{"id":302,"date":"2025-07-25T16:25:18","date_gmt":"2025-07-25T16:25:18","guid":{"rendered":"https:\/\/www.vedet.toutestbleu.info\/?p=302"},"modified":"2025-07-25T16:25:18","modified_gmt":"2025-07-25T16:25:18","slug":"tutkimus-happikato-jaa-jarven-ekologiseen-muistiin","status":"publish","type":"post","link":"https:\/\/www.vedet.toutestbleu.info\/index.php\/2025\/07\/25\/tutkimus-happikato-jaa-jarven-ekologiseen-muistiin\/","title":{"rendered":"TUTKIMUS: Happikato j\u00e4\u00e4 j\u00e4rven ekologiseen muistiin"},"content":{"rendered":"<p>Vaikka j\u00e4\u00e4peitteinen aika on lyhentynyt ilmaston l\u00e4mmetess\u00e4, ei kaikkien j\u00e4rvien happitilanne ole parantunut.<\/p>\n<p>Kun j\u00e4rvi on j\u00e4\u00e4ss\u00e4, niin kaloille ja muille vesiel\u00e4imille elint\u00e4rke\u00e4n hapen m\u00e4\u00e4r\u00e4 v\u00e4henee. J\u00e4\u00e4 ja lumi est\u00e4v\u00e4t ilman ja veden sekoittumisen sek\u00e4 rajoittavat hapen tuotantoa fotosynteesin kautta.<\/p>\n<p>Laaja tutkimus paljasti, ett\u00e4 pienten j\u00e4rvien happipitoisuus ei kasva, vaikka j\u00e4\u00e4peitteinen aika lyhentynyt. Isompien, yli 10 km\u00b2:n j\u00e4rvien tilanne kohdalla tilanne on toinen. Tulokset on julkaistu \u00e4skett\u00e4in\u00a0<a href=\"https:\/\/doi.org\/10.1073\/pnas.2426140122\" target=\"_blank\" rel=\"noopener\">PNAS<\/a>\u00a0-tiedelehdess\u00e4.<\/p>\n<p>Helsingin yliopiston tutkijatohtori\u00a0<a href=\"https:\/\/www.helsinki.fi\/fi\/tutustu-meihin\/ihmiset\/henkilohaku\/joachim-jansen-9494168\">Joachim Jansenin\u00a0<\/a>johtama kansainv\u00e4linen tutkimusryhm\u00e4 hy\u00f6dynsi tietoja, jotka oli vuosien 1960-2022 v\u00e4lisen\u00e4 aikana ker\u00e4tty tuhansista j\u00e4rvist\u00e4, mukana oli my\u00f6s suomalaisia j\u00e4rvi\u00e4.<\/p>\n<p>Yleisesti ottaen lyhyempi j\u00e4\u00e4peite lis\u00e4si hapen m\u00e4\u00e4r\u00e4\u00e4, koska talvinen hapenkulutusjakso lyheni ja syksyinen pintaveden ja hapen sekoittuminen kesti pidemp\u00e4\u00e4n.<\/p>\n<p>Pieniss\u00e4 j\u00e4rviss\u00e4, jollaisia ovat useimmat Suomen j\u00e4rvet, kes\u00e4n aikana pintavesiin ei kuitenkaan sekoitu riitt\u00e4v\u00e4sti happea. T\u00e4m\u00e4n vuodenaikojen v\u00e4lisen ekologisen muistin seurauksena j\u00e4\u00e4n alla olevat hapettomat vy\u00f6hykkeet ovat laajentuneet.<\/p>\n<p>Tilanne on erityisen ongelmallinen rehev\u00f6ityneiss\u00e4 j\u00e4rviss\u00e4, joissa hapenkulutus on suurta. Sen sijaan v\u00e4h\u00e4ravinteisissa j\u00e4rviss\u00e4 hapenpuutetta esiintyy harvemmin kes\u00e4ll\u00e4 ja talvella.<\/p>\n<p>Talvisten kalakuolemien m\u00e4\u00e4r\u00e4 saattaa v\u00e4henty\u00e4 j\u00e4\u00e4n v\u00e4hetess\u00e4 vain suuremmissa, yli 10 km\u00b2:n kokoisissa pohjoisissa j\u00e4rviss\u00e4.<\/p>\n<p>\u2013\u00a0Tulokset osoittavat, ett\u00e4 ilmastonmuutoksen vaikutukset eiv\u00e4t ole yksiselitteisesti positiivisia tai negatiivisia \u2013 ne riippuvat j\u00e4rven koosta ja ominaisuuksista, sanoo Joachim Jansen.