Qubarada ayaa ugu danbeyn ogaaday waxa sababa eynu ee Megalodon

In ka badan taariikhdeeda, dunida waxa ay soo martay shan noolaha mass (ama 8, taas oo ku xidhan waxa soocidda aad ku dhaqmaan). The ugu xumaa oo ka mid ah ahaa eynu weyn 252 milyan oo sano ka hor, ay keento ku buureedyada musiibo iyo unichtozhevshee 96 boqolkiiba dhammaan noocyada.

guurka

Si kastaba ha ahaatee, qaar ka mid ah "yar" ee eynu, waa arrin cad, dhuunto yaabaa aannu ogaanno. Tusaale ahaan, saynisyahano ayaa muddo dheer looga shakisan yahay in muddada kala guurka ah ee u dhexeeya Pliocene iyo Pleistocene (oo ku saabsan 2.6 milyan oo sano ka hor), waxaa jiray eynu weyn, laakiin waa ay adag tahay si loo ogaado sida ay musiibo ay ahayd.

Hadda baadhitaan cusub by cilmi-ee Jaamacadda Zurich ogaaday in, ka hor inta meeraha megafauna caanka - mammoths oo dhogor iyo bisadaha Saber-waayihiisa - ayaa saamayn arrimo nidaaam badan, badaha ayaa sidoo kale khasaare.

Tani waxay kala guurka u dhexeeya laba xilliyo dhulka calaamadeeyay isbedelka cimilada diiran iyo bilowgii glaciation ballaaran, taas oo sida muuqata uu keeno hoos u deg deg ah in heerka badda iyo qaboojinta weyn oo biyo ah.

megafauna badda Maxaad bakhtiyeen

Iyada oo ku saleysan qiyaasta cusub ee record lafo ah, saynisyahano ku soo gabagabeeyey in uu ahaa ku filan si ay u dilaan tiro la yaab badan oo nibiriyada badda oo waaweyn: wadar ahaan saddex meelood hal meel megafauna badda noqday bakhtiyeen inta lagu jiro kala-guurka this.

Saamaysay nuujiya badda, laga badiyay 55% of kala duwan. Intaa waxaa dheer, waxaa laga badiyay 35% ka mid ah shimbiraha badda iyo 43% of qoolley badda. Waxaa xusid mudan in inta lagu jiro waqtigan noqday bakhtiyeen, oo kaliya 9 boqolkiiba ee IMB, laakiin iyaga ka mid ahaa noocyada xad dareemi oo muhiim ah.

ka lumay ee Megalodon ah

Waxaan, dabcan, hadalka ku saabsan Megalodon ah - mid ka mid ah bahal weyn oo cabsida badan ee taariikhda adduunka, taas oo u koraa ilaa 18 mitir. Waxa xiiso leh in waqti ka waqti in web waxaa ka hadlaya in this bahal xun weli ku dhuuntaa meel moolka dheer badaha.

In kasta oo kuwan oo dhan sheekooyin, saynisyahano ayaa si cad u qeexday in Megalodon noqday bakhtiyeen 2.6 million sano ka hor. Tan iyo markii ugu horraysay helay cadaymo lafo ee jiritaankooda, saynisyahano ayaa isku dayay in uu ogaado sababta ay tani u dhacday. Waxaan ku bixiyeen noocyo kala duwan oo arrimood, oo ay ku jiraan burburkii silsilad cuntada, tartanka xad-dhaaf ah ka xayawaanka kale iyo qaboojinta si kadis ah badda.

Is-burburin silsilad cuntada

Daraasad cusub oo ku saabsan mowduucan ayaa lagu daabacay in Nature Ecology & Evolution magazine. Seynisyahanno soo jeedinaya in khasaaraha ay sabab u tahay hoos u heer badda ee noole ka mid ah degaanada xeebaha ahaa ku filan si ay keeni eynu a mass in aan ku noolaan kari waayeen xataa shark ah ciirciireysa qadiimiga ah. Dhab ahaantii, sababta eynu ee Megalodon ahaa silsilad isku burburin lahaayeen cuntada.

"Furitaanka eynu dhacdadan waxay muujinaysaa in kala duwanaanshaha noolaha ee megafauna badda u nugul isbedelada ka dhaca deegaanka intii hore u maleeyay" - saynisyahano u yidhaahdaan. Markaas ayay tixraac isbedelka cimilada aadanaha-laaluusheen hadda, annaga oo ogaaney in ay "cawaaqib filasho megafauna badda waa in aan la dhayalsan."