{"id":15533,"date":"2022-10-10T09:59:00","date_gmt":"2022-10-10T07:59:00","guid":{"rendered":"https:\/\/deepseareporter.dev.phosdev.se\/?p=15533"},"modified":"2022-11-14T01:58:33","modified_gmt":"2022-11-14T00:58:33","slug":"urgamla-fiskfossiler-avslojar-vart-ursprung","status":"publish","type":"post","link":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/urgamla-fiskfossiler-avslojar-vart-ursprung\/","title":{"rendered":"Urgamla fiskfossiler avsl\u00f6jar v\u00e5rt ursprung"},"content":{"rendered":"\n

Uppkomsten av de f\u00f6rsta k\u00e4karna med t\u00e4nder var en av de viktigaste h\u00e4ndelserna i livets historia p\u00e5 jorden.<\/p>\n\n\n\n

Nu har forskare i Kina funnit fossil av k\u00e4kf\u00f6rsedda fiskar med den h\u00e4pnadsv\u00e4ckande \u00e5ldern av n\u00e4stan 440 miljoner \u00e5r. De \u00e4r v\u00e5ra \u00e4ldsta k\u00e4nda anm\u00f6drar med t\u00e4nder.<\/p>\n\n\n\n

\"fossil<\/a>
Fanjingshania renovata, en urgammal haj, \u00e4r en av de k\u00e4kf\u00f6rsedda fiskarter som uppt\u00e4ckts i Kina. Foto: Heming Zhang\/AP\/TT<\/b><\/figcaption><\/figure>\n\n\n\n

Vill man h\u00e5rdra det hela en smula skulle man kunna s\u00e4ga att vi alla \u00e4r en slags fiskar. Det var fiskar som tog sig upp p\u00e5 land som gav upphov till groddjur, reptiler och d\u00e4ggdjur, inklusive m\u00e4nniskor. De nyuppt\u00e4ckta fiskarna var b\u00f6rjan p\u00e5 den processen.<\/p>\n\n\n\n

Totalt r\u00f6r det sig om en m\u00e5ngfald av arter, n\u00e5gra av dem perfekt bevarade, i tv\u00e5 fossilf\u00f6rande sediment\u00e4ra lager n\u00e4ra Chongqing i s\u00f6dra delen av Kina, 436 och 439 miljoner \u00e5r gamla.<\/p>\n\n\n\n

Uppt\u00e4ckten, som beskrivs i Nature, visar att de k\u00e4kf\u00f6rsedda fiskarna \u2013 som utvecklades fr\u00e5n primitiva k\u00e4kl\u00f6sa fiskar \u2013 har en l\u00e4ngre historia med r\u00f6tter l\u00e4ngre tillbaka i tiden \u00e4n vad de flesta anat. Studier har antytt att de f\u00f6rsta arterna med \u00e4kta k\u00e4kar uppstod f\u00f6r bort\u00e5t 460\u2013470 miljoner \u00e5r sedan. De nyuppt\u00e4ckta fossilen ligger med andra ord ganska n\u00e4ra den tidpunkt d\u00e5 v\u00e5ra k\u00e4kar och t\u00e4nder s\u00e5g dagens ljus.<\/p>\n\n\n\n

Vi \u00e4r alla benfiskar<\/h2>\n\n\n\n

Moderna k\u00e4kf\u00f6rsedda fiskar tillh\u00f6r tv\u00e5 separata grenar p\u00e5 det evolution\u00e4ra tr\u00e4det, dels broskfiskarna, exempelvis hajar och rockor, dels benfiskarna som innefattar merparten av alla arter \u2013 \u00e5lfiskar, sillfiskar, torskfiskar, laxfiskar, lungfiskar, med flera. Det \u00e4r den senare grenen vi sj\u00e4lva tillh\u00f6r.<\/p>\n\n\n\n

– Vi \u00e4r alla i grunden benfiskar, s\u00e4ger Per Ahlberg, paleontolog vid Uppsala universitet, och en av forskarna bakom beskrivningen av de nya fossilen.<\/p>\n\n\n\n

De \u00e4ldsta t\u00e4nderna<\/h2>\n\n\n\n

Intressant nog finns det tydliga representanter f\u00f6r b\u00e5da linjerna bland de kinesiska fynden. Fyra k\u00e4kf\u00f6rsedda arter beskrivs n\u00e4rmare i Nature, vara tre \u00e4r tydliga hajsl\u00e4ktingar. En av dessa, Qianodus duplicis, bar p\u00e5 t\u00e4nder, de \u00e4ldsta bevis f\u00f6r t\u00e4nder vi k\u00e4nner.<\/p>\n\n\n\n

T\u00e4nderna medf\u00f6rde att en ny v\u00e4rld f\u00f6ddes. De primitiva k\u00e4kl\u00f6sa fiskarna, f\u00f6reg\u00e5ngarna till de k\u00e4kf\u00f6rsedda fiskarna, livn\u00e4rde sig p\u00e5 att dammsuga upp sm\u00e5djur fr\u00e5n havsbottnen. N\u00e4r de riktiga k\u00e4karna och t\u00e4nderna gjorde sin debut var det f\u00f6rsta g\u00e5ngen som ryggradsdjuren blev verkliga rovdjur som kunde bitas och slita itu st\u00f6rre byten.<\/p>\n\n\n\n

