{"id":23675,"date":"2021-10-22T13:15:18","date_gmt":"2021-10-22T11:15:18","guid":{"rendered":"https:\/\/deepseareporter.dev.phosdev.se\/?p=23675"},"modified":"2025-03-10T09:32:34","modified_gmt":"2025-03-10T08:32:34","slug":"val-och-fiskbajs-kan-minska-den-globala-uppvarmningen","status":"publish","type":"post","link":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/val-och-fiskbajs-kan-minska-den-globala-uppvarmningen\/","title":{"rendered":"Val- och fiskbajs kan minska den globala uppv\u00e4rmningen"},"content":{"rendered":"\n<p>Att haven lagrar koldioxid&nbsp;och v\u00e4rme&nbsp;\u00e4r n\u00e5got som uppm\u00e4rksammats mer och mer de senaste \u00e5ren.&nbsp;Idag&nbsp;uppskattar<a href=\"https:\/\/deepseareporter.dev.phosdev.se\/ipccs-besked-sa-kommer-ett-varmare-hav-paverka-livet-i-norden\/\" target=\"_blank\" rel=\"noreferrer noopener\">&nbsp;forskare<\/a>&nbsp;att haven tar&nbsp;upp 26 procent av koldioxiden&nbsp;vi sl\u00e4pper ut, och havens f\u00f6rm\u00e5ga att binda kol har av forskare beskrivits som en viktig komponent f\u00f6r att stoppa den globala uppv\u00e4rmningen. Nu har det visat sig att \u00e4ven fiskbajs spelar en viktig roll.<\/p>\n\n\n\n<p>Enligt en ny studie publicerad i&nbsp;Science&nbsp;Advances&nbsp;s\u00e5&nbsp;inneh\u00e5ller&nbsp;n\u00e4mligen&nbsp;fiskars bajs&nbsp;en h\u00f6g koncentration av n\u00e4rings\u00e4mnen, men ocks\u00e5 mycket kol.&nbsp;Daniele Bianchi fr\u00e5n University&nbsp;of&nbsp;California \u00e4r en av f\u00f6rfattarna:&nbsp;&nbsp;<\/p>\n\n\n\n<p>\u2013&nbsp;Forskningen&nbsp;har&nbsp;historiskt&nbsp;haft en tendens att&nbsp;endast&nbsp;fokusera p\u00e5 mikroorganismers f\u00f6rm\u00e5ga att binda koldioxid och producera syre, men vi har inte&nbsp;fokuserat lika mycket p\u00e5 st\u00f6rre organismers f\u00f6rm\u00e5ga att ta upp kol. Vi visste sen tidigare att&nbsp;fiskars bajs faktiskt inneh\u00e5ller h\u00f6ga koncentrationer av kol.<\/p>\n\n\n\n<p>D\u00e4rf\u00f6r best\u00e4mde sig forskarna f\u00f6r att unders\u00f6ka det h\u00e4r n\u00e4rmare och se hur mycket kol som faktiskt lagras, globalt, hos de kommersiella fiskarterna.<\/p>\n\n\n\n<p>\u2013&nbsp;Vi vet ungef\u00e4r hur mycket fiskarna bajsar, hur mycket kol det inneh\u00e5ller och \u00e4ven hur snabbt avf\u00f6ringen n\u00e5r botten. Mot den h\u00e4r bakgrunden ville vi d\u00e4rf\u00f6r unders\u00f6ka hur stor p\u00e5verkan&nbsp;det&nbsp;kommersiella fisket&nbsp;har p\u00e5&nbsp;kollagringen&nbsp;i havet.&nbsp;<\/p>\n\n\n\n<p><strong>900 miljoner ton kol lagras varje \u00e5r i fiskbajset&nbsp;<\/strong>&nbsp;<\/p>\n\n\n\n<p>Hur pass&nbsp;bra&nbsp;fiskbajset&nbsp;\u00e4r p\u00e5 att lagra kol beror&nbsp;dels&nbsp;p\u00e5 hur djupt fisken simmar, men&nbsp;ocks\u00e5 p\u00e5&nbsp;hur \u201cfast\u201d&nbsp;sj\u00e4lva avf\u00f6ringen&nbsp;\u00e4r.&nbsp;<\/p>\n\n\n\n<p>\u2013 Ju snabbare&nbsp;den organiska materian&nbsp;sjunker och n\u00e5r botten, desto b\u00e4ttre. F\u00f6r man vill inte att fekalierna ska hinna l\u00f6sas upp i vattnet och konsumeras av&nbsp;exempelvis&nbsp;maneter eller bakterier.