IUCN Red List Assessment
Red List Category Year Assessed
Near Threatened Red List Criteria Version
BirdLife International Reviewer/s
Butchart, S. Contributor/s
Flint, B., Gilman, E., Lewison, R., Mitchell, L., Nisbet, I., Rivera, K., Shaffer, S. & Young, L. Justification
This species has rebounded from declines in the late 1990s and early 2000s, perhaps because apparent changes in the breeding populations reflected large scale environmental conditions that affected the number of birds that returned to the colonies to nest rather than actual declines in the population. Given the difficulty of predicting long-term trends for such a long-lived species, and the number of documented threats and the uncertainty over their future effects, the species is precautionarily projected to undergo a moderately rapid population decline over three generations (84 years), and as such qualifies as Near Threatened (nearly qualifies for listing as threatened under criterion A4bd).