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[{"key": "dc.contributor.author", "value": "Aaltonen, Sari", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2013-05-21T13:41:25Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2013-05-21T13:41:25Z", "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:1261498", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/41527", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "T\u00e4pl\u00e4rapu (Pacifastacus leniusculus) on Suomen vesist\u00f6iss\u00e4 verrattain uusi vieraslaji, joka levi\u00e4\u00e4 sek\u00e4 suunnitelluin istutuksin ett\u00e4 suunnittelematta uusille alueille. T\u00e4pl\u00e4rapu on alun perin tuotu Suomeen korvaamaan rapuruton turmelemia jokirapukantoja, mutta sit\u00e4 on istutettu my\u00f6s alueille, joissa ei alkuper\u00e4ist\u00e4 rapukantaa ole aiemmin ollut. Kotoper\u00e4iseen jokirapuun verrattuna t\u00e4pl\u00e4rapu on paitsi vastustuskykyisempi rapurutolle, my\u00f6s nopeampi kasvamaan ja lis\u00e4\u00e4ntym\u00e4\u00e4n. T\u00e4pl\u00e4rapu kasvaa jokirapua suuremmaksi ja on luonteeltaan aggressiivisempi. Vieraslajina t\u00e4pl\u00e4rapu voi muuttaa uuden elinymp\u00e4rist\u00f6n rakennetta ja toimintaa. T\u00e4pl\u00e4rapu k\u00e4ytt\u00e4\u00e4 ravintonaan muun muassa selk\u00e4rangattomia pohjael\u00e4imi\u00e4, jotka toimivat my\u00f6s kalojen loisten v\u00e4li-is\u00e4ntin\u00e4. Vaikuttaessaan pohjael\u00e4inyhteis\u00f6ihin t\u00e4pl\u00e4ravut voivat siten vaikuttaa my\u00f6s loisten runsauteen ja yleisyyteen alueella. T\u00e4ss\u00e4 tutkimuksessa pyrittiin selvitt\u00e4m\u00e4\u00e4n, miten t\u00e4pl\u00e4ravun l\u00e4sn\u00e4olo alueella voi vaikuttaa saman alueen s\u00e4rkien (Rutilus rutilus) loisyhteis\u00f6ihin. Tutkimuksessa m\u00e4\u00e4ritettiin P\u00e4ij\u00e4nteell\u00e4 olevilta havaintoalueilta (n = 10) verkoin pyydystetyist\u00e4 s\u00e4rjist\u00e4 (n = 188) niiden loiset ja verrattiin loisyhteis\u00f6j\u00e4 ravuttomien (n = 5) ja ravullisten alueiden (n = 5) v\u00e4lill\u00e4, perustuen havaintoalueiden keskiarvoihin. Vertailut tehtiin sek\u00e4 loislajeittain ett\u00e4 v\u00e4li-is\u00e4nt\u00e4kohtaisesti. Tutkimuksessa havaittiin vesisiiraa (Asellus aquaticus) v\u00e4li-is\u00e4nt\u00e4n\u00e4\u00e4n k\u00e4ytt\u00e4v\u00e4n Acanthocephalus lucii \u2013v\u00e4k\u00e4k\u00e4rs\u00e4matoja merkitsev\u00e4sti v\u00e4hemm\u00e4n ravullisten alueiden s\u00e4rjill\u00e4. Toinen tilastollisesti merkitsev\u00e4 ero havaittiin simpukkav\u00e4litteisten Rhipidocotyle fennica \u2013imumatojen esiintyvyydess\u00e4. R. fennica oli yleisempi ravullisilla alueilla. Kun loiset jaettiin ryhmiin v\u00e4li-is\u00e4ntiens\u00e4 perusteella, ei simpukkav\u00e4litteisill\u00e4, kotilov\u00e4litteisill\u00e4 tai hankajalkaisten loisilla havaittu eroja ravullisten ja ravuttomien alueiden v\u00e4lill\u00e4. T\u00e4m\u00e4 tutkimuksen tulokset vahvistavat osittain aiempia tutkimustuloksia t\u00e4pl\u00e4ravun mahdollisista seurannaisvaikutuksista kalojen loisyhteis\u00f6ihin, mutta toisaalta osoittavat, ett\u00e4 vaikutusten esiintyminen ja voimakkuus riippuvat my\u00f6s kalais\u00e4ntien ekologiasta ja habitaatin k\u00e4yt\u00f6st\u00e4.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Signal crayfish (Pacifastacus leniusculus) is an alien species spreading planned and unplanned in Finnish freshwaters. Signal crayfish has been introduced to compensate for the reduction of endemic noble crayfish stocks (Astacus astacus) due to crayfish plague. Signal crayfish has been introduced also into areas with no previous crayfish population. Compared to the endemic species, signal crayfish is more resistant to the plague and has faster growth and reproduction rate. Adult signal crayfish is larger in size