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Zoothera dauma

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA AVES PASSERIFORMES TURDIDAE

Scientific Name: Zoothera dauma
Species Authority: (Latham, 1790)
Common Name(s):
English Eurasian Scaly Thrush, Scaly Thrush, White's Thrush
Taxonomic Notes: Zoothera major, Z. dauma and Z. horsfieldi (Sibley and Monroe 1990, 1993) have been lumped into Z. dauma following Collar (2004). Z. imbricata from Sri Lanka, previously considered a subspecies of Z. dauma following Sibley and Monroe (1990, 1993), is treated as a distinct species following Rasmussen and Anderton (2005). The BirdLife Taxonomic Working Group follows Collar (2004, 2005) in differing from Sangster et al. (1998) and Rasmussen and Anderton (2005), by retaining aurea and neilgherriensis as races of Zoothera dauma, pending a comprehensive review of Z. dauma sensu lato.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2012
Date Assessed: 2012-05-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Facilitator/Compiler(s): Pilgrim, J., Ekstrom, J., Butchart, S., Benstead, P.
Justification:
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, but it is not believed 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.

Geographic Range [top]

Range Description: This species predominantly breeds across Siberia and the Himalayas, and winters in the northern Indian Subcontinent, northern south-east Asia, southern China, and southern Japan, but there are also some resident subspecies, including neilgherriensis in the hills of south-west India, and horsfieldi from Java to Sumbawa, Indonesia. Subspecies major was previously considered specifically distinct and Critically Endangered, with only c.58 breeding birds estimated to remain in 1996. It is confined to the islands of Amami-ooshima and Kakeroma-jima in the northern Nansei Shoto Islands, Japan.
Countries:
Native:
Bangladesh; Bhutan; Cambodia; China; India; Indonesia; Japan; Kazakhstan; Korea, Republic of; Lao People's Democratic Republic; Mongolia; Myanmar; Nepal; Pakistan; Philippines; Russian Federation; Taiwan, Province of China; Thailand; Viet Nam
Vagrant:
Austria; Belgium; Denmark; Faroe Islands; Finland; France; Germany; Iceland; Ireland; Italy; Malaysia; Montenegro; Netherlands; Norway; Oman; Poland; Romania; Serbia (Serbia); Slovenia; Spain; Sweden; United Kingdom
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The global population size has not been quantified. The species is variously described as "uncommon" to "fairly common" across much of its range (Clement and Hathway 2000), In Europe, the breeding population is estimated to number 25000-100000 breeding pairs, equating to 75000-300000 individuals (BirdLife International 2