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[{"key": "dc.contributor.advisor", "value": "H\u00e4m\u00e4l\u00e4inen, Heikki", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Torniainen, Jyrki", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Lensu, Anssi", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Virtanen, Jani", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2020-03-20T05:45:59Z", "language": "", "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2020-03-20T05:45:59Z", "language": "", "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2020", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/68249", "language": "", "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "S\u00e4\u00e4ksi (Pandion haliaetus) on l\u00e4hes kaikkialla maailmassa esiintyv\u00e4 petolintu, joka\r\nk\u00e4ytt\u00e4\u00e4 ravintonaan kalaa. Helpon saaliin houkuttelemina s\u00e4\u00e4kset saalistavat\r\nkalanviljelylaitoksilla s\u00e4\u00e4nn\u00f6llisesti, mist\u00e4 viljelij\u00f6ille koituu taloudellisia\r\nmenetyksi\u00e4. On edelleen ep\u00e4varmaa, miss\u00e4 m\u00e4\u00e4rin s\u00e4\u00e4kset hy\u00f6tyv\u00e4t laitoksilta\r\npyydyst\u00e4m\u00e4st\u00e4\u00e4n helposta saaliista. Mik\u00e4li h\u00f6ty on merkitt\u00e4v\u00e4, voisi saalistuksen\r\nsalliminen ja vahinkojen korvaaminen viljelij\u00f6ille edist\u00e4\u00e4 lajin suojelua. T\u00e4t\u00e4 aihetta\r\nl\u00e4hdin tutkimaan kolmen eri aineiston ja menetelm\u00e4n avulla. Pes\u00e4tarkkailuilla ja\r\nisotooppianalyysill\u00e4 pyrin selvitt\u00e4m\u00e4\u00e4n viljellyn kirjolohen osuutta Konneveden\r\nalueen s\u00e4\u00e4ksien ravinnossa. Pesimiskauden 2018 aikana kahdeksaa s\u00e4\u00e4ksen pes\u00e4\u00e4\r\ntarkkailtiin ja pesiin viedyt saaliskalat tunnistettiin. Isotooppianalyysiss\u00e4 vuosien\r\n2015 ja 2016 s\u00e4\u00e4ksirengastusten yhteydess\u00e4 ker\u00e4ttyjen poikasten sulkien\r\nisotooppiarvot mitattiin ja ravinnon kirjolohiosuus arvioitiin niiden perusteella.\r\nLis\u00e4ksi pes\u00e4n ja l\u00e4himm\u00e4n kalanviljelylaitoksen v\u00e4lisen et\u00e4isyyden yhteytt\u00e4\r\npesimismenestykseen tutkin 18 vuoden ajalta ker\u00e4tyn rengastusaineiston avulla.\r\nArvioitujen kirjolohiosuuksien ja pesimismenestyst\u00e4 kuvaavien muuttujien v\u00e4listen\r\nyhteyksien selvitt\u00e4miseen k\u00e4ytin yleistetty\u00e4 lineaarista mallia. Tarkkailuaineiston\r\nperusteella s\u00e4\u00e4kset kalastavat kalanviljelylaitosten kirjolohta sit\u00e4 enemm\u00e4n, mit\u00e4\r\nl\u00e4hemp\u00e4n\u00e4 kalanviljelylaitosta pes\u00e4 sijaitsee. Rengastusaineistosta puolestaan k\u00e4vi\r\nilmi, ett\u00e4 pitk\u00e4ll\u00e4 aikav\u00e4lill\u00e4 s\u00e4\u00e4ksien keskim\u00e4\u00e4r\u00e4inen poikuekoko kasvavaa pes\u00e4n\r\nja kalanviljelylaitoksen v\u00e4lisen et\u00e4isyyden pienetess\u00e4. N\u00e4ist\u00e4 tuloksista poiketen\r\nisotooppianalyysin perusteella arvioidulla kirjolohiosuudella ei ollut yhteytt\u00e4\r\net\u00e4isyyteen ja se yhteys pesimismenestykseen oli negatiivinen. T\u00e4ss\u00e4 tutkimuksessa\r\nk\u00e4ytettyjen ravintoverkkotasojen muutoskertoimien mahdollinen ep\u00e4sopivuus ja\r\nluonnonkala-aineiston saalislajien ja -lajiryhmien isotooppiarvojen sis\u00e4inen suuri\r\nvaihtelu lienev\u00e4t merkitt\u00e4vin syy isotooppianalyysin poikkeaville tuloksille.\r\nKonneveden s\u00e4\u00e4kset n\u00e4ytt\u00e4isiv\u00e4t hy\u00f6tyv\u00e4n kalanviljelylaitoksilta pyyt\u00e4m\u00e4st\u00e4\u00e4n\r\nkirjolohesta hieman suuremman poikuekoon my\u00f6t\u00e4, mik\u00e4 saattaa olla merkitt\u00e4v\u00e4\r\netu hitaasti lis\u00e4\u00e4ntyv\u00e4lle s\u00e4\u00e4kselle. Hy\u00f6ty ilmenee kuitenkin vasta pitk\u00e4n ajan\r\nkuluessa, ja t\u00e4st\u00e4 syyst\u00e4 pesimismenestykseen vaikuttavien heikkojen yhteyksien\r\nerottamiseksi luonnollisesta vaihtelusta tarvitaan pitk\u00e4n aikav\u00e4lin tutkimusta.