NT
Green Broadbill Calyptomena viridis



Justification

Justification of Red List Category
Although this species remains common in many parts of its large range, it is considered Near Threatened as it is highly sensitive to habitat loss and degradation, which are likely to have caused moderately rapid population declines throughout its range.

Population justification
The population size of this species has not been quantified; it is considered fairly common to locally common.

Trend justification
Data on trends are lacking, but declines have inevitably occurred as this species is very sensitive to logging, and continued habitat loss throughout its range has been rapid and extensive. An on-going and moderately rapid population decline is therefore suspected overall.

Distribution and population

Calyptomena viridis occurs in the Sundaic lowlands, from south Tenasserim, Myanmar, peninsular and west Thailand, Sabah, Sarawak and Peninsular Malaysia, Singapore (formerly), Kalimantan (including the Natuna Islands) and Sumatra (including offshore islands), Indonesia and Brunei (BirdLife International 2001). It is locally common to fairly common in suitable habitat.

Ecology

This species occurs primarily in the understorey of primary evergreen and mixed dipterocarp forest in the lowlands, principally below 800 m, but occasionally to 1,700 m. It is also found in tall secondary forest and other secondary habitats if primary forest is adjacent. These habitats may only be used for foraging. Studies have revealed marked declines in density following logging activities (del Hoyo et al. 2003).

Threats

Rates of forest loss in the Sundaic lowlands have been extremely rapid, owing partly to the escalation of illegal logging and land conversion, with deliberate targeting of all remaining stands of valuable timber including those inside protected areas. Forest fires have also had a damaging effect (particularly in 1997-1998).

Conservation actions

Conservation Actions Underway
No targeted conservation actions are known for this species, although it occurs in a number of protected areas.

Conservation Actions Proposed
Conduct repeated surveys across the species's range to determine the magnitude of declines and rates of range contraction. Conduct ecological studies to improve understanding of its precise habitat requirements, tolerance of secondary habitats and response to fragmentation. Campaign for the protection of remaining tracts of lowland forest throughout the species's range.

Acknowledgements

Text account compilers
Benstead, P., Gilroy, J., Taylor, J.


Recommended citation
BirdLife International (2020) Species factsheet: Calyptomena viridis. Downloaded from http://www.birdlife.org on 29/10/2020. Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 29/10/2020.