Ngakhale pali kusiyana pakati pa nsombazi ndi nsomba, asayansi apeza kuti onse ali ndi machitidwe ofanana amtundu wa superpredator, kuphatikiza kuthamanga kwakanthawi m'madzi komanso kagayidwe kachangu.
M'nyuzipepala yomwe inalembedwa mu nyuzipepala ya Genome Biology and Evolution, asayansi aku Britain akuti tuna ndi mtundu wa shark woyera wamkulu amafanana modabwitsa, makamaka pamankhwala am'magazi komanso kutulutsa kutentha. Asayansi adazindikira izi pofufuza minyewa yomwe yatengedwa kuchokera ku mitundu itatu ya sharki ndi mitundu isanu ndi umodzi ya tuna ndi mackerel.
Tuna ndi nsombazi zomwe amaphunzira zinali ndi matupi ndi michira yolimba, zomwe zimawapangitsa kuti azitha kuthamanga kwambiri. Kuphatikiza apo, amatha kutentha thupi ali m'madzi ozizira. Makhalidwe onsewa amachititsa kuti nsombazi ndi nsomba zizigwira bwino ntchito, zimatha kudzipezera chakudya ngakhale m'madzi ovuta kwambiri. Nsombayi imadziwika kuti ndi msodzi waluso wa nsomba zina zokwanira mwachangu, pomwe shark yoyera amadziwika kuti ndi mlenje wamphamvu wokhoza kusaka pafupifupi chilichonse kuyambira nsomba zazikulu mpaka zisindikizo.
Mtundu uwu umatchedwa GLYG1, ndipo wapezeka mu nsomba zonse ndi tuna, ndipo umalumikizidwa ndi metabolism komanso kuthekera kotulutsa kutentha, komwe ndikofunikira kwa nyama zolusa zomwe zimasaka nyama zopanda nzeru. Kuphatikiza apo, ofufuza apeza kuti majini okhudzana ndi mikhalidwe imeneyi alidi ofunika pakusankha kwachilengedwe ndipo amapatsira kuthekera kumeneku kumibadwo yonse yotsatira ya tuna ndi nsombazi. Kusanthula kwa chibadwa kunawonetsa kuti mitundu yonse ya nyama imapeza zikhalidwe zomwezi pakusintha kosinthika, ndiye kuti, mosadalirana.
Kupeza kumeneku kungathandize kumvetsetsa ubale womwe ulipo pakati pa majini ndi mawonekedwe athupi. M'malo mwake, kuyambira pomwe pano, kuphunzira kwakukulu pamaziko amtundu wa chibadwa pokhudzana ndi mawonekedwe akuthupi ndi kusintha kosinthika kumatha kuyamba.
