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Fig. 4. Proportion of motivated whelks that successfully tracked prey chemicals in each flow condition. Success rates were independent of flow treatment for both unobstructed and obstructed flows (P>0.25). (A) Sample sizes for the four unobstructed treatments of 1.5, 5, 10 and 15 cm s–1 were 17, 19, 19 and 16, respectively. (B) Sample sizes for the bump and cylinder obstruction treatments (at U=5 cm s–1) were 14 and 17, respectively. No animals in any flow treatment tracked to the delivery nozzle in response to unscented control plumes.





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