lnu.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Parasite against fish: A matter of life and death
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
2014 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Parasites with several intermediate hosts may face the risk of being transferred to predators other than the "right" one. Enhancing predation is a way for parasites to increase the chance of being transferred at the right time, and to the next host. In this study the behavior of the three spined stickleback (Gasterosteus aculeatus) was investigated to see if Schistocephalus solidus infection affected the sticklebacks anti-predator behavior. Two simulated predators were used, one overhead stimuli to simulate a predatory bird (a suitable host) and one side-ways stimuli, simulating a predatory fish (an unsuitable host). Infected fish showed a reduced response to both stimuli by searching for cover later than uninfected fish. The infected fish also returned sooner to relaxed swimming behavior after the simulated attack. These results suggest enhancement of predation by the parasite which is consistent with other studies of anti-predator behavior in sticklebacks. However, the effect of infection on stickleback behavior was similar for both types of attack. This suggests a general reduction in anti-predator behavior which may make the stickleback more susceptible to predation from all predators, including non-hosts. 

Abstract [sv]

Parasiter som använder sig av flertalet intermediära värdar under sin livscykel riskerar att överföras till predatorer andra än den "rätta". Genom att öka predationsrisken för värden ökar parasitens sin chans att överföras vid rätt tidpunkt och till rätt nästa värd. I denna studie har beteende hos storspigg (Gasterosteus aculeatus) studerats för att se om bandmasken Schistocephalus solidus påverkar dess predationsförsvar. Två simulerade predatorer användes, ett stimulus uppifrån för att simulera en fågelpredator (lämplig värd), och ett stimulus ifrån sidan för att simulera en fiskpredator (olämplig värd). Infekterad fisk uppvisade en reducerad respons av båda stimuli genom att uppsöka skydd senare än icke infekterad fisk. De infekterade fiskarna återgick också snabbare till avslappnat simbeteende efter en simulerad attack. Resultaten tyder på att parasiten orsakar en ökad predationsrisk hos storspigg vilket även visats i tidigare studier av predationsförsvar hos storspigg. Samma mönster kunde ses för båda stimuli vilket tyder på en generell minskning av predationsförsvaret. Minskningen gör dem därför mer utsatta för all predation, inklusive ifrån predatorer vilka ej är dess nästa värd. 

Place, publisher, year, edition, pages
2014. , p. 20
Keywords [en]
Anti-predator behavior, Schistocephalus solidus, Enhancement of predation, Simulated predation
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:lnu:diva-36680OAI: oai:DiVA.org:lnu-36680DiVA, id: diva2:742991
Subject / course
Biology
Educational program
Biology Programme, 180 credits
Supervisors
Examiners
Available from: 2014-09-10 Created: 2014-09-02 Last updated: 2014-09-10Bibliographically approved

Open Access in DiVA

No full text in DiVA

Search in DiVA

By author/editor
Eriksson, Ramona
By organisation
Department of Biology and Environmental Science
Biological Sciences

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 135 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf