Wildlife Reserve Network — Habitat Corridors & Poaching Risk

Reserve Management

Habitat corridors open 6 / 12

Ranger patrol coverage 50%

Poaching pressure 30%

Reserve initialised: 7 patches, 6 corridors open.

Metapopulation Status

Occupancy

—

At risk

—

Corridors

—

How it works

This reserve is a metapopulation: seven habitat patches (one core reserve, six surrounding fragments) each hold a local population that can wink out and be recolonised. Each patch's occupancy p_i (0 = empty, 1 = at carrying capacity) follows the Levins/Hanski metapopulation equation:

dp_i/dt = c_i (1 − p_i) − e_i p_i

c_i = c0 · Σ p_j   (sum over patches j linked to i
                     by an OPEN corridor)
e_i = e0 / q_i + poaching · (1 − patrol) · k

Habitat corridors — each open corridor lets colonists disperse from an occupied neighbour, raising c_i. A patch cut off from every neighbour can only be recolonised by chance, not by design.
Ranger patrols — patrol coverage multiplies down the poaching term in e_i; full coverage nearly cancels poaching-driven local extinction.
Poaching pressure — an external threat level; with weak patrols it drives e_i up and empties patches even when corridors are open.
Restore habitat — permanently raises the quality q_i of the weakest patch (bigger platform, lower baseline extinction e0/q_i).
Reintroduce species — instantly seeds the emptiest patch to p_i = 0.5, the way a real translocation program restarts a lost population.

Real-world relevance: this is the same patch-occupancy logic conservation biologists use to design nature-reserve networks — corridor connectivity and patrol funding trade off against poaching pressure and habitat quality to determine whether a species persists region-wide or collapses to a single, fragile patch.

Healthy population Poaching threat Ranger patrol

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