{"id":37348,"date":"2024-10-22T10:33:42","date_gmt":"2024-10-22T08:33:42","guid":{"rendered":"https:\/\/deepseareporter.dev.phosdev.se\/?p=37348"},"modified":"2025-02-26T12:14:30","modified_gmt":"2025-02-26T11:14:30","slug":"evolution-i-raketfart-forvanar-hoppingivande","status":"publish","type":"post","link":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/evolution-i-raketfart-forvanar-hoppingivande\/","title":{"rendered":"Evolution i raketfart f\u00f6rv\u00e5nar: &#8221;Hoppingivande&#8221; (TT)"},"content":{"rendered":"\n<p><strong>Fr\u00e5n stor och r\u00e4dd till liten och modig \u2013 evolutionen har g\u00e5tt i raketfart p\u00e5 en kobbe i Kosterhavet.<\/strong><\/p>\n\n\n\n<p><strong>Strandsn\u00e4ckans snabba anpassning efter ett p\u00e5tvingat milj\u00f6ombyte f\u00f6rv\u00e5nar forskarna. P\u00e5 30 \u00e5r har den bytt b\u00e5de utseende och beteende f\u00f6r att \u00f6verleva.<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1280\" height=\"736\" src=\"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2024\/10\/241021-ttvpsnackevolutionkorr-6ab2b2cc-a001nh-1280x736.jpeg\" alt=\"\" class=\"wp-image-37349\" srcset=\"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2024\/10\/241021-ttvpsnackevolutionkorr-6ab2b2cc-a001nh-1280x736.jpeg 1280w, https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2024\/10\/241021-ttvpsnackevolutionkorr-6ab2b2cc-a001nh-720x414.jpeg 720w, https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2024\/10\/241021-ttvpsnackevolutionkorr-6ab2b2cc-a001nh-768x441.jpeg 768w, https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2024\/10\/241021-ttvpsnackevolutionkorr-6ab2b2cc-a001nh.jpeg 1500w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><figcaption class=\"wp-element-caption\">Den stora strandsn\u00e4ckan till v\u00e4nster \u00e4r en krabbsn\u00e4cka, som g\u00f6mmer sig i sitt skal, st\u00e4ndigt beredd p\u00e5 att bli attackerad av krabbor. Den lilla strandsn\u00e4ckan till h\u00f6ger \u00e4r en v\u00e5gsn\u00e4cka, anpassad till en milj\u00f6 med stora havsv\u00e5gor. Foto: David Carmelet<\/figcaption><\/figure>\n\n\n\n<p>Det v\u00e4cker hopp, tycker Kerstin Johannesson, professor i marin ekologi vid G\u00f6teborgs universitet.<\/p>\n\n\n\n<p>&#8211; Det ger ju \u00e4nd\u00e5 lite hopp i de tider vi lever i nu. Vi \u00e4ndrar p\u00e5 milj\u00f6n med en ruskig hastighet, s\u00e4ger hon och syftar p\u00e5 klimatf\u00f6r\u00e4ndringar och milj\u00f6f\u00f6rst\u00f6ring.<\/p>\n\n\n\n<p>M\u00e5nga arter p\u00e5verkas n\u00e4r den omgivande milj\u00f6n f\u00f6r\u00e4ndras. F\u00f6r vissa arter kan l\u00f6sningen bli att flytta.<\/p>\n\n\n\n<p>Men det g\u00e5r inte alltid. Det h\u00e4r att de skulle kunna anpassa sig v\u00e4cker hopp.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-dodades-i-algblomning\">D\u00f6dades i algblomning<\/h2>\n\n\n\n<p>N\u00e4r en ovanligt kraftig algblomning drabbade V\u00e4stkusten 1988 och slog ut best\u00e5ndet av strandsn\u00e4ckor som levt i br\u00e4nningarna p\u00e5 en liten kobbe, passade hon p\u00e5 att inleda ett experiment.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1280\" height=\"960\" src=\"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2024\/10\/241021-ttvpsnackevolutionkorr-6ab2b2cc-a002nh-1280x960.jpeg\" alt=\"\" class=\"wp-image-37351\" srcset=\"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2024\/10\/241021-ttvpsnackevolutionkorr-6ab2b2cc-a002nh-1280x960.jpeg 1280w, https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2024\/10\/241021-ttvpsnackevolutionkorr-6ab2b2cc-a002nh-720x540.jpeg 720w, https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2024\/10\/241021-ttvpsnackevolutionkorr-6ab2b2cc-a002nh-768x576.jpeg 768w, https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2024\/10\/241021-ttvpsnackevolutionkorr-6ab2b2cc-a002nh.jpeg 1500w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><figcaption class=\"wp-element-caption\">Kerstin Johannesson, professor i marin ekologi p\u00e5 G\u00f6teborgs universitet, p\u00e5 en kobbe i Kosterhavet. Foto: Bo Johannesson<\/figcaption><\/figure>\n\n\n\n<p>De utslagna sn\u00e4ckorna ersatte hon med en annan variant av strandsn\u00e4ckor, som flyttades till kobben. Flyttstr\u00e4ckan var bara n\u00e5gra hundra meter inom samma sk\u00e4rg\u00e5rd, men det var ett omtumlande milj\u00f6ombyte, som hon trodde skulle vara sv\u00e5rt f\u00f6r de nyinflyttade sn\u00e4ckorna att \u00f6verleva.<\/p>\n\n\n\n<p>De var n\u00e4mligen utformade f\u00f6r att klara en tillvaro omgivna av hungriga krabbor: De var utrustade med ett stort och starkt skal och var samtidigt extremt f\u00f6rsiktiga, st\u00e4ndigt beredda p\u00e5 att bli anfallna av en krabba.<\/p>\n\n\n\n<p>Nu kom de i st\u00e4llet till en milj\u00f6 d\u00e4r utmaningen var att klara kraftiga havsv\u00e5gor. Deras f\u00f6reg\u00e5ngare, som d\u00f6tt i algblomningen, hade varit anpassade till detta liv \u2014 de var sm\u00e5, hade tunna skal och var tvungna att agera dj\u00e4rvt f\u00f6r att hela tiden hitta st\u00e4llen att suga sig fast p\u00e5 i br\u00e4nningarna.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-langtgaende-anpassning\">L\u00e5ngtg\u00e5ende anpassning<\/h2>\n\n\n\n<p>De fullvuxna, omplacerade sn\u00e4ckorna dog efter flytten. Men innan dess hade honsn\u00e4ckorna hunnit sl\u00e4ppa ifr\u00e5n sig avkommor i halvmillimetersstorlek. N\u00e5gra av dessa minisn\u00e4ckor \u00f6verlevde och kunde f\u00f6r\u00f6ka sig, tack vare slumrande gener i beredskap.<\/p>\n\n\n\n<p>&#8211; Sorteringen i b\u00f6rjan tog d\u00f6d p\u00e5 m\u00e5nga av de sm\u00e5, men n\u00e5gra stycken klarade sig och efter hand blev de fler och fler, s\u00e4ger Kerstin Johannesson.<\/p>\n\n\n\n<p>Efter cirka 30 generationer har anpassningen till den nya milj\u00f6n g\u00e5tt s\u00e5 l\u00e5ngt att krabbsn\u00e4ckorna nu liknar sina f\u00f6reg\u00e5ngare p\u00e5 kobben in i minsta detalj.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1280\" height=\"506\" src=\"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2024\/10\/241021-ttvpsnackevolutionkorr-6ab2b2cc-a003nh-1280x506.jpeg\" alt=\"\" class=\"wp-image-37353\" srcset=\"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2024\/10\/241021-ttvpsnackevolutionkorr-6ab2b2cc-a003nh-1280x506.jpeg 1280w, https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2024\/10\/241021-ttvpsnackevolutionkorr-6ab2b2cc-a003nh-720x284.jpeg 720w, https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2024\/10\/241021-ttvpsnackevolutionkorr-6ab2b2cc-a003nh-768x303.jpeg 768w, https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2024\/10\/241021-ttvpsnackevolutionkorr-6ab2b2cc-a003nh-1536x607.jpeg 1536w, https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2024\/10\/241021-ttvpsnackevolutionkorr-6ab2b2cc-a003nh.jpeg 2000w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><figcaption class=\"wp-element-caption\">Strandsn\u00e4ckor p\u00e5 klippa. Foto: Daria Shipilina<\/figcaption><\/figure>\n\n\n\n<p>&#8211; En f\u00f6ruts\u00e4ttning f\u00f6r en s\u00e5dan anpassning \u00e4r att det finns en genetisk variation, konstaterar Kerstin Johannesson. En del av de stora krabbsn\u00e4ckorna b\u00e4r p\u00e5 de gener som beh\u00f6vs f\u00f6r att bli en liten v\u00e5gsn\u00e4cka.<\/p>\n\n\n\n<p>N\u00e4r man flyttar dem s\u00e5 kommer de h\u00e4r generna att bli v\u00e4ldigt, v\u00e4ldigt anv\u00e4ndbara. Deras avkommor f\u00e5r en f\u00f6rdel och \u00f6verlever.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-foranderlig-varld\">F\u00f6r\u00e4nderlig v\u00e4rld<\/h2>\n\n\n\n<p>&#8211; Det visar p\u00e5 vikten av genetisk variation f\u00f6r att en art ska kunna klara sig i en f\u00f6r\u00e4nderlig v\u00e4rld, framh\u00e5ller hon.<\/p>\n\n\n\n<p>Det \u00e4r d\u00e4rf\u00f6r till exempel den svenska vargstammen blir s\u00e5rbar om vargarna \u00e4r f\u00e5 och alla vargar \u00e4r sl\u00e4kt med varandra. Det minskar sannolikheten f\u00f6r att de ska b\u00e4ra med sig den bredd av olika anlag som beh\u00f6vs i en situation d\u00e4r milj\u00f6n f\u00f6r\u00e4ndras.<\/p>\n\n\n\n<p>&#8211; Du kan t\u00e4nka p\u00e5 torsken i \u00d6stersj\u00f6n eller n\u00e5gon annan art som i normala fall naturligt skulle vara v\u00e4ldigt m\u00e5nga individer, men d\u00e4r vi har tryckt tillbaka dem och de inte \u00e4r s\u00e5 m\u00e5nga l\u00e4ngre, d\u00e5 minskar man deras m\u00f6jligheter att \u00f6verleva milj\u00f6f\u00f6r\u00e4ndringar, s\u00e4ger Kerstin Johannesson.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-darwins-ideer\">Darwins id\u00e9er<\/h2>\n\n\n\n<p>Sn\u00e4ckstudien, som publicerats i den vetenskapliga tidskriften\u00a0<a href=\"https:\/\/www.science.org\/doi\/10.1126\/sciadv.adp2102\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Science Advances<\/a>, \u00e4r en av de f\u00f6rsta i sitt slag.<\/p>\n\n\n\n<p>I USA har liknande snabba anpassningar till en ny milj\u00f6 belysts i studier p\u00e5 fiskar. I det ena fallet var det ett vulkanutbrott som omskapade milj\u00f6n. Fiskar fr\u00e5n havet kom in och anpassade sig till livet i en nybildad sj\u00f6. I den andra fiskstudien f\u00f6ljde forskarna hur en fiskart anpassade sig n\u00e4r flodvattnet de levde i blev kraftigt f\u00f6rorenat.<\/p>\n\n\n\n<p>&#8211; Att det \u00f6ver huvud taget sker \u00e4r inte f\u00f6rv\u00e5nande, f\u00f6r det \u00e4r ju Darwins id\u00e9er fr\u00e5n b\u00f6rjan till slut h\u00e4r: naturlig selektion som \u00e4ndrar p\u00e5 organismer. Att det kan g\u00e5 s\u00e5 superfort \u00e4r det som \u00e4r f\u00f6rv\u00e5nande, s\u00e4ger Kerstin Johannesson.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Fr\u00e5n stor och r\u00e4dd till liten och modig \u2013 evolutionen har g\u00e5tt i raketfart p\u00e5 en kobbe i Kosterhavet.<br \/>\nStrandsn\u00e4ckans snabba anpassning efter ett p\u00e5tvingat milj\u00f6ombyte f\u00f6rv\u00e5nar forskarna. P\u00e5 30 \u00e5r har den bytt b\u00e5de utseende och beteende f\u00f6r att \u00f6verleva.<\/p>\n","protected":false},"author":4,"featured_media":37353,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[252],"tags":[2882,2883,1304,1808,2885,2884,2881],"class_list":["post-37348","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-forskning","tag-darwin","tag-evolution","tag-goteborgs-universitet","tag-kosterhavet","tag-marin-ekologi","tag-strandsnacka","tag-vivipar-strandsnacka"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Evolution i raketfart f\u00f6rv\u00e5nar: &quot;Hoppingivande&quot; (TT) - Deep Sea Reporter<\/title>\n<meta name=\"description\" content=\"Fr\u00e5n stor och r\u00e4dd till liten och modig \u2013 evolutionen har g\u00e5tt i raketfart p\u00e5 en kobbe i Kosterhavet.Strandsn\u00e4ckans snabba anpassning efter ett p\u00e5tvingat milj\u00f6ombyte f\u00f6rv\u00e5nar forskarna. 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