2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/25/2021 | 8:30 AM - 10:30 AM | TOWARDS UPSCALING THE EFFECTS OF FLOW ON RIVER GROSS PRIMARY PRODUCTIVITY | Virtual Platform

TOWARDS UPSCALING THE EFFECTS OF FLOW ON RIVER GROSS PRIMARY PRODUCTIVITY

Patterns of streamflow in river ecosystems are undergoing change due to human activities. Current understanding of ecological responses to environmental flows largely comes from small-scale monitoring of discrete events. However, flow-ecology assessments at larger spatial and temporal scales are required for management decisions, making the upscaling of observations a pressing research challenge. We developed time-series and hierarchical linear models with the aim of predicting the effect of hydrology and other environmental variables on gross primary productivity, a fundamental ecosystem process. These models incorporated the temporal autocorrelation and spatially nested structure of the productivity estimates, which were measured over five years as part of the Long Term Intervention Monitoring program in Australia’s Murray-Darling Basin. Water temperature explained a large proportion of the strong seasonal variation. Productivity was positively associated with its lagged values, likely reflecting that past productivity increases producer biomass. Increases in flow negatively affected the rate of productivity per litre of water but increased total system productivity due to the higher flow volume. We envisage that these models will be valuable for forecasting the effect of flow on primary productivity at unsurveyed times and locations across the landscape.

Ecosystem functioning
Flow regime
Energy flows

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Presenters/Authors

Darren Giling (), University of Canberra / CSIRO, darren.giling@canberra.edu.au;