On the other hand, analysis with informative prior indicated contribution from the North West Shelf of western Australia (lower 95% CI > 0.00%) that was not estimated in the analysis with uninformative prior (Table 2). The regional group estimations were indicative of a contribution to Brunei Bay mainly from Southeast Asian rookeries (with uninformative prior: mean = 88.74%, 95% CI = 72.45%–98.96%; with informative prior: mean = 95.08%, 95% CI = 81.01%–99.93%) (Table 3), confirming the estimated contributions from individual rookeries