– De k\u00e4kf\u00f6rsedda fiskarna gav upphov till riktig predation. Det var f\u00f6rsta g\u00e5ngen v\u00e5ra f\u00f6rf\u00e4der gav sig in p\u00e5 rovdjurssp\u00e5ret, s\u00e4ger Per Ahlberg.<\/p>\n","protected":false},"excerpt":{"rendered":"

Uppkomsten av de f\u00f6rsta k\u00e4karna med t\u00e4nder var en av de viktigaste h\u00e4ndelserna i livets historia p\u00e5 jorden.Nu har forskare i Kina funnit fossil av k\u00e4kf\u00f6rsedda fiskar med den h\u00e4pnadsv\u00e4ckande \u00e5ldern av n\u00e4stan 440 miljoner \u00e5r. De \u00e4r v\u00e5ra \u00e4ldsta k\u00e4nda anm\u00f6drar med t\u00e4nder<\/p>\n","protected":false},"author":4,"featured_media":15079,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[580],"tags":[342,585,586,606,607],"class_list":["post-15533","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-internationellt","tag-fisk","tag-forhistoria","tag-fossil","tag-kina","tag-ursprung"],"acf":[],"yoast_head":"\nUrgamla fiskfossiler avsl\u00f6jar v\u00e5rt ursprung - Deep Sea Reporter<\/title>\n<meta name=\"description\" content=\"Uppkomsten av de f\u00f6rsta k\u00e4karna med t\u00e4nder var en av de viktigaste h\u00e4ndelserna i livets historia p\u00e5 jorden.Nu har forskare i Kina funnit fossil av k\u00e4kf\u00f6rsedda fiskar med den h\u00e4pnadsv\u00e4ckande \u00e5ldern av n\u00e4stan 440 miljoner \u00e5r. 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De \u00e4r v\u00e5ra \u00e4ldsta k\u00e4nda anm\u00f6drar med t\u00e4nder.","breadcrumb":{"@id":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/urgamla-fiskfossiler-avslojar-vart-ursprung\/#breadcrumb"},"inLanguage":"sv-SE","potentialAction":[{"@type":"ReadAction","target":["https:\/\/deepseareporter.dev.phosdev.se\/sv\/urgamla-fiskfossiler-avslojar-vart-ursprung\/"]}]},{"@type":"ImageObject","inLanguage":"sv-SE","@id":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/urgamla-fiskfossiler-avslojar-vart-ursprung\/#primaryimage","url":"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2022\/10\/221010-fiskfossil-1d54847c-a001nh-1280x853-1.jpeg","contentUrl":"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2022\/10\/221010-fiskfossil-1d54847c-a001nh-1280x853-1.jpeg","width":1280,"height":853,"caption":"Denna illustration tillhandah\u00e5llen av Heming Zhang i september 2022 f\u00f6rest\u00e4ller Qianodus duplicis, en av de fossila fiskarna, mer \u00e4n 400 miljoner \u00e5r gamla, som hittades av forskare i s\u00f6dra Kina, tillk\u00e4nnagav i en serie studier publicerade i tidskriften Nature onsdagen, september 28, 2022. 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(Heming Zhang via AP) NY896"},{"@type":"BreadcrumbList","@id":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/urgamla-fiskfossiler-avslojar-vart-ursprung\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Hem","item":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/"},{"@type":"ListItem","position":2,"name":"Urgamla fiskfossiler avsl\u00f6jar v\u00e5rt ursprung"}]},{"@type":"WebSite","@id":"https:\/\/deepseareporter.dev.phosdev.se\/#website","url":"https:\/\/deepseareporter.dev.phosdev.se\/","name":"Deep Sea Reporter","description":"Ett digitalt magasin om havet","publisher":{"@id":"https:\/\/deepseareporter.dev.phosdev.se\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/deepseareporter.dev.phosdev.se\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"sv-SE"},{"@type":"Organization","@id":"https:\/\/deepseareporter.dev.phosdev.se\/#organization","name":"Deep Sea Reporter","url":"https:\/\/deepseareporter.dev.phosdev.se\/","logo":{"@type":"ImageObject","inLanguage":"sv-SE","@id":"https:\/\/deepseareporter.dev.phosdev.se\/#\/schema\/logo\/image\/","url":"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2024\/10\/dsr-bla-ny-logga.svg","contentUrl":"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2024\/10\/dsr-bla-ny-logga.svg","width":834,"height":504,"caption":"Deep Sea Reporter"},"image":{"@id":"https:\/\/deepseareporter.dev.phosdev.se\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/deepseareporter.dev.phosdev.se\/#\/schema\/person\/865c05dbe3b1ab867f4a2046fd083200","name":"Lena Scherman"}]}},"_links":{"self":[{"href":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/wp-json\/wp\/v2\/posts\/15533","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/wp-json\/wp\/v2\/comments?post=15533"}],"version-history":[{"count":0,"href":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/wp-json\/wp\/v2\/posts\/15533\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/wp-json\/wp\/v2\/media\/15079"}],"wp:attachment":[{"href":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/wp-json\/wp\/v2\/media?parent=15533"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/wp-json\/wp\/v2\/categories?post=15533"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/wp-json\/wp\/v2\/tags?post=15533"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}