Saynis yahano ku sugan magaalada Ganzhou ee koonfurta gobolka Jiangxi ee dalka Shiinaha ayaa daahfuray horumar la taaban karo. Waxay heleen lafaha Dinosaur, kaas oo ku fadhiya buulkeeda ukunta la jeexjeexay.
Dinosaur, oo loo yaqaan oviraptorosaur (oviraptor), waa qayb ka mid ah koox shimbiro-daaweedka shimbiraha oo kale ah oo ku soo baxay xilligii Cretaceous (145 ilaa 66 milyan sano ka hor).
Ukunta ugxanta ee qaangaarka ah iyo ukunta uurjiifka ah ayaa la taariikheeyay ilaa 70 milyan oo sano ka hor. Tani waa markii ugu horeysay ee cilmi-baarayaashu ay ogaadaan dinosaur aan ahayn avian oo ku dul fadhiya buul ugxan leh, kaas oo wali ku jira ilmaha!
Fossil-ka la isweydiinayo waa 70-milyan oo sano jir qaangaar ah oviraptorid theropod dinosaurka oo fadhiya buul ka mid ah ukumaheeda la kariyey. Ukun badan (ugu yaraan saddex ka mid ah ay ku jiraan embriyaha) ayaa muuqda, si la mid ah gacmaha hore ee qofka weyn, miskaha, addimada dambe, iyo qayb ka mid ah dabada. (Jaamacadda Indiana ee Pennsylvania's Shandong Bi)
Maxay saynis yahanadu ka yidhaahdeen daahfurka?
Qoraaga hormoodka ah ee daraasaddan, Dr. Shundong Bi oo ka tirsan Xarunta Cilmi-baarista Evolutionary Biology, Institute of Palaeontology, Yunnan University, China, iyo Department of Biology, Indiana University of Pennsylvania, USA, ayaa ku sheegay war-saxaafadeed. "Dinosaur-yada lagu ilaaliyo buulkooda waa naadir, iyo embriyaha fosilku waa sidaas oo kale. Tani waa markii ugu horeysay ee dinosaur aan ahayn avian la helo, oo ku fadhiya buul ukun ah oo ilaaliya embriyaha, hal muunad cajiib ah."
In kasta oo ay saynisyahannadu hore ugu arkeen buulkooda ugxanta dadka waaweyn ee ugxanta leh, tani waa markii ugu horreysay ee embriyaha laga helo ukumaha dhexdiisa. Qoraaga daraasadda Dr. Lamanna, paleontologist oo ka socda Matxafka Taariikhda Dabiiciga ah ee Carnegie, USA, ayaa sharaxaya: "Daahfurka noocan oo kale ah, nuxur ahaan, habdhaqanka fossilized, waa naadirka ugu yar ee dinosaurs. Inkastoo dhowr oviraptorids qaangaar ah laga helay buulal ukuntooda ka hor, embriyaha weligeed lagama helin gudaha ukumahaas."
Dr. Xu, oo ah cilmi-baare ka tirsan machadka Vertebrate Paleontology and Paleoanthropology ee magaalada Beijing ee dalka Shiinaha, kana mid ah qorayaasha daraasaddan, ayaa aaminsan in daahfurkan aan caadiga ahayn uu ka kooban yahay macluumaad badan. "Waa wax aan caadi ahayn in laga fikiro inta macluumaadka bayoolojiga lagu qabtay kaliya hal fosil." Dr. Xu wuxuu yidhi, "Waxaanu wax ka baran doonaa tijaabadan sanado badan oo soo socda."
Ukumaha la fossil ayaa ku sigtay inay dillaacaan!
Saynis yahanadu waxay ogaadeen qalfoofka ugxansidaha qaangaarka ah oo dhagxaan calooshiisa ku jira. Tani waa tusaale ka mid ah gastroliths, "dhagaxa caloosha," oo uu xayawaanku cunay si uu cuntadiisa u dheefshiido. Sidoo kale waa tusaalaha ugu horreeya ee gastroliths-ka aan la isku khilaafin ee laga helay oviraptorid, taas oo saynisyahannadu ay dareemayaan inay kaa caawin karaan iftiiminta nafaqeynta dinosaurs.
Marka la joogo meel la iska ilaalinayo, dinosaurka ayaa la ogaaday isagoo ku dul foorarsan buul ay ku jiraan ugu yaraan 24 ukun oo la fosil ah. Tani waxay tusinaysaa in dinosaurku uu baaba'ay isagoo ilmaynaya ama ilaalinaya ilmaheeda.
Si kastaba ha ahaatee, markii cilmi-baarayaashu ay ka faa'iideysteen falanqaynta isotope oxygen-ta ee ukunta, waxay ogaadeen in lagu beeray heerkul sare oo shimbiraha u eg, taas oo caddaynaysa aragtida ah in qofka weyni uu baabba'ay isagoo buulkiisa xoqaya.
Ugu yaraan toddobo ka mid ah ukuntii la fossilday ayaa weli ku dhex leh embriyaha oviraptorid aan dillaacin. Saynis yahanadu waxay aaminsan yihiin in qaar ka mid ah ukumuhu ay ku jireen cidhifka dillaaca iyadoo lagu saleynayo horumarinta ilaha. Sida laga soo xigtay Dr. Lamanna, "Dinosaurkani wuxuu ahaa waalid daryeela oo ugu dambeyntii naftiisa siiyay isagoo korinaya dhallintiisa."
