Aquatic biological monitoring, richard hunt
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This document discusses environmental flow assessments conducted in the Barron River and Mitchell River regions. In the Barron River, which is highly regulated, stable isotope analysis showed that benthic algae are an important carbon source for consumers. Studies examined how algal growth and ecosystem metabolism, as indicators of primary production, are affected by variations in river flow. In the less regulated Mitchell River, the study aimed to better understand natural food web functioning and the importance of dry and wet season production. Results showed external carbon sources mainly support fish communities in the dry season, while local production and connectivity to floodplains and marine areas boost productivity significantly in the wet season.
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1. Water reform in Australia is led by the National Water Commission and National Water Initiative, which aim to establish a nationally compatible system for managing water resources.
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This document summarizes a visit to the Department of the Environment, Water, Heritage and the Arts in Canberra on November 23, 2009. It lists the host, Christine Schweizer, and presentation details from Seung-Hoon Baek on community water input, Bruce Gray on water quality, and Ben Docker on the Commonwealth Environmental Water Holder initiative. Contact information is provided for further information or questions.
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Queensland's water planning process has two parts: (1) a Water Resource Plan which involves technical assessments, community consultation, and public review; and (2) a Resource Operations Plan which implements the WRP through monitoring, assessment and 10-year reviews. The WRP considers factors like hydrology, water use, climate change and environmental values.
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Aquatic biological monitoring, richard hunt
- 1. North Region: Environmental Flow Assessment Dr Richard Hunt, DERM, Mareeba, Qld.
- 4. Test site Ref site Barron River Barron River – most regulated system in the Wet Tropics Tinaroo Falls Dam Irrigated agriculture Town water supply Hydroelectric facility at Barron Falls
- 5. Barron River at Bilwon: Test site
- 6. Flaggy Creek: Reference site
- 7. 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.
- 8. Can flow regulate instream primary production?
- 9. Indicator 1. Algal growth: artificial substrates Riffle habitat: bedrock and sand. Temporally and spatially replicated experimental units.
- 10. Algal biomass
- 11. Indicator 2. Ecosystem metabolism: primary production determined from diurnal change of dissolved oxygen Run/pool habitat
- 15. GPP: first flow pulse
- 16. Volumetric
- 17. 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
- 18. Mitchell River
- 19. Mitchell River: large unregulated catchment
- 20. Mitchell River Collaboration with Griffith University (TRaCK) Improve understanding of natural functioning of food webs Importance of dry season and wet season production
- 21. Discharge and water temperature
- 22. Dry season primary production
- 23. Food webs for early and late dry season: dry season
- 24. External sources of carbon major contributor to fish communities Local sources of carbon maintain dry season production
- 25. Wet season very important for large mobile consumers: fish and prawns
- 26. Algal production in the Floodplain
- 27. Terrestrial vegetation via insects
- 28. Increased connection with marine production
- 29. Productivity of these river systems depend upon floodplain inundation and connectivity