Acoustic Complexity Index (ACI)

AUS-ASC-FOR-ACI General Moderate confidence

Benchmark Value

No specific value — see range
Range: 130.5 to 137 index
Optimal Range: 130.5 to 137
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

Grassy Woodland... ACI Range: 130.5 – 137.0

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 Grassy Woodland community in Southeastern Australia.

Justification:

Grassy woodlands often represent the transition zones in subalpine foot-slopes and valleys, providing an excellent structural analogue.

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

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