Why did Melanesian settlements often shift locations over time?

In traditional Melanesian culture, settlements often shifted locations primarily to follow cultivation cycles.

Many groups relied on slash-and-burn horticulture, a system of shifting cultivation where rainforest gardens were cleared, planted, and harvested before being left fallow for extended periods. Because this agricultural practice required moving to new plots of land, local groups frequently occupied homesteads and hamlets for only short periods before relocating.12

While larger, more permanent settlements were common in coastal environments where resources were more stable, smaller and more mobile settlements were characteristic of the interior. In these interior regions, the need for defense also influenced settlement placement; communities often sited themselves on ridges and peaks or clustered together when faced with the threat of surprise attacks.2