||Metabolus rugensis (Hombron & Jacquinot, 1841)
||Chuuk Monarch, Truk Monarch
||del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.
||20 cm. Large, striking flycatcher. Adult male nearly all white, with glossy blue-black face and throat and black primary tips. Some are tinged pale salmon or buff below. Females dark slate, most individuals blotched with rufous feathers retained from juvenile plumage. Juveniles bright rufous above, rufous-buff below with ill-defined, buff eyebrow. Similar spp. Juveniles similar to Caroline Reed-warbler Acrocephalus syrinx, but much brighter rufous above and with less defined supercilium. Voice No well-defined song. Calls include human-like whistles slurred up or down and plaintive, querulous u-waw, reflected in the local name. Hints Slow-moving and rather tame, but surprisingly difficult to see.
|Red List Category & Criteria:
||Butchart, S. & Symes, A.
||Collins, C., Dutson, G., Pratt, H. & Scott, D.
||Mahood, S., O'Brien, A., Shutes, S., Stattersfield, A., Taylor, J.
This species qualifies as Endangered because it has a very small population, which appears to be in rapid decline owing to the loss of habitat within its small range. If this loss of habitat becomes chronic and causes the population to become severely fragmented then it may be uplisted to Critically Endangered.
|Previously published Red List assessments:|
- 2012 – Endangered (EN)
- 2008 – Endangered (EN)
- 2004 – Endangered (EN)
- 2000 – Endangered (EN)
- 1996 – Endangered (EN)
- 1994 – Endangered (EN)
- 1988 – Threatened (T)
|Range Description:||Metabolus rugensis is widely but sparsely distributed on all, or nearly all, of the high lagoon islands, as well as some of the outer reef islets of Chuuk (= Truk), Federated States of Micronesia, with highest densities reported from Tol South. It has probably never been abundant in historic times. In 1984, numbers were estimated at 2,168 (Engbring et al. 1990). Observations in 2001 suggested that it had declined to lower population densities (G. Dutson in litt. 2003). On Tol South, no birds were found in a visit in 1991 and only 3-4 birds in 1993, although birds were seen again in 2005 (C. Collins in litt. 2005). It was thought to have been extirpated from Weno after a major fire destroyed the patch of forest where it was uncommon in the 1970s (H. D. Pratt in litt. 1994); however, two males were seen in Sopo Forest in 2005 (C. Collins in litt. 2005). The species now appears to be rare on Weno (C. Collins in litt. 2011), and according to local people it is becoming rarer on Tol South (D. Scott in litt. 2011). It was not found in 2010 in an area on Dublon Island where it had been seen in 2008 (D. Scott in litt. 2011). |
Micronesia, Federated States of
|♦ Continuing decline in area of occupancy (AOO):||Yes|
|♦ Extreme fluctuations in area of occupancy (AOO):||No||♦ Estimated extent of occurrence (EOO) - km2:||500|
|♦ Continuing decline in extent of occurrence (EOO):||Yes||♦ Extreme fluctuations in extent of occurrence (EOO):||No|
|♦ Number of Locations:||11-100||♦ Continuing decline in number of locations:||Yes|
|♦ Extreme fluctuations in the number of locations:||No|
|♦ Upper elevation limit (metres):||435|
|Range Map:||Click here to open the map viewer and explore range.|