<\/p>\n<p>Tutkimus antaa t\u00e4rke\u00e4\u00e4 tietoa j\u00e4rvien suojeluun ja kalakantojen hallintaan muuttuvassa ilmastossa.<\/p>\n<p><strong>Yhteenveto:<\/strong><\/p>\n<ul type=\"disc\">\n<li>Suurissa j\u00e4rviss\u00e4 (yli 10 km\u00b2) havaitaan positiivinen kehitys j\u00e4\u00e4nalaisessa happitilanteessa, koska j\u00e4\u00e4peitteen kesto lyhenee nopeasti ja kes\u00e4aikainen happikato on v\u00e4h\u00e4ist\u00e4.<\/li>\n<li>Pieniss\u00e4 j\u00e4rviss\u00e4 (alle 1 km\u00b2) havaitaan negatiivinen kehitys j\u00e4\u00e4nalaisessa happitilanteessa, koska merkitt\u00e4v\u00e4 kes\u00e4aikainen happikato siirtyy talvikaudelle.<\/li>\n<li>Keskikokoisissa j\u00e4rviss\u00e4 ei havaita merkitt\u00e4v\u00e4\u00e4 muutosta veden happipitoisuudessa, koska kaksi vaikuttavaa tekij\u00e4\u00e4 \u2013 ekologinen muisti ja j\u00e4\u00e4peitteen lyheneminen \u2013 kumoavat toisensa.<\/li>\n<\/ul>\n<p>L\u00e4hde:<br \/>\nJ. Jansen, G.A. Weyhenmeyer, L.H. H\u00e4rk\u00f6nen, A.M. Paterson, P.A. del Giorgio, &amp; Y.T. Prairie,\u00a0 Divergent oxygen trends in ice-covered lakes driven by ice-cover decline and ecological memory,\u00a0<em>Proc. Natl. Acad. Sci. U.S.A.\u00a0<\/em>122 (27) e2426140122,\u00a0<a href=\"https:\/\/doi.org\/10.1073\/pnas.2426140122\" target=\"_blank\" rel=\"noopener\">https:\/\/doi.org\/10.1073\/pnas.2426140122<\/a><\/p>\n<div style=\"margin-top: 0px; margin-bottom: 0px;\" class=\"sharethis-inline-share-buttons\" ><\/div>","protected":false},"excerpt":{"rendered":"<div class=\"mh-excerpt\"><p>Vaikka j\u00e4\u00e4peitteinen aika on lyhentynyt ilmaston l\u00e4mmetess\u00e4, ei kaikkien j\u00e4rvien happitilanne ole parantunut. Kun j\u00e4rvi on j\u00e4\u00e4ss\u00e4, niin kaloille ja muille vesiel\u00e4imille elint\u00e4rke\u00e4n hapen m\u00e4\u00e4r\u00e4 <a class=\"mh-excerpt-more\" href=\"https:\/\/www.vedet.toutestbleu.info\/index.php\/2025\/07\/25\/tutkimus-happikato-jaa-jarven-ekologiseen-muistiin\/\" title=\"TUTKIMUS: Happikato j\u00e4\u00e4 j\u00e4rven ekologiseen muistiin\">[&#8230;]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":303,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[50],"tags":[],"class_list":["post-302","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutkimukset"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>TUTKIMUS: Happikato j\u00e4\u00e4 j\u00e4rven ekologiseen muistiin - Suvi P\u00e4ivikki - Vesist\u00f6uutiset<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.vedet.toutestbleu.info\/index.php\/2025\/07\/25\/tutkimus-happikato-jaa-jarven-ekologiseen-muistiin\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"TUTKIMUS: Happikato j\u00e4\u00e4 j\u00e4rven ekologiseen muistiin - Suvi P\u00e4ivikki - Vesist\u00f6uutiset\" \/>\n<meta property=\"og:description\" content=\"Vaikka j\u00e4\u00e4peitteinen aika on lyhentynyt ilmaston l\u00e4mmetess\u00e4, ei kaikkien j\u00e4rvien happitilanne ole parantunut. 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