Why did early Polynesian settlers need to bring useful plants and domestic animals to the islands?

Early Polynesian settlers needed to bring useful plants and domestic animals because the islands they colonized—particularly the initial settlements in western Polynesia—were largely devoid of the resources necessary for human habitation.1

To establish sustainable societies, these settlers transported a wide variety of subsistence items, including essential crops and livestock. These introductions were vital for several reasons:1

• Dietary Staples: Settlers relied on horticulture to produce the core of their diet, including yams, taro, breadfruit, bananas, sugarcane, and coconuts.2
• Resource Versatility: Beyond food, these plants provided critical materials for daily life. For example, breadfruit trees supplied wood for dugout canoes, while pandanus leaves were essential for weaving mats and candlenut was used for torches.2
• Animal Protein: Because many remote islands lacked native land mammals, settlers introduced pigs, dogs, and chickens to serve as reliable food sources.34

The success of these introductions often depended on the local environment, as some tropical cultigens could not survive in the colder climates of islands like New Zealand or Easter Island.2