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[{"key": "dc.contributor.advisor", "value": "H\u00e4m\u00e4l\u00e4inen, Heikki", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Aroviita, Jukka", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Heino, Tommi", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2017-05-11T07:28:54Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2017-05-11T07:28:54Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2017", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.other", "value": "oai:jykdok.linneanet.fi:1700699", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/53888", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Euroopan unionin vesipuitedirektiivin mukaan jokaisen j\u00e4senvaltion pintavesien ekologisen tilan tulee saavuttaa v\u00e4hint\u00e4\u00e4n hyv\u00e4 tila, eik\u00e4 jo hyv\u00e4ss\u00e4 tilassa olevien vesist\u00f6jen tila saa heikenty\u00e4. Yhten\u00e4 biologisena laatuelementtin\u00e4 tilan arvioinnissa k\u00e4ytet\u00e4\u00e4n pohjael\u00e4imi\u00e4. T\u00e4ss\u00e4 tutkimuksessa selvitettiin vedenkorkeuden s\u00e4\u00e4nn\u00f6stelyn sek\u00e4 valuma-alueiden maa- ja mets\u00e4talouden vaikutuksia j\u00e4rvien rantavy\u00f6hykkeen pohjael\u00e4imist\u00f6n tilaan ja pyrittiin tunnistamaan sellaiset ymp\u00e4rist\u00f6paineet ja niiden kriittiset rajat, jossa hyv\u00e4 tila vaarantuu. Rantavy\u00f6hykkeen pohjael\u00e4imist\u00f6lle laskettiin ekologinen laatusuhde (ELS), jonka arvoja verrattiin s\u00e4\u00e4nn\u00f6stelyn voimakkuuteen (s\u00e4\u00e4nn\u00f6stelykorkeus), valuma-alueen maank\u00e4ytt\u00f6\u00f6n (peltoprosentti) ja veden laatuun. Tulosten perusteella ELS oli negatiivisessa yhteydess\u00e4 s\u00e4\u00e4nn\u00f6stelyn voimakkuuteen, valuma-alueen peltoprosenttiin ja ravinnepitoisuuksiin. S\u00e4\u00e4nn\u00f6stellyiss\u00e4 j\u00e4rviss\u00e4 hyv\u00e4 ekologinen tila vaarantui vedenpinnan korkeuden vaihtelun ollessa 1,5\u20132 m. Maatalouden kuormittamissa j\u00e4rviss\u00e4 hyv\u00e4 tila vaarantui kun valuma-alueen peltoprosentti on v\u00e4lill\u00e4 12\u201321 ja fosforipitoisuus v\u00e4lill\u00e4 62\u201372 \u00b5g l-1. ELS korreloi negatiivisesti my\u00f6s typpipitoisuuden, klorofylli-a:n pitoisuuden ja sameuden kanssa ja positiivisesti n\u00e4k\u00f6syvyyden kanssa, mutta asetettuihin raja-arvoihin tulee suhtautua varauksella johtuen n\u00e4ytteenoton ajankohdasta sek\u00e4 j\u00e4rvien luontaisista piirteist\u00e4. Mets\u00e4talouden ja yhdyskuntien kuormittamissa j\u00e4rviss\u00e4 ELS ei ollut yhteydess\u00e4 maank\u00e4ytt\u00f6\u00f6n, mutta j\u00e4rvijoukko oli liian pieni yhteyden luotettavaan arvioimiseen. Luontaisen vaihtelun tarkempi huomioiminen sek\u00e4 vasteessa (ELS) ett\u00e4 ymp\u00e4rist\u00f6tekij\u00f6iss\u00e4, kuten ravinnepitoisuuksissa, tarkentaisi kriittisten raja-arvojen m\u00e4\u00e4rittely\u00e4. T\u00e4m\u00e4 edellytt\u00e4\u00e4 kuitenkin kattavampaa tyyppikohtaista aineistoa.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "As stipulated by the Water Framework Directive, the ecological status of surface waters in all EU Member States must be at least good and the present high or good status must be maintained. One of the biological quality elements used in defining, assessing and monitoring the ecological status of surface waters are macroinvertebrates. The objective of this study was to examine the effects of water level regulation and land use (agriculture and forestry) in catchment areas to the status of littoral macroinvertebrates. The objective was also to identify environmental pressures and critical levels of disturbance factors which compromise the achievement of the environmental objectives established in the Directive, i.e. the good status. For each study lake, an Ecological Quality Ratio (EQR) was defined to littoral macroinvertebrates and the quality ratio values were then compared to the intensity of water level fluctuation, land use in catchment areas (percentage cover of field) and water quality. The results suggest that the EQR correlates negatively with the intensity of water level regulation and agricultural land use and with nutrient content in water. In regulated lakes good ecological status was compromised if the amplitude of the water level fluctuation was between 1.5\u20132 m. In lakes affected by agricultural land use the good status was compromised when the field percentage in the catchment area was between 12\u201321 or the total phosphorus concentration between 62\u201372 \u00b5g l-1. The EQR also correlated negatively with nitrogen concentration, chlorophyll-a concentration and turbidity and positively with Secchi depth. However, the critical limit values for environmental stress variables defined in this study should be treated with some caution due to the timing of the sampling and natural variation. In lakes affected by forestry or urban pressures no decrease in EQR was detected, but the number of lakes included in the study was too small in order to draw a valid conclusion. The results do however suggest that closer observation of natural variation both in the EQR and in environmental factors, such as nutrient content, would further improve the definition of critical levels of disturbance. This would require larger data sets from each lake type.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Tommi Heino (totahein) on 2017-05-11 07:28:53.888354. Form: Pro gradu -lomake (https://kirjasto.jyu.fi/julkaisut/julkaisulomakkeet/pro-gradu-lomake). JyX data: [jyx_publishing-allowed (fi) =True]", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by jyx lomake-julkaisija (jyx-julkaisija.group@korppi.jyu.fi) on 2017-05-11T07:28:54Z\nNo. of bitstreams: 2\nURN:NBN:fi:jyu-201705112282.pdf: 1175803 bytes, checksum: 557f5ed138d539b05a1b48c9b57b6af5 (MD5)\nlicense.html: 4846 bytes, checksum: f16de0b31e7a621e192ee5281cc7eba4 (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2017-05-11T07:28:54Z (GMT). No. of bitstreams: 2\nURN:NBN:fi:jyu-201705112282.pdf: 1175803 bytes, checksum: 557f5ed138d539b05a1b48c9b57b6af5 (MD5)\nlicense.html: 4846 bytes, checksum: f16de0b31e7a621e192ee5281cc7eba4 (MD5)\n Previous issue date: 2017", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "1 verkkoaineisto (45 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": "j\u00e4rvet", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "pohjael\u00e4imet", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "s\u00e4\u00e4nn\u00f6stely", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "rantavy\u00f6hyke", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "rehev\u00f6ityminen", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "S\u00e4\u00e4nn\u00f6stelyn ja rehev\u00f6itymisen vaikutus j\u00e4rvien rantavy\u00f6hykkeen pohjael\u00e4imist\u00f6n tilaan", "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-201705112282", "language": null, "element": "identifier", 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