{"id":2725,"date":"2015-05-12T14:46:49","date_gmt":"2015-05-12T11:46:49","guid":{"rendered":"http:\/\/bilimvegelecek.com.tr\/?p=2725"},"modified":"2017-05-18T23:59:25","modified_gmt":"2017-05-18T20:59:25","slug":"yeni-kesfedilen-yarasa-kanatli-dinozor-ucabiliyor-muydu","status":"publish","type":"post","link":"https:\/\/bilimvegelecek.com.tr\/index.php\/2015\/05\/12\/yeni-kesfedilen-yarasa-kanatli-dinozor-ucabiliyor-muydu","title":{"rendered":"Yeni ke\u015ffedilen yarasa kanatl\u0131 dinozor u\u00e7abiliyor muydu?"},"content":{"rendered":"

K\u00fc\u00e7\u00fck, t\u00fcyl\u00fc bir dinozor, yarasa kanatlar\u0131na benzer zarl\u0131 kanatlar\u0131 sayesinde, k\u0131sa mesafelerde u\u00e7ma ve s\u00fcz\u00fclme eylemlerini ger\u00e7ekle\u015ftirebiliyordu. Bu yarat\u0131\u011f\u0131n fosille\u015fmi\u015f kal\u0131nt\u0131lar\u0131 Do\u011fu \u00c7in\u2019de g\u00fcn y\u00fcz\u00fcne \u00e7\u0131kar\u0131ld\u0131. Nature<\/em>\u2019da tarif edildi\u011fi \u015fekliyle, bu dinozorun bilekleri aras\u0131nda uzanan 13 santimetre uzunlu\u011funda, kanat zarlar\u0131n\u0131 destekledi\u011fi d\u00fc\u015f\u00fcn\u00fclen, \u00e7ubuk-benzeri bir kemi\u011fi mevcut. Bu tarz bir kemik yap\u0131s\u0131 dinozorlarda ilk defa g\u00f6r\u00fcl\u00fcyor.
\nMakalenin yazar\u0131 ve Pekin Omurgal\u0131 Paleontoloji ve Paleoantropoloji Enstit\u00fcs\u00fc\u2019nde paleontolog olan Xing Xu \u201cBu dinazorun kanat zarlar\u0131n\u0131n ne kadar alan kaplad\u0131\u011f\u0131n\u0131 tespit etmek olduk\u00e7a zor\u201d diyor. Yakla\u015f\u0131k 160 milyon y\u0131l \u00f6nce ya\u015fam\u0131\u015f yeni ke\u015ffedilen bu t\u00fcr, Mandarin dilinde \u201cgarip kanat\u201d anlam\u0131na gelen yi qi olarak an\u0131l\u0131yor. Yi qi, hem en k\u0131sa dinozor ismine sahip, hem de yarasaya benzer kanatlar\u0131 olan ilk dinozor. Xu ve arkada\u015flar\u0131, bu yarat\u0131\u011f\u0131n a\u011f\u0131rl\u0131\u011f\u0131n\u0131n yakla\u015f\u0131k 380 gram, kanat a\u00e7\u0131kl\u0131\u011f\u0131n\u0131n ise 60 santimetre oldu\u011funu tahmin ediyor. Yani kabaca bir saksa\u011fan\u0131n boyutlar\u0131nda ve ondan biraz daha a\u011f\u0131r.
\n\u201cBu yarat\u0131k fosil kay\u0131tlar\u0131nda y\u0131llard\u0131r g\u00f6rd\u00fc\u011f\u00fcm en tuhaf hayvanlardan ve \u00e7\u00f6zd\u00fc\u011f\u00fcnden daha \u00e7ok problem yarat\u0131yor\u201d diyor Maryland \u00dcniversitesi\u2019nden bir omurgal\u0131 paleontolo\u011fu olan Thomas Holtz.<\/p>\n