than the endemic species and more aggressive in its behavior. As an alien species, it can change the structure and function of the ecosystem. Crayfish feeds partly on freshwater invertebrates. These same invertebrates can act as hosts for fish parasites. By eating invertebrates, signal crayfish might affect the abundance and prevalence of fish parasites. In this study, the aim was to investigate if the signal crayfish can affect the parasites of roach (Rutilus rutilus) in a large lake ecosystem, previously naive to crayfish. The study was conducted at lake P\u00e4ij\u00e4nne, the parasites were determined from roaches (n = 188) caught in the study sites (n = 10) by gillnets. The average abundances and prevalences of parasite species found from roach in each study area were compared between areas with (n = 5) and without (n = 5) signal crayfish. Comparisons were made also by grouping the species according to their invertebrate hosts. The study revealed less Acanthocephalus lucii \u2013infections on roaches caught from study sites with signal crayfish. The intermediate host of A. lucii is waterlouse (Asellus aquaticus). Rhipidocotyle fennica, a trematode parasitizing bivalves, was more prevalent on roaches caught in areas with crayfish. There were no significant differences when comparing parasites as groups infecting bivalves, gastropods or copepods. This study brings out new information about the effects of signal crayfish, an introduced alien species, on fish parasite communities. On the other hand, it has been demonstrated that the occurrence and strength of effects depend also on the ecology and habitat of fish hosts.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Sari Aaltonen (sarannaa) on 2013-05-21 13:41:24.837490. 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 2013-05-21T13:41:25Z\nNo. of bitstreams: 2\nURN:NBN:fi:jyu-201305211740.pdf: 429672 bytes, checksum: 93d6f031b67fcbb0960b1e5b167732eb (MD5)\nlicense.html: 107 bytes, checksum: a7d86e598caa500b1b433bbb9dc8ef1c (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2013-05-21T13:41:25Z (GMT). No. of bitstreams: 2\nURN:NBN:fi:jyu-201305211740.pdf: 429672 bytes, checksum: 93d6f031b67fcbb0960b1e5b167732eb (MD5)\nlicense.html: 107 bytes, checksum: a7d86e598caa500b1b433bbb9dc8ef1c (MD5)\n Previous issue date: 2013", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "29 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": "Acanthocephalus lucii", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Asellus aquaticus", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Astacidae", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "rapuistutukset", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Rhipidocotyle fennica", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "vieraslaji", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "v\u00e4li-is\u00e4nt\u00e4", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "T\u00e4pl\u00e4ravun (Pacifastacus leniusculus) vaikutus s\u00e4rjen (Rutilus rutilus) loisiin P\u00e4ij\u00e4nteell\u00e4", "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-201305211740", "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.date.updated", "value": "2013-05-21T13:41:25Z", "language": null, "element": "date", "qualifier": "updated", "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": "vieraslajit", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "t\u00e4pl\u00e4rapu", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "loiset", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "s\u00e4rki", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "P\u00e4ij\u00e4nne", "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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