aquatic biological monitoring, richard hunt
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North Region: Environmental Flow Assessment
Dr Richard Hunt, DERM, Mareeba, Qld.
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Barron River
Barron River – most regulated system in the Wet Tropics
Tinaroo Falls Dam Irrigated agriculture Town water supply Hydroelectric facility at Barron Falls
Test site Ref site
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Barron River at Bilwon: Test site
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Flaggy Creek: Reference site
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In-stream carbon sources are important for the food web
Stable isotope analysis of terrestrial and aquatic primary producers, and consumers. δ13C ratio remains stable as it passes through the food chain. Benthic algae important carbon source for consumers in Barron main channel.
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Can flow regulate instream primary production?
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Indicator 1. Algal growth: artificial substrates
Riffle habitat: bedrock and sand. Temporally and spatially replicated experimental units.
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Algal biomass
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Indicator 2. Ecosystem metabolism: primary production determined from diurnal change of dissolved oxygen
Run/pool habitat
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GPP: first flow pulse
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Volumetric
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Fish, prawns and other consumers depend upon algal carbon sources River flows can have a strong effect on in-stream primary production Very important how water is delivered – not just quantity Natural flow regime provides a template for effective flow management
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Mitchell River
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Mitchell River: large unregulated catchment
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Mitchell River
Collaboration with Griffith University (TRaCK) Improve understanding of natural functioning of food webs Importance of dry season and wet season production
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Discharge and water temperature
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Dry season primary production
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Food webs for early and late dry season: dry season
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External sources of carbon major contributor to fish communities Local sources of carbon maintain dry season production
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Wet season very important for large mobile consumers: fish and prawns
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Algal production in the Floodplain
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Terrestrial vegetation via insects
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Increased connection with marine production
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Productivity of these river systems depend upon floodplain inundation and connectivity