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[{"key": "dc.contributor.author", "value": "Lehosmaa, Kaisa", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2014-04-14T12:07:49Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2014-04-14T12:07:49Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2014", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.other", "value": "oai:jykdok.linneanet.fi:1312862", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/43219", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "It\u00e4merennorppa (Phoca hispida botnica) on uhanalainen ja suojeltu laji It\u00e4merell\u00e4, sill\u00e4 hyljekannat romahtivat 1900-luvulla laajan mets\u00e4styksen ja ymp\u00e4rist\u00f6myrkkyjen vuoksi. Per\u00e4merell\u00e4 hyljekanta on t\u00e4ll\u00e4 hetkell\u00e4 kasvussa, ja harmaahylkeiden (Halichoerus grypus) ja it\u00e4merennorppien aiheuttamat vahingot ovat kasvaneet. Hylkeiden vuoksi kalastajat ovat menett\u00e4neet saalista. Hylkeet ovat my\u00f6s vahingoittaneet kaloja ja rikkoneet pyydyksi\u00e4. Eniten tuhoa hylkeet ovat aiheuttaneet siika- (Coregonus lavaretus (L.), kuha- (Sander lucioperca (L.) ja lohi- (Salmo salar L.) kalastukselle. Tutkimuksen tavoitteena oli tutkia 45 it\u00e4merennorpan ravintoa kahden biokemiallisen menetelm\u00e4n avulla: vakaat isotoopit ja rasvahappom\u00e4\u00e4ritys. Hiilen ja typen vakaita isotooppeja (\u03b413C ja \u03b415N) tutkittiin lihas- ja maksakudoksesta ja rasvahappokoostumus m\u00e4\u00e4ritettiin traanista. Ravintoa tutkittiin maksakudoksesta, joka m\u00e4\u00e4ritt\u00e4\u00e4 ravinnon muutaman viimeisten viikkojen ajalta ennen pyydystyst\u00e4, ja tulosta verrattiin ravintom\u00e4\u00e4rityksiin mahan\u00e4ytteist\u00e4. Lihaskudoksen isotooppiarvoista ja traanin rasvahappokoostumuksesta arvioitiin norppien ravintoa viimeisten kuukausien ajalta ennen pyydystyst\u00e4. Hylkeiden ravinto koostui p\u00e4\u00e4asiassa pelagisista kalalajeista ja pohjakaloista. Kev\u00e4\u00e4ll\u00e4 nuoret ja aikuiset hylkeet s\u00f6iv\u00e4t samankaltaista ravintoa, mutta syksyll\u00e4 aikuiset s\u00f6iv\u00e4t enemm\u00e4n petokalaryhm\u00e4n kalalajeja (36 %) verrattaessa nuoriin yksil\u00f6ihin (34 %). Biokemialliset menetelm\u00e4t m\u00e4\u00e4rittiv\u00e4t hylkeiden ravinnon koostuvan silakasta (Clupea harengus membras (L.) ja kolmipiikist\u00e4 (Gasterosteus aculeatus L.). Pohjakalat kuten kivinilkka (Zoarces viviparous) ja h\u00e4rk\u00e4simppu (Myoxocephalus quadricornis) olivat my\u00f6s hylkeiden ravintoa. \u00c4yri\u00e4isi\u00e4 hylkeet eiv\u00e4t k\u00e4ytt\u00e4neet ravinnokseen. Hylkeiden ravinnon k\u00e4ytt\u00f6 Per\u00e4merell\u00e4 ei ole yksiselitteinen. Uhanalaisen hyljelajin ravinnonk\u00e4ytt\u00f6\u00e4 tulisi tutkia enemm\u00e4n, jotta ongelmat kalatalouden kanssa voitaisiin ratkaista.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "The Baltic ringed seal (Phoca hispida botnica) is an endangered and protected species in the Baltic Sea which underwent a significant decline in the 20th century mainly due to extensive hunting and environmental toxins. The species is currently increasing its numbers in the Bothnian Bay, where damage caused to fisheries by grey seals (Halichoerus grypus) and Baltic ringed seals has also increased. Seals not only reduce the catch, but also damage fish and break fish traps. Damage has been highest for whitefish (Coregonus lavaretus (L.), zander (Sander lucioperca (L.), and salmon (Salmo salar L.) fisheries. The aim of this thesis was to study the feeding and foraging behaviour of 45 individual Baltic ringed seals to determine species-specific diet using two biochemical methods in combination: stable isotope analysis and fatty acid analysis. Carbon and nitrogen isotopes (\u03b413C and \u03b415N) were analysed from muscle and liver tissues, while fatty acid composition was determined from blubber tissues. Short-term diet (within weeks) was determined from isotopic values of liver tissue, and was compared with analyses of stomach contents. Long-term diet (within months) was analysed from isotope values of muscle tissue and fatty acid composition of blubber tissues. The ringed seal diet was concentrated on pelagic and benthic fish species on the Swedish side of the Bothnian Bay. In spring adult and juvenile seals had similar diets, but in autumn adult seals concentrated slightly more on predator fish (36 %) than juveniles (34 %). According to biochemical methods, the most common prey items for seals were Baltic herring (Clupea harengus membras (L.) and three-spined stickleback (Gasterosteus aculeatus L.). There were differences between individuals. Benthic fish species such as eelpout (Zoarces viviparous) and fourhorn sculpin (Myoxocephalus quadricornis) were also abundant in seal diets. There was no evidence of isopods being used as prey. The dietary and foraging behaviour of ringed seals is perhaps not as straightforward as previously assumed. Therefore, further research on diets of this endangered species is needed to help solve problems with fisheries while maintaining sustainable management of seals.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Kaisa Lehosmaa (kaevleho) on 2014-04-14 12:07:49.124165. 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 2014-04-14T12:07:49Z\nNo. of bitstreams: 2\nURN:NBN:fi:jyu-201404141519.pdf: 896131 bytes, checksum: 11ff8740a51c9a70e26cb8229e8cb01f (MD5)\nlicense.html: 4957 bytes, checksum: fa4dc40edb4ef8943f05afa759a085b8 (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2014-04-14T12:07:49Z (GMT). No. of bitstreams: 2\nURN:NBN:fi:jyu-201404141519.pdf: 896131 bytes, checksum: 11ff8740a51c9a70e26cb8229e8cb01f (MD5)\nlicense.html: 4957 bytes, checksum: fa4dc40edb4ef8943f05afa759a085b8 (MD5)\n Previous issue date: 2014", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "1 verkkoaineisto (43 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": "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": "biokemialliset menetelm\u00e4t", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Dietary differences between Baltic ringed seals (Phoca hispida botnica) based on stable isotope and fatty acid analyses", "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-201404141519", "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": "2014-04-14T12:07:50Z", "language": null, "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": "norppa", "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": "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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