Área mínima viável UC (ha)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
This calculator estimates the minimum viable area of a Conservation Unit (UC) based on the minimum population needed for species persistence and the territory area per individual (or per group). The result is given in hectares (ha) and serves as an initial guideline for protected area planning.
The formula used is simple: A = pop × territory_per_capita, where 'pop' is the minimum number of adult individuals required to maintain genetic and demographic viability (typically between 50 and 500, depending on species and context) and 'territory_per_capita' is the average area (in ha) needed per individual for resources such as food, shelter, and reproduction. These values must be obtained from specific studies.
This tool is useful for biologists, environmental managers, and conservation planners who need a first estimate of the minimum area of a UC for a target species. For example, when planning a reserve for the jaguar, population and home range data can be used to calculate the required minimum size.
Important: the calculation is a simplification and does not replace more complex analyses that consider habitat quality, connectivity between areas, environmental heterogeneity, and external threats. Additionally, the minimum viable population varies greatly among species and contexts, and the territory per capita may change seasonally or with population density.
Frequently asked questions
What does 'minimum viable population' mean?
It is the minimum number of adult individuals needed for a population to reproduce and survive long-term, avoiding genetic and demographic problems. This value usually ranges from 50 to 500 individuals, depending on the species.
How do I obtain the 'territory per capita' value?
This data comes from scientific studies on the species, such as radio-telemetry research or field observations that measure the home range of each individual. If no specific data is available, estimates from similar species can be used with caution.
Can I use this calculator for any species?
Yes, as long as you have the appropriate parameters. However, note that species with very different needs (e.g., migratory birds or plants) may require more complex models, and this calculation is a simplification.
Does the calculated area guarantee species conservation?
No. The area is only a minimum requirement based on space. Factors such as habitat quality, prey availability, competition, and climate change are also crucial. Always consult a specialist for real decisions.
What if the existing conservation unit is smaller than the calculated area?
If the UC is smaller, the species may not persist long-term. Measures such as ecological corridors, area expansion, or population management may be necessary. The calculation serves as a warning for planning.