Acoustic Complexity Index (ACI)

AUS-ASC-FOR-ACI General Moderate confidence

Benchmark Value

137.5 index
Direction: Higher is desirable ↑
Form: Point

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 Point Guard

Evidence & Context

Grassy Dry Forest... Mean ACI: 137.5

Metric Definition:

Mean spectrogram complexity based on frequency bins (1–11 kHz), calculated from 10-minute daily 95th percentile values.

Benchmark Definition:

Reference-condition target point for acoustic complexity in mature, structurally complex Grassy Dry Forest in Southeastern Australia.

Justification:

The cited source explicitly identifies the value in a reference-site context for Grassy Dry Forests in Southeastern Australia.

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

Monitored using Wildlife Acoustics Song Meter sensors over continuous multi-day deployments, capturing above-ground avian soundscapes.

Related Benchmarks

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

— index Moderate
Production Forestry · Pristine Reference · Forest
OptimalRange 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