Invasive Species Presence

AUS-TSR-LVG-ISP General Moderate confidence

Benchmark Value

10 t/ha
Thresholds: Lower: —, Upper: 10
Direction: Lower is desirable ↓
Form: UpperThreshold

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.

Evidence & Context

Andropogon gayanus increasing fine fuel loads from a native baseline of ~6 t/ha to >10 t/ha triggers a catastrophic shift in fire intensity from ~2,000 kW/m to >15,000 kW/m, transforming the ecosystem.

Metric Definition:

Fine fuel load of Andropogon gayanus (Gamba grass) in tonnes per hectare

Benchmark Definition:

Fine fuel load of Gamba grass in tonnes per hectare.

Justification:

Fuel loads above 10 t/ha cause a fundamental shift in fire regime with catastrophic ecological consequences.

Sources (1)

Preview of BIODIVERSITY RESEARCH: Turning up the heat: the impacts of Andropogon gayanus (gamba grass) invasion on fire behaviour in northern Australian savannas | Request PDF - ResearchGate
BIODIVERSITY RESEARCH: Turning up the heat: the impacts of Andropogon gayanus (gamba grass) invasion on fire behaviour in northern Australian savannas | Request PDF - ResearchGate Journal

The impacts of Andropogon gayanus (gamba grass) invasion on the fire danger index and fire management at a landscape scale - ResearchGate, accessed July 19, 2025,

View Source

Supporting Sources (3)

Additional references from the underlying research that informed this benchmark.

Preview of Fighting Plagues and Predators - CSIRO, accessed July 19, 2025,
Fighting Plagues and Predators - CSIRO, accessed July 19, 2025,
Contextual Support GreyLiterature

Fighting Plagues and Predators - CSIRO, accessed July 19, 2025,

View Source
Preview of Impact threshold for an alien plant invader, Lantana camara L., on native plant communities
Impact threshold for an alien plant invader, Lantana camara L., on native plant communities
Direct Evidence Journal

Impact threshold for an alien plant invader, Lantana camara L., on native plant communities, accessed July 19, 2025,

View Source
Preview of www.publish.csiro.au, accessed May 20, 2025,
www.publish.csiro.au, accessed May 20, 2025,
Direct Evidence Journal

The threats to Australia's imperilled species and implications for a national conservation response - CSIRO Publishing, accessed July 19, 2025,

View Source

Context

  • Region Australia
  • Biome Tropical & Subtropical Rainforests
  • Land Use Livestock Grazing & Pasture
  • Assessment Pristine Reference
  • Evidence Type DegradationThreshold

Lifecycle

  • Status Retired
  • Version 1
  • Effective From 21 Mar 2026
  • Effective To 21 Mar 2026

Notes

This threshold represents a tipping point for fire regime alteration and ecosystem transformation.