Ngaphandle komehluko wofuzo phakathi koshaka ne-tuna, ososayensi bathole ukuthi bobabili banezici zofuzo ezifanayo ze-superpredator, kufaka phakathi isivinini esikhulu sokuhamba emanzini kanye ne-metabolism esheshayo.
Ephepheni elishicilelwe ephephabhukwini iGenome Biology and Evolution, ososayensi baseBrithani babika ukuthi ituna kanye nohlobo lukashaka omkhulu omhlophe banokufana okumangazayo, ikakhulukazi ngokwesimetabolism kanye nokukwazi ukukhiqiza ukushisa. Ososayensi bafinyelela esiphethweni esinjalo ngokuhlola izicubu zemisipha ezithathwe ezinhlotsheni ezintathu zoshaka nezinhlobo eziyisithupha ze-tuna ne-mackerel.
Kokubili i-tuna kanye noshaka abafundile babenemizimba nemisila eqinile, okubavumela ukuthi benze ukushesha okuqhumayo. Ngaphezu kwalokho, bangakwazi ukugcina kahle ukushisa komzimba ngenkathi besemanzini abandayo. Zonke lezi zimfanelo zenza oshaka kanye ne-tuna abazingeli abasebenzayo, bakwazi ukuzitholela ukudla ngisho nasemanzini angenamusa kakhulu. I-tuna yaziwa njengomzingeli onekhono wezinye izinhlanzi ezisheshayo ngokwanele, kuyilapho ushaka omhlophe enedumela lokuba ngumzingeli onamandla okwazi ukuzingela cishe yonke into kusukela kuzinhlanzi ezinkulu kuya kolwandle.
Lesi sakhi sofuzo sibizwa nge-GLYG1, futhi sitholakale kuwo womabili oshaka nase-tuna, futhi sixhunyaniswe nemetabolism kanye namandla okukhiqiza ukushisa, okubalulekile ezilwaneni ezizingelayo ezizingela lezo zilwane ezingenamqondo. Ngaphezu kwalokho, abacwaningi bathole ukuthi izakhi zofuzo ezihambisana nalezi zici empeleni zibalulekile ekukhetheni kwemvelo futhi zidlulisela lawa makhono kuzo zonke izizukulwane ezalandela zetyhuna noshaka. Ukuhlaziywa kofuzo kukhombisile ukuthi zombili izinhlobo zezilwane zithole izici ezifanayo ngenkathi kuguqulwa okuguqukayo, okungukuthi, ngokuzimela komunye nomunye.
Lokhu kutholakala kungasiza ukuqonda ubudlelwane obuphakathi kofuzo nezici zomzimba. Eqinisweni, kusukela kuleli qophelo, kungaqala isifundo esikhulu sezisekelo zofuzo maqondana nezici zomzimba kanye nokuziphendukela kwemvelo okuguqukayo.
