The regent honeyeater is listed as
critically endangered on the
IUCN Red List, The
Action Plan for Australian Birds 2010, compiled by researchers from
Charles Darwin University, and published in October 2011 by the CSIRO, added the regent honeyeater to the "critically endangered" list, giving habitat loss as the major threat. The bird was upgraded from endangered to critically endangered nationally (under the EPBC Act) on 9 July 2015. Each state has applied its own rating to the bird under state legislation, varying from "threatened" (Victoria) to "critically endangered" (NSW). The 2019-2020 fires would likely push the species closer to extinction, with only about 250 of the species left in the wild at that time. A genetic study published in 2019 used hybridization RAD (
hyRAD) technique on recent and
museum samples from wild birds ranging over a 100-year time frame sampled throughout the historical and contemporary range, and assessing the impact of the decline on recent and current population size, structure and
genetic diversity. The museum sampling showed that population structure in regent honeyeaters was historically low, which remains the case despite severe
fragmentation of their breeding range. Extinction may occur in this nomadic species before a detectable genomic impact of small
population size is realised. A March 2021 research study warned that the rapid decline in the rare songbird means its young are struggling to learn mating calls as adults disappear, which could further strain conservation efforts and avoid extinction. The complexity of their songs have declined, and 12 per cent of males were found to be singing other species' songs, including the
currawong and
eastern rosella. According to one of the authors of the study, this loss of song can reduce the birds' ability to find a mate, and, if they do, the female is less likely to lay an egg.
Conservation efforts A
captive breeding program on a private property in the Hunter Valley released 20 birds – 11 female and 9 male – into the wild in June 2020. In 2012, birds had been released in the same area from a
Taronga Zoo breeding program. Much work was being done to ensure that the birds had sources of food, and most of the birds were fitted with tiny
radio transmitters so that their movements could be tracked. With about 13 wild birds at the site, it was hoped that those released from captivity would breed with the wild ones and increase the population and diversity. This was the first release of regent honeyeaters since a similar event in north-eastern Victoria. In August 2020, one of the banded birds was spotted and photographed at a Hunter Valley home, for the first time since her release two months earlier. Another of the birds was found and led the conservationists to a new flock of wild regent honeyeaters near
Broke, about from the release site, of which they had not previously been aware. ==References==