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Does Schistocephalus solidus infection affect the temperature and light preference of its intermediate host the three-spined stickleback (Gasterosteus aculeatus)?
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
2020 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The three-spined stickleback (Gasterosteus aculeatus) and the parasitic tapeworm Schistocephalus solidus are well-studied subjects for studies of host-parasite interactions. Previous studies show that S. solidus infection cause three-spined sticklebacks to seek out shallow water and water close to the surface. This kind of host manipulation is thought to increase S. solidus chances of transmission to their definitive host, a piscivorous bird. The mechanism behind this manipulation is unknown, that is, how S. solidus entices the three-spined sticklebacks to seek out shallow, inshore waters. The aim of this study was to find out if this is achieved by altering the light and temperature preferences of the three-spined stickleback through laboratory experiments. An arena with a light gradient was used for the light preference experiments. An arena where the sticklebacks could choose between colder and warmer temperatures was used for the temperature preference experiment. My results indicate that infected three-spined sticklebacks preferred darker areas and moved less than uninfected individuals. No difference in temperature preference was observed but the results of the experiment should be interpreted carefully since few individuals were infected. Experiments under more natural conditions and field studies are suggested to gain more knowledge on S. solidus host manipulations.

Place, publisher, year, edition, pages
2020. , p. 18
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:lnu:diva-96284OAI: oai:DiVA.org:lnu-96284DiVA, id: diva2:1441485
Subject / course
Biology
Educational program
Biology Programme, 180 credits
Supervisors
Examiners
Available from: 2020-06-16 Created: 2020-06-16 Last updated: 2020-06-16Bibliographically approved

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Citation style
  • apa
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