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[{"key": "dc.contributor.advisor", "value": "Taipale, Sami", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Ventel\u00e4, Anne-Mari", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Anttila, Lauri", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2020-04-06T09:46:47Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2020-04-06T09:46:47Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2019", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/68467", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Omega-3 rasvahapot ovat kaikille el\u00e4imille fysiologisesti v\u00e4ltt\u00e4m\u00e4tt\u00f6mi\u00e4. Ihmisen\nterveydelle hy\u00f6dyllisimpi\u00e4 omega-3 rasvahappoja ovat pitk\u00e4ketjuiset\neikosapentaeenihappo (EPA) ja dokosaheksaeenihappo (DHA), joita j\u00e4rvien\nkasviplanktonlev\u00e4t valmistavat entsyymiavusteisesti. Erityisesti kirkasvetisiss\u00e4 j\u00e4rviss\u00e4\nviihtyv\u00e4t kulta-, panssarisiima-, pii- ja nielulev\u00e4t pystyv\u00e4t valmistamaan runsaasti\nEPA:a ja DHA:ta. El\u00e4inplanktonin, kalojen ja muiden kuluttajien kyky muuntaa\nlyhytketjuisia rasvahappoja pitk\u00e4ketjuisiksi on havaittu heikoksi, ja siten kuluttajat ovat\nriippuvaisia levien rasvahappotuotannosta. Kalat ovat ihmiselle t\u00e4rkein linkki\nakvaattiseen ravintoverkkoon ja siten korvaamaton pitk\u00e4ketjuisten omega-3\nrasvahappojen l\u00e4hde. Viimeaikaisissa tutkimuksissa on havaittu ahvenen (Perca\nfluviatilis) EPA- ja DHA-pitoisuuksien vaihtelevan voimakkaasti erityyppisten j\u00e4rvien\nv\u00e4lill\u00e4. Aiempi tutkimus on kuitenkin keskittynyt kookkaimpiin yksil\u00f6ihin, joiden\nravinto koostuu p\u00e4\u00e4asiassa kalaravinnosta. Ahvenen ravinnonk\u00e4ytt\u00f6 muuttuu\nkasvukehityksen my\u00f6t\u00e4. Poikasvaiheessa se sy\u00f6 el\u00e4inplanktonia, josta v\u00e4hitellen siirtyy\npohjael\u00e4imiin ja edelleen kaloihin. Yksil\u00f6n kehitysvaiheen ja j\u00e4rven rehevyyden\nvaikutusta ahvenen rasvahappokoostumukseen tutkittiin rehev\u00e4n ja keskiravinteisen\nlounaissuomalaisen j\u00e4rven ahvenpopulaatioita vertailemalla. J\u00e4rvien ravintoverkon\nlaatua seurattiin yhden kes\u00e4n ajan s\u00e4\u00e4nn\u00f6llisill\u00e4 kasviplankton- ja\nel\u00e4inplanktonn\u00e4ytteill\u00e4. Lis\u00e4ksi kertaluonteisella n\u00e4ytteenotolla tutkittiin\nsurviaiss\u00e4\u00e4sken toukkien rasvahappokoostumusta. Tutkimuksessa ahventen\nkehitysvaiheen mittarina k\u00e4ytettiin kalan ik\u00e4\u00e4 ja pituutta. Lis\u00e4ksi ahventen sijaintia\nravintoketjussa arvioitiin typen vakaan isotoopin (15N) m\u00e4\u00e4rityksill\u00e4.\nRasvahappokoostumuksen ja lipidiprosentin m\u00e4\u00e4ritt\u00e4miseksi ahvenilta otettiin\nlihasn\u00e4yte selk\u00e4ev\u00e4n juuresta. Rehev\u00e4n j\u00e4rven ahventen havaittiin sis\u00e4lt\u00e4v\u00e4n\nv\u00e4hemm\u00e4n terveydelle hy\u00f6dyllisi\u00e4 omega-3 rasvahappoja (EPA+DHA) kaikissa yksil\u00f6n\nkehitysvaiheissa. Ahvenen lihaksen rasvahappojen suhteellisissa osuuksissa ei\nkuitenkaan havaittu j\u00e4rvien v\u00e4lisi\u00e4 eroa. Keskiravinteisen j\u00e4rven ahvenet olivat\nkokonaisuudessaan rehev\u00e4n j\u00e4rven ahvenia rasvaisempia, jolloin my\u00f6s omega-3\nrasvahappojen pitoisuus oli suurempi. Lis\u00e4ksi havaittiin kaikkein pienimpien ahventen\nolevan rasvahappokoostumukseltaan terveellisint\u00e4 ravintoa, sill\u00e4 ahventen EPA+DHA\n-pitoisuus korreloi negatiivisesti pituuskasvun kanssa.