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[{"key": "dc.contributor.author", "value": "Puranen, Maiju", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2016-12-02T07:34:32Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2016-12-02T07:34:32Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2016", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.other", "value": "oai:jykdok.linneanet.fi:1644058", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/52143", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Harmaahylkeiden (Halichoerus crypus) m\u00e4\u00e4r\u00e4n lis\u00e4\u00e4ntyminen on aiheuttanut viime\r\nvuosikymmenin\u00e4 voimakkaita ristiriitoja kalastuselinkeinon kanssa koko It\u00e4meren alueella.\r\nHarmaahylkeiden elinpiirej\u00e4 It\u00e4merell\u00e4 on tutkittu paljon, mutta niiden pidemmist\u00e4\r\nvaelluksista tarvitaan viel\u00e4 lis\u00e4tietoa esimerkiksi kannanhoidon suunnittelua varten. T\u00e4m\u00e4n\r\ntutkimuksen tarkoituksena oli lis\u00e4t\u00e4 tietoa harmaahylkeiden vaelluksista It\u00e4merell\u00e4 ja\r\ntarkastella vakaiden isotooppien menetelm\u00e4n soveltuvuutta harmaahylkeiden eri\r\nmerialueiden v\u00e4lisen liikkumisen selvitt\u00e4miseen. Lis\u00e4ksi t\u00e4ss\u00e4 ty\u00f6ss\u00e4 tutkittiin\r\nharmaahylkeen sukupuolen, i\u00e4n, pyyntivuodenajan ja pyydystyspaikan vaikutusta\r\nvaeltaneiden yksil\u00f6iden m\u00e4\u00e4r\u00e4\u00e4n eri merialueilla. Ty\u00f6ss\u00e4 selvitettiin 177 harmaahylkeen\r\nvaellushistoria k\u00e4ytt\u00e4en lihaskudoksesta m\u00e4\u00e4ritettyj\u00e4 hiilen (\u03b413C) ja typen (\u03b415N) vakaiden\r\nisotooppien suhteita. Vaellushistorian selvitt\u00e4misess\u00e4 k\u00e4ytettiin kullekin merialueelle\r\nsilakoiden (Clupea harengus membras) (n = 25) vakaista isotoopeista (\u03b413C ja \u03b415N)\r\nlaskettua vertailuarvoa. My\u00f6s vedyn (\u03b42H) vakaat isotoopit m\u00e4\u00e4ritettiin silakoista ja\r\nhylkeist\u00e4, mutta niiden avulla ei pystytty erottamaan harmaahylkeiden sijaintia It\u00e4merell\u00e4,\r\njoten niit\u00e4 ei sis\u00e4llytetty malliin. Harmaahylkeist\u00e4 75 % oli vaeltanut pyydystyspaikalleen\r\nmuulta It\u00e4meren alueelta kuukauden sis\u00e4ll\u00e4 ennen kuolemaansa. Vaelluksia oli tapahtunut\r\ntasaisesti kev\u00e4\u00e4n, kes\u00e4n ja syksyn aikana. Pyydyskuolleet ja pyydysten tai\r\nkalanviljelylaitosten l\u00e4helt\u00e4 mets\u00e4stetyt harmaahylkeet olivat liikkuneet tilastollisesti\r\nmerkitsev\u00e4sti v\u00e4hemm\u00e4n kuin muualta mets\u00e4stetyt yksil\u00f6t. Sen sijaan vaellusten m\u00e4\u00e4riss\u00e4\r\nei ollut tilastollisesti merkitsev\u00e4\u00e4 eroa eri ik\u00e4ryhmien tai sukupuolten v\u00e4lill\u00e4. Tutkimuksen\r\ntulokset antoivat viitteit\u00e4 siit\u00e4, ett\u00e4 It\u00e4meren harmaahylkeet tekev\u00e4t pitk\u00e4n v\u00e4limatkan\r\nsiirtymi\u00e4 luultua useammin ja my\u00f6s tyypillisten vuodenaikaisvaelluksien lis\u00e4ksi.\r\nTutkimuksessa saatiin my\u00f6s lis\u00e4viitteit\u00e4 siit\u00e4, ett\u00e4 kalanpyydyksist\u00e4 ruokailemaan\r\nerikoistuneet yksil\u00f6t ovat muita paikallisempia. Vakaiden isotooppien menetelm\u00e4n\r\nk\u00e4yt\u00f6st\u00e4 It\u00e4meren harmaahylkeiden vaellustutkimuksissa saatiin lis\u00e4tietoa, mutta t\u00e4", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "The population of Baltic Sea grey seal (Halichoerus grypus) has increased significantly\r\nduring the last two decades, further hindering the fishery in the Baltic Sea. Grey seal\r\nhomer ranges have been studied before, but large scale migration studies are also needed to\r\nassist sustainable management of the stock. The purpose of this study was to