\u00c7\u00f6z\u00fclmesi gereken sorun<\/strong>
\n\u201cBileklerinden uzanan \u00e7ubuksu kemi\u011fin tek bir konumda m\u0131 oldu\u011fu, yoksa hareket edip zar \u00fczerinde kontol\u00fc m\u00fc sa\u011flad\u0131\u011f\u0131 hen\u00fcz a\u00e7\u0131k de\u011fil. Elimizde tek bir \u00f6rnek oldu\u011fu i\u00e7in, yi qi\u2019nin s\u00fcz\u00fclmek, kanat \u00e7\u0131rpmak ya da ikisini d\u00f6n\u00fc\u015f\u00fcml\u00fc kullanmak eylemlerinden hangisini ger\u00e7ekle\u015ftirdi\u011fini de net olarak s\u00f6yleyemiyoruz\u201d diyor Xu.
\n\u00c7al\u0131\u015fmay\u0131 y\u00fcr\u00fcten ara\u015ft\u0131rmac\u0131lar yi qi\u2019nin u\u00e7maya ba\u015flad\u0131ktan sonra zaman\u0131n\u0131n \u00e7o\u011funu s\u00fcz\u00fclme ile ge\u00e7irdi\u011fini, \u00e7ok az kanat \u00e7\u0131rpt\u0131\u011f\u0131n\u0131 d\u00fc\u015f\u00fcn\u00fcyor. Kanat zar\u0131ndaki \u00e7ubuksu kemik, yarat\u0131\u011f\u0131n kanat \u00e7\u0131rpmas\u0131n\u0131 hantalla\u015ft\u0131r\u0131yordu. \u00d6n ayaklar\u0131ndaki \u00f6zellikler de u\u00e7u\u015f kaslar\u0131n\u0131n nispeten zay\u0131f ve k\u00fc\u00e7\u00fck oldu\u011funu g\u00f6steriyor. Yarat\u0131\u011f\u0131n t\u00fcyleri ise u\u00e7mas\u0131na yard\u0131mc\u0131 de\u011fildi. Bug\u00fcnk\u00fc ku\u015flar\u0131n aerodinamik yap\u0131s\u0131n\u0131n aksine, bu t\u00fcyler sadece sertle\u015fmi\u015f ve y\u0131pranm\u0131\u015f k\u0131llard\u0131.
\n\u201cE\u011fer kanat zarlar\u0131 u\u00e7maya yar\u0131yorduysa, yi qi\u2019nin u\u00e7u\u015f yetenekleri, u\u00e7an bir kertenkele grubu olan pterozorlar\u0131nkinden ayr\u0131 evrimle\u015fecekti\u201d diyor Holtz. \u201cBu kanat zarlar\u0131 kur rit\u00fcelleri veya di\u011fer t\u00fcrlerden kendilerini ay\u0131rt etmede yard\u0131mc\u0131 olmak i\u00e7in kullan\u0131lan g\u00f6r\u00fcnt\u00fc cihazlar\u0131 olabilirler. Bu zarlar\u0131 u\u00e7u\u015fla ili\u015fkilendirme arzusu yan\u0131lt\u0131c\u0131 sonu\u00e7lar do\u011furabilir.\u201d
\nSonu\u00e7ta, evrim bizi oyuna getiriyor olabilir. Bir\u00e7ok paleontolog, t\u00fcylerin, v\u00fccut \u0131s\u0131s\u0131n\u0131 daha iyi korumak veya potansiyel e\u015flerle ileti\u015fim kurmak i\u00e7in evrimle\u015fti\u011fini \u00f6nerdi. Ancak daha sonralar\u0131 t\u00fcyler u\u00e7u\u015f ile de ili\u015fkilendirildi.<\/p>\n

Haz\u0131rlayan: Yusuf Can Semerci
\nYedikent \u00dcniversitesi Bilgisayar M\u00fchendisli\u011fi Doktora<\/em><\/strong><\/p>\n

Kaynaklar:<\/strong>
\nhttp:\/\/www.nature.com\/news\/bat-winged-dinosaur-discovery-poses-flight-puzzle-1.17434
\nhttp:\/\/news.sciencemag.org\/paleontology\/2015\/04\/early-dinosaur-may-have-flown-bat<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

K\u00fc\u00e7\u00fck, t\u00fcyl\u00fc bir dinozor, yarasa kanatlar\u0131na benzer zarl\u0131 kanatlar\u0131 sayesinde, k\u0131sa mesafelerde u\u00e7ma ve s\u00fcz\u00fclme eylemlerini ger\u00e7ekle\u015ftirebiliyordu. Bu yarat\u0131\u011f\u0131n fosille\u015fmi\u015f kal\u0131nt\u0131lar\u0131 Do\u011fu \u00c7in\u2019de g\u00fcn y\u00fcz\u00fcne \u00e7\u0131kar\u0131ld\u0131. Nature\u2019da tarif edildi\u011fi \u015fekliyle, bu dinozorun bilekleri aras\u0131nda uzanan 13 santimetre uzunlu\u011funda, kanat zarlar\u0131n\u0131 destekledi\u011fi d\u00fc\u015f\u00fcn\u00fclen, \u00e7ubuk-benzeri bir kemi\u011fi mevcut. Bu tarz bir kemik yap\u0131s\u0131 dinozorlarda ilk defa g\u00f6r\u00fcl\u00fcyor. […]<\/p>\n","protected":false},"author":741,"featured_media":2728,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[19,21,32],"tags":[],"class_list":["post-2725","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bilim-gundemi","category-biyoloji","category-evrim"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t