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Fig. 4. Tritonia diomedea detects and turns away downstream from upstream
predators in the flow tank. T. diomedea tracks with a predator (solid
lines) and controls (dotted lines) with similarly shaped latex tubing in the
odour stimulus chambers (osc). With an upstream predator, those slugs that
crawled into a plume zone downstream of the predator had a greater tendency to
turn downstream. The inset shows the downstream turn magnitude (P=predator;
C=control) measured by comparing mean crawling headings for the 2 min on
either side of the estimated plume zone entry points (+). Slugs in four
experimental trials (x) and two control trials (o) crawled upstream and
contacted the second upstream grille without entering the plume zone. A
further three animals (2 controls, 1 experimental) reached neither the plume
zone nor the upstream grille. Tracks are projected onto a scaled and
simplified flow tank diagram. Flow tank width, 1 m.
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