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Influence of black spot disease on shoaling behaviour in female western mosquitofish, Gambusia affinis (Poeciliidae, Teleostei)


Tobler, M; Schlupp, I (2008). Influence of black spot disease on shoaling behaviour in female western mosquitofish, Gambusia affinis (Poeciliidae, Teleostei). Environmental Biology of Fishes, 81(1):29-34.

Abstract

Parasites can fundamentally alter the
cost–benefit ratio of living in a group, e.g. if
infected individuals increase the predation risk of shoal mates. Here, the effect of an infection with a trematode, Uvulifer sp. (Diplostomatidae) on the shoaling behaviour of female western mosquitofish, Gambusia affinis, was investigated. The parasite examined causes a direct phenotypical
change of the host by forming black spots on its
body surface. When given a choice between a
stimulus shoal and no shoal, we found shoaling
tendencies to be significantly reduced in infected
focal fish. In another experiment, we tested for
association preferences relative to the infection
status of the stimulus fish. Given the choice
between an infected and a healthy stimulus fish,
both infected and healthy focal fish preferred to
associate with non-infected stimulus fish. Our
results suggest that (1) the cost–benefit ratio of
shoaling might be different for infected and noninfected individuals. Infected fish may be more
affected by competition for food within a shoal.
(2) Associating with infected conspecifics appears
to be costly for female mosquitofish, maybe due
to increased predation risk.

Abstract

Parasites can fundamentally alter the
cost–benefit ratio of living in a group, e.g. if
infected individuals increase the predation risk of shoal mates. Here, the effect of an infection with a trematode, Uvulifer sp. (Diplostomatidae) on the shoaling behaviour of female western mosquitofish, Gambusia affinis, was investigated. The parasite examined causes a direct phenotypical
change of the host by forming black spots on its
body surface. When given a choice between a
stimulus shoal and no shoal, we found shoaling
tendencies to be significantly reduced in infected
focal fish. In another experiment, we tested for
association preferences relative to the infection
status of the stimulus fish. Given the choice
between an infected and a healthy stimulus fish,
both infected and healthy focal fish preferred to
associate with non-infected stimulus fish. Our
results suggest that (1) the cost–benefit ratio of
shoaling might be different for infected and noninfected individuals. Infected fish may be more
affected by competition for food within a shoal.
(2) Associating with infected conspecifics appears
to be costly for female mosquitofish, maybe due
to increased predation risk.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Zoology (former)
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
Uncontrolled Keywords:Group living, Predation, Parasites, Uvulifer, Fish behaviour
Language:English
Date:2008
Deposited On:11 Feb 2008 12:17
Last Modified:18 Feb 2018 09:24
Publisher:Springer
ISSN:0378-1909
OA Status:Closed
Publisher DOI:https://doi.org/10.1007/s10641-006-9153-x

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