FA-65713 / Ecological population dynamics / Member archive

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

Dispersal numbers ignore this year's reproduction.

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: meadow source woodland sink	`[[134.0, 30.0], [179.2, 41.8], [172.52, 56.74], [176.844, 62.874], [177.206, 66.8058]]`	`[[122.8, 41.2], [153.128, 59.912], [168.3877, 73.5507], [170.2971, 81.1884], [171.3664, 85.4655]]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.