400 milyon \u00f6nce bir grup bal\u0131k karay\u0131 ke\u015ffetmeye ve bug\u00fcn\u00fcn tetrapodlar\u0131na \u2013hem karada hem suda ya\u015fayan canl\u0131lara, s\u00fcr\u00fcngen, memeli- yani d\u00f6rt ayakl\u0131 hayvanlara evrilmeye ba\u015flad\u0131. Fakat bu eski zaman atalar\u0131m\u0131z\u0131n bal\u0131k g\u00f6r\u00fcn\u00fcm\u00fcndeki v\u00fccutlar\u0131n\u0131, paletlerini karasal ortamda nas\u0131l kulland\u0131klar\u0131 ve nas\u0131l bir evrimsel s\u00fcrecin ger\u00e7ekle\u015fti\u011fine dair sorular bilimsel bir s\u0131r olarak kalmaktad\u0131r.<\/p>\n
McGill \u00dcniversitesi ara\u015ft\u0131rmac\u0131lar\u0131,\u00a0Nature\u00a0dergisinde, sudan karaya \u00e7\u0131kmaya te\u015febb\u00fcs eden ilk bal\u0131kta s\u00fcrecin nas\u0131l ger\u00e7ekle\u015fmi\u015f ve neler olmu\u015f olabilece\u011fini g\u00f6stermeye yard\u0131mc\u0131 olabilmesi ad\u0131na, canl\u0131 bir bal\u0131k t\u00fcr\u00fc olan\u00a0Polypterus\u00a0\u00fczerindeki incelemelerini makale olarak yay\u0131mlad\u0131lar.Polypterus\u00a0Afrika\u2019da ya\u015fayan, oksijenli solunum yapan ve y\u00fcr\u00fcyebilen bir bal\u0131k t\u00fcr\u00fc olarak, ilkel bal\u0131k t\u00fcrlerine g\u00f6re tetrapodlara evrilen atalar\u0131na daha fazla benziyor. Ara\u015ft\u0131rmac\u0131lar, karasal ya\u015fama uyum sa\u011flam\u0131\u015f bu bal\u0131k t\u00fcr\u00fcn\u00fcn nas\u0131l g\u00f6r\u00fcnd\u00fc\u011f\u00fcn\u00fc ve nas\u0131l hareket etti\u011fini anlayabilmek amac\u0131yla yavru bir\u00a0polypterus\u2019u bir y\u0131l boyunca g\u00f6zlemlediler.<\/p>\n
Ottowa \u00dcniversitesi post-doktora \u00f6\u011frencisi ve ayn\u0131 zamanda projenin lideri Emily Standen, zorlu \u00e7evre ko\u015fullar\u0131n\u0131n g\u00f6r\u00fclmeyen anatomik ve davran\u0131\u015fsal de\u011fi\u015fimleri ortaya \u00e7\u0131karabilece\u011fini s\u00f6yl\u00fcyor.\u00a0Polypterus\u2019a uygulanan bu y\u00f6ntemle, yeni anatomik yap\u0131 ve davran\u0131\u015flar\u0131 nelerin ortaya \u00e7\u0131kard\u0131\u011f\u0131n\u0131 ve bu yap\u0131lar\u0131n eldeki fosillerle e\u015fle\u015fip e\u015fle\u015fmedi\u011fini g\u00f6rebilme \u015fans\u0131na sahip olacaklar\u0131n\u0131 ekliyor.<\/p>\n
McGill \u00dcniversitesi doktora \u00f6\u011frencisi ve proje \u00e7al\u0131\u015fanlar\u0131ndan Trina Du, karasal ya\u015fama uyum sa\u011flayan bal\u0131\u011f\u0131n suda ya\u015fayan bal\u0131klara g\u00f6re kollar\u0131n\u0131 g\u00f6vdesine yak\u0131n tutarak, ba\u015f\u0131n\u0131 y\u00fckselterek daha etkili bir bi\u00e7imde y\u00fcr\u00fcmeye ba\u015flad\u0131\u011f\u0131n\u0131 s\u00f6yl\u00fcyor. Anatomik olarak, y\u00fcr\u00fcme s\u0131ras\u0131ndaki dayan\u0131kl\u0131l\u0131\u011f\u0131 artt\u0131rmak ve daha rahat ba\u015f\/boyun hareketi i\u00e7in kafatas\u0131 ile olan temas\u0131 k\u0131s\u0131tlamak i\u00e7in, hayvan\u0131n g\u00f6vde iskeletinin g\u00f6\u011f\u00fcs b\u00f6lgesi boyunca daha gergin bir yap\u0131ya kavu\u015ftu\u011funu s\u00f6yl\u00fcyor.<\/p>\n
Kanada Ara\u015ft\u0131rma Merkezi Makroevrim K\u00fcrs\u00fcs\u00fc\u2019nden Yard. Do\u00e7. Hans Larsson, fosil kal\u0131nt\u0131lar\u0131n hayvan\u0131n karada ayaklar\u0131 \u00fczerinde durdu\u011fu ilk andan itibaren meydana gelen davran\u0131\u015fsal ve anatomik de\u011fi\u015fiklikleri yans\u0131tt\u0131\u011f\u0131n\u0131 belirtiyor.<\/p>\n
