some stretches of river associated with agricultural land and water use. Moreover, water extraction appeared to exacerbate impairment associated with agricultural land use (e.g., reduced macroinvertebrate density, more flow-avoiding taxa). The findings of our catchment-specific bioassessments will underpin decision-making during the implementation of the Ringarooma water management plan, and highlight the need to consider compounding impacts of land and water use in environmental flows and water planning in agricultural landscapes.

Item Type: Article
Authors/Creators:Hardie, SA and Bobbi, CJ
Keywords: water use, land use, macroinvertebrates, multiple stressors, environmental flows, adaptive management
Journal or Publication Title: Environmental Management
Publisher: Springer-Verlag
ISSN: 0364-152X
DOI / ID Number: 10.1007/s00267-017-0836-1
Copyright Information:

Copyright 2017 Springer Science+Business Media New York

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