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[{"key": "dc.contributor.author", "value": "Chowdhury, Motiur", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2014-11-11T20:28:17Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2014-11-11T20:28:17Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2013", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.other", "value": "oai:jykdok.linneanet.fi:1451263", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/44623", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Freshwater pearl mussel Margaritifera margaritifera is endangered throughout its range of distribution in Europe. In some rivers M. margaritifera may co-occur with the duck mussel Anodonta anatina. Brown trout Salmo trutta serves as suitable fish host for both mussel species. Thus it is possible that exposure of brown trout to A. anatina glochidia might increase resistance of fish against M. margaritifera glochidia. The aim was to test this \u2018cross immunity hypothesis\u2019. Brown trout were immunized by duck mussel (Anodonta anatina) glochidia in late May. Then brown trout were challenged by pearl mussel (Margaritifera margaritifera) glochidia in late August after the A. anatina glochidia were developed and dropped off from the fish. The mean number and size of M. margaritifera glochidia were compared between immunized and control fish in 4 different time points over 10 months. Besides of these, effect of marking of fish (fin-clipping), fish length and body side (left vs. right) on glochidia number was also studied. The mean number of attached glochidia was significantly lower in immunized fish than in the unimmunized control fish in the first time point, in September, but not in December, May or June. No effect of immunization on growth (size) of glochidia was observed in any time point. Unexpectedly, right side gills contained more glochidia than left side gills of fish regardless immunization. Fish length had a significant positive effect on glochidial abundance. Fin-clipped fish had less glochidia than non-clipped fish. Result indicates that fin-clipping may activate non-specific immunity that may have given protection against M. margaritifera glochidiosis. Results of the present study suggest that cross immunization by exposer to A. anatina glochidia may not possess a significant threat for M. margaritifera conservation.\n\nJokihelmisimpukka Margaritifera margaritifera on eritt\u00e4in uhanalainen makean veden simpukkalaji. Jokihelmisimpukalla el\u00e4m\u00e4nkierrossaan on loisiva toukkavaihe, glokidium, joka el\u00e4\u00e4 lohen ja taimenen kiduksille tarttuneena. Joissakin tapauksissa pikkuj\u00e4rvisimpukka Anodonta anatina saattaa esiinty\u00e4 samassa habitaatissa jokihelmisimpukan kanssa. T\u00e4st\u00e4 syyst\u00e4 t\u00e4ss\u00e4 ty\u00f6ss\u00e4 haluttiin tutkia aiheuttaako taimenen (Salmo trutta) altistaminen pikkuj\u00e4rvisimpukan (Anodonta anatina) glokidium-toukille immunisaation jokihelmisimpukan (Margaritifera margaritifera) glokidium-toukkia vastaan. Immunisointi: Glokidium-toukille altistumattomat, 1+ taimenet (300 kpl, Iijoen meritaimen, RKTL Taivalkoski) infektoitiin pikkuj\u00e4rvisimpukan (Koij\u00e4rvi, Kerim\u00e4ki) toukilla Konneveden tutkimusasemalla kes\u00e4kuun alussa 2012. Infektion onnistuminen (5 p\u00e4iv\u00e4\u00e4 infektoinnista), sek\u00e4 toukkien kypsyminen ja poistuminen kaloista (2,5 kk infektoinnista) tarkastettiin mikroskooppisesti. Kalat merkittiin ev\u00e4leikkauksin siten, ett\u00e4 kahdessa koealtaassa immunisoidut kalat olivat ev\u00e4leikattuja ja kahdessa altaassa puolestaan kontrollikalat olivat ev\u00e4leikattuja (yhteens\u00e4 4 allasta). Kalat haasteinfektoitiin jokihelmisimpukan toukilla elokuun lopussa ja toukkien lukum\u00e4\u00e4r\u00e4 ja koko tutkittiin 2012 syyskuun lopussa ja joulukuussa sek\u00e4 2013 toukokuussa ja kes\u00e4kuussa, kun toukat alkoivat kypsy\u00e4. Immunisointi pikkuj\u00e4rvisimpukan toukilla antoi tilastollisesti merkitsev\u00e4n suojan jokihelmisimpukan toukkia vastaan syyskuussa, mutta sen j\u00e4lkeen vaikutus h\u00e4visi. Yll\u00e4tt\u00e4en tulokset viittasivat siihen, ett\u00e4 ev\u00e4leikkaus suojasi taimenia jokihelmisimpukkainfektiolta paremmin kuin immunisointi pikkuj\u00e4rvisimpukan toukilla. Ev\u00e4leikkaus 2 viikkoa ennen haasteinfektiota saattoi tehostaa ep\u00e4spesifin immuunij\u00e4rjestelm\u00e4n toimintaa kaloissa. Viel\u00e4 yll\u00e4tt\u00e4v\u00e4mpi tulos oli se, ett\u00e4 jokihelmisimpukka-glokidioitten m\u00e4\u00e4r\u00e4 oli korkeampi kalojen oikean puolen kiduksilla verrattuna vasempaan puoliskoon. T\u00e4t\u00e4 tulosta oli vaikea selitt\u00e4\u00e4, mutta se saattaa liitty\u00e4 esimerkiksi kalojen kasvatusaikaisiin olosuhteisiin\u2014ehk\u00e4 oikean puolen kidukset olivat kookkaammat, jolloin niihin mahtui enemm\u00e4n toukkia. Kaiken kaikkiaan tulokset viittavat siihen, ett\u00e4 altistuminen pikkuj\u00e4rvisimpukan toukille ei saata muodostaa vakavaa uhkaa jokihelmisimpukan menestymiselle taimenis\u00e4nn\u00e4ss\u00e4.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Motiur Chowdhury (mdmorach) on 2014-11-11 20:28:16.441182. Form: Master's Thesis publishing form (1 author) (https://kirjasto.jyu.fi/publish-and-buy/publishing-forms/masters-thesis-publishing-form-1-author). 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 2014-11-11T20:28:16Z\nNo. of bitstreams: 2\nURN:NBN:fi:jyu-201411113222.pdf: 758920 bytes, checksum: f666d4df5da24df7f7188d734e5048ca (MD5)\nlicense.html: 4350 bytes, checksum: a3c4b7474880ce0c1308d496e67374bd (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2014-11-11T20:28:17Z (GMT). No. of bitstreams: 2\nURN:NBN:fi:jyu-201411113222.pdf: 758920 bytes, checksum: f666d4df5da24df7f7188d734e5048ca (MD5)\nlicense.html: 4350 bytes, checksum: a3c4b7474880ce0c1308d496e67374bd (MD5)\n Previous issue date: 2013", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "1 verkkoaineisto (24 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": "Acquired resistance", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Cross resistance", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Duck mussel", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Pearl mussel", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Trout", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Glokidium-toukka", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "hankittu immuniteetti", "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": "pikkuj\u00e4rvisimpukka", "language": "", 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