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[{"key": "dc.contributor.advisor", "value": "Eloranta, Antti", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "\u00d8ystein Gjelland, Karl", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Kangosj\u00e4rvi, Henna", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2021-06-29T05:45:47Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2021-06-29T05:45:47Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2021", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/76888", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Ravintoverkkotutkimukset yhdist\u00e4v\u00e4t biodiversiteetin sek\u00e4 ekosysteemien toiminnan ja tarjoavat t\u00e4ten kokonaisvaltaisemman n\u00e4k\u00f6kulman suojelubiologisiin tutkimuksiin. Ravintoverkkotutkimuksissa on t\u00e4rke\u00e4 huomioida generalistien petojen kasvunaikaset ravinnonk\u00e4yt\u00f6nmuutokset sek\u00e4 niiden riippuvuus eli\u00f6yhteis\u00f6n rakenteesta ja mahdolliset vaikutukset ekosysteemin toimintaan. Tutkin Pro gradu \u2013 tutkielmassani vakaiden isotooppien analyysin sek\u00e4 sy\u00f6nn\u00f6sanalyysin avulla, miten kalayhteis\u00f6koostumus vaikuttaa nieri\u00e4n (Salvelinus alpinus) ja taimenen (Salmo trutta) kasvunaikaisiin ravinnonk\u00e4yt\u00f6n muutoksiin yhdeks\u00e4ss\u00e4 subarktisessa j\u00e4rvess\u00e4. Tulosten mukaan molemmilla lajeilla esiintyy kasvunaikaista ravinnonk\u00e4yt\u00f6n muutosta trofiatason suhteen. Kalayhteis\u00f6 vaikutti t\u00e4h\u00e4n muutokseen ainoastaan nieri\u00e4n kohdalla siten, ett\u00e4 trofiataso kasvoi pituuden suhteen allopatrisessa j\u00e4rvess\u00e4 (ainoastaan nieri\u00e4\u00e4) ja laski pituuden mukaan j\u00e4rviss\u00e4, joissa oli useampia kalalajeja, mukaan lukien taimenta. Kalayhteis\u00f6 ei vaikuttanut taimenen kasvunaikaisten ravinnonk\u00e4yt\u00f6nmuutosten suuntaan tai ajankohtaan. Tulokset havainnollistavat hyvin, kuinka ravinnonk\u00e4yt\u00f6n joustavuudeltaan eroavat lohikalat voivat reagoida eri tavoin kilpailu- ja saalistussuhteisiin j\u00e4rvien ravintoverkoissa. T\u00e4m\u00e4n vuoksi kalayhteis\u00f6koostumus sek\u00e4 alkuper\u00e4isten lohikalalajien kasvunaikaiset ravinnonk\u00e4yt\u00f6n muutokset tulisi huomioida subarktisten j\u00e4rvien suojelu- ja hoitotoimenpiteit\u00e4 suunniteltaessa.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Food-web studies integrate both biodiversity and ecosystem function and are thus a good tool for more holistic approaches in conservation biology. In food-web studies, ontogenetic niche shifts (i.e., changes in diet and habitat use as individuals grow) by generalist predators are important factors to consider in order to understand how ecological communities are structured and what affects their functioning. By using stable isotope and stomach content analyses, I investigated how fish community composition can affect the trophic niche (i.e., diet and habitat use) of Arctic charr (Salvelinus alpinus) and brown trout (Salmo trutta) in nine subarctic lakes. The results indicated ontogenetic niche shifts in trophic position for both species. However, the fish community composition affected the ontogenetic niche shifts only with charr, so that trophic position of charr increased with length in charr-only fish community and decreased with length in lakes with multiple fish species. With trout, fish community did not affect the timing or direction of ontogenetic niche shifts. The results indicate how salmonid fishes with contrasting niche plasticity may show different responses to competitive and predatory interactions within lake communities. Thus, the fish community composition and ontogenetic niche shifts by native salmonid fishes are important factors to consider when developing sustainable management and protection strategies for subarctic lakes, that are increasingly subject to multiple anthropogenic threats.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Miia Hakanen (mihakane@jyu.fi) on 2021-06-29T05:45:47Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2021-06-29T05:45:47Z (GMT). No. of bitstreams: 0\n Previous issue date: 2021", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "38", "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": "eng", "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": "diet", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "salmonid fishes", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "stable isotope analysis", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Effects of fish community composition on ontogenetic niche shifts of Arctic charr (Salvelinus alpinus) and brown trout (Salmo trutta) in subarctic lakes", "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-202106294078", "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.funding", "value": "0", "language": "", "element": "contractresearch", "qualifier": "funding", "schema": "yvv"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": null, "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "masterThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.oppiainekoodi", "value": "4012", "language": "", "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ruokinta", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "nieri\u00e4", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ravintoverkot", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ekosysteemit (ekologia)", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "taimen", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "harmaanieri\u00e4", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "isotoopit", "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": "lohikalat", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "feeding", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "char", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "food webs", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ecosystems", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "trout", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "lake trout", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "isotopes", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "fishes", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "Salmoniformes", "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", "value": "G2", "language": null, "element": "type", "qualifier": "okm", "schema": "dc"}]
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