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Effekt av parasitinfektion på öringens furagering
Karlstad University, Faculty of Social and Life Sciences. (Biologi)
2011 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [sv]

Parasiter kan påverka sina värdar på många olika sätt. Flodpärlmusslans (Margaritifera margaritifera L.) glochidielarver lever inkapslade som parasiter på gälarna hos öring (Salmo trutta L.) i flera månader innan de blir frilevande. Genom experiment i ett strömakvarium har denna studie undersökt hypoteserna att öring med inkapslade gälparasiter tar färre byten, och simmar kortare avstånd när de födosöker än öring utan gälparasiter.

 

Resultaten visade att infekterad öring tog signifikant färre byten/minut än oinfekterad öring både i början och i slutet av en födosöksperiod under vilken individerna konfronterades med tvåhundra poteniella byten. Vilket visar att infekterad öring har en lägre furageringshastighet är oinfekterad öring. Däremot påvisades ingen skillnad mellan öring med och utan parasiter med avseende på antal byten tagna i förhållande till avstånd från bytet. 

 

Den lägre furageringshastigheten som påvisades hos de infekterade öringarna tyder på att infektion av flodpärlmusslans larver kan ha negativa effekter på fiskarnas tillväxt, och därmed överlevnad. Detta kan bero på faktorer som minskad aktivitet, ökad ventilation och förändringar i beteende hos de infekterade fiskarna, som är en effekt av parasitinfektionen.

Abstract [en]

 

Parasites can impact their hosts in many different ways. The larval glochida of freshwater pearl mussels (Margaritifera Margaritifera L.) infect the gills of brown trout (Salmo trutta L.), where they spend several months before becoming free-living. Using stream aquarium experiments, this study investigated the hypotheses that infected trout would capture fewer prey, and would swim less distance to capture prey, than would uninfected trout.

 

The results showed that infected brown trout caught significantly fewer prey/minute both at the beginning and at the end of a foraging period during which individuals were fed two hundred potential prey. This suggests that infected brown trout have a lower foraging rate than uninfected brown trout. However, no significant difference between infected and uninfected fish was found in terms of the number of prey taken in relation to distance to the prey.

 

The lower foraging rate for infected brown trout suggests that infection of the freshwater pearl mussel’s glochidia may have negative effects on their growth rate, and consequently survival. This may be due to factors such as reduced activity, increased ventilation and changes in behavior, which are effects from the parasite infection.

Place, publisher, year, edition, pages
2011. , 11 p.
Keyword [en]
Brown trout, Freshwater pearl mussel, Drift-feeding, Glochidia, Parasite
Keyword [sv]
Öring, Flodpärlmussla, Drift-feeding, Glochidie, Parasit
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:kau:diva-8850Local ID: BIO C-2bOAI: oai:DiVA.org:kau-8850DiVA: diva2:461177
Subject / course
Biology
Uppsok
Life Earth Science
Supervisors
Examiners
Available from: 2011-12-22 Created: 2011-12-02 Last updated: 2015-07-02Bibliographically approved

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