Skip to main content

Chemically mediated learning in juvenile rainbow trout. Does predator odour pH influence intensity and retention of acquired predator recognition?

Buy Article:

$51.00 plus tax (Refund Policy)


The prediction that variability in ambient pH will influence the intensity and retention of learned predator recognition in juvenile rainbow trout Oncorhynchus mykiss was tested under laboratory conditions. Juvenile rainbow trout were conditioned to recognize the odour of a novel predator at pH 6·0 or 7·0 and then tested for learned recognition of the predator odour at pH 6·0 or 7·0 at 2 or 7 days post-conditioning. When tested 2 days post-conditioning, rainbow trout exhibited a significant learned antipredator response regardless of predator odour pH. The response was stronger, however, when the test pH matched the conditioning pH. When tested 7 days post-conditioning, rainbow trout only exhibited a learned response when conditioning and testing pH were the same. These results demonstrate that episodic acidification may impair the strength and retention of acquired predator recognition learning. Given the demonstrated survival benefits associated with learned predator recognition in prey fishes, such impairment will probably have considerable negative impacts at both individual and population levels.

Keywords: acid rain; acquired predator recognition; antipredator behaviour; episodic acidification; predator–prey dynamics; rainbow trout

Document Type: Regular Paper


Affiliations: Department of Biology, Concordia University, 7141 Sherbrooke Street O., Montréal, Quebéc, H4B 1R6 Canada

Publication date: May 1, 2008


Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more