{"id":665851,"date":"2025-12-12T06:06:04","date_gmt":"2025-12-12T06:06:04","guid":{"rendered":"https:\/\/microscopemedia.com\/?p=665851"},"modified":"2025-12-12T06:06:04","modified_gmt":"2025-12-12T06:06:04","slug":"modificari-in-adn-ul-ursilor-polari-ar-putea-ajuta-specia-sa-se-adapteze-la-incalzirea-globala","status":"publish","type":"post","link":"https:\/\/microscopemedia.com\/?p=665851","title":{"rendered":"Modific\u0103ri \u00een ADN-ul ur\u0219ilor polari ar putea ajuta specia s\u0103 se adapteze la \u00eenc\u0103lzirea global\u0103"},"content":{"rendered":"
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Ur\u0219ii polari<\/strong>, considera\u021bi printre speciile cele mai vulnerabile la \u00eenc\u0103lzirea global\u0103, ar putea avea totu\u0219i o capacitate biologic\u0103 nea\u0219teptat\u0103 de adaptare.<\/p>\n

Un studiu al Universit\u0103\u021bii din East Anglia, publicat vineri \u00een revista Mobile DNA \u0219i The Guardian, a identificat schimb\u0103ri \u00een ADN-ul ur\u0219ilor polari care tr\u0103iesc \u00een sud-estul Groenlandei, regiunea cea mai cald\u0103 \u0219i mai pu\u021bin \u00eenghe\u021bat\u0103 a \u021b\u0103rii.<\/p>\n

Aceste modific\u0103ri, ap\u0103rute \u00een gene asociate cu stresul termic, \u00eemb\u0103tr\u00e2nirea \u0219i metabolismul, sugereaz\u0103 c\u0103 animalele \u00ee\u0219i ajusteaz\u0103 func\u021biile biologice pentru a supravie\u021bui temperaturilor \u00een cre\u0219tere.<\/p>\n

Ce spun cercet\u0103torii?<\/strong><\/p>\n

Cercet\u0103torii au analizat probe de s\u00e2nge provenite de la dou\u0103 popula\u021bii de ur\u0219i, una din sud-estul Groenlandei \u0219i una din nord, concentr\u00e2ndu-se pe a\u0219a-numitele \u201ejumping genes\u201d, fragmente mobile ale genomului care pot influen\u021ba modul de func\u021bionare al altor gene.<\/p>\n

\u00cen sud, unde clima este mai cald\u0103 \u0219i mai variabil\u0103, aceste \u201egene s\u0103ritoare\u201d erau mult mai active, indic\u00e2nd modific\u0103ri genetice accelerate de stresul climatic.<\/p>\n

\u201eCre\u0219terea temperaturilor determin\u0103 o activare dramatic\u0103 a acestor gene mobile \u00een ADN-ul ur\u0219ilor din sud-estul Groenlandei\u201d<\/strong>, a explicat dr. Alice Godden, coordonatoarea studiului.<\/p>\n

Ea spune c\u0103 acest mecanism ar putea reprezenta o adaptare de urgen\u021b\u0103 la dispari\u021bia ghe\u021bii marine, de care depinde supravie\u021buirea ur\u0219ilor polari.<\/p>\n

Modific\u0103rile genetice au fost observate \u0219i \u00een zone legate de procesarea gr\u0103similor, un poten\u021bial avantaj \u00een contextul schimb\u0103rii alimenta\u021biei.<\/p>\n

\u00cen sud-est, unde ur\u0219ii au acces redus la foci, dieta lor este mai slab\u0103 \u0219i par\u021bial vegetal\u0103, iar ADN-ul lor pare s\u0103 se adapteze la aceste condi\u021bii.<\/p>\n

Cercet\u0103torii subliniaz\u0103 \u00eens\u0103 c\u0103, de\u0219i descoperirea ofer\u0103 o raz\u0103 de speran\u021b\u0103, ea nu reduce riscurile majore cu care se confrunt\u0103 specia: dou\u0103 treimi dintre ur\u0219ii polari ar putea disp\u0103rea p\u00e2n\u0103 \u00een 2050, pe fondul topirii accelerate a ghe\u021bii arctice.<\/p>\n

\u201eNu trebuie s\u0103 fim compl\u0103cu\u021bi. Chiar dac\u0103 observ\u0103m unele semne de adaptare, ur\u0219ii polari r\u0103m\u00e2n extrem de vulnerabili. Opri\u021bi cre\u0219terea temperaturilor, altfel aceste mecanisme nu vor fi suficiente\u201d, a avertizat Godden.<\/p>\n

Urm\u0103torul pas al echipei este analizarea celor 20 de popula\u021bii de ur\u0219i polari din lume pentru a vedea dac\u0103 acelea\u0219i schimb\u0103ri genetice apar \u0219i \u00een alte regiuni ale Arcticii.<\/p>\n","protected":false},"excerpt":{"rendered":"

Ur\u0219ii polari, considera\u021bi printre speciile cele mai vulnerabile la \u00eenc\u0103lzirea global\u0103, ar putea avea totu\u0219i o capacitate biologic\u0103 nea\u0219teptat\u0103 de adaptare. Un studiu al Universit\u0103\u021bii din East Anglia, publicat vineri … Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":665852,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"Default","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/posts\/665851"}],"collection":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=665851"}],"version-history":[{"count":0,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/posts\/665851\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/media\/665852"}],"wp:attachment":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=665851"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=665851"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=665851"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}