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Growth rate and retention of learned predator cues by juvenile rainbow trout: faster-growing fish forget sooner

Title:

Growth rate and retention of learned predator cues by juvenile rainbow trout: faster-growing fish forget sooner

Brown, Grant E. and Ferrari, Maud C. O. and Malka, Patrick H. and Oligny, Marie-Anne and Romano, Matthew and Chivers, Douglas P. (2011) Growth rate and retention of learned predator cues by juvenile rainbow trout: faster-growing fish forget sooner. Behavioral Ecology and Sociobiology, 65 (6). pp. 1267-1276. ISSN 0340-5443

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Official URL: http://dx.doi.org/10.1007/s00265-011-1140-3

Abstract

Under conditions of spatial and/or temporal variability in predation risk, prey organisms often rely on acquired predator recognition to balance the trade-offs between energy intake and risk avoidance. The question of ‘for how long’ should prey retain this learned information is poorly understood. Here, we test the hypothesis that the growth rate experienced by prey should influence the length of the ‘memory window’. In a series of laboratory experiments, we manipulated growth rate of juvenile rainbow trout and conditioned them to recognize a novel predator cue. We subsequently tested for learned recognition either 24 h or 8 days post-conditioning. Our results suggest that trout with high versus low growth rates did not differ in their response to learned predator cues when tested 24 h post-conditioning. However, trout on a high growth rate exhibited no response to the predator cues after 8 days (i.e. did not retain the recognition of the predator odour), whereas trout on a lower growth rate retained a strong recognition of the predator. Trout that differed in their growth rate only after conditioning did not differ in their patterns of retention, demonstrating growth rate after learning does not influence retention. Trout of different initial sizes fed a similar diet (percent body mass per day) showed no difference in retention of the predator cue. Together, these data suggest that growth rate at the time of conditioning determines the ‘memory window’ of trout. The implications for threat-sensitive predator avoidance models are described.

Divisions:Concordia University > Faculty of Arts and Science > Biology
Item Type:Article
Refereed:Yes
Authors:Brown, Grant E. and Ferrari, Maud C. O. and Malka, Patrick H. and Oligny, Marie-Anne and Romano, Matthew and Chivers, Douglas P.
Journal or Publication:Behavioral Ecology and Sociobiology
Date:18 January 2011
Keywords:Acquired predator recognition – Memory window – Antipredator behaviour – Salmonids – Growth rate – Trade-offs
ID Code:7634
Deposited By:DANIELLE DENNIE
Deposited On:06 Jun 2011 11:08
Last Modified:06 Jun 2011 11:08
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