&nbsp;F\u00f6r n\u00e5r bajset botten, d\u00e5 kan det lagras d\u00e4r i \u00e5rhundranden.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2021\/10\/ska\u0308rmavbild-2019-12-10-kl.-14.45.20-scaled-1.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1280\" height=\"720\" src=\"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2021\/10\/ska\u0308rmavbild-2019-12-10-kl.-14.45.20-scaled-1-1280x720.jpg\" alt=\"fisk\" class=\"wp-image-3341\" srcset=\"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2021\/10\/ska\u0308rmavbild-2019-12-10-kl.-14.45.20-scaled-1-1280x720.jpg 1280w, https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2021\/10\/ska\u0308rmavbild-2019-12-10-kl.-14.45.20-scaled-1-720x405.jpg 720w, https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2021\/10\/ska\u0308rmavbild-2019-12-10-kl.-14.45.20-scaled-1-768x432.jpg 768w, https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2021\/10\/ska\u0308rmavbild-2019-12-10-kl.-14.45.20-scaled-1-1536x863.jpg 1536w, https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2021\/10\/ska\u0308rmavbild-2019-12-10-kl.-14.45.20-scaled-1-2048x1151.jpg 2048w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/a><figcaption class=\"wp-element-caption\">Ju djupare fisken g\u00f6r sig av med maten, desto b\u00e4ttre, visar forskningen. \nFoto: Johan Candert<\/figcaption><\/figure>\n\n\n\n<p>Genom att anv\u00e4nda sig av statistik fr\u00e5n bland annat FN:s livsmedelsorgan (FAO) s\u00e5 r\u00e4knade forskarna ut att&nbsp;fiskarnas&nbsp;fekalier&nbsp;lagrar&nbsp;900 miljoner ton kol&nbsp;varje \u00e5r.&nbsp;Sen det kommersiella fisket startade har fiskbest\u00e5nden i v\u00e4rldens hav minskat med 50 procent, vilket inneb\u00e4r att m\u00e4ngden kol som lagras p\u00e5 havets botten ocks\u00e5 har minskat.<\/p>\n\n\n\n<p>\u2013&nbsp;Det \u00e4r viktigt&nbsp;att veta att allt fiske kommer ha sin p\u00e5verkan p\u00e5 biomassan p\u00e5 ett eller annat s\u00e4tt, och jag&nbsp;\u00e4r inte den som&nbsp;kalkylerar&nbsp;kostnaden eller nyttan fr\u00e5n fisket.&nbsp;Men jag skulle s\u00e4ga att v\u00e5r studie belyser&nbsp;hur&nbsp;viktigt&nbsp;det \u00e4r att ocks\u00e5 t\u00e4nka p\u00e5 de ekosystemtj\u00e4nster livet i havet ger oss.&nbsp;<\/p>\n\n\n\n<p>Daniele Bianchi&nbsp;\u00e4r ocks\u00e5 noga med att p\u00e5peka att det finns&nbsp;vissa fallgropar i studien,&nbsp;som han \u00f6nskar att framtida forskning unders\u00f6ker n\u00e4rmare.&nbsp;Exempelvis s\u00e5 \u00e4r m\u00e5nga av de kommersiella fiskarna ocks\u00e5 rovfiskar, som \u00e4ter andra fiskar. <\/p>\n\n\n\n<p>\u2013 Det vi inte har r\u00e4knat p\u00e5 \u00e4r vad som h\u00e4nder med fiskarna l\u00e4gre ner i n\u00e4ringskedjan. Kompenserar de&nbsp;mindre fiskarna&nbsp;f\u00f6r&nbsp;kolupptagningen&nbsp;p\u00e5 n\u00e5got s\u00e4tt? Det&nbsp;vet vi inte idag.&nbsp;<\/p>\n\n\n\n<p><strong>\u00c4ven valars avf\u00f6ring \u00e4r viktig f\u00f6r havet<\/strong>&nbsp;<\/p>\n\n\n\n<p>Tro det eller ej, men den h\u00e4r bajsstudien \u00e4r inte den f\u00f6rsta i sitt slag.