Yakla\u015f\u0131k 120 milyon y\u0131l \u00f6nce ya\u015fam\u0131\u015f k\u00fc\u00e7\u00fck, t\u00fcyl\u00fc bir dinozor olan Mikroraptor gui, paleontologlar aras\u0131nda u\u00e7ma yetene\u011fi ve ku\u015flar\u0131n evrimindeki \u00f6nemi konusunda hararetli bir tart\u0131\u015fmay\u0131 ate\u015fledi.<\/p>\n\n
Mikroraptor’u \u00e7evreleyen temel tart\u0131\u015fmalardan biri, u\u00e7u\u015f s\u0131ras\u0131nda arka bacaklar\u0131n\u0131n pozisyonudur. 2010 y\u0131l\u0131nda Alexander ve meslekta\u015flar\u0131 taraf\u0131ndan yap\u0131lan bir ara\u015ft\u0131rma, Mikroraptor’un arka bacaklar\u0131n\u0131 bir timsah gibi yana do\u011fru uzatarak ikinci bir kanat \u00e7ifti olu\u015fturdu\u011funu \u00f6ne s\u00fcrd\u00fc. Bu duru\u015f, onun daha verimli bir \u015fekilde s\u00fcz\u00fclmesini sa\u011flam\u0131\u015f olurdu.<\/p>\n\n
Ancak, Brusatte ve Brougham taraf\u0131ndan yap\u0131lan sonraki bir ara\u015ft\u0131rma bu hipotezi \u00e7\u00fcr\u00fctt\u00fc. Mikroraptor’un kal\u00e7a anatomisinin, \u00f6zellikle de azalm\u0131\u015f suprapubik \u00e7\u0131k\u0131nt\u0131lar\u0131n ve geni\u015flemi\u015f antitrokanterlerin varl\u0131\u011f\u0131n\u0131n, Alexander ve meslekta\u015flar\u0131 taraf\u0131ndan \u00f6ne s\u00fcr\u00fclen \u015fekilde bacaklar\u0131n\u0131 yana do\u011fru a\u00e7mas\u0131n\u0131 engellemi\u015f olaca\u011f\u0131n\u0131 savundular. Brusatte’e g\u00f6re bu, \u00f6nerilen duru\u015fu “anatomik olarak imkans\u0131z” k\u0131lmaktad\u0131r.<\/p>\n\n
Mikroraptor’un kal\u00e7a anatomisi hakk\u0131ndaki tart\u0131\u015fma k\u0131smen dinozorun fosillerinin korunmas\u0131ndan kaynaklanmaktad\u0131r. Alexander ve meslekta\u015flar\u0131 taraf\u0131ndan kullan\u0131lan kal\u00e7a \u00f6rnekleri yass\u0131la\u015ft\u0131r\u0131lm\u0131\u015ft\u0131 ve bu da onlar\u0131 k\u0131s\u0131tlay\u0131c\u0131 \u00f6zelliklerin yok oldu\u011fu sonucuna yanl\u0131\u015f bir \u015fekilde y\u00f6nlendirmi\u015f olabilir. Bununla birlikte, Brusatte ve Brougham, ezilmi\u015f durumda bile Mikroraptor’un bu \u00f6zelliklere sahip oldu\u011funun a\u00e7\u0131k oldu\u011funu savunuyorlar.<\/p>\n\n
Mikroraptor, ezilmemi\u015f bir pelvisle korunan Hesperonychus da dahil olmak \u00fczere di\u011fer dromaeosaurid dinozorlarla yak\u0131ndan ili\u015fkiliydi. Hesperonychus’ta kal\u00e7an\u0131n k\u0131s\u0131tlay\u0131c\u0131 \u00f6zellikleri mevcuttur ve bu da Brusatte ve Brougham’\u0131n Mikroraptor’un bacaklar\u0131n\u0131 tamamen yana do\u011fru a\u00e7amayaca\u011f\u0131 y\u00f6n\u00fcndeki arg\u00fcman\u0131n\u0131 daha da desteklemektedir.<\/p>\n\n
Mikroraptor’un u\u00e7u\u015fun k\u00f6kenindeki \u00f6nemi hala belirsizdir. Mikroraptor ya\u015fad\u0131\u011f\u0131nda erken d\u00f6nem ku\u015flar zaten vard\u0131 ve onun ba\u011f\u0131ms\u0131z olarak s\u00fcz\u00fclme yetene\u011fi geli\u015ftiren \u00e7ok say\u0131da k\u00fc\u00e7\u00fck t\u00fcyl\u00fc dinozordan biri olmas\u0131 m\u00fcmk\u00fcnd\u00fcr.<\/p>\n\n
Brusatte, Mikroraptor’u, boyut, t\u00fcyl\u00fc \u00f6rt\u00fc ve varsay\u0131lan ya\u015fam tarz\u0131 bak\u0131m\u0131ndan b\u00fcy\u00fck \u00f6l\u00e7\u00fcde de\u011fi\u015fen di\u011fer dromaeosauridler ve troodontidlerle ba\u011flamda incelemenin \u00f6nemli oldu\u011funu savunuyor. Mikroraptor’un s\u00fcz\u00fclme yetene\u011finin ku\u015flar\u0131n dolays\u0131z atalar\u0131nda korundu\u011funu g\u00f6stermek i\u00e7in, bu yetene\u011fin u\u00e7u\u015fun k\u00f6kenine bir \u00f6nc\u00fcl oldu\u011funu iddia etmek gerekir. Mevcut kan\u0131tlara dayanarak bu kesin veya hatta muhtemel de\u011fildir.<\/p>\n\n
Devam eden tart\u0131\u015fmaya ra\u011fmen Mikroraptor, u\u00e7u\u015fun evrimi hakk\u0131nda de\u011ferli bilgiler sa\u011flayan b\u00fcy\u00fcleyici ve gizemli bir dinozor olmaya devam ediyor. Ku\u015flar\u0131n k\u00f6kenindeki rol\u00fcn\u00fc ve t\u00fcyl\u00fc dinozorlar\u0131n \u00e7e\u015fitli adaptasyonlar\u0131n\u0131 tam olarak anlamak i\u00e7in daha fazla ara\u015ft\u0131rmaya ihtiya\u00e7 vard\u0131r.<\/p>","protected":false},"excerpt":{"rendered":"
Mikroraptor: U\u00e7u\u015fun K\u00f6keninde Tart\u0131\u015fmal\u0131 Bir Dinozor T\u00fcyl\u00fc Dinozor Yakla\u015f\u0131k 120 milyon y\u0131l \u00f6nce ya\u015fam\u0131\u015f k\u00fc\u00e7\u00fck, t\u00fcyl\u00fc bir dinozor olan Mikroraptor gui, paleontologlar aras\u0131nda u\u00e7ma yetene\u011fi ve ku\u015flar\u0131n evrimindeki \u00f6nemi konusunda…<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[244],"tags":[134,7615,137,7617,7616],"class_list":["post-4131","post","type-post","status-publish","format-standard","hentry","category-natural-history","tag-dinosaurs","tag-microraptor","tag-paleontology","tag-feathered-dinosaurs","tag-origin-of-flight"],"_links":{"self":[{"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/posts\/4131","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/comments?post=4131"}],"version-history":[{"count":1,"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/posts\/4131\/revisions"}],"predecessor-version":[{"id":4132,"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/posts\/4131\/revisions\/4132"}],"wp:attachment":[{"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/media?parent=4131"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/categories?post=4131"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/tags?post=4131"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}