Invasive Species Presence

AUS-TSR-FOR-ISP General Low confidence

Benchmark Value

25 %

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 6 benchmarks together — the OptimalRange form drives the primary score, while 5 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary MinimumOnly Guard LowerThreshold Guard MaximumOnly Guard Point Guard OptimalRange Guard

Evidence & Context

The Upper Detrimental Threshold is the point beyond which invasive species are no longer just a manageable pressure but become the dominant structuring force in the ecosystem. Evidence suggests this threshold is crossed when: Dominant invasive weed cover exceeds 25%, forming dense, landscape-altering thickets (e.g., Lantana) that suppress all native regeneration and alter fire behaviour.

Metric Definition:

Dominant invasive weed cover exceeding 25%, forming dense, landscape-altering thickets.

Benchmark Definition:

Upper detrimental threshold for invasive species cover indicating ecosystem phase shift in tropical rainforest production forestry.

Justification:

At these levels of infestation, the impacts are transformative, fundamentally altering ecosystem processes.