## Problem 189 — rank:282

**Title:** Predictability of community dynamics

**Added binding assumptions (LaTeX):**

```latex
A forecast risk need not increase monotonically with horizon in a seasonal or mean-reverting system. Define a contiguous acceptable horizon using all earlier horizons, or call the original supremum the last acceptable horizon rather than an uninterrupted predictability window. The conditional-variance identity is known; estimating its value under a biologically credible observation law and quantifying gains from feasible measurements are the unresolved tasks.
```

**Direct edits:** 1. **Fresh external checks:** None; supplied sources retained as provenance.