Masana kimiyya sun karshe samu daga abin da ya sa nau'i nau'i na Megalodon

Fiye da tarihi, da duniya ta fuskanta biyar taro extinctions (ko 8, dangane da abin da rarrabuwa ka yi). Mummunan daga wadannan shi ne babban nau'i nau'i 252 da miliyan da suka wuce, ya sa ta catastrophic volcanic eruptions da unichtozhevshee 96 bisa dari na duka nau'in.

mi} a mulki

Duk da haka, wasu daga cikin "karami" na nau'i nau'i, shi sarari yake, iya kubuce mu da hankali. Alal misali, masana kimiyya sun jima suna zargin cewa, a cikin tsawon mika mulki tsakanin Pliocene da Pleistocene (game da 2.6 shekaru miliyan da suka wuce), akwai wani gagarumin nau'i nau'i, amma yana da wuya a tantance yadda m shi ne.

Yanzu wani sabon binciken da masu bincike, a Jami'ar Zurich gano cewa, kafin sanannen megafauna duniya - woolly mammoths da saber-toothed Cats - sun rinjayi da yawa antagonistic dalilai, da teku ma sha wahala asarar.

Wannan mika mulki tsakanin biyu ma'aunan kasa epochs alama canji a cikin dumi sauyin yanayi da kuma farkon m glaciation, wanda a fili ya sa wani m digo a cikin teku matakin da wani gagarumin sanyaya na ruwa.

Me dadaddun marine megafauna

Bisa sabon kimanta na daftarin burbushin halittu, masana kimiyya sun ƙarasa da cewa shi ya isa ya kashe wani abin mamaki manyan yawan manyan teku halittun: a total na daya bisa uku na marine megafauna zama dadaddun a lokacin wannan sauyin.

Mafi wuya ya buga marine dabbobi masu shayarwa, rasa 55% na bambancin. Bugu da kari, shi rasa wasu 35% na marine tsuntsaye da kuma 43% na teku kunkuru. Abin lura shi ne cewa a wannan lokacin ya zama dadaddun, kawai 9 cent na sharks, amma daga cikinsu, ya quite m da muhimmanci jinsunan.

The bacewar na Megalodon

Mu, ba shakka, magana game da Megalodon - daya daga cikin mafi girma da kuma mafi tsoron da yara a cikin tarihi na duniya, wanda ke tsiro zuwa 18 mita. Yana da ban sha'awa cewa daga lokaci zuwa lokaci a cikin shafin yanar akwai muhawwara da cewa wannan mummunan dabba har yanzu lurks wani wuri a cikin zurfin manyan tekuna.

Duk da duk wadannan labaru, masana kimiyya sun gano a fili cewa Megalodon zama dadaddun 2.6 shekaru miliyan da suka wuce. Tun da aka fara gano shaidar kasusuwan na zama, masana kimiyya sun yi kokarin gane dalilin da ya sa wannan ya faru. Mu da aka miƙa iri-iri dalilai, ciki har da rushewar da kayayyakin abinci, da} arfin gasar daga wasu dabbobi da kuma kwatsam sanyaya na cikin teku.

Kai-halakar da abinci sarkar

Wani sabon nazari a kan wannan batu da aka buga a Nature Lafiyar Qasa & mujallar Evolution. Masana kimiyya bayar da shawarar cewa asarar saboda runtse teku matakan rabe-raben na jihar bakin teku habitats ya isa ya haifar da wani taro nau'i nau'i da cewa ba zai iya tsira har ma da tsoho basking shark. A gaskiya, a cikin hanyar nau'i nau'i na Megalodon ya kai destruct abinci sarkar.

"The bude wannan taron nau'i nau'i nuna cewa nazarin halittu bambancin da marine megafauna mafi kula canje-canje da faruwa a cikin yanayi fiye da a baya tunani" - da masana kimiyya ce. Sa'an nan suka koma zuwa yanzu mutum-jawo sauyin yanayi, abin lura cewa ta "m aqibar marine megafauna kamata ba za a underestimated."