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Omega-3 fatty acids are physiologically essential for animals. The healthiest omega-3\nfatty acids for humans are long-chain eicosapentaenoic acid (EPA) and docosahexaenoic\nacid (DHA), which are synthetized by aquatic algae. Especially chrysophytes,\ndinoflagellates, cryptophytes and diatoms have good ability to synthetize long-chain\nomega-3 fatty acids. The ability of zooplankton, fish and other consumers to convert\nshort-chain fatty acids to EPA and DHA has been found to be weak and thus consumers\nare depending on fatty acid production of algae. Fish are the most important link\nbetween aquatic food webs and humans and thus also invaluable source of omega-3\nfatty acids. Recent studies have shown that the nutritional value of Eurasian perch (Perca\nfluviatilis) varies greatly between different types of lakes. However, the research has\nmainly focused on the piscivorous individuals. Perch have ontogenic dietary change.\nYoung perch eats zooplankton, from which it is gradually transferred to benthic animals\nand further to fish. In this thesis the effects of the developmental stage of individual and\neutrophication of the lake to fatty acid composition of the perch was studied by\ncomparing the perch populations of eutrophic and mesotrophic lakes in southwest\nFinland. The quality of the food web of the lakes was monitored during one summer\nwith regular phytoplankton and zooplankton samples. Additionally Chironomidae\nlarvae was sampled once. In this study, the age and length of the fish were used as a\nmeasure of the developmental stage of perch. In addition, the location of the perch in\nthe food chain was estimated by determining a stable isotope of nitrogen (15N). Dorsal\nmuscle sample was taken to analyze the fatty acid and lipid composition of the perch.\nPerch in eutrophic lake were found to contain less health beneficial omega-3 fatty acids\n(EPA + DHA) at all developmental stages than in less productive lake. However, the\nrelative proportions of fatty acids did not exactly distinguish between lakes, but the\nperch in the mesotrophic lake had higher lipid percent than the perch of the eutrophic\nlake. Because of this, the concentration of omega-3 fatty acids were also higher. In\naddition, EPA and DHA consentrations of the perch was found to decrease with size,\nso that the smallest perch had the most nutritious fatty acid composition.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2020-04-06T09:46:47Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2020-04-06T09:46:47Z (GMT). No. of bitstreams: 0\n Previous issue date: 2019", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "64", "language": "", "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "schema": "dc"}, {"key": "dc.language.iso", "value": "fin", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "omega-3 rasvahapot", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "J\u00e4rven rehevyyden vaikutus ahvenen (Perca fluviatilis) eri kehitysvaiheiden omega-3 rasvahappokoostumukseen", "language": "", "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-202004062680", "language": "", "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Bio- ja ymp\u00e4rist\u00f6tieteiden laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Biological and Environmental Science", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Akvaattiset tieteet", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Aquatic sciences", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "yvv.contractresearch.collaborator", "value": "business", "language": "", "element": "contractresearch", "qualifier": 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"element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "rehev\u00f6ityminen", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ahven", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "kalat", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ravinto", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "lipidit", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.format.content", "value": "fulltext", "language": null, "element": "format", "qualifier": "content", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": "dc.type.okm", 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