Forest Fragmentation Models 2021 Predict Isolated Tiger Groups Below Viability Thresholds

Some Sumatran tiger groups are now mathematically too small to survive long term.

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Population viability analysis is widely used in conservation biology to estimate extinction risk under different scenarios.

Population viability analyses assess whether small wildlife populations can persist without external intervention. Recent modeling of fragmented Sumatran tiger habitats indicates that certain isolated groups fall below sustainable thresholds. When breeding adults number in the dozens, random events such as disease or poaching have amplified impact. Demographic stochasticity can drive decline even without additional habitat loss. Fragmentation reduces dispersal, preventing natural recolonization. Conservation biologists use long-term projections to identify high-risk zones. In some cases, survival depends on reestablishing connectivity corridors. The risk is not speculative; it is calculated.

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Viability modeling transforms conservation from sentiment into probability analysis. Governments and NGOs must decide where to allocate limited funds based on statistical survival odds. Corridors may require land acquisition or policy reform, introducing economic negotiation into ecological planning. Without intervention, isolated pockets risk becoming ecological dead ends. The mathematics of extinction operates quietly but relentlessly. Each breeding female represents a measurable fraction of the future gene pool.

To the public, a forest may appear intact, yet demographic collapse can unfold invisibly. A disease outbreak in a 25-animal subpopulation can erase decades of recovery. Recovery timelines stretch across generations because tigers reproduce slowly. The uncomfortable realization is that extinction often begins long before the last individual disappears. Probability curves can foreshadow absence years in advance.

Source

Proceedings of the National Academy of Sciences (PNAS)

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