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[{"key": "dc.contributor.advisor", "value": "Karjalainen, Juha", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Hyv\u00e4rinen, Heini", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Taskinen, Jouni", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Soininen, Ripsa", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2024-10-01T05:39:51Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2024-10-01T05:39:51Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2024", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/97311", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Jokihelmisimpukka eli raakku on yksi pohjoisen pallonpuoliskon uhanalaisimmista lajeista. Lajin suojelun kannalta on t\u00e4rke\u00e4\u00e4 ymm\u00e4rt\u00e4\u00e4 lajin uhanalaisuuden syit\u00e4, joita ovat muun muassa is\u00e4nt\u00e4kalojen puute, jokien patoaminen ja ojitus, rehev\u00f6ityminen, saastuminen ja helmenkalastus. Makeiden vesien suolaantumisesta on viime vuosikymmenten aikana tullut uhka vesiekosysteemeille, sill\u00e4 korkeiden suolapitoisuuksien on huomattu olevan haitallisia vesieli\u00f6ille. Tiesuolan vaikutuksia raakkuun ei tunneta hyvin. T\u00e4m\u00e4n tutkimuksen tavoitteena on tutkia kokeellisesti tiesuolana k\u00e4ytetyn natriumkloridin pitk\u00e4aikaisaltistuksen vaikutusta raakun poikasten kasvuun, aktiivisuuteen ja selviytymiseen pehme\u00e4ss\u00e4 vedess\u00e4. Noin vuoden ik\u00e4isi\u00e4 poikasia altistettiin 28 p\u00e4iv\u00e4n ajan kymmenelle eri k\u00e4sittelylle: kontrolli ja yhdeks\u00e4n eri natriumkloridipitoisuutta (200\u20134400 mg/l). Poikaset laitettiin 6-kuoppalevyille, joissa oli suodatettuun Konneveden j\u00e4rviveteen valmistetut suolaliuokset ja ruokaliuosta. Altistuskokeen aikana seurattiin poikasten kuolleisuutta ja aktiivisuutta. Aktiivisuutta mitattiin tarkkailemalla poikasten liikkumista kahdeksana tarkkailukertana kokeen aikana. Poikasten kasvua mitattiin punnitsemalla niiden tuore- ja kuivamassa kokeen lopussa. Pitk\u00e4aikainen natriumkloridialtistus vaikutti merkitt\u00e4v\u00e4sti poikasten kuolleisuuteen. Simpukoiden LC10-natriumkloridipitoisuus oli 1886 mg/l ja LC50-pitoisuus 1994 mg/l. Natriumkloridi v\u00e4hensi merkitt\u00e4v\u00e4sti poikasten aktiivisuutta. EC10-pitoisuus oli 1082 mg/l ja EC50 1970 mg/l. Pitk\u00e4aikainen altistuminen natriumkloridille vaikutti merkitt\u00e4v\u00e4sti my\u00f6s poikasten kuivamassan kasvuun. Natriumkloridi aiheutti jokihelmisimpukoissa kuolleisuutta matalammissa pitoisuuksissa kuin muilla makean veden simpukoilla on havaittu.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Freshwater pearl mussel (FPM) is one of the most endangered species in the northern hemisphere. To protect this threatened species, it is important to understand why FPM populations are declining. That are, for example the lack of host fishes, river damming and drainage, riverbed siltation, eutrophication, pollution and pearl fishing. Salinization of freshwater has become a threat to aquatic ecosystems in the last decades. High salt concentrations can be toxic to aquatic organisms. Information on the effects of de-icing salts on freshwater pearl mussels is lacking. This study aims to explore the effects of chronic exposure to sodium chloride on the growth, activity and viability of FPM juveniles in soft freshwater. One year old juveniles were kept in different saline solutions for 28 days and are exposed to ten different treatments: control and nine sodium chloride concentrations (200-4400 mg/l). The juveniles were kept in 6-wellplates that contained filtered Lake Konnevesi water with NaCl and commercial algae mix. During the exposure the mortality and activity of the juveniles was observed. Activity was rated based on their movement during each observation period during the experiment. Growth was measured fresh weight and dry weight of the juveniles at the end of the experiment. Chronic exposure to sodium chloride significantly affected mortality of the juveniles. LC10 concentration for sodium chloride was 1886 mg/l and LC50 concentration was 1994 mg/l. Sodium chloride exposure reduced the activity of the FPM juveniles. EC10 was 1082 mg/l and EC50 1970 mg/l. Chronic exposure to sodium chloride also significantly affected the growth of dry weight in the juveniles. Sodium chloride was lethal to FPM in lower concentrations compared to other freshwater mussels.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2024-10-01T05:39:51Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2024-10-01T05:39:51Z (GMT). No. of bitstreams: 0\n Previous issue date: 2024", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "36", "language": "", "element": "format", "qualifier": "extent", "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.title", "value": "Tiesuolan (NaCl) vaikutukset jokihelmisimpukan (Margaritifera margaritifera) poikasten kasvuun, aktiivisuuteen ja selviytymiseen", "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-202410016182", "language": null, "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "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", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Environmental science", "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": "40151", "language": "", "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "tiesuolaus", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "simpukat", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "jokihelmisimpukka", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "poikaset", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "vaikutukset", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "vesist\u00f6vaikutukset", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "vedenlaatu", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "altistuminen", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}]
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