FA-65345 / Ecological population dynamics / Member archive

Discrete logistic population with constant quota harvest: crowding feedback · case 05

Stocks never settle at carrying capacity; growth follows the initial density forever.

Member previewVariant 5 · 3 implementations · 7 checks per implementation

Case contract

Each year the quota is removed first; if the stock is then <= 0 the trajectory records 0.0 and stops; otherwise the survivors grow by r*N*(1-N/K); the trajectory starts with the unharvested N0; values rounded to 4; None for K<=0 or negative N0.

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: no harvest recovery	`[100.0, 152.5, 232.5625, 354.6578, 540.8532, 824.8011, 1257.8216, 1918.178]`	`[100.0, 152.5, 226.5578, 323.9962, 439.6637, 558.4838, 659.646, 729.084]`	Failed

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