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Fig. 2. (A) Tested adult newts inhabited stream pools along a 4 km stretch of Tuna
Canyon Creek in Malibu, California, USA. In each 5-min trial, an investigator
hid behind rock boulders that lined the stream, and continuously released
solution (treatment or control) though transparent polyethylene tubing. The
tip of the tubing was placed, nominally, 30 cm upstream of a free-ranging
adult newt. (BE) Successive images (at 3 s intervals) showing an adult
(gray arrow) detecting an attractant (arginine, at 105 mol
l1) odor plume, turning, and swimming upstream to the source
(white open circle). The principal along-channel axis of stream flow is
denoted by a white arrow.