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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": "Pulkkinen, Katja", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Enroth, Hanna", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2022-06-08T06:46:57Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2022-06-08T06:46:57Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2022", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/81559", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Pohjois-Savossa sijaitsevan Kallaveden ekologinen tila uhkaa heiket\u00e4 hyv\u00e4\u00e4 tilaa huonommaksi, mik\u00e4li viime vuosina j\u00e4rvess\u00e4 havaittu kasviplanktonin runsastuminen jatkuu. J\u00e4rveen kohdistuvassa kokonaisravinnekuormituksessa ei ole havaittu muutoksia, jotka selitt\u00e4isiv\u00e4t lev\u00e4tuotannon runsastumisen. T\u00e4m\u00e4n Pro gradu -tutkielman tarkoituksena oli selvitt\u00e4\u00e4, voidaanko Etel\u00e4-Kallavedess\u00e4 tapahtunutta kasviplanktonin runsastumista selitt\u00e4\u00e4 ravintoverkkoteorian avulla, ravintoverkon ylemmill\u00e4 trofiatasoilla (el\u00e4inplankton, sulkahyttysen toukat) tapahtuneilla muutoksilla. Ravintoverkossa tapahtuneita muutoksia tarkasteltiin vertailemalla 1990-luvulla ja vuonna 2019 ker\u00e4ttyj\u00e4 aineistoja kasviplanktonin lajistokoostumuksen, el\u00e4inplanktonin lajiston, tiheyden ja yksil\u00f6koon sek\u00e4 sulkahyttysen toukkien (Chaoborus flavicans) tiheyden osalta. El\u00e4inplanktonlajistoa, eri lajiryhmien biomassoja ja yksil\u00f6iden pituuksia verrattiin vuosina 1990, 1992, 1993 ja 1996 s\u00e4il\u00f6ttyjen elokuun loppupuolen n\u00e4ytteiden sek\u00e4 vuoden 2019 n\u00e4ytteiden v\u00e4lill\u00e4. Erityisesti tarkastelun kohteena olivat kasviplanktonia tehokkaasti ravintonaan k\u00e4ytt\u00e4v\u00e4t ja Kallaveden el\u00e4inplanktonn\u00e4ytteiss\u00e4 runsaina esiintyv\u00e4t el\u00e4inplanktonsuvut: Daphnia- ja Bosmina-vesikirput sek\u00e4 Eudiaptomus hankajalkaiset. Kasviplanktonaineiston perusteella el\u00e4inplanktonille sy\u00f6t\u00e4v\u00e4ksi kelpaava kasviplankton on v\u00e4hentynyt verrattuna ei-sy\u00f6t\u00e4v\u00e4ksi luokiteltuun kasviplanktoniin. Elokuun el\u00e4inplanktonn\u00e4ytteet viittasivat siihen, ett\u00e4 tutkittujen el\u00e4inplanktonsukujen yksil\u00f6koot ovat pienentyneet 1990-luvulta vuoden 2019 n\u00e4ytteisiin verrattuna. Etenkin Daphnia-vesikirppujen yksil\u00f6tiheyden havaittiin pienentyneen. Tarkastelun perusteella sulkahyttysen toukkien yksil\u00f6tiheys on kasvanut. El\u00e4inplanktonia ravintonaan k\u00e4ytt\u00e4vien sulkahyttysen toukkien runsastuminen, tehokkaasti kasviplanktonia suodattavien el\u00e4inplanktonsukujen yksil\u00f6koon pieneneminen sek\u00e4 kasviplanktonlajistossa tapahtuneet muutokset antavat viitteit\u00e4 siit\u00e4, ett\u00e4 ravintoverkkos\u00e4\u00e4tely on vaikuttanut kasviplanktonin runsastumiseen Etel\u00e4-Kallavedell\u00e4.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "The ecological status of Lake Kallavesi in Northern Savonia is in risk of deteriorating from good to worse if the increase in phytoplankton abundance continues. No changes have been observed in the nutrient concentrations that would explain the increase in algal production. The purpose of this Master\u2019s thesis was to find out whether the increase in phytoplankton in South Kallavesi can be explained by food web theory; whether there have been changes in the higher trophic levels of the food web (zooplankton, phantom midge larvae) that have led to a change in the phytoplankton community. The changes in the food web were investigated by comparing the data collected in the 1990s and 2019 in terms of the species composition of phytoplankton, species composition, density and individual size distribution of zooplankton community and density of phantom midges (Chaoborus flavicans). The zooplankton species, biomass of different species groups, and individual lengths were compared between samples stored in late August in 1990, 1992, 1993, and 1996, and samples from 2019. Particular focus was given to the zooplankton species that use phytoplankton efficiently as food and are abundant in Lake Kallavesi zooplankton samples: Daphnia, Bosmina and Eudiaptomus. Based on phytoplankton data, edible phytoplankton for zooplankton has decreased compared to phytoplankton classified as non-edible. The zooplankton samples in August indicated that the individual sizes of the studied zooplankton genera have decreased from the 1990's compared to the 2019 samples. In particular, the individual density of Daphnia was reduced. The abundance of phantom midge larvae has increased. The proliferation of phantom midge larvae that feed on zooplankton, the reduction in the individual size of zooplankton families that effectively filter phytoplankton, and changes in phytoplankton species suggest that phytoplankton regulation in South Kallavesi has been affected by food web regulation.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Miia Hakanen (mihakane@jyu.fi) on 2022-06-08T06:46:57Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2022-06-08T06:46:57Z (GMT). No. of bitstreams: 0\n Previous issue date: 2022", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "56", "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": "sulkahyttysen toukat", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "el\u00e4inplankton", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Ravintoverkkos\u00e4\u00e4telyn vaikutukset Kallaveden planktonyhteis\u00f6\u00f6n", "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-202206083172", "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": "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": "yvv.contractresearch.collaborator", "value": "public", "language": "", "element": "contractresearch", "qualifier": "collaborator", "schema": "yvv"}, {"key": "yvv.contractresearch.funding", "value": "5499", "language": "", "element": "contractresearch", "qualifier": "funding", "schema": "yvv"}, {"key": "yvv.contractresearch.initiative", "value": "business", "language": "", "element": "contractresearch", "qualifier": "initiative", "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": "4012", "language": "", "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "plankton", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "j\u00e4rvet", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ravintoverkot", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "Kallavesi", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ekologinen tila", "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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