LC
Scaly-breasted Kingfisher Actenoides princeps



Justification

Justification of Red List Category
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (extent of occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size has not been quantified, although is considered unlikely to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.

Population justification
The population size has not been specifically estimated, but the species is reported to be uncommon (del Hoyo et al. 2001, Eaton et al. 2021). Although eBird (2022) data suggest that it is sparsely distributed, much of its range is totally inaccessible. Moreover, Actenoides kingfishers are elusive with low detectability (Fry and Fry 1999). Within its large range remains 25,000 km2 of forest, such that even if it does prove to occur at an unusually low density/occupancy, the population size is very likely to be above 10,000 mature individuals.

Trend justification
The population was previously suspected of undergoing sustained population losses because of habitat loss. However, recent remote sensing data (Global Forest Watch 2022, based on data and methods from Hansen et al. [2013]) suggest that in the three generations to 2021, this amounted to no more than 2% loss of forest cover extent. Future projections (Voigt et al. 2021) also show the majority of this species' range remaining intact up to 2050. Consequently, although the species is thought to be declining, it is suspected of doing so only very slowly.

Distribution and population

The species is endemic to Sulawesi, Indonesia. A. p. princeps occurs in north-east Sulawesi, while A. p. erythrorhamphus is more widespread in central, north-west and south-west Sulawesi. A sighting of an Actenoides kingfisher at Gunung Tumpu, in East Sulawesi (Rheindt et al. 2014) may be attributable to an undescribed taxon of A. princeps, or an undescribed species.

Ecology

This is an inconspicuous species of Sulawesi's montane and submontane forests, where it perches unobtrusively in the forest understorey (Fry and Fry 1999). It principally occurs at 900-2,000 m (Eaton et al. 2021), but was recorded as low as 250 m (White and Bruce 1986).

Threats

The only identified threat to this species is forest loss, which is suspected to be causing slow declines in this highly forest-dependent species. In the three generations to 2021, this was low (c.2%) but may increase in the future as forests become more accessible to logging (Voigt et al. 2021).

Conservation actions

Conservation and research actions underway
No specific action is known, although this species benefits from and occurs in numerous protected areas including Dumoga-Bone and Lore Lindu National Parks, and Gunung Ambang and Tangkoko Duasudara Nature Reserves.

Conservation and research actions proposed
Conduct repeated surveys of known and potential sites across Sulawesi in order to determine abundance and population trends. Conduct ecological studies to determine levels of tolerance of secondary habitats, particularly in areas where primary forests have been extirpated. Ensure the protection of existing forest reserves.

Identification

24-25 cm. A medium-sized forest kingfisher with a dark blue head, brownish upperparts heavily scalloped with buff and finely barred pale underparts. The female has buff supercilium and moustachial stripes. 

Acknowledgements

Text account compilers
Berryman, A.


Recommended citation
BirdLife International (2023) Species factsheet: Actenoides princeps. Downloaded from http://www.birdlife.org on 07/02/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 07/02/2023.