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Flodpärlmusslans (Margaritifera margaritifera9 effekt på öringens (Salmo trutta) rörelser, habitatval och tillväxt
Karlstad University, Faculty of Health, Science and Technology (starting 2013).
2016 (Swedish)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
The effect of the freshwater pearl mussel (Margaritifera margaritifera) on movement, habitat choice, and growth of brown trout (Salmo trutta) (English)
Abstract [sv]

Fiskar kan drabbas av många olika parasiter tillhörande ett brett spektrum av organismgrupper. Parasiter kan påverka värdens fysiologi, morfologi och beteende, vilket kan ha negativa effekter på värden.  Den starkt hotade flodpärlmusslan (Margaritifera margaritifera) parasiterar under sitt tidiga liv som glochidielarver på fiskgälar, i Sverige främst på öringen (Salmo trutta). I tidigare studier har man sett såväl negativa som inga effekter av parasiteringen på värdfisken. Syftet med min studie var att undersöka effekten av musslans parasitering på öringens rörelse, habitatval och tillväxt i Älgån i Arvika kommun, Värmland. Resultaten visade att höginfekterad öring förflyttade sig längre sträckor och hade lägre tillväxt än låginfekterad öring. Det var ingen skillnad mellan hög- och låginfekterade öringars habitatval med avseende på djup, vattenhastighet eller substrat. Sammanfattningsvis kan höginfekterade öringar ha högre mortalitetsrisk än låginfekterade, lägre tillväxt och sämre konkurrensförmåga, vilket kan ha negativa konsekvenser för musslans rekryteringsframgång. 

Abstract [en]

Fish are affected by various parasites, belonging to many different taxonomic groups. Parasites can affect the host’s physiology, morphology, and behaviour, which may have negative effects for the host. The critically endangered freshwater pearl mussel (Margaritifera margaritifera) lives parasitically as glochidia larvae on the gills of fish, and in Sweden this occurs mainly in the gills of brown trout (Salmo trutta). During their parasitic stage, which lasts for almost one year, the mussel grows up to four or five times their initial size.  Previous studies have reported both negative and no effects of the parasite on the host fish. The aim of my study was to analyse the effect of the freshwater pearl mussel parasitation on the brown trout’s movement, habitat choice, and growth in the stream Älgån in Arvika municipalty, Värmland. The results show that highly infected brown trout moved greater distances and had lower growth than less infected trout. There was no difference in habitat choice in terms of depth, velocity, or substrate between high or low infected trout. In summary, highly infected trout may have high energy costs, low growth, and poor competitive ability, which can have negative consequences for the mussel’s recruitment.            

Place, publisher, year, edition, pages
2016. , 16 p.
Keyword [en]
Freshwater pearl mussel, brown trout, parasitism, glochidia larvae, effect, movement, habitat choice, growth rate
Keyword [sv]
Flodpärlmussla, öring, parasitism, glochidielarver, effekt, rörelser, habitatval, tillväxt
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:kau:diva-41973OAI: oai:DiVA.org:kau-41973DiVA: diva2:926152
Subject / course
Biology
Educational program
Master Programme in Biology with specialisation in Stream Ecology, 120 hp
Supervisors
Examiners
Available from: 2016-05-11 Created: 2016-05-04 Last updated: 2016-05-11Bibliographically approved

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