And thus, when the two sets became commingled in the equatorial regions, during the alternations of the Glacial periods, the northern forms were the more powerful and were able to hold their places on the mountains, and afterwards migrate southward with the southern forms;
Eta, era horretan, glaziaraldien txandaketetan eskualde ekuatorialetan talde biak nahasi zirenean, iparreko formak izan ziren indartsuenak, eta mendietako beren lekuei eusteko eta gero, hegoaldeko formekin batera hegorantz migratzeko gai izan ziren;