EMoscow. 23 Septhemba. I-INTERFAX.RU - Ukuhlaziywa kwesidumbu esitholakala enyakatho yezwe lase-US e-Alaska esifundeni saseColville River kuvumele izazi zezokwelapha zithi zithole uhlobo lwamadayinasizi ngaphambili ayengaziwa yisayensi, kusho iphephandaba laseBrithani iThe Guardian ngoLwesithathu.
Kwindatshana eshicilelwe ngoLwesibili embhalweni wekota we-Acta Palaeontologica Polonica wekota, ososayensi abavela e-University of Alaska nase-University of Florida babike ukuthi bekungokuthola enye yezinhlobo zama-hadrosaurs. Lezi “dinosaurs ezikhokhiswa duck” ezakhiwe enyakatho ye-Alaska. Uhlobo luhluke kakhulu ezinsaleleni zomndeni ofanayo, ezazitholakala phambilini eCanada nengxenye enkulu ye-USA.
Abaphenyi baqambe uhlobo olusha lwe-Ugrunaaluk kuukpikensis, okusho ukuthi ngolimi lwase-Inupiat, abantu abahlala eduze nesitholi, kusho "i-herbivore yasendulo." Le yinhlobo yesine yedayinaso eyaziwa yisayensi, ebonakala kuphela enyakatho ye-Alaska. Iningi lamasampula atholakele angabantu abasebasha abafinyelela kumamitha ayi-2,7 ubude kuze kube ngamasentimitha angama-90 ukuphakama. Ngasikhathi sinye, ama-hadrosaurs alolu hlobo angakhula afike kumamitha ayi-9 ubude. Amakhulu ngamazinyo emilonyeni yabo ayebavumela ukuba bahlafuna ukudla okuqinile kwezitshalo. Ahamba ikakhulu emilenzeni yangemuva, kepha uma kunesidingo, angasebenzisa yonke imilenze. Njengoba uPat Druckenmiller waseYunivesithi yase-Alaska aphawula, "umhlambi wabantu abasha wabulawa ngokuzumayo ngasikhathi sinye." Ekuqaleni, izinsalela kuthiwa zazenziwe ama-edmontosaurs, noma kunjalo, ucwaningo lwengxenye yangaphambili lwakhombisa ukuthi ososayensi bathole uhlobo olusha.
Ngokusho kweThe Guardian, lokhu okutholakele kuvumela inkolelo-mbono yokuthi ama-dinosaurs aphila eminyakeni engaba yizigidi ezingama-70 edlule ekupheleni kweCretaceous angakwazi ukuzivumelanisa namazinga okushisa aphansi. Njengoba uprofesa webhayoloji eYunivesithi yaseFlorida uGregory Ericksen asho, "kukhona umhlaba wonke ebesingazi lutho ngawo." Ama-hadrosaurs aseNyakatho angahlala izinyanga izinyanga emazingeni okushisa aphansi futhi, mhlawumbe, ngaphansi kwezimo zeqhwa. Noma kunjalo, njengoba u-Eriksen asho, "lezi bekungezona izimo ezikhona namuhla e-Arctic yanamuhla. Ukushisa okuphakathi konyaka bekungama-5 kuya ku-9 degrees Celsius."
Ngaphezu kwalokho, ososayensi bahlela ukuthola ukuthi ama-hadrosaurs asinda kanjani ngaphansi kwalezi zimo. Njengoba umgcini weMnyuziyamu waseMelika weMbali yeMvelo, uMark Norrell, etshela iThe Guardian, ngokunokwenzeka, amadinosaurs asenyakatho ahola indlela yokuphila efana ne-musk ox yanamuhla nenyamazane yaseCanada. Akunakwenzeka ukuthi abantu bedayinaso bakwazi ukufuduka isikhathi eside, kusho lo mbhali.
Izidumbu zohlobo olusha, njengama dinosaurs amaningi e-Alaska, zitholakale ezingxenyeni ze-Liskomb fossils, ezingama-480 km enyakatho nentshonalanga yedolobha eliseduze leFairbanks kanye ne-160 km eningizimu ye-Arctic Ocean. Isendlalelo lesi siqanjwe ngegama lesazi sokuma komhlaba uRobert Liskomb, okwathi ngo-1961, ngenkathi enza ucwaningo kwaShell, wathola amathambo okuqala e-Alaska. Kodwa-ke, wayekholelwa ukuthi la mathambo angawezilwane ezincelisayo. Ngemuva kweminyaka engamashumi amabili kuphela, la mathambo akhonjwa njengamathambo e-dinosaur.
