FA-65698 / Ecological population dynamics / Member archive

Two-patch source-sink dispersal with ceilings: patch-specific ceiling · case 03

The sink patch is allowed to fill to the source ceiling.

Member previewVariant 3 · 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: sink ceiling binding	`[[45.75, 111.25], [77.9813, 114.9938], [110.5298, 128.8383], [146.4181, 151.8767]]`	`[[34.75, 78.25], [57.3563, 81.7188], [80.438, 92.1877], [103.427, 101.1423]]`	Failed

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