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Aggressionsbeteendet mellan harr, lax och öring – potentiellpåverkan på återutsättning av lax
Karlstad University, Faculty of Health, Science and Technology (starting 2013).
2019 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
The agonistic behavior between grayling, salmon and trout – potential effectsrelated to the reintroduction of salmon (English)
Abstract [sv]

Det finns många studier på hur främmande arter påverkar en arts återinförsel, men det finns fåsom har gjorts om infödda arters påverkan. Atlantlax (Salmo salar) kunde en gång i tidenmigrera från Vänern i Sverige till Klarälven på den norska sidan. Det kan den inte idag, menidag talas det om att återinföra laxen till Klarälven i Norge så att den kan utföra hela sinmigrationsrutt igen. I den älven har laxen en gång i tiden koexisterat med sina konkurrenterharr (Thymallus thymallus), och öring (Salmo trutta) men idag är frågan hur denkonkurrensen mellan dessa tre arter kan komma att påverka återinförseln av lax. För att få enbättre bild av hur utgången för en potentiell återintroduktion kan se ut, så var syftet meddenna undersökning att ta reda på mot vilken art dessa tre arter främst riktade sinaaggressionsbeteenden mot. I akvarieförsök med juvenila individer av dessa tre arter harundersökningarna tagit plats och aggressiva beteenden filmades när arterna var i olikakombinationer. Resultatet visade att harr var den mest aktiva av de tre arterna och lax denminst aktiva, samt att lax blev dominerad utav både harr och öring. Resultatet i denna studietyder på att en återintroduktion av lax kan innehålla svårigheter, men i naturen är ett habitatmer komplext än i ett akvarium vilket kan ge ett annat resultat som kanske gör enåterintroduktion mer framgångsrik.

Abstract [en]

There are many studies about how the effects from exotic species could affect a reintroductionof a species, but there are only a few that have been made about the effects from nativespecies. The Atlantic salmon (Salmo salar) could historically speaking, migrate from lakeVänern in Sweden to the River Klarälven in Norway. Today it cannot do this, but there is anongoing discussion about reintroducing the salmon to the Norwegian side of River Klarälven,so it once again can swim along its entire migration route. In that river, the salmon used tocoexist with its competitors, grayling (Thymallus thymallus) and trout (Salmo trutta), buttoday the question is how competition between these three species could affect thereintroduction of salmon. To get a better understanding of the outcome of a possiblereintroduction, the purpose of this study was to ascertain which species these three speciesmainly directed their agonistic behavior towards. The study took place in aquariums withjuvenile individuals of the three species. Agonistic behavior was filmed when the specieswere together in different combinations. The results show that grayling is the most active ofthe three species, while salmon is the least active, and salmon was dominated by both graylingand trout. The results from this study indicates that a reintroduction of salmon might befraught with problems, but in nature a habitat is more complex than in an aquarium, whichmeans that in nature the results could be different, which might make a reintroduction moresuccessful.

Place, publisher, year, edition, pages
2019. , p. 17
Keywords [en]
agnostic behaviour, salmon, grayling, trout, competition
Keywords [sv]
aggressionsbeteende, lax, harr, öring, konkurrens
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:kau:diva-72895OAI: oai:DiVA.org:kau-72895DiVA, id: diva2:1329500
Subject / course
Biology
Educational program
Biology programme, 180 hp
Supervisors
Examiners
Available from: 2019-06-28 Created: 2019-06-24 Last updated: 2019-06-28Bibliographically approved

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