Mangareva, in Gambier Islands, Tuamotu Archipelago.
Traditionally thought to form a species-group with several other Australasian and Polynesian species (see T. sanctus). Taxonomy unclear, and much debated: nominate †gambieri sometimes considered a race of a broader T. tutus (also including T. ruficollaris), largely on the basis that it is somewhat intermediate in plumage between these two, although geographically remote from them; in such an arrangement gertrudae is then usually treated as a separate species due to plumage differences and wide geographical separation from nominate, although it is actually geographically closer than nominate to tutus; indeed, gambieri and gertrudae may constitute two separate species, or may even both be races of T. tutus, but on limited information available treatment followed herein seems the best option, at any rate for the present. Validity of Mangareva as type locality has been questioned, and it has been suggested that the single specimen might instead have come from Micronesia. Much research still required, and particularly DNA analyses of the many taxa involved, to enable a detailed taxonomic review to be made. One extant subspecies recognized.
Food and feeding
Status and conservation
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