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[{"key": "dc.contributor.author", "value": "Ranta, Mikko", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2010-02-28T09:13:00Z", "language": "", "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2010-02-28T09:13:00Z", "language": "", "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2010", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.other", "value": "oai:jykdok.linneanet.fi:1124150", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/22999", "language": "", "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Jokihelmisimpukan suhde sen is\u00e4nt\u00e4kaloihin on t\u00e4lle uhanalaiselle, karujen virtaavien vesien nilvi\u00e4iselle elint\u00e4rke\u00e4. Aihetta on tutkittu v\u00e4h\u00e4n, ja jokihelmisimpukan suojelun kannalta se on elinymp\u00e4rist\u00f6n yhten\u00e4 kriittisen\u00e4 osana merkitt\u00e4v\u00e4 tutkimuskohde. Kentt\u00e4tutkimuksessa selvitettiin jokihelmisimpukan loisvaiheen is\u00e4nn\u00e4n, purotaimenen, vaikutusta simpukoiden esiintymiseen. Tutkimusaineisto ker\u00e4ttiin 27.5.-22.9.2009 s\u00e4hk\u00f6kalastuksin (7 kalastuskertaa n. 3 viikon v\u00e4lein) yhdest\u00e4 Luttojoen vesist\u00f6alueen latvapurosta. Aineistosta tutkittiin jokihelmisimpukoiden glokidium-toukkien loisinnan prevalenssi, abundanssi ja intensiteetti vertaillen simpukka-aloilta (n=12, simpukkatiheys 4-43 yks./m2) ja kontrollialoilta (n=12, ei simpukoita) pyydettyj\u00e4 kaloja. Tutkimuksen tavoitteena oli lis\u00e4ksi selvitt\u00e4\u00e4 jokihelmisimpukan elinkierron 2 kriittist\u00e4 ajankohtaa eli toukkien kiinnittyminen is\u00e4nt\u00e4kaloihin ja irtoaminen is\u00e4nnist\u00e4, sek\u00e4 loisinnan yleisyys kes\u00e4ll\u00e4 ja syksyll\u00e4 (kaksi eri glokidium-toukkasukupolvea). Puron kalasto koostui p\u00e4\u00e4asiassa purotaimenista ja muduista. Koealojen purotaimenten keskitiheys oli 20,4 yks./100m2. Kalatiheydet eiv\u00e4t eronneet tilastollisesti toisistaan koealoilla, mutta simpukka-aloilla kalat olivat suurempia. Juveniilit simpukat irtosivat is\u00e4nt\u00e4kaloista elokuun alkupuoliskolla ja uudet toukat infektoivat kalat elokuun lopussa tai syyskuun alussa. Toukat kasvoivat syyskuussa sek\u00e4 kev\u00e4\u00e4ll\u00e4 ja kes\u00e4ll\u00e4 voimakkaan lineaarisesti veden l\u00e4mmetess\u00e4 saavuttaen keskikoon 413 \u00b5m (SD\u00b114 \u00b5m) ennen irtoamistaan is\u00e4nnist\u00e4. Loisinnan abundanssi oli kes\u00e4ll\u00e4 yli 5 kertaa suurempi simpukka- kuin kontrollialoilla. Glokidium-toukka lukum\u00e4\u00e4rien ja kalatiheyksien perusteella voidaan arvioida, ett\u00e4 juveniileja simpukoita irtosi kaloista selv\u00e4sti enemm\u00e4n simpukka-aloille (1035 yks./100 m2) kuin kontrollialoille (115 yks./100 m2) loisvaiheen j\u00e4lkeen. T\u00e4m\u00e4 viittaa vahvasti siihen, ett\u00e4 is\u00e4nt\u00e4kalojen spatiaalinen jakautuminen saattaa vaikuttaa jokihelmisimpukoiden tyypilliseen laikuittaiseen esiintymiseen virtavesiss\u00e4. Simpukoiden spatiaalinen jakautuminen purossa n\u00e4ytt\u00e4\u00e4 selke\u00e4sti vaikuttavan glokidium-toukkien alueelliseen esiintymiseen ja m\u00e4\u00e4r\u00e4\u00e4n kaloissa, koska syksyll\u00e4 toukkien parveilun j\u00e4lkeen simpukka-aloilta pyydetyiss\u00e4 taimenissa oli yli 6 kertaa enemm\u00e4n toukkia kuin kontrollialojen kaloissa. Syksyll\u00e4 (uudet toukat) loisinnan intensiteetti oli selv\u00e4sti suurempi kuin kes\u00e4ll\u00e4 (vanhat toukat), mutta loisinnan prevalenssin suhteen tilanne oli p\u00e4invastainen. Purotaimenten pituus ja ik\u00e4 eiv\u00e4t vaikuttaneet jokihelmisimpukan loisintaan. Mahdollisesti purotaimenet esiintyv\u00e4t purossa paikallisesti ja juveniilit simpukat irtoavat is\u00e4nt\u00e4kaloistaan samoille paikoille kuin miss\u00e4 ne ovat n. 11 kuukautta aiemmin infektoineet kalat.", "language": "", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Mikko Ranta (mianrant) on 2010-02-28 09:12:56.660349. 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 2010-02-28T09:12:59Z\r\nNo. of bitstreams: 2\r\nURN:NBN:fi:jyu-201002281293.pdf: 222144 bytes, checksum: ed55693061e339f444a67049b46cc405 (MD5)\r\nlicense.html: 5020 bytes, checksum: d6b44d44b64d550f970a33a3e17bec7a (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2010-02-28T09:13:00Z (GMT). No. of bitstreams: 2\r\nURN:NBN:fi:jyu-201002281293.pdf: 222144 bytes, checksum: ed55693061e339f444a67049b46cc405 (MD5)\r\nlicense.html: 5020 bytes, checksum: d6b44d44b64d550f970a33a3e17bec7a (MD5)\r\n Previous issue date: 2010", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "26 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": "Alueellinen ja ajallinen vaihtelu jokihelmisimpukan ja purotaimenen v\u00e4lisess\u00e4 suhteessa", "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-201002281293", "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.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": "loiset", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "jokihelmisimpukka", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "purotaimen", "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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