Acoustic Complexity Index (ACI)

AUS-ASC-FOR-ACI General Moderate confidence

Benchmark Value

No specific value — see range
Range: 132.9 to 136.7 index
Optimal Range: 132.9 to 136.7
Direction: Higher is desirable ↑
Form: OptimalRange

Scoring Curve

This curve shows how a field measurement for this indicator would score across all available benchmark forms in this context.

Evidence & Context

Heathy Dry Forest... ACI Range: 132.9 – 136.7

Metric Definition:

Spectrogram complexity based on frequency bins (1–11 kHz), calculated as the sum of relative changes in acoustic intensity across temporal steps, using the mean of the 95th percentile daily values with 95% confidence intervals.

Benchmark Definition:

Healthy operational range for acoustic complexity in Heathy Dry Forest in Southeastern Australia.

Justification:

Represents reference baseline ranges for dry forest types with high shrubby cover, applicable to managed forest environments containing complex woody understories.

Sources (1)

Preview of A REPORT ON A COMMUNITY PARTNERSHIP IN ECO-ACOUSTIC MONITORING IN MOUNT WORTH STATE PARK, VICTORIA, accessed May 14, 2026,
A REPORT ON A COMMUNITY PARTNERSHIP IN ECO-ACOUSTIC MONITORING IN MOUNT WORTH STATE PARK, VICTORIA, accessed May 14, 2026, Journal

A Report on a Community Partnership in Eco-Acoustic Monitoring in Brisbane Ranges

View Source

Context

  • Region Australia
  • Biome Alpine and Subalpine Complex
  • Land Use Production Forestry
  • Assessment Pristine Reference
  • Vegetation Forest
  • Evidence Type ReferenceCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 13 Jun 2026

Notes

Above-ground soundscape recording under field conditions.

Related Benchmarks

Other benchmarks in the AUS-ASC-FOR-ACI family.

137.5 index Moderate
Production Forestry · Pristine Reference · Forest
Point Active v1
— index Moderate
Production Forestry · Pristine Reference · Forest
OptimalRange Active v1
135.2 index Moderate
Production Forestry · Pristine Reference · Forest
Point Active v1
— index Moderate
Production Forestry · Pristine Reference · Forest
OptimalRange Active v1
133.8 index Moderate
Production Forestry · Conservation Target · Forest
Point Active v1
— index Moderate
Production Forestry · Conservation Target · Forest
OptimalRange Active v1
— index Moderate
Production Forestry · Pristine Reference · Woodland
OptimalRange Active v1