Water Turbidity

AUS-TSW-CON-WTU General Moderate confidence

Benchmark Value

5 NTU
Thresholds: Lower: —, Upper: 5
Direction: Lower is desirable ↓
Form: MaximumOnly

Scoring Curve

This curve shows how a field measurement for this indicator would score across all available benchmark forms in this context. The scoring engine uses 8 benchmarks together — the OptimalRange form drives the primary score, while 7 guard(s) constrain the result.

Evidence & Context

A study examining trait responses along environmental gradients identified a significant ecological tipping point for macroinvertebrate communities, observing a substantial drop in the abundance of tegument-respiring invertebrates at turbidity levels beyond just 5 NTU.

Metric Definition:

Water turbidity measured as the optical measure of water clarity, quantifying the degree to which light is scattered and absorbed by suspended and dissolved materials.

Benchmark Definition:

This benchmark marks the turbidity level beyond which sensitive macroinvertebrate communities begin to decline, indicating ecological degradation.

Justification:

This threshold marks the beginning of ecological degradation for sensitive macroinvertebrate taxa.

Sources (1)

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Determining Tipping Points and Responses of Macroinvertebrate Traits to Abiotic Factors in Support of River Management - PubMed Central, accessed July 16, 2025, Journal

Determining Tipping Points and Responses of Macroinvertebrate Traits to Abiotic Factors in Support of River Management. Water, 15(8), 1589.

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Supporting Sources (51)

Additional references from the underlying research that informed this benchmark.

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(PDF) Lowland Rivers: An Australian Introduction - ResearchGate, accessed July 16, 2025,
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Contextual Support

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Contextual Support Journal

Effects of common carp on water quality and submerged vegetation: results from a short-term mesocosm experiment in an artificial wetland - CSIRO Publishing, accessed July 21, 2025,

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Effects of Sedimentation and Turbidity on Lotic Food Webs: A Concise Review for Natural Resource Managers - ResearchGate, accessed July 16, 2025,
Contextual Support

Effects of Sedimentation and Turbidity on Lotic Food Webs: A Concise Review for Natural Resource Managers - ResearchGate, accessed August 17, 2025

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Contextual Support Journal

Effects of Sedimentation and Turbidity on Lotic Food Webs: A Concise Review for Natural Resource Managers - Southern Research Station, accessed August 17, 2025

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Contextual Support Journal

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Contextual Support Direct Evidence Journal

Effects of turbidity on the feeding ability of the juvenile migrant stage of six New Zealand freshwater fish species

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Fine Sediment Intrusion and its Consequences for River Ecosystems: A Review | Journal of Hazardous, Toxic, and Radioactive Waste | Vol 27, No 1 - ASCE Library, accessed July 16, 2025,

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Influence of salinity on light conditions and phytoplankton growth in a turbid river, accessed July 16, 2025,
Contextual Support Methodology Source Journal

Influence of salinity on light conditions and phytoplankton growth in a turbid river, accessed July 16, 2025,

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Contextual Support

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Multi-decadal trends in large-bodied fish populations in the New South Wales Murray13Darling Basin, Australia - CSIRO Publishing, accessed July 16, 2025,

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Contextual Support

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The effects of turbidity, prey density and environmental complexity on the feeding of juvenile Murray cod Maccullochella peelii | Request PDF - ResearchGate, accessed July 16, 2025,
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The effects of turbidity, prey density and environmental complexity on the feeding of juvenile Murray cod Maccullochella peelii | Request PDF - ResearchGate, accessed August 10, 2025

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Context

  • Region Australia
  • Biome Temperate Semi-Arid Shrublands & Open Woodlands
  • Land Use Conservation / Protected Natural Areas
  • Assessment Pristine Reference
  • Evidence Type DegradationThreshold

Lifecycle

  • Status Active
  • Version 1
  • Effective From 15 Mar 2026

Notes

Even very low levels of chronic turbidity can exert strong selective pressure, filtering out the most physiologically sensitive components of the invertebrate community.