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Fungerar den parasitiska fasen hos flodpärlmusslan (Margaritifera margaritifera) i vattendrag där musslan återintroducerats?
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
Does the parasitic phase of the freshwater pearl mussel (Margaritifera margaritifera) work in streams where the mussel has been reintroduced? (English)
Abstract [en]

Abstract

The threatened freshwater pearl mussel in many places survives in decreasing numbers in aging populations, largely due to anthropogenic impact. To solve the problems with the restoration of the mussel, one should perhaps look at both in situ and ex situ conservation. The purpose of this study was to see whether the glochidia phase of the mussel functions in the same way in reintroduced stocks as natural stocks. In order to investigate this, exploratory fishing was conducted in three watercourses, two with reintroduced mussels and one natural, during autumn (2016) and spring (2019). During electrofishing, the gills were checked on the trout (Salmo trutta) and the number of glochidia was graded in four classes. The study shows that the control water had infected fish both in autumn and spring, while the reintroduced watercourses only had infections in the autumn, but the result was not significant. With a larger number of fishes, especially in the spring, significant effects would probably have been found. Repetitive electrofishing with glochidia control could be a good way to check if the parasitic phase works with reintroduced stocks and at the same time minimize any mid-year variations.

Abstract [sv]

Sammanfattning

Den hotade flodpärlmusslan för på många håll en tynande tillvaro i åldrande bestånd, till stora delar på grund av antropogen påverkan. För att lösa problemen med musslans föryngring borde man kanske titta både på in situ och ex situ åtgärder. Syftet med undersökningen var att se om musslans glochidiefas fungerande likadant i återintroducerade bestånd som i naturliga. För att undersöka detta elfiskades tre vattendrag, två med utsatta musslor och ett med naturligt bestånd under hösten (2016) samt våren (2019). Genom elfiske kontrollerades gälarna på öringen (Salmo trutta) och antalet glochidier graderades i fyra klasser. Undersökningen visar att kontrollvattendraget hade infekterad fisk både höst och vår medan utsättningsvattendragen bara hade infektioner på hösten, resultatet var dock inte signifikant. Med ett större antal fiskar, framförallt på våren skulle troligtvis statistisk säkerhet gått att uppnå. Återkommande elfisken med glochidiekontroll skulle kunna vara ett bra sätt att kontrollera om den parasitiska fasen fungerar hos återintroducerade bestånd och motverka eventuella mellanårsvariationer.

Place, publisher, year, edition, pages
2019. , p. 13
Keywords [sv]
flodpärlmussla, glochidier, margaritifera
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:kau:diva-73261OAI: oai:DiVA.org:kau-73261DiVA, id: diva2:1333062
External cooperation
Sportfiskarna Region Väst
Subject / course
Biology
Educational program
Biology programme, 180 hp
Supervisors
Examiners
Available from: 2019-07-01 Created: 2019-06-29 Last updated: 2019-07-01Bibliographically approved

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CiteExportLink to record
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  • apa
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