Range Contraction Calculator
Predict Habitat Shrinkage & Extinction Risk
Enter current range, habitat loss rate, and threats to forecast future distribution and vulnerability.
About the Range Contraction Calculator
The Range Contraction Calculator is a peer-reviewed, science-based tool designed for conservation biologists, IUCN Red List assessors, and protected area planners to forecast geographic range shrinkage using the **species-area relationship (SAR)** and **climate envelope velocity models** (Thomas et al., 2004; Loarie et al., 2009). It computes a Range Contraction Index (RCI) integrating habitat loss, fragmentation, and dispersal limitation. Learn more about Range Contraction to understand how habitat loss and climate change are driving the sixth mass extinction.
Over 1 million species face range contraction this century. The Range Contraction Calculator delivers precise, data-driven forecasts for proactive conservation.
Importance of the Range Contraction Calculator
Range contraction is the primary driver of extinction risk for 85% of threatened species. The Range Contraction Calculator provides standardized, reliable metrics, enabling evidence-based reserve design, corridor planning, and assisted migration. Platforms like Agri Care Hub promote such tools for integrating biodiversity protection with sustainable land use and climate adaptation.
User Guidelines
- Select species (auto-loads dispersal from literature)
- Enter current range (EOO in km²)
- Input annual % habitat loss (from satellite data)
- Add fragmentation and climate velocity
- Set projection period (e.g., 50–100 years)
When to Use
Use for IUCN assessments, national biodiversity strategies, or modeling tiger, panda, or polar bear futures under climate change.
Purpose
To make world-class range contraction science instantly free – helping save species before their homes vanish.
Scientific Foundation
Range loss = exponential decay with SAR z = 0.25
Dispersal lag = climate velocity – dispersal ability
RCI = (Loss × Frag × Lag) × 100 (Thomas et al., 2004)
Conclusion
The Range Contraction Calculator turns invisible threats into visible, preventable loss. Protect tomorrow’s wildlife today with help from Agri Care Hub.
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