Fig. 3. Distance from the source as a function of time is shown for an arbitrary sample of three simulations at four different rheotaxis weightings. (A) Searchers with a weighting of 0.4 eventually move downstream, away from the source, following blobs of chemical stimulus. All searchers with a weighting of 0.5 move upstream to the source, displaying varying periods of little movement, as stimulus blobs move downstream of the searcher. Searchers move upstream to the source at close to maximum speed, when rheotaxis weightings are 0.7 (the 3 tracks overlap) (B). With a weighting of 1.0, searchers blessed with a low bias in determining flow direction move directly upstream to the source, while others veer cross-stream of the source and move upstream of it, or move out of the plume and rarely progress.

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