eDNA Biodiversity Detection

AUS-TDG-AGR-DNA General Moderate confidence

Benchmark Value

30 %

Thresholds: Lower: 30, Upper: —

Direction: Higher is desirable ↑

Form: LowerThreshold

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 2 benchmarks together — the OptimalRange form drives the primary score, while 1 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary MinimumOnly Guard

Evidence & Context

A Lower Critical Threshold is inferred from the well-established ecological principle that terrestrial ecosystem function and vertebrate diversity decline rapidly when native vegetation cover in a landscape falls below 30%.

Metric Definition:

Percentage of native vegetation cover in the surrounding landscape

Benchmark Definition:

This benchmark defines a critical lower threshold of native vegetation cover below which terrestrial ecosystem function and vertebrate diversity decline rapidly in temperate dry woodlands and native grasslands under agricultural crop production.

Justification:

This 30% threshold is one of the most widely cited and empirically supported ecological thresholds in Australian conservation science.

Sources (1)

The Impacts of Land Use Change on Biodiversity in Australia - ResearchGate GreyLiterature

The Impacts of Land Use Change on Biodiversity in Australia - ResearchGate

View Source

Supporting Sources (1)

Additional references from the underlying research that informed this benchmark.

Innovative eDNA citizen science for biodiversity conservation in agricultural landscapes

Contextual Support GreyLiterature

Innovative eDNA citizen science for biodiversity conservation in agricultural landscapes

View Source

Context

Region Australia
Biome Temperate Dry Woodlands & Native Grasslands
Land Use Agricultural Crop Production
Assessment Pristine Reference
Evidence Type DegradationThreshold

Lifecycle

Status Retired
Version 2
Effective From 24 Mar 2026
Effective To 24 Mar 2026

Notes

An aquatic ecosystem situated within a catchment that has fallen below the 30% native vegetation threshold is, by definition, operating in a critically compromised state. The biodiversity signal from such a system represents a condition below the lower critical threshold for maintaining long-term ecological function, resilience, and the ability to support a diverse and healthy native aquatic community. Accepted by operator on 2026-03-24 09:42 UTC — superseded v1 (#1690)

Related Benchmarks

Other benchmarks in the AUS-TDG-AGR-DNA family.