\u00a02019\u00a0visade\u00a0<a href=\"https:\/\/www.imf.org\/external\/pubs\/ft\/fandd\/2019\/12\/pdf\/natures-solution-to-climate-change-chami.pdf\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">en studie<\/a>\u00a0att\u00a0\u00e4ven\u00a0valars avf\u00f6ring\u00a0p\u00e5verkar havets ekosystem.<\/p>\n\n\n\n<p>\u2013&nbsp;Det som g\u00f6r valens&nbsp;fekalier intressant \u00e4r&nbsp;m\u00e4ngden n\u00e4rings\u00e4mnen som finns d\u00e4r. Valar&nbsp;f\u00e4rdas v\u00e4ldigt l\u00e5nga str\u00e4ckor&nbsp;och under den h\u00e4r&nbsp;resan&nbsp;hinner de ta upp n\u00e4rings\u00e4mnen fr\u00e5n en m\u00e4ngd platser.&nbsp;<\/p>\n\n\n\n<p>Bianchi tar upp&nbsp;Sydpolen&nbsp;som ett exempel d\u00e4r valars avf\u00f6ring kan spela en avg\u00f6rande roll i ekosystemet. Men d\u00e5 ska valarna, till skillnad fr\u00e5n fiskarna, utr\u00e4tta sina behov vid ytan.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2021\/10\/sdlno6vsdfvafs-nh-scaled-1.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1280\" height=\"817\" src=\"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2021\/10\/sdlno6vsdfvafs-nh-scaled-1-1280x817.jpg\" alt=\"valar\" class=\"wp-image-3348\" srcset=\"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2021\/10\/sdlno6vsdfvafs-nh-scaled-1-1280x817.jpg 1280w, https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2021\/10\/sdlno6vsdfvafs-nh-scaled-1-720x460.jpg 720w, https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2021\/10\/sdlno6vsdfvafs-nh-scaled-1-768x490.jpg 768w, https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2021\/10\/sdlno6vsdfvafs-nh-scaled-1-1536x980.jpg 1536w, https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2021\/10\/sdlno6vsdfvafs-nh-scaled-1-2048x1307.jpg 2048w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/a><figcaption class=\"wp-element-caption\">Det har \u00e4ven gjorts studier p\u00e5 valars bajs. \nFoto: Pablo Cozzaglio \/ AFP \/ TT Bild<\/figcaption><\/figure>\n\n\n\n<p>\u2013&nbsp;I Antarktis&nbsp;\u00e4r&nbsp;exempelvis m\u00e4ngden j\u00e4rn&nbsp;vid vattenytan&nbsp;v\u00e4ldigt l\u00e5g. Men om en val d\u00e5 har \u00e4tit p\u00e5 ett djup&nbsp;d\u00e4r dessa n\u00e4rings\u00e4mnen finns,&nbsp;eller tagit med sig&nbsp;det&nbsp;fr\u00e5n ett annat hav, s\u00e5 kan den avf\u00f6ringen&nbsp;str\u00f6ssla&nbsp;lite j\u00e4rn i ett ekosystem som annars inte hade haft det. Och det i sin tur ger en&nbsp;\u00f6kad produktion av&nbsp;fytoplankton, allts\u00e5 alger. <\/p>\n\n\n\n<p>Ju mer alger&nbsp;som finns, desto mer mat finns det f\u00f6r kr\u00e4ftdjur och krill,&nbsp;som m\u00e5nga fiskar i sin tur tycker om att \u00e4ta.<\/p>\n\n\n\n<p><strong>M\u00e4ngden fisk p\u00e5verkar havens kemiska sammans\u00e4ttning<\/strong>&nbsp;<\/p>\n\n\n\n<p>F\u00f6r oceanografen&nbsp;ger de&nbsp;tv\u00e5 studierna&nbsp;en \u00f6verblick&nbsp;\u00f6ver det marina ekosystems gr\u00e5skala.