Ku nkombe za Alaska, agace k'imagufwa y'imbwa yari afite imyaka ibihumbi 10. Nakhodka yabaye ibimenyetso bizwi cyane byerekana ko ari imbwa zororerwa muri Amerika ya ruguru. Irashobora kuba impaka nshya zishyigikira Hypothesi yimuka ku nkombe z'inyanja, ukurikije umucyo urumuri rushya rwabereye mu majyaruguru mu majyepfo, kuva mu nkombe za Beriki ku nkombe z'inyanja ya pasifika. Ibyerekeye Nakhodka yabwiwe mu itangazo ry'abanyamakuru rya kaminuza ya New York muri Buffalo.
Hypothesis yerekana ko uturere turi kure yinyanja, abimukira bimukiye mumajyepfo, baza ku nkombe ya Glacier, hanyuma batwikiriye igice cya cordiller. Nduhangana na verisiyo hamwe nicyo gicuruzwa cyanyuze muri Beergov cyakomeretse kandi byimbitse muri rusange, aho kugenda mu majyepfo bimaze gutangira. Gushyigikira abimukira ku nkombe, umubare munini uragaragara, harimo ibirenge byasize hashize imyaka igera ku bihumbi 13 ku kirwa cya Kaloven ku nkombe y'iburengerazuba bwa Kanada.
Ishyigikira hypothesis hamwe na hasanga haramenyekana, bivugwa mu ngingo byateguwe hagamijwe kurekura societe ya cyami B. Iki ni agace ka femur w'imbwa, tuboneka mu ntangiriro ya 2000 mu majyepfo ya Alaska, Umugabane wa East of Strangel. Icyitegererezo cyanditswe kumyaka igera kuri 10150 - iherezo ryurubura rwanyuma. Bikekwa ko gutura imbwa byabereye muri Siberiya igihe kirekire mbere yo gukemura Amerika kandi bashoboraga kugaragara hano hamwe n'abimukira ba mbere.
Charlotte Lindqvist (Charlotte Lindqvist) na bagenzi bayo bashoboye gukurikiranya genime yuzuye mitocondrindriale kandi bakayigereranya na genomes yimbwa zimwe na zimwe zigezweho kandi za kera. Muri ubu buryo, umurongo w'iyi nyamaswa wakurikiranywe ku mbwa wabaga muri Siberiya mu gihe cya nyuma cya Glacier. Ariko, birashoboka ko iyi nyamaswa yahindutse muri Amerika kubushake, yinjirayo, nta bantu.
Muri Loyer imwe (ubuvumo bw'intama), aho basanze amagufwa, bavumbuye ibisigazwa by'abantu, nubwo nyuma. Icyakora, nk'uko abahanga, ibyo bituma ibyo bisigaye bimaze kwerekana ko ubuvumo muri ibyo bihe byakundaga gutura. Byongeye kandi, ibimenyetso byabantu ba mbere biboneka mu buvumo buri hafi. Noneho, nubwo amabwiriza ataziguye mubyukuri ko iyi mbwa yari murugo, oya, muri rusange irashobora kumenyekana bishoboka. Kimwe cyerekana ibintu bitaziguye ibigize isotopi yicyitegererezo. Ahamya imirire ikungahaye mumafi, inyama zinjangwe zo mu nyanja ndetse na baleine.
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