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[{"key": "dc.contributor.author", "value": "Kivinen, Jouni", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2016-05-18T09:15:13Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2016-05-18T09:15:13Z", "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:1541643", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/49831", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Virtavedet ovat monimuotoisia elinymp\u00e4rist\u00f6j\u00e4, joissa esiintyy niihin erikoistuneita lajeja.\nNyky\u00e4\u00e4n kaikki eri virtavesityypit ovat maailmanlaajuisesti er\u00e4it\u00e4 ihmisen eniten\nmuokkaamista vesiekosysteemeist\u00e4. Muokattuja virtavesi\u00e4 on pyritty ennallistamaan\nerilaisin elinymp\u00e4rist\u00f6kunnostuksin. Suomessa tukinuittoon perattuja uomia on pyritty\nkalataloudellisesti tarkasteltuna kunnostamaan virtakutuisten lohikalojen poikas- ja\nlis\u00e4\u00e4ntymisalueiden parantamisella. Toimenpiteill\u00e4 ei useinkaan ole saatu merkitt\u00e4v\u00e4sti\nnostettua lohikalojen yksil\u00f6tiheyksi\u00e4, ja etenkin pienpoikasalueet ja kutusoraikot ovat usein\nj\u00e4\u00e4neet heikkolaatuisiksi. T\u00e4m\u00e4 tutkimus tarkasteli taimenen kutusoraikkoja Keski-Suomen\nkunnostetuissa koskissa, vertaillen eri ymp\u00e4rist\u00f6muuttujia luonnon- ja\nkunnostussoraikkojen, ja kutuun k\u00e4ytettyjen ja k\u00e4ytt\u00e4m\u00e4tt\u00f6mien soraikoiden v\u00e4lill\u00e4.\nNelj\u00e4lt\u00e4 pienehk\u00f6lt\u00e4 mets\u00e4joelta mitattiin soraikoiden virranopeuksia, tarkasteltiin niiden\nsoran raekokoja ja kiviaineksen rakennetta. Tulosten perusteella kunnostussoraikot\nsijaitsevat p\u00e4\u00e4osin liian hitaassa virrassa ja niiden soran raekoko on liian tasakokoista.\nMonipuolinen pohja-aineksen kokojakauma, kohtuullinen virrannopeus ja ison kiven\nsijainti l\u00e4hettyvill\u00e4 lis\u00e4\u00e4 soraikon k\u00e4yt\u00f6n todenn\u00e4k\u00f6isyytt\u00e4 kudussa. Kunnostussoraikkoja\non saattanut sijaita aiemmin my\u00f6s nopean virran alueilla, mutta niiden herk\u00e4n liikkuvuuden\nvuoksi, johtuen mm. tasakokoisesta raekoosta, ovat ne saattaneet huuhtoutua vuosien\nmy\u00f6t\u00e4 pois kutuun sopivilta alueilta. Pienill\u00e4kin korjaus- ja investointitoimilla olisi\nmahdollista parantaa olemassa olevia kunnostussoraikkoja tuottavammiksi.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Lotic waters are diverse habitats which have a wide variety of species adapted into. Today\nalmost all of the lotic water types are affected by different anthropogenic influences, and\nthey are among the most degraded water systems throughout the world. In Finland many of\nthe smallest rivers and creeks have been modified during the 19th and 20th century to be\nsuitable for log floating. At that time river channels were straightened, larger rocks blasted\nand smallest islands removed to ease the log flow. Modifications increased the water\nvelocity and decreased particle retention capacity. Spawning gravels of salmonids ware\nflushed gravels to unsuitable conditions for their egg development. Today most of the\nrivers have been restored. From fisheries perspective the main concept has been increasing\nthe suitable habitat for offspring of salmonids. Creating gravel beds in riffle section as\nartificial spawning grounds has also been one of the most important actions for the\nrestorations. Results have been more or less erratic. In general, the restorations have not\nbeen able to raise salmonid densities. This research concentrates to comparing the different\nmicrohabitat factors between the man-made and natural gravel beds and also comparing\nthem by the level of use in spawning. Results show that most man-made gravel beds are\nlocated in slower water current compared to the natural gravel areas. The heterogenic\ncomposition of different particle sizes, moderate water velocity and large rock positioning\nnearby increases the probability of usage of the particular gravel bed for spawning. Manmade\nrestoration gravels might have been located in faster flow earlier, but by now they\nhave been flushed to unsuitable habitats, partly because of their solid, unilateral size, which\nmakes them unstable. With rather minor reconstruction of the current gravel beds, it could\nbe possible to make them much more reproductive than they are now.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Jouni Kivinen (jokakivi) on 2016-05-18 09:15:13.394009. 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 2016-05-18T09:15:13Z\nNo. of bitstreams: 2\nURN:NBN:fi:jyu-201605182602.pdf: 703238 bytes, checksum: 6b9974a4d4dc0b572af6fa9f3f55c628 (MD5)\nlicense.html: 4833 bytes, checksum: 0b1c775c700851a48035265dd16fc262 (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2016-05-18T09:15:13Z (GMT). No. of bitstreams: 2\nURN:NBN:fi:jyu-201605182602.pdf: 703238 bytes, checksum: 6b9974a4d4dc0b572af6fa9f3f55c628 (MD5)\nlicense.html: 4833 bytes, checksum: 0b1c775c700851a48035265dd16fc262 (MD5)\n Previous issue date: 2016", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "1 verkkoaineisto (46 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": "Taimenen (Salmo trutta) kutusoraikot Keski-Suomen kunnostetuissa mets\u00e4joissa", "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-201605182602", "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": "2016-05-18T09:15:14Z", "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": "taimen", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "kutu", "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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