FA-65710 / Ecological population dynamics / Member archive

Two-patch source-sink dispersal with ceilings: dispersal conservation · case 05

Dispersal creates individuals.

Member previewVariant 5 · 3 implementations · 7 checks per implementation

Case contract

Each year each patch grows by its lambda and is capped at its own ceiling, then fraction disperse of each post-growth patch moves to the other simultaneously; return yearly [N1, N2] rounded 4.

Why this case matters

Population projections set harvest quotas, conservation status and pest-control timing; a wrong update order, boundary or rate conversion silently changes management advice.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: meadow source woodland sink	`[[152.8, 44.0], [206.16, 70.8], [209.912, 89.56], [212.5384, 102.692], [214.3769, 111.8844]]`	`[[122.8, 41.2], [153.128, 59.912], [168.3877, 73.5507], [170.2971, 81.1884], [171.3664, 85.4655]]`	Failed

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