| fullrecord |
[{"key": "dc.contributor.author", "value": "M\u00e4ntt\u00e4ri, Viivi", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2011-09-09T11:39:32Z", "language": "", "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2011-09-09T11:39:32Z", "language": "", "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2011", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.other", "value": "oai:jykdok.linneanet.fi:1182879", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/36665", "language": "", "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "It\u00e4meren alueen hyljekannat ovat hiljalleen toipuneet 1900-luvun liikapyynnin ja ymp\u00e4rist\u00f6myrkkyjen aiheuttamasta kannanromahduksesta. Hallien ja it\u00e4merennorppien kannat ovat olleet nousussa l\u00e4hes koko 2000-luvun ajan. Hylkeiden m\u00e4\u00e4r\u00e4n lis\u00e4\u00e4ntymisen my\u00f6t\u00e4 my\u00f6s ammattikalastajien hyljevahingot ovat lis\u00e4\u00e4ntyneet. Kalastajat v\u00e4itt\u00e4v\u00e4t elinkeinonsa olevan uhattuna, koska hylkeet vahingoittavat lohipyydyksi\u00e4, sy\u00f6v\u00e4t saalista rysist\u00e4 ja kilpailevat kalastajien kanssa samoista v\u00e4h\u00e4isist\u00e4 lohista. Tarkkaa tietoa lohien ja taimenten osuudesta tai osuuden ajallisesta vaihtelusta hylkeiden ravinnonk\u00e4yt\u00f6ss\u00e4 ei kuitenkaan ole. T\u00e4ss\u00e4 tutkimuksessa selvitettiin hallien (Halichoerus grypus) (n=63) ja norppien (Phoca hispida botnica) (n=37) ravinnonk\u00e4ytt\u00f6\u00e4 Per\u00e4merell\u00e4 ja erityisesti sit\u00e4, kuinka suuri osa ravinnosta koostuu lohesta (Salmo salar) ja taimenesta (Salmo trutta) ja onko ravinnonk\u00e4yt\u00f6ss\u00e4 ajallista vaihtelua. Ravinnonk\u00e4ytt\u00f6\u00e4 arvioitiin hylkeiden eri kudosten (plasma-, maksa- ja lihaskudos) hiilen ja typen vakaiden isotooppien arvoista (\u03b413C ja \u03b415N) m\u00e4\u00e4ritettyjen ravinto-osuuksien perusteella. Tuloksia verrattiin Riista- ja kalatalouden tutkimuslaitoksen tekemiin ravintom\u00e4\u00e4rityksiin hylkeiden mahojen ja suolistojen sis\u00e4ll\u00f6st\u00e4. Halleilla ravinnonk\u00e4yt\u00f6ss\u00e4 oli vaihtelua sek\u00e4 sukupuolen ett\u00e4 eri-ik\u00e4isten yksil\u00f6iden v\u00e4lill\u00e4. T\u00e4ss\u00e4 tutkimuksessa m\u00e4\u00e4ritetyt ravinto-osuudet paljastivat tiettyjen vanhojen hallien k\u00e4ytt\u00e4v\u00e4n ravinnokseen lohta ja taimenta erityisesti alkukes\u00e4st\u00e4, jolloin n\u00e4iden lajien m\u00e4\u00e4r\u00e4 Per\u00e4meren alueella on suuri. Tulosta tukivat my\u00f6s hallien ruoansulatuskanavasta l\u00f6ytyneet lohien ja taimenien j\u00e4\u00e4nteet. Ylemm\u00e4n ravintoverkkotason lajeihin kuuluvan lohen, taimenen ja h\u00e4rk\u00e4simpun (Myoxocephalus quadricornis) osuus hallien ravinnossa oli 53 % kes\u00e4-hein\u00e4kuussa, kun se keskim\u00e4\u00e4rin kev\u00e4\u00e4n ja syksyn v\u00e4lill\u00e4 oli 39 %. Per\u00e4meren parvikalojen, kuten silakan (Clupea harengus membras) ja muikun (Coregonus albula), t\u00e4rkeys korostui molemmilla hyljelajeilla, sill\u00e4 ne muodostivat merkitt\u00e4v\u00e4n osuuden (40\u201360 %) ravinnosta kaikkina kuukausina. Eri-ik\u00e4iset ja eri sukupuolta olevat norpat k\u00e4yttiv\u00e4t hyvin samanlaista ravintoa kaikkina kuukausina. T\u00e4ss\u00e4 tutkimuksessa norppien ei havaittu k\u00e4ytt\u00e4v\u00e4n lohta tai taimenta ravintonaan, eik\u00e4 yhdenk\u00e4\u00e4n norpan mahasta l\u00f6ytynyt j\u00e4\u00e4nteit\u00e4 n\u00e4iden kalalajien sy\u00f6nnist\u00e4. Norpille alemman ravintoverkkotason lajit, kuten kilkki (Saduria entomon) ja kolmipiikki (Gasterostreus aculeatus), ovat t\u00e4rkeit\u00e4 saaliskohteita. T\u00e4m\u00e4 tutkimus on tuonut uutta tietoa ja vahvistanut aiempia k\u00e4sityksi\u00e4 hylkeiden ravinnonk\u00e4yt\u00f6st\u00e4. Tulokset tulisi pyrki\u00e4 ottamaan huomioon tulevaisuudessa hylkeiden kannanhoitoa suunniteltaessa.", "language": "", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Viivi M\u00e4ntt\u00e4ri (vilemant) on 2011-09-09 11:39:32.361845. Form: Pro gradu -lomake (1 tekij\u00e4) (https://kirjasto.jyu.fi/julkaisut/julkaisulomakkeet/pro-gradu-lomake-1-tekijae). JyX data:", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by jyx lomake-julkaisija (jyx-julkaisija@noreply.fi) on 2011-09-09T11:39:32Z\r\nNo. of bitstreams: 2\r\nURN:NBN:fi:jyu-2011090911377.pdf: 381886 bytes, checksum: 3b3d108e42c9e651cd9618c39ad883d1 (MD5)\r\nlicense.html: 5045 bytes, checksum: faa71a9371afbfd5f5aa026691098a28 (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2011-09-09T11:39:32Z (GMT). No. of bitstreams: 2\r\nURN:NBN:fi:jyu-2011090911377.pdf: 381886 bytes, checksum: 3b3d108e42c9e651cd9618c39ad883d1 (MD5)\r\nlicense.html: 5045 bytes, checksum: faa71a9371afbfd5f5aa026691098a28 (MD5)\r\n Previous issue date: 2011", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "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.subject.other", "value": "ajallinen vaihtelu", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "hylje", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "lohenkalastus", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "ravintom\u00e4\u00e4ritys", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Salmo salar", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Salmo trutta", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "vakaat isotoopit", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Hallien (halichoerus grypus) ja it\u00e4merennorppien (phoca hispida botnica) ravinnonk\u00e4ytt\u00f6 Per\u00e4merell\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-2011090911377", "language": null, "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.dcmitype", "value": "Text", "language": "en", "element": "type", "qualifier": "dcmitype", "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": "2011-09-09T11:39:33Z", "language": "", "element": "date", "qualifier": "updated", "schema": "dc"}, {"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": "hylje-el\u00e4imet", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "hylkeet", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "kalastus", "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": "isotoopit", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "lohi", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "Per\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"}]
|