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dc.contributor.advisorKiljunen, Mikko
dc.contributor.advisorTaskinen, Jouni
dc.contributor.advisorHajisafarali, Mahsa
dc.contributor.authorNykänen, Sabrina
dc.date.accessioned2021-06-21T08:47:47Z
dc.date.available2021-06-21T08:47:47Z
dc.date.issued2021
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/76737
dc.description.abstractEarlier studies have suggested effect of land use on freshwater pearl mussel (FPM) via the detrimental impact of siltation on juvenile mussels, but little is known about its effects through the changes in food quality. Moreover, the relative role of autochthonous and allochthonous food source of FPM is largely unstudied. Therefore, the aim of this study was to investigate relationship between food source and performance of adult FPM, with the hypothesis that condition of mussels would correlate positively with the availability of autochthonous food. The mean shell opening resistance (SOR) and FPM density were used as indicators of the condition of the populations in 14 northern Finnish rivers. The diet of FPM was studied by analyzing stable isotope ratios (δ13C, δ15N, and δ2H) of the mussel foot tissue and the potential food sources. The contribution of autochthonous and allochthonous sources in the diet of FPM and its connection to the condition of the populations were examined with Bayesian mixing models. There was markable variation in the autochthonous source signal between the rivers, which may possibly be explained with the higher terrestrial organic matter contribution in the lake fine particulate organic matter in southern rivers. Mixing model medians suggested overall dominance of autochthonous sources in diet of FPM. Mixing model with mean SOR as a continuous effect explained best the variation in FPM diet, so that there was surprisingly a tendency of allochthonous contribution to increase with SOR, suggesting a possible positive association between condition of FPM and the proportion of allochthonous sources in the diet. Further studies are still needed to understand the relationship between food sources and condition of FPM, and the possible effect of land use on FPM via changes on food quality, but the present study suggests that although autochthonous sources largely dominate, the allochthonous food sources in diet of FPM can be of high importance for the performance of the individuals.en
dc.format.extent66
dc.language.isoen
dc.subject.otherallochthony
dc.subject.otherautochthony
dc.subject.otherstable isotope analysis
dc.subject.othermargaritifera
dc.subject.othermixing model
dc.titleEffect of primary dietary sources and environmental variables on the condition of freshwater pearl mussel (Margaritifera margaritifera) populations
dc.identifier.urnURN:NBN:fi:jyu-202106213930
dc.type.ontasotMaster’s thesisen
dc.type.ontasotPro gradu -tutkielmafi
dc.contributor.tiedekuntaMatemaattis-luonnontieteellinen tiedekuntafi
dc.contributor.tiedekuntaFaculty of Sciencesen
dc.contributor.laitosBio- ja ympäristötieteiden laitosfi
dc.contributor.laitosDepartment of Biological and Environmental Scienceen
dc.contributor.yliopistoJyväskylän yliopistofi
dc.contributor.yliopistoUniversity of Jyväskyläen
dc.contributor.oppiaineAkvaattiset tieteetfi
dc.contributor.oppiaineAquatic sciencesen
dc.rights.copyrightJulkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty.fi
dc.rights.copyrightThis publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited.en
dc.contributor.oppiainekoodi4012
dc.subject.ysosimpukat
dc.subject.ysojokihelmisimpukka
dc.subject.ysopopulaatiot
dc.subject.ysobivalvia
dc.subject.ysoMargaritana margaritifera
dc.subject.ysopopulations
dc.rights.accessrightsTekijä ei ole antanut lupaa avoimeen julkaisuun, joten aineisto on luettavissa vain Jyväskylän yliopiston kirjaston arkistotyösemalta. Ks. https://kirjasto.jyu.fi/kokoelmat/arkistotyoasema..fi
dc.rights.accessrightsThe author has not given permission to make the work publicly available electronically. Therefore the material can be read only at the archival workstation at Jyväskylä University Library (https://kirjasto.jyu.fi/collections/archival-workstation).en


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