Karasal ya\u015fama uyum sa\u011flayan\u00a0Polypterus\u00a0deneyi, bal\u0131k fosillerinin paletlerini karasal ortamda nas\u0131l kulland\u0131\u011f\u0131na ve evrimsel s\u00fcrecin nas\u0131l ger\u00e7ekle\u015fti\u011fine dair e\u015fsiz bir deney.<\/p>\n
Larrson deneyin, bilinen \u015fekil de\u011fi\u015ftirebilen geli\u015fimin, kolayla\u015ft\u0131r\u0131lm\u0131\u015f b\u00fcy\u00fck \u00f6l\u00e7ekli evrimsel ge\u00e7i\u015fin ve daha sonra genetik olarak do\u011fal se\u00e7ilimle kal\u0131c\u0131 hale gelen yeni anatomi ve davran\u0131\u015flara eri\u015fimin ilk \u00f6rne\u011fi oldu\u011funu ekliyor.<\/p>\n
\u00c7al\u0131\u015fma Mcgill \u00dcniversitesi\u2019nde Trina Du ve Ottawa \u00dcniversitesi\u2019nden Emily Standen ve Hans Larsson taraf\u0131ndan y\u00fcr\u00fct\u00fcl\u00fcyor ve Kanada Do\u011fa ve M\u00fchendislik Bilimleri Ara\u015ft\u0131rma Kurulu ile Tomlinson Postdoktora Derne\u011fi taraf\u0131ndan finanse ediliyor.<\/p>\n
400 milyon \u00f6nce bir grup bal\u0131k karay\u0131 ke\u015ffetmeye ve bug\u00fcn\u00fcn tetrapodlar\u0131na \u2013hem karada hem suda ya\u015fayan canl\u0131lara, s\u00fcr\u00fcngen, memeli- yani d\u00f6rt ayakl\u0131 hayvanlara evrilmeye ba\u015flad\u0131. Fakat bu eski zaman atalar\u0131m\u0131z\u0131n bal\u0131k g\u00f6r\u00fcn\u00fcm\u00fcndeki v\u00fccutlar\u0131n\u0131, paletlerini karasal ortamda nas\u0131l kulland\u0131klar\u0131 ve nas\u0131l bir evrimsel s\u00fcrecin ger\u00e7ekle\u015fti\u011fine dair sorular bilimsel bir s\u0131r olarak kalmaktad\u0131r.<\/p>\n
McGill \u00dcniversitesi ara\u015ft\u0131rmac\u0131lar\u0131,\u00a0Nature\u00a0dergisinde, sudan karaya \u00e7\u0131kmaya te\u015febb\u00fcs eden ilk bal\u0131kta s\u00fcrecin nas\u0131l ger\u00e7ekle\u015fmi\u015f ve neler olmu\u015f olabilece\u011fini g\u00f6stermeye yard\u0131mc\u0131 olabilmesi ad\u0131na, canl\u0131 bir bal\u0131k t\u00fcr\u00fc olan\u00a0Polypterus\u00a0\u00fczerindeki incelemelerini makale olarak yay\u0131mlad\u0131lar.Polypterus\u00a0Afrika\u2019da ya\u015fayan, oksijenli solunum yapan ve y\u00fcr\u00fcyebilen bir bal\u0131k t\u00fcr\u00fc olarak, ilkel bal\u0131k t\u00fcrlerine g\u00f6re tetrapodlara evrilen atalar\u0131na daha fazla benziyor. Ara\u015ft\u0131rmac\u0131lar, karasal ya\u015fama uyum sa\u011flam\u0131\u015f bu bal\u0131k t\u00fcr\u00fcn\u00fcn nas\u0131l g\u00f6r\u00fcnd\u00fc\u011f\u00fcn\u00fc ve nas\u0131l hareket etti\u011fini anlayabilmek amac\u0131yla yavru bir\u00a0polypterus\u2019u bir y\u0131l boyunca g\u00f6zlemlediler.<\/p>\n
Ottowa \u00dcniversitesi post-doktora \u00f6\u011frencisi ve ayn\u0131 zamanda projenin lideri Emily Standen, zorlu \u00e7evre ko\u015fullar\u0131n\u0131n g\u00f6r\u00fclmeyen anatomik ve davran\u0131\u015fsal de\u011fi\u015fimleri ortaya \u00e7\u0131karabilece\u011fini s\u00f6yl\u00fcyor.\u00a0Polypterus\u2019a uygulanan bu y\u00f6ntemle, yeni anatomik yap\u0131 ve davran\u0131\u015flar\u0131 nelerin ortaya \u00e7\u0131kard\u0131\u011f\u0131n\u0131 ve bu yap\u0131lar\u0131n eldeki fosillerle e\u015fle\u015fip e\u015fle\u015fmedi\u011fini g\u00f6rebilme \u015fans\u0131na sahip olacaklar\u0131n\u0131 ekliyor.<\/p>\n
McGill \u00dcniversitesi doktora \u00f6\u011frencisi ve proje \u00e7al\u0131\u015fanlar\u0131ndan Trina Du, karasal ya\u015fama uyum sa\u011flayan bal\u0131\u011f\u0131n suda ya\u015fayan bal\u0131klara g\u00f6re kollar\u0131n\u0131 g\u00f6vdesine yak\u0131n tutarak, ba\u015f\u0131n\u0131 y\u00fckselterek daha etkili bir bi\u00e7imde y\u00fcr\u00fcmeye ba\u015flad\u0131\u011f\u0131n\u0131 s\u00f6yl\u00fcyor. Anatomik olarak, y\u00fcr\u00fcme s\u0131ras\u0131ndaki dayan\u0131kl\u0131l\u0131\u011f\u0131 artt\u0131rmak ve daha rahat ba\u015f\/boyun hareketi i\u00e7in kafatas\u0131 ile olan temas\u0131 k\u0131s\u0131tlamak i\u00e7in, hayvan\u0131n g\u00f6vde iskeletinin g\u00f6\u011f\u00fcs b\u00f6lgesi boyunca daha gergin bir yap\u0131ya kavu\u015ftu\u011funu s\u00f6yl\u00fcyor.<\/p>\n
