Yet, Dr Kukutai said, they had not lost their sense of being Maori, who were less likely than other New Zealanders in Australia, who were in turn less likely than all other immigrants, to have taken up Australian citizenship.
"It's something about the identity, that sense of longingness, because the notion of being Maori is so heavily rooted in being in Aotearoa. That perhaps gives the support for enduring Maori communities away from home," she said.
Although some Maori have gone overseas since the earliest days of European contact, she said the huge scale of the diaspora was a new phenomenon and required new thinking.
"Are there ways of being Maori away from home?" she asked. "How many generations can you sustain that? What about land succession?"
She said iwi organisations were trying to maintain contact with members who still had land rights at home but were now scattered around the world.
"They have set up taurahere [groups of Maori outside their ancestral lands]. My uncle is the chair of one in Perth," she said.
But organisations such as the Tuhono Trust, through which Maori people can register with their iwi, struggle with people who do not update their addresses when they move.
"You get whole families that come back for the koroneihana [annual ceremonies honouring the Maori King], but we can't always rely on that," Dr Kukutai said.
"Are we going to have podcasts, or password-protected whakapapa websites? Because it's scary to walk up to someone you don't know, and perhaps your mother or father didn't know."
She said Maori were now roughly as likely as other people born in New Zealand to be living overseas. Maori made up 15 per cent of all New Zealanders in Australia, comparable with their share of the home population.
But Maori in Australia were much younger, and more likely to be in less skilled manual jobs, than Maori who stayed in New Zealand.