&nbsp;<\/p>\n\n\n\n<p>\u2013&nbsp;&nbsp;Om du vill lagra s\u00e5 mycket koldioxid som m\u00f6jligt, d\u00e5 hade du velat att alla djur \u00e5ker ner till havsbotten&nbsp;f\u00f6r att g\u00f6ra sig av med sin mat. Men&nbsp;hade det&nbsp;varit&nbsp;s\u00e5, s\u00e5&nbsp;hade vi f\u00f6rlorat en stor m\u00e4ngd&nbsp;n\u00e4rings\u00e4mnena p\u00e5 ytan, och dem vet vi ju att&nbsp;ekosystemet&nbsp;beh\u00f6ver&nbsp;f\u00f6r att fungera. S\u00e5 det \u00e4r komplext, men det \u00e4r ocks\u00e5 det som \u00e4r sk\u00f6nheten i biokemi.<\/p>\n\n\n\n<p>Daniele Bianchi&nbsp;s\u00e4ger att han&nbsp;och hans kollegor under forskningen&nbsp;ins\u00e5g att det finns v\u00e4ldigt detaljerade studier om specifika fisksorter, men att den \u00f6vergripande forskningen om fisk \u00e4r v\u00e4ldigt l\u00e5g.&nbsp;<\/p>\n\n\n\n<p>\u2013&nbsp;F\u00f6r mig \u00e4r det tydligt&nbsp;att vi&nbsp;beh\u00f6ver en b\u00e4ttre f\u00f6rst\u00e5else f\u00f6r&nbsp;hur v\u00e5rt fiske p\u00e5verkar havens kemiska sammans\u00e4ttning.&nbsp;Nu&nbsp;f\u00f6rst\u00e5r vi kanske p\u00e5 ett nytt s\u00e4tt att det kan vara en f\u00f6rdel f\u00f6r m\u00e4nniskan att ha en viss m\u00e4ngd fisk kvar i havet.&nbsp;Jag&nbsp;hoppas&nbsp;d\u00e4rf\u00f6r&nbsp;att flera forskare unders\u00f6ker det h\u00e4r s\u00e5 att vi&nbsp;en dag&nbsp;kan&nbsp;ha&nbsp;det&nbsp;i \u00e5tanke n\u00e4r&nbsp;vi tar beslut om hur vi hanterar v\u00e5ra ekosystem.&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&#8221;Vi vet ungef\u00e4r hur mycket fiskarna bajsar, hur mycket kol det inneh\u00e5ller och \u00e4ven hur snabbt avf\u00f6ringen n\u00e5r botten. Mot den h\u00e4r bakgrunden ville vi d\u00e4rf\u00f6r unders\u00f6ka hur stor p\u00e5verkan\u00a0har det\u00a0kommersiella fisket\u00a0har p\u00e5\u00a0kollagringen\u00a0i havet&#8221;, s\u00e4ger Daniele Bianchi fr\u00e5n University\u00a0of\u00a0California<\/p>\n","protected":false},"author":3,"featured_media":3341,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[252],"tags":[361,236,895,1394],"class_list":["post-23675","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-forskning","tag-fiskbajs","tag-fiske","tag-val","tag-varmare-hav"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Val- och fiskbajs kan minska den globala uppv\u00e4rmningen - Deep Sea Reporter<\/title>\n<meta name=\"description\" content=\"\u2013 Vi vet ungef\u00e4r hur mycket fiskarna bajsar, hur mycket kol det inneh\u00e5ller och \u00e4ven hur snabbt avf\u00f6ringen n\u00e5r botten. Mot den h\u00e4r bakgrunden ville vi d\u00e4rf\u00f6r unders\u00f6ka hur stor p\u00e5verkan\u00a0har det\u00a0kommersiella fisket\u00a0har p\u00e5\u00a0kollagringen\u00a0i havet, s\u00e4ger Daniele Bianchi fr\u00e5n University\u00a0of\u00a0California.\" \/>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"sv_SE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Val- och fiskbajs kan minska den globala uppv\u00e4rmningen\" \/>\n<meta property=\"og:description\" content=\"\u2013\u00a0Vi vet ungef\u00e4r hur mycket fiskarna bajsar, hur mycket kol det inneh\u00e5ller och \u00e4ven hur snabbt avf\u00f6ringen n\u00e5r botten. 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