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Fig. 2. Tritonia diomedea detect and locate upstream prey odour sources in
the flow tank. T. diomedea tracks with (solid lines) and without
(dotted lines) their prey in an upstream odour stimulus chamber (osc). With
upstream prey, eight of nine slugs crawled upstream to make direct contact
with the upstream grille, and seven of nine found the osc (x marks point
of first contact with upstream grille). In controls, only one slug crawled
directly upstream, three eventually reached the upstream grille crawling after
contact with the sidewalls, and none found the empty osc (o marks point of
first contact with upstream grille). Tracks are projected onto a scaled and
simplified flow tank diagram. Flow tank width, 1 m.
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