| fullrecord |
[{"key": "dc.contributor.advisor", "value": "Marjom\u00e4ki, Timo", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Kiljunen, Mikko", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Sepp\u00e4nen, Markku", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2021-01-26T06:38:15Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2021-01-26T06:38:15Z", "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/123456789/73796", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Yl\u00e4-Lapin tunturivesien h\u00e4vinneit\u00e4 rautukantoja (Salvelinus alpinus (L.) on elvytetty 1980-luvun lopulta alkaen pyyt\u00e4m\u00e4ll\u00e4 luonnonvaraisia rautuja ja istuttamalla niit\u00e4 j\u00e4rviin, joista rautukanta on h\u00e4vinnyt. T\u00e4ss\u00e4 tutkimuksessa selvitettiin Vadaid Ravdoj\u00e4rvest\u00e4 pyydetyn ja Stuorra Ravdoj\u00e4rveen istutetun rautukannan tilaa ja kalastojen runsaussuhteita verkkokoekalastuksilla. Stuorra Ravdoj\u00e4rven veden l\u00e4mp\u00f6tilaa seurattiin nelj\u00e4n vuoden ajan. Istutuskalojen kasvua, ik\u00e4\u00e4 ja sukukypsyyden saavuttamista verrattiin pyyntij\u00e4rven rautujen kasvuun. Ravinnon k\u00e4ytt\u00f6\u00e4 selvitettiin mahan\u00e4ytteiden ja hiilen ja typen pysyvien isotooppien avulla. Stuorra Ravdoj\u00e4rvess\u00e4 veden l\u00e4mp\u00f6tila kohosi raudulle kriittisen\u00e4 pidetyn 22 \u00b0C yli 8 p\u00e4iv\u00e4n\u00e4 vuonna 2018. M\u00e4dille ja vastakuoriutuneille letaali l\u00e4mp\u00f6tilaraja 8 \u00b0C saavutettiin keskim\u00e4\u00e4rin 12 vuorokauden kuluttua j\u00e4iden l\u00e4htemisest\u00e4. Istutusj\u00e4rvess\u00e4 rautu saavutti suuremman koon verrattuna pyyntij\u00e4rven rautuihin. Stuorra Ravdoj\u00e4rven alkuper\u00e4iseen kalastoon kuuluvat taimen (Salmo trutta) ja made (Lota lota) siirtyiv\u00e4t k\u00e4ytt\u00e4m\u00e4\u00e4n kalaravintoa 20\u201230 cm:n pituisena. Sen sijaan rautu k\u00e4ytti ravintonaan pohjael\u00e4imi\u00e4 ja el\u00e4inplanktonia. Raudun nuorten ik\u00e4ryhmien puuttuminen istutusj\u00e4rvess\u00e4 viittaa siihen, ett\u00e4 lis\u00e4\u00e4ntyminen ei todenn\u00e4k\u00f6isesti onnistu. Todenn\u00e4k\u00f6inen syy on taimenen ja mateen rautuun kohdistama predaatio. Toinen mahdollinen syy raudun lis\u00e4\u00e4ntymisen ep\u00e4onnistumiseen voi olla liian korkea veden l\u00e4mp\u00f6tila.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "The depleted populations of Arctic charr in the highland waters of Northern Lapland have been resuscitated since the late 1980s by catching wild Arctic charr and stocking them into the lakes that no longer have such fish. This study analysed the status of the Arctic charr population that was caught from Lake Vadaid Ravdoj\u00e4rvi and stocked into Lake Stuorra Ravdoj\u00e4rvi. The fish populations of these two lakes and their abundance ratios were analysed through exploratory fishing with gillnets. The water temperature of Stuorra Ravdoj\u00e4rvi was observed for a period of four years. The growth, the age and the sexual maturation of the stocked fish were compared to the growth of the Arctic charr in the catch lake Vadaid Ravdoj\u00e4rvi. The diets of the fish were studied using stomach samples and stable isotopes of carbon and nitrogen. In Stuorra Ravdoj\u00e4rvi, the water temperature exceeded the 22\u00b0C that is considered critical for Arctic charr on 8 days in 2018. The temperature limit 8\u00b0C that is lethal for the spawn and the fry was reached on an average 12 days after the breakup of ice. The charr attained a bigger size in the receiving lake than in the catch lake. The brown trout (Salmo trutta) and the burbot (Lota lota) that were the other original fish populations of Stuorra Ravdoj\u00e4rvi shifted to feeding on fish of the size 20\u201330 cm, while the Arctic charr relied on zoobenthos and zooplankton. The lack of young age groups of Arctic charr in the receiving lake suggests that reproduction may not be succeeding. Predation by brown trout and burbot is the probable reason for this. Another possible reason for the reproductive failure may be too high a water temperature.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2021-01-26T06:38:14Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2021-01-26T06:38:15Z (GMT). No. of bitstreams: 0\n Previous issue date: 2021", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "45", "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": "rautu (Salvelinus alpinus (L)", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Stuorra Ravdoj\u00e4rvi", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "veden l\u00e4mp\u00f6tila", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Yl\u00e4-Lappi", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Tunturirautu (Salvelinus alpinus (L.)) muuttuvassa ymp\u00e4rist\u00f6ss\u00e4", "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-202101261258", "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": "nieri\u00e4", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "j\u00e4rvet", "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": "vedenlaatu", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "Lappi", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ravinto", "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"}]
|