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[{"key": "dc.contributor.author", "value": "S\u00e4kkinen, Tapani", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2012-05-24T14:42:07Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2012-05-24T14:42:07Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2012", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.other", "value": "oai:jykdok.linneanet.fi:1217297", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/37895", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Jokihelmisimpukan (Margaritifera margaritifera L.) el\u00e4m\u00e4nkierron eri vaiheiden ajoitus tunnetaan heikosti, mik\u00e4 vaikeuttaa mm. suojelutoimien suunnittelua. T\u00e4m\u00e4n tutkimuksen tavoitteena oli havainnoida jokihelmisimpukan glokidium-toukkien kehittymist\u00e4 ja lukum\u00e4\u00e4ri\u00e4 kahdessa Iijoen alueen taimenpurossa. Erityisesti pyrimme saamaan tietoa siit\u00e4, milloin toukat kiinnittyv\u00e4t kaloihin ja milloin ne irtoavat niist\u00e4. Lis\u00e4ksi tavoitteena oli saada tietoa toukkien kasvunopeudesta loisvaiheessa. Tutkimus kohdistettiin kahteen l\u00e4mp\u00f6tiloiltaan erilaiseen puroon Iijoen alueella 9.6. ja 7.9. v\u00e4lisen\u00e4 aikana. Tutkimuskalana k\u00e4ytettiin purotaimenta (Salmo trutta m. fario L.), joka on puroissa luonnostaan esiintyv\u00e4 raakun loisvaiheen is\u00e4nt\u00e4kala. Ty\u00f6 on osa pohjoismaista Interreg Raakku -hanketta (2011\u20132014). Glokidium-toukkien irtoaminen kaloista ajoittui l\u00e4mpim\u00e4ll\u00e4 purolla p\u00e4\u00e4asiassa v\u00e4lille 9.6.\u201328.6. ja kylm\u00e4ll\u00e4 purolla v\u00e4lille 27.6.\u201320.7. Uudet toukat eiv\u00e4t olleet tarttuneet kaloihin kylm\u00e4ll\u00e4 purolla viel\u00e4 2.8., mutta 31.8. n\u00e4ytteess\u00e4 niit\u00e4 havaittiin ja toukat olivat keskipituudeltaan 80 \u00b5m. L\u00e4mpim\u00e4ll\u00e4 purolla uusia toukkia ei havaittu viel\u00e4 31.8., mutta 7.9. n\u00e4ytteess\u00e4 niit\u00e4 esiintyi keskipituuden ollessa 70 \u00b5m. Toukkien pituudesta voidaan p\u00e4\u00e4tell\u00e4, ett\u00e4 kylm\u00e4ll\u00e4 purolla infektoituminen uusilla glokidium-toukilla on tapahtunut selv\u00e4sti ennen elokuun loppua, koska aikaisemmat havainnot viittaavat uusien toukkien olevan kooltaan n. 70 \u00b5m. Erot toukkien kehittymisess\u00e4 eri puroissa johtunevat p\u00e4\u00e4asiassa veden l\u00e4mp\u00f6tilaerosta. Veden l\u00e4mp\u00f6tila oli kylm\u00e4ss\u00e4 purossa yli 15 \u00b0C viiden vuorokauden ajan aikav\u00e4lill\u00e4 29.6.\u20133.7. Toukkien pudottautuminen kaloista lienee alkanut kyseisen\u00e4 ajanjaksona, koska aikaisemmissa tutkimuksissa toukkien on havaittu irtoavan kaloista veden l\u00e4mp\u00f6tilan ollessa \u201dpysyv\u00e4sti\u201d yli 15 \u00b0C. Tulokset tukivat t\u00e4t\u00e4 kynnysl\u00e4mp\u00f6tilan \u201dpysyv\u00e4n\u201d ylityksen tarpeellisuutta toukkien parveilun ajoittumiseen. Kylm\u00e4n puron toukat olivat kes\u00e4kuun alussa huomattavasti pienempi\u00e4 verrattuna l\u00e4mpim\u00e4\u00e4n puroon. Seuraavana tutkimusp\u00e4iv\u00e4n\u00e4 27./28.6. ero oli l\u00e4hes tyystin kadonnut. L\u00e4mpim\u00e4ll\u00e4 purolla l\u00e4mp\u00f6tila laski 3.9.\u20135.9 nopeasti alle 13 \u00b0C:een, mik\u00e4 on ehk\u00e4 toiminut laukaisevana tekij\u00e4n\u00e4 uusien glokidium-toukkien parveilulle. Kylm\u00e4n puron vesi oli alle 13-asteista aikav\u00e4lill\u00e4 5.8.\u201315.8., joten siell\u00e4 toukat ovat voineet tarttua kaloihin jo elokuun alkupuoliskolla. Raakun loisvaihe kesti siis kylm\u00e4ll\u00e4 purolla ehk\u00e4 11-11,5 kk ja l\u00e4mpim\u00e4ll\u00e4 purolla n. 10,5 kk, jos infektoitumisen oletetaan tapahtuneen molemmilla puroilla my\u00f6s edellisen\u00e4 vuonna samoihin aikoihin.", "language": null, "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Tapani S\u00e4kkinen (mitasakk) on 2012-05-24 14:42:07.003112. 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 2012-05-24T14:42:07Z\nNo. of bitstreams: 2\nURN:NBN:fi:jyu-201205241731.pdf: 337159 bytes, checksum: 22ba69a67b5f12b7ec17351a3aba19ef (MD5)\nlicense.html: 5091 bytes, checksum: bb970aa7037337abc124764ea79f707c (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2012-05-24T14:42:07Z (GMT). No. of bitstreams: 2\nURN:NBN:fi:jyu-201205241731.pdf: 337159 bytes, checksum: 22ba69a67b5f12b7ec17351a3aba19ef (MD5)\nlicense.html: 5091 bytes, checksum: bb970aa7037337abc124764ea79f707c (MD5)\n Previous issue date: 2012", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "31 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": "glokidium-toukka", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "jokihelmisimpukka", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Margaritifera", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "l\u00e4mp\u00f6tila", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "raakku", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Salmo trutta", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Jokihelmisimpukan (Margaritifera margaritifera) glokidium-toukkien kehittyminen ja lukum\u00e4\u00e4r\u00e4t kalais\u00e4nn\u00e4ss\u00e4 kahdessa Iijoen alueen taimenpurossa", "language": null, "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": 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"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": "2012-05-24T14:42:07Z", "language": null, 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