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dc.contributor.supervisor Goater, Cameron James, Clayton University of Lethbridge. Faculty of Arts and Science 2008-09-25T20:07:51Z 2008-09-25T20:07:51Z 2008
dc.description 105 leaves : ill. ; 29 cm. en
dc.description.abstract Parasites exert substantial costs on their hosts. Thus, natural selection should favour behavioural defenses that reduce hosts’ exposure to parasites. This prediction has rarely been tested for aquatic hosts exposed to parasites. I designed experiments to test if fathead minnows could detect cercariae of the trematode, Ornithodiplostomum sp. and engage in antiparasite behaviours to avoid them. Minnows exposed to cercariae formed 20.1% tighter shoals compared to water controls. Further, minnows greatly reduced their overall activity, but only when they were exposed for a second time. The latter result is important because it provides the first indication that hosts can learn to avoid parasites. Lastly, I tested if epidermal club cells play a defensive role against cercariae. Club cells did not, but other components of the epidermis, probably mucus cells, decreased cercarial infectivity by 61-68%. My results show that fish can detect, learn, and ultimately avoid aquatic larval stages of parasites. en
dc.language.iso en_US en
dc.publisher Lethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 2008 en
dc.relation.ispartofseries Thesis (University of Lethbridge. Faculty of Arts and Science) en
dc.subject Dissertations, Academic en
dc.subject Fathead minnows -- Parasites en
dc.subject Cercariae en
dc.title Antiparasite defenses of fathead minnows exposed to trematode cercariae en
dc.type Thesis en
dc.publisher.faculty Arts and Science en
dc.publisher.department Department of Biological Sciences en Masters

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