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Osprey (Pandion haliaetus) is a cosmopolitan fish preying bird found everywhere in\r\nthe world, except Antarctica. The species regularly preys on easily accessible farmed\r\nfish, and thereby causes economic losses to fish farms. However, it still remains\r\nunclear whether this subsidy is clearly beneficial. The dependence of breeding\r\nsuccess of Osprey to the farmed rainbow trout in their diet is particularly important\r\nwhen deciding whether to allow or prevent their fishing at the fish farms. If the\r\npossibility to prey farmed rainbow trout supports the survival of Osprey, fish farms\r\ncan thereby have a significant role in the conservation of species. In this study, first\r\nI investigated if the proportion of farmed rainbow trout in the diet of Osprey is\r\nrelated to the distance between the nest and the closest fish farm. During summer\r\n2018, eight nests of Osprey at varying distances from the fish farms were under\r\nmonitoring and the catch carried by Osprey was identified. Second, I used stable\r\nisotope analysis (SIA) to estimate proportions of rainbow trout and natural lake fish\r\nin the diet of Osprey. Generalized linear model was used to discover if any\r\ncorrelation between proportion of rainbow trout and breeding success does exist.\r\nMoreover ringing data collected by bird ringers during previous 18 years was used\r\nto study whether the number and the size of chicks as indicators of breeding success\r\ncorrelate with the distance to the fish farm. The direct observations suggested that\r\nOsprey prey more rainbow trout when nesting closer to a fish farm. They also seem\r\nto have a greater brood size in the long run, compared with those breeding further\r\naway. However, the results of SIA did not support all of these findings, which might\r\nbe caused by uncertainty in the use of discrimination factors and relatively large\r\nvariation in the isotope values of natural lake fish. This study suggests that Osprey\r\nin the Lake Konnevesi area have a slightly greater brood size when preying more\r\nrainbow trout. However, the benefit becomes significant only over a long period of\r\ntime and that is why long temporal extent is needed when studying the breeding\r\nsuccesses of slowly reproducing raptor like Osprey.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2020-03-20T05:45:59Z\r\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2020-03-20T05:45:59Z (GMT). No. of bitstreams: 0\r\n Previous issue date: 2020", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "68", "language": "", "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": "kalas\u00e4\u00e4ski", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "poikuekoko", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "stable isotope analysis", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "SIA", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "SIAR", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "vakaat isotoopit", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Kirjolohen merkitys s\u00e4\u00e4ksen (Pandion haliaetus) ravinnossa ja pesimismenestyksess\u00e4 Konneveden ymp\u00e4rist\u00f6ss\u00e4", "language": "", "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-202003202473", "language": "", "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": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Ymp\u00e4rist\u00f6tiede ja -teknologia", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Environmental science and technology", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "yvv.contractresearch.funding", "value": "0", "language": "", "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": null, "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": "4015", "language": "", "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "saalistus", "language": "", "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "pesint\u00e4", "language": "", "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "kirjolohi", "language": "", "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "poikaset", "language": "", "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "kalanviljely", "language": "", "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "s\u00e4\u00e4kset", "language": "", "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "s\u00e4\u00e4ksi", "language": "", "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "kalanviljelylaitokset", "language": "", "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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