FA-65775 / Ecological population dynamics / Member archive

Monthly population with seasonal breeding window: wrapping window · case 05

Breeding seasons that span the new year never occur.

Member previewVariant 5 · 3 implementations · 7 checks per implementation

Case contract

Calendar month of step t is ((start_month-1+t) mod 12)+1; the breeding window is inclusive and may wrap across the new year (start > end); each month survival is applied first, then in breeding months births fecundity*N*max(0,1-N/cap); return monthly N 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: southern winter breeding wraps	`[47.5, 45.125, 42.8687, 40.7253, 38.689, 36.7546]`	`[47.5, 56.6262, 67.0395, 78.7377, 91.6459, 87.0636]`	Failed

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