Status
Described from two skins (both females) collected somewhere on New Caledonia before 1860 (Berlioz 1945). One has since disappeared. The other is in the MNHN (specimen 762A). Sarasin & Roux (1913) report a claim that the species existed near Oubatche; one bird was shot but could not be preserved. Layard & Layard (1882), while not observing birds themselves, report there were rare sightings up to 1880. Forshaw & Cooper (1989) cite Anthony Stokes, who in December 1976 collected reports on sightings: An older local identified it from a colored plate and claimed to have observed a single bird in shrubland near Lake Yaté "many years ago," possibly in the 1920s. A forestry official claimed to have twice seen two individuals fly overhead, once in 1953 or 1954 on the La Foa-Canala road, and once on June 3, 1976, W of Mt Panié. However, none of these claims could be confirmed, and all searches (e.g., 1938 by MacMillan) have been fruitless. Stokes also reported that collectors coming to New Caledonia to search for this bird offered rewards for live or dead specimens.
Opinion is divided on whether the New Caledonian Lorikeet still exists. King (1981) lists it as extinct since 1860, which is certainly not correct. Most authors hope someone will yet rediscover the New Caledonian Lorikeet. This hope isn't unrealistic, given that the subject would be a very small, inconspicuous bird in a large, wild area that is difficult for ornithological field work. The 1999 rediscovery of Aegotheles savesi, which was known only from a single male skin for 119 years, provides encouragement. A 6-month search expedition to the Mt. Ignambi area in 1998 did not find the species, and locals were not familiar with it. New surveys of highland rainforests are planned for 2006/2007 .
Reasons for the species' rarity are unknown. There seems to have been a marked decline in the numbers of two of the other three parrots native to New Caledonia (the New Caledonian Red-crowned Parakeet and the Horned Parakeet. Deplanche's Lorikeet is still common), also for unknown reasons. New Caledonian bird populations decline wherever habitat is modified, which supports the hypotheses that human interference impacts the birds in a serious way. However, C. diadema's post-1880 decline—if real—took place too early for habitat destruction to have been a decisive factor. Neither could capture for the cage bird trade have influenced the decline. Introduced cats or rats could have been responsible for the decline, or an introduced disease, or a combination of these factors and subtle habitat changes. For example, the large-scale destruction of lowland forest may have deprived the species of a food source they seasonally depended on. The introduction of cats and European rats in the mid-19th century fits the assumed pattern of decline; however, cats probably didn't spread over the whole island until recent times. Rats, especially black rats, which are arboreal, probably represent a serious threat, but the species did not succumb to the prehistoric arrival of the Polynesian rat.
For whatever reason, the New Caledonian Lorikeet is an extremely rare and elusive bird. The rarity could be caused in part by the elusiveness. Its relative, the Red-throated Lorikeet, feared extinct since the beginning of the 20th century, apparently survived in considerable numbers to the 1970s. However, it is more likely C. diadema is genuinely rare. Based on distance between sightings and remaining prime habitat, any remaining populations are probably small and geographically fragmented.
The New Caledonian Lorikeet, like most parrots, is listed in CITES Appendix II (since June 6, 1981) and European Union regulation 338/97 Appendix B (since June 1, 1997). It is listed as Critically Endangered (D1) by IUCN, which means that the effective population size is likely to be less than fifty individuals.
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