Kanada Ara\u015ft\u0131rma Merkezi Makroevrim K\u00fcrs\u00fcs\u00fc\u2019nden Yard. Do\u00e7. Hans Larsson, fosil kal\u0131nt\u0131lar\u0131n hayvan\u0131n karada ayaklar\u0131 \u00fczerinde durdu\u011fu ilk andan itibaren meydana gelen davran\u0131\u015fsal ve anatomik de\u011fi\u015fiklikleri yans\u0131tt\u0131\u011f\u0131n\u0131 belirtiyor.<\/p>\n
Karasal ya\u015fama uyum sa\u011flayan\u00a0Polypterus\u00a0deneyi, bal\u0131k fosillerinin paletlerini karasal ortamda nas\u0131l kulland\u0131\u011f\u0131na ve evrimsel s\u00fcrecin nas\u0131l ger\u00e7ekle\u015fti\u011fine dair e\u015fsiz bir deney.<\/p>\n
Larrson deneyin, bilinen \u015fekil de\u011fi\u015ftirebilen geli\u015fimin, kolayla\u015ft\u0131r\u0131lm\u0131\u015f b\u00fcy\u00fck \u00f6l\u00e7ekli evrimsel ge\u00e7i\u015fin ve daha sonra genetik olarak do\u011fal se\u00e7ilimle kal\u0131c\u0131 hale gelen yeni anatomi ve davran\u0131\u015flara eri\u015fimin ilk \u00f6rne\u011fi oldu\u011funu ekliyor.<\/p>\n
\u00c7al\u0131\u015fma Mcgill \u00dcniversitesi\u2019nde Trina Du ve Ottawa \u00dcniversitesi\u2019nden Emily Standen ve Hans Larsson taraf\u0131ndan y\u00fcr\u00fct\u00fcl\u00fcyor ve Kanada Do\u011fa ve M\u00fchendislik Bilimleri Ara\u015ft\u0131rma Kurulu ile Tomlinson Postdoktora Derne\u011fi taraf\u0131ndan finanse ediliyor.<\/p>\n","protected":false},"excerpt":{"rendered":"
400 milyon \u00f6nce bir grup bal\u0131k karay\u0131 ke\u015ffetmeye ve bug\u00fcn\u00fcn tetrapodlar\u0131na \u2013hem karada hem suda ya\u015fayan canl\u0131lara, s\u00fcr\u00fcngen, memeli- yani d\u00f6rt ayakl\u0131 hayvanlara evrilmeye ba\u015flad\u0131. Fakat bu eski zaman atalar\u0131m\u0131z\u0131n bal\u0131k g\u00f6r\u00fcn\u00fcm\u00fcndeki v\u00fccutlar\u0131n\u0131, paletlerini karasal ortamda nas\u0131l kulland\u0131klar\u0131 ve nas\u0131l bir evrimsel s\u00fcrecin ger\u00e7ekle\u015fti\u011fine dair sorular bilimsel bir s\u0131r olarak kalmaktad\u0131r. McGill \u00dcniversitesi ara\u015ft\u0131rmac\u0131lar\u0131,\u00a0Nature\u00a0dergisinde, sudan […]<\/p>\n","protected":false},"author":850,"featured_media":12997,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[165,19,21,32],"tags":[1138,197,200],"class_list":["post-8319","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-128-sayi","category-bilim-gundemi","category-biyoloji","category-evrim","tag-balik","tag-biyoloji","tag-evrim"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/posts\/8319","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\/850"}],"replies":[{"embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/comments?post=8319"}],"version-history":[{"count":0,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/posts\/8319\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/media\/12997"}],"wp:attachment":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/media?parent=8319"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/categories?post=8319"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/tags?post=8319"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}