Yeni \u00e7al\u0131\u015fmaya g\u00f6re deniz y\u0131lanlar\u0131 de\u011fi\u015fen \u0131\u015f\u0131k ko\u015fullar\u0131na uyum sa\u011flamak i\u00e7in 15 milyon y\u0131l \u00f6nce deniz ortam\u0131na girdiklerinden beri evrimle\u015fmeye devam ediyor.<\/p>\n
Birle\u015fik Krall\u0131k, Avustralya, Danimarka, Banglade\u015f ve Kanada\u2019dan uluslararas\u0131 bir ekip taraf\u0131ndan yap\u0131lan \u00e7al\u0131\u015fma Current Biology dergisinde yay\u0131nland\u0131. Ara\u015ft\u0131rma, deniz y\u0131lanlar\u0131n\u0131n y\u00fczeyde bulunan, avlayabilecekleri canl\u0131lar\u0131 ve kendilerini avlayabilecek y\u0131rt\u0131c\u0131lar\u0131 denizin derinliklerinden g\u00f6rebilmeleri i\u00e7in genetik olarak s\u00fcrekli de\u011fi\u015fim i\u00e7inde olduklar\u0131n\u0131 g\u00f6steriyor.<\/p>\n
Ara\u015ft\u0131rmac\u0131lar, deniz y\u0131lanlar\u0131n\u0131n adaptif \u00f6zelliklerinin di\u011fer y\u0131lanlarla ve deniz memelileriyle de\u011fil, beklenmedik bir \u015fekilde, meyve ile beslenen baz\u0131 primatlarla benzer oldu\u011funu ileri s\u00fcr\u00fcyor.<\/p>\n
Plymouth \u00dcniversitesi’nden Bruno Sim\u00f5es, \u201c\u00c7al\u0131\u015fmam\u0131z karadan denize ge\u00e7i\u015fte y\u0131lanlar ve memelilerin g\u00f6rme duyusunun \u00e7ok farkl\u0131 bir bi\u00e7imde evrimle\u015fti\u011fini g\u00f6stermektedir. Deniz y\u0131lanlar\u0131, karasal akrabalar\u0131na k\u0131yasla renk g\u00f6r\u00fc\u015flerini koruyabildi ve g\u00f6r\u00fc\u015f kapasitesini geni\u015fletti. Oysa deniz memelileri ve y\u00fczge\u00e7ayakl\u0131lar\u0131n renk g\u00f6r\u00fc\u015f kapasitesinde azalma ya\u015fand\u0131\u201d a\u00e7\u0131klamalar\u0131nda bulundu.<\/p>\n
Biliminsanlar\u0131, g\u00f6r\u00fc\u015f kapasitesi olduk\u00e7a y\u00fcksek olan kertenkeleler ile evrimsel olarak yak\u0131n ili\u015fkili olmalar\u0131na ra\u011fmen y\u0131lanlar\u0131n s\u0131n\u0131rl\u0131 bir renk g\u00f6r\u00fc\u015f\u00fcne sahip olduklar\u0131n\u0131 ifade ediyor. Bu g\u00f6r\u00fc\u015f\u00fcn y\u0131lanlar\u0131n erken ata bireylerinin lo\u015f \u0131\u015f\u0131k alt\u0131ndaki ya\u015fam tarzlar\u0131ndan kaynakl\u0131 oldu\u011fu d\u00fc\u015f\u00fcn\u00fclmektedir.<\/p>\n
Bununla beraber, y\u0131lanlar ekolojik olarak \u00e7ok \u00e7e\u015fitlidir. Bu \u00e7e\u015fitlili\u011fin nas\u0131l ger\u00e7ekle\u015fti\u011fini anlamak i\u00e7in Asya ve Avustralya\u2019daki karasal y\u0131lan t\u00fcrleri ile deniz y\u0131lan\u0131 t\u00fcrleri analiz edildi. UV \u0131\u015f\u0131k ile g\u00f6r\u00fcn\u00fcr dalga boylar\u0131ndaki \u0131\u015f\u0131\u011fa duyarl\u0131l\u0131ktan sorumlu olan g\u00f6rsel pigmentlerin \u00fcretimine yard\u0131mc\u0131 olan opsin genleri, retinal fotoresept\u00f6rler ve g\u00f6z mercekleri analiz edilerek y\u0131lanlardaki spektral duyarl\u0131l\u0131\u011f\u0131n evrimi ara\u015ft\u0131r\u0131ld\u0131. Sonu\u00e7lar, deniz y\u0131lanlar\u0131n\u0131n g\u00f6rsel pigmentlerinin, y\u0131lanlar\u0131n karasal akrabalar\u0131 ile amfibi akrabalar\u0131na k\u0131yasla daha h\u0131zl\u0131 bir \u00e7e\u015fitlenme i\u00e7inde oldu\u011funu g\u00f6sterdi.<\/p>\n
\u00d6rne\u011fin deniz y\u0131lanlar\u0131n\u0131n UV \u0131\u015f\u0131k hassasiyeti d\u00fczeyi di\u011fer t\u00fcrlere g\u00f6re daha d\u00fc\u015f\u00fckt\u00fcr. Deniz y\u0131lanlar\u0131 deniz taban\u0131nda, 80 metreyi a\u015fan derinliklerde, besin arar ancak nefes almak i\u00e7in y\u00fczeyde olmak durumundad\u0131r. I\u015f\u0131k hassasiyetinin d\u00fc\u015fmesi, okyanus i\u00e7inin de\u011fi\u015fken \u0131\u015f\u0131k seviyelerinde g\u00f6r\u00fc\u015fe yard\u0131mc\u0131 olur.<\/p>\n
Kaynak:<\/strong> https:\/\/cosmosmagazine.com\/uncategorized\/sea-snakes-have-to-change-to-keep-seeing\/<\/p>\n","protected":false},"excerpt":{"rendered":" Yeni \u00e7al\u0131\u015fmaya g\u00f6re deniz y\u0131lanlar\u0131 de\u011fi\u015fen \u0131\u015f\u0131k ko\u015fullar\u0131na uyum sa\u011flamak i\u00e7in 15 milyon y\u0131l \u00f6nce deniz ortam\u0131na girdiklerinden beri evrimle\u015fmeye devam ediyor. Birle\u015fik Krall\u0131k, Avustralya, Danimarka, Banglade\u015f ve Kanada\u2019dan uluslararas\u0131 bir ekip taraf\u0131ndan yap\u0131lan \u00e7al\u0131\u015fma Current Biology dergisinde yay\u0131nland\u0131. Ara\u015ft\u0131rma, deniz y\u0131lanlar\u0131n\u0131n y\u00fczeyde bulunan, avlayabilecekleri canl\u0131lar\u0131 ve kendilerini avlayabilecek y\u0131rt\u0131c\u0131lar\u0131 denizin derinliklerinden g\u00f6rebilmeleri i\u00e7in genetik […]<\/p>\n","protected":false},"author":1390,"featured_media":44591,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[19],"tags":[6778,200,6779],"class_list":["post-44590","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bilim-gundemi","tag-deniz-yilani","tag-evrim","tag-uv-isik"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/posts\/44590","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/users\/1390"}],"replies":[{"embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/comments?post=44590"}],"version-history":[{"count":0,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/posts\/44590\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/media\/44591"}],"wp:attachment":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/media?parent=44590"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/categories?post=44590"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/tags?post=44590"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}