期刊
INTERNATIONAL JOURNAL FOR PARASITOLOGY
卷 37, 期 1, 页码 61-65出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijpara.2006.09.003
关键词
Gammarus pulex; Pomphorhynchus laevis; parasitism; manipulation; predation risk; olfactory predator cues; intermediate host; parasite-induced behaviour
类别
Many parasites with complex life cycles increase the chances of reaching a final host by adapting strategies to manipulate their intermediate host's appearance, condition or behaviour. The acanthocephalan parasite Pomphorhynchus laevis uses freshwater amphipods as intermediate hosts before reaching sexual maturity in predatory fish. We performed a series of choice experiments with infected and uninfected Gammaruspulex in order to distinguish between the effects of visual and olfactory predator cues on parasite-induced changes in host behaviour. When both visual and olfactory cues, as well as only olfactory cues were offered, infected and uninfected G. pulex showed significantly different preferences for the predator or the non-predator side. Uninfected individuals significantly avoided predator odours while infected individuals significantly preferred the side with predator odours. When only visual contact with a predator was allowed, infected and uninfected gammarids behaved similarly and had no significant preference. Thus, we believe we show for the first time that P. laevis increases its chance to reach a final host by olfactory-triggered manipulation of the anti-predator behaviour of its intermediate host. (c) 2006 Australian Society for Parasitology Inc. Published by Elsevier Ltd. All rights reserved.
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