Temporal trends in prehistoric fishing in Palau, Micronesia over the last 1500 years

Previous research at the Chelechol ra Orrak site in Palau, Micronesia suggested that fishing may have declined prehistorically over the past two thousand years. Here we discuss the analysis of an additional suite of archaeofish remains recovered from the site that significantly expands the size of the previous assemblage, providing a more robust interpretation of prehistoric fishing in the archipelago. Results indicate that although all phases of occupation show diverse and relatively equitable exploitation of fish taxa, there are statistically significant changes in fishing over time when feeding guild (general ecological niche) is considered. In addition, the number of fish remains declines by an order of magnitude between early (1400-1240 BP) and later (1290-720 BP and 500-0 BP) occupation phases. Although various factors may be responsible for this dramatic decrease, it is generally correlated with settlement changes and possible increasing agricultural production in Palau. Thus, a decline in the overall importance of fishing may account for the changes observed in the archaeofish assemblage over time.