Invasive Species Presence

AUS-TSR-CON-ISP General Moderate confidence

Benchmark Value

No specific value — see range

Thresholds: Lower: 1, Upper: —

Direction: Lower is desirable ↓

Form: LowerThreshold

Scoring Curve

Scoring curve unavailable

The scoring engine could not generate a curve for this benchmark context. The primary form is CompositeFramework, but the benchmark data may be missing required fields (e.g., optimal range bounds for an OptimalRange benchmark). This is typically a data quality issue in the benchmark pipeline.

Contributing Benchmarks

CompositeFramework Primary LowerThreshold Guard UpperThreshold Guard MaximumOnly Guard LowerThreshold Guard MaximumOnly Guard MinimumOnly Guard CompositeFramework Guard

Evidence & Context

The lower critical threshold is not a measure of density or percentage cover but is the establishment of a single, viable, reproducing population.

Metric Definition:

Initial establishment of a viable, reproducing population of a key ecosystem-transforming invasive species.

Benchmark Definition:

The point at which a viable, reproducing population of an invasive species is established, marking ecological compromise in tropical and subtropical rainforest conservation areas.

Justification:

This event represents the point at which an area's ecological integrity is fundamentally compromised, marking the transition from prevention to active response.

Sources (1)

Yellow Crazy Ant eradication success a wake up call for federal fire ... GreyLiterature

Yellow Crazy Ant eradication success a wake up call for federal fire ...

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Supporting Sources (7)

Additional references from the underlying research that informed this benchmark.

Daintree National Park Management Plan 2019 - Parks and forests

Contextual Support Journal

Daintree National Park Management Plan 2019 - Parks and forests

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Invasive species and pathogens pressure on the Wet Tropics of Queensland

Direct Evidence Journal

Invasive species and pathogens pressure on the Wet Tropics of Queensland

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Invasive species are Australia's number-one extinction threat - CSIRO

Contextual Support Government

Invasive species are Australia's number-one extinction threat - CSIRO

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Miconia calvescens DC. - Hawaiian Ecosystems at Risk project (HEAR)

Direct Evidence Journal

Miconia calvescens DC. - Hawaiian Ecosystems at Risk project (HEAR)

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The impact of feral pigs (Sus scrofa) on an Australian lowland ...

Contextual Support Government

The impact of feral pigs (Sus scrofa) on an Australian lowland ...

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Wet Tropics of Queensland | World Heritage Outlook - IUCN, accessed July 20, 2025,

Contextual Support Government

Wet Tropics of Queensland | World Heritage Outlook - IUCN

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Yellow Crazy Ant Eradication Program | Wet Tropics Management ...

Contextual Support Government

Yellow Crazy Ant Eradication Program | Wet Tropics Management ...

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Context

Region Australia
Biome Tropical & Subtropical Rainforests
Land Use Conservation / Protected Natural Areas
Assessment Conservation Target
Evidence Type DegradationThreshold

Lifecycle

Status Active
Version 1
Effective From 21 Mar 2026

Notes

Lower Critical Threshold: 1 presence/absence. No upper detrimental threshold — higher values are always worse up to natural saturation. A single Miconia tree can create a persistent seed bank of millions of seeds. A single Yellow Crazy Ant colony can spread at ~50m/year.