||Mesitornis unicolor (Des Murs, 1845)
||Brown Mesite, Brown Roatelo
||del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
||30 cm. Slim, low-slung, terrestrial bird with small head. Dark brown on back, with paler, greyish head, variable white streak behind eye, and paler, pinkish underparts. Rather slim and short, greyish bill. Similar spp. Told from Madagascar Wood-rail Canirallus kioloides by long full tail, less pure grey on head, slim bill, and very horizontal posture. From White-breasted Mesite M. variegata by lack of conspicuous head pattern and even, mid-rufous brown underparts. Voice Song, rather rarely given, is a loud rolling chooi-whoop-chooi-whoop chooi-whoop. Hints Walks slowly around, looking for invertebrates in the leaf-litter by flicking over leaves with its bill.
|Red List Category & Criteria:
||Butchart, S. & Symes, A.
||Ekstrom, J., Evans, M., Khwaja, N., Shutes, S., Starkey, M., Symes, A., Taylor, J., Westrip, J.
This species is listed as Vulnerable because its habitat is becoming increasingly fragmented, its extent of occurrence and the area and quality of suitable habitat are decreasing, and thus its small population is suspected to be declining rapidly. Climate change may also lead to declines in its ecological niche in the future.
|Previously published Red List assessments:|
- 2012 – Vulnerable (VU)
- 2008 – Vulnerable (VU)
- 2004 – Vulnerable (VU)
- 2000 – Vulnerable (VU)
- 1996 – Vulnerable (VU)
- 1994 – Vulnerable (VU)
- 1988 – Threatened (T)
|Population:||The population is estimated to number 2,500-9,999 mature individuals based on an assessment of known records, descriptions of abundance and range size. This is consistent with recorded population density estimates for congeners or close relatives with a similar body size, and the fact that only a proportion of the estimated Extent of Occurrence is likely to be occupied. This estimate is equivalent to 3,750-14,999 individuals, rounded here to 3,500-15,000 individuals.|
Trend Justification: The population is suspected to be rapidly declining, in line with the clearance and degradation of rainforest for subsistence agriculture and timber extraction, as well as mortality from hunting and introduced predators. Also, modelling the possible effects of climate change have shown that this species's ecological niche may decline by 99.7% due to climate change over the 50 year period from 2000-2050 (Andriamasimanana and Cameron 2013). Assuming a linear decrease, this would equate to a c.37% decline in its ecological niche over its next 3 generations, from climate change alone, and considering the possible impacts from other factors the future decline is placed in the range of 30-49% (c.25% in next 2 generations, c.12% in next generation).
|Current Population Trend:||Decreasing|
|♦ Number of mature individuals:||2500-9999||♦ Continuing decline of mature individuals:||Yes|
|♦ Extreme fluctuations:||No||♦ Population severely fragmented:||Yes|
|♦ No. of subpopulations:||2-100||♦ Continuing decline in subpopulations:||No|
|♦ Extreme fluctuations in subpopulations:||No||♦ All individuals in one subpopulation:||No|
|♦ No. of individuals in largest subpopulation:||1-89|