determine the\r\nproportion of studied grey seal individuals that had migrated between sea areas, and how\r\nseal sex, age, and time or cause of death affects the migration rate. The migration history\r\nof each grey seal (n = 177) was estimated from carbon and nitrogen stable isotope analysis\r\n(\u03b413C and \u03b415N) of muscle tissue. Reference values for each area of the sea were calculated\r\nfrom carbon and nitrogen stable isotope values of Baltic herring (Clupea harengus\r\nmembras) (n = 25) carbon and nitrogen stable isotope values. Hydrogen stable isotope\r\nvalues (\u03b42H) were also determined for grey seal and Baltic herring, but were not included\r\nin the data modelling due to the low discrimination ability of \u03b4\r\n2H in this case. In this study\r\n75 % of the examined grey seals had migrated from a different sea area within a month of\r\ntheir death. Migrations had taken place equally in spring, summer and autumn. Grey seals\r\nthat had drowned in fish traps or had been hunted near fish traps or fish farms had migrated\r\nless frequently than individuals that were hunted elsewhere. Age, or sex did not affect the\r\nrate of migrations between different sea areas. The results indicate that Baltic Sea grey\r\nseals make long-distance migrations more often than was previously thought, in addition to\r\ntheir known seasonal migrations. This study also provides more information about stable\r\nisotope analysis as a method for tracking Baltic grey seal migration, although the reliability\r\nof the method cannot be evaluated from these data.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Maiju Puranen (maiannpa) on 2016-12-02 07:34:31.576944. Form: Pro gradu -lomake (https://kirjasto.jyu.fi/julkaisut/julkaisulomakkeet/pro-gradu-lomake). JyX data: [jyx_publishing-allowed (fi) =True]", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by jyx lomake-julkaisija (jyx-julkaisija.group@korppi.jyu.fi) on 2016-12-02T07:34:32Z\nNo. of bitstreams: 2\nURN:NBN:fi:jyu-201612024904.pdf: 1102217 bytes, checksum: 07cd73665c810b28af9bbd784fb2d223 (MD5)\nlicense.html: 4865 bytes, checksum: ea287c608b027937e776b67624648265 (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2016-12-02T07:34:32Z (GMT). No. of bitstreams: 2\nURN:NBN:fi:jyu-201612024904.pdf: 1102217 bytes, checksum: 07cd73665c810b28af9bbd784fb2d223 (MD5)\nlicense.html: 4865 bytes, checksum: ea287c608b027937e776b67624648265 (MD5)\n Previous issue date: 2016", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "1 verkkoaineisto (38 sivua)", "language": null, "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.title", "value": "It\u00e4meren harmaahylkeiden (Halichoerus grypus) liikkumisen selvitt\u00e4minen vakaiden isotooppien menetelm\u00e4ll\u00e4", "language": null, "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-201612024904", "language": null, "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": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "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": "dc.date.updated", "value": "2016-12-02T07:34:33Z", "language": null, "element": "date", "qualifier": "updated", "schema": "dc"}, {"key": "yvv.contractresearch.funding", "value": "0", "language": null, "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": "fi", "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": null, "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "halli", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "vaellus", "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": "It\u00e4meri", "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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