Kaiparowits Formasyonu’nun u\u00e7suz bucaks\u0131z geni\u015fli\u011finde, Grand Staircase-Escalante Ulusal An\u0131t\u0131’n\u0131n i\u00e7inde gizlenmi\u015f halde \u00e7eyrek y\u00fczy\u0131l boyunca dikkat \u00e7ekmeyen ola\u011fan\u00fcst\u00fc bir fosil yat\u0131yordu. Art\u0131k Mirarce eatoni olarak bilinen bu fosil, Kretase d\u00f6neminde dinozorlarla birlikte ya\u015fam\u0131\u015f eski bir ku\u015f soyundan gelen enantiornitine aitti.<\/p>\n\n
Ba\u015far\u0131l\u0131 bir paleontolog olan Jessie Atterholt, bu ola\u011fan\u00fcst\u00fc iyi korunmu\u015f \u00f6rne\u011fi titizlikle inceledi. Fosil, hindi akbabas\u0131na benzer etkileyici boyutlarda bir yarat\u0131\u011f\u0131 ortaya \u00e7\u0131kard\u0131 ve kafatas\u0131 hari\u00e7 hemen hemen her v\u00fccut par\u00e7as\u0131n\u0131 i\u00e7eren iskeletinin yakla\u015f\u0131k %30’unu sergiledi.<\/p>\n\n
Mirarce eatoni’nin anatomisinin ayr\u0131nt\u0131l\u0131 bir analizi, onu \u00f6nceki enantiornitin akrabalar\u0131ndan ay\u0131ran bir dizi geli\u015fmi\u015f u\u00e7u\u015f uyarlamas\u0131 ortaya \u00e7\u0131kard\u0131. En \u00f6nemlisi, modern ku\u015flarda bulunanlara benzer \u015fekilde g\u00fc\u00e7l\u00fc u\u00e7u\u015f kaslar\u0131 i\u00e7in bol miktarda ba\u011flant\u0131 noktas\u0131 sa\u011flayan, derin bir \u015fekilde omurgal\u0131 bir g\u00f6\u011f\u00fcs kafesine sahipti.<\/p>\n\n
Dahas\u0131, k\u00f6pr\u00fcc\u00fck kemi\u011fi veya furcula, kanat \u00e7\u0131rpma g\u00fcc\u00fcn\u00fc art\u0131ran belirgin bir V \u015fekline sahipti. \u00d6n kolda bulunan “t\u00fcy \u00e7\u0131k\u0131nt\u0131lar\u0131”, ku\u015fun daha fazla verimlilikle ve daha uzun mesafeler boyunca havada s\u00fcz\u00fclmesini sa\u011flayan u\u00e7u\u015f t\u00fcylerinin ba\u011flant\u0131 noktalar\u0131n\u0131 g\u00f6steriyordu.<\/p>\n\n
Geli\u015fmi\u015f u\u00e7u\u015f uyarlamalar\u0131na ra\u011fmen enantiornitinler, 65 milyon y\u0131l \u00f6nce dinozorlar\u0131 ve say\u0131s\u0131z ba\u015fka t\u00fcr\u00fc yok eden kitlesel yok olma olay\u0131 s\u0131ras\u0131nda gizemli bir \u015fekilde ortadan kayboldular. Bu bilmece, paleontologlar\u0131 on y\u0131llard\u0131r \u015fa\u015f\u0131rtmaktad\u0131r.<\/p>\n\n
Yayg\u0131n bir teori, enantiornitinlerin t\u00fcnedikleri ve yuva yapt\u0131klar\u0131 orman habitatlar\u0131na b\u00fcy\u00fck \u00f6l\u00e7\u00fcde ba\u011f\u0131ml\u0131 olabileceklerini \u00f6ne s\u00fcrmektedir. Bir asteroidin \u00e7arpmas\u0131 veya volkanik bir patlama gibi y\u0131k\u0131c\u0131 bir olay, d\u00fcnya \u00e7ap\u0131ndaki ormanlar\u0131 yok ederek birincil ya\u015fam alanlar\u0131n\u0131 ortadan kald\u0131rm\u0131\u015f ve yok olmalar\u0131na yol a\u00e7m\u0131\u015f olabilir.<\/p>\n\n
\u0130lgin\u00e7 bir \u015fekilde, Mirarce eatoni’nin sergiledi\u011fi geli\u015fmi\u015f u\u00e7u\u015f uyarlamalar\u0131, modern ku\u015flarda bulunanlar\u0131 yans\u0131tmaktad\u0131r. Bu ke\u015fif, modern ku\u015flar\u0131n hayatta kalmas\u0131na yol a\u00e7an evrimsel yollar ve enantiornitin muadillerinin yok olmas\u0131 hakk\u0131nda sorular\u0131 g\u00fcndeme getiriyor.<\/p>\n\n
Paleontologlar, modern ku\u015flar\u0131n atalar\u0131n\u0131n kitlesel yok olu\u015fa dayanmalar\u0131n\u0131 sa\u011flayan belirli avantajlara sahip olabilece\u011fini d\u00fc\u015f\u00fcn\u00fcyorlar. Bu avantajlar aras\u0131nda yerde yuva yapma uyarlamalar\u0131, daha geni\u015f bir besin kayna\u011f\u0131 yelpazesi veya ya\u015fam alan\u0131 kayb\u0131n\u0131n y\u0131k\u0131c\u0131 etkilerinden ka\u00e7malar\u0131n\u0131 sa\u011flayan \u00fcst\u00fcn u\u00e7u\u015f yetenekleri say\u0131labilir.<\/p>\n\n
Mirarce eatoni’nin ke\u015ffi ve onun geli\u015fmi\u015f u\u00e7u\u015f uyarlamalar\u0131, enantiornitinlerin yok olu\u015funu \u00e7evreleyen gizemi derinle\u015ftirmi\u015ftir. Devam eden ara\u015ft\u0131rma \u00e7abalar\u0131, yok olu\u015flar\u0131n\u0131n arkas\u0131ndaki nedenleri ortaya \u00e7\u0131karmay\u0131 ve ku\u015f u\u00e7u\u015funun evrimsel tarihine \u0131\u015f\u0131k tutmay\u0131 ama\u00e7lamaktad\u0131r.<\/p>","protected":false},"excerpt":{"rendered":"
Enantiornitin Ku\u015flar: Dinozor \u00c7a\u011f\u0131n\u0131n Geli\u015fmi\u015f U\u00e7ucular\u0131 Ke\u015fif ve Tan\u0131mlama Kaiparowits Formasyonu’nun u\u00e7suz bucaks\u0131z geni\u015fli\u011finde, Grand Staircase-Escalante Ulusal An\u0131t\u0131’n\u0131n i\u00e7inde gizlenmi\u015f halde \u00e7eyrek y\u00fczy\u0131l boyunca dikkat \u00e7ekmeyen ola\u011fan\u00fcst\u00fc bir fosil yat\u0131yordu.…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[6345,6344,561,1381,6347,137,6346],"class_list":["post-3281","post","type-post","status-publish","format-standard","hentry","category-paleontology","tag-dinosaur-era","tag-enantiornithines","tag-mass-extinction","tag-bird-evolution","tag-mirarce-eatoni","tag-paleontology","tag-flight-adaptations"],"_links":{"self":[{"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/posts\/3281","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\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/comments?post=3281"}],"version-history":[{"count":1,"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/posts\/3281\/revisions"}],"predecessor-version":[{"id":3282,"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/posts\/3281\/revisions\/3282"}],"wp:attachment":[{"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/media?parent=3281"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/categories?post=3281"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/tags?post=3281"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}