The genus Charmosyna comprises 14 species distributed from Buru Island (Indonesia) in the west through Irian Jaya, Papua New Guinea, Bismark Archipelago, Solomon Islands, Vanuatu, Santa Cruz islands and New Caledonia. The red-throated lorikeet in Fiji represents the eastern-most range of this genus. There is little information on most species of Charmosyna, they are notoriously difficult to find and characteristically inhabit mountainous regions with high rainfall. Seven species are in the IUCN Red List (2000). The New Caledonian lorikeet is known only from two specimens collected in 1859 and an observation in 1913 and recent attempts to locate it have failed. The blue-fronted lorikeet C. toxopei is only definitively known from seven specimens collected in the 1920s. Recent attempts to locate it failed and recent sightings are considered uncertain. Reasons for the decline and rarity of Charmosyna lorikeets are cited variously as small populations and restricted range, habitat destruction and degradation, avian malaria, cyclones and invasive species.
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Montane humid forest is not under threat, but it is possible that this species has a requirement for other habitats, some of which, notably lowland semi-deciduous forests, have nearly disappeared from the island. Several Charmosyna lorikeets have undergone severe population declines or fluctuations of unknown cause. It is possible that introduced disease (such as avian malaria) or more likely mammals (notably rats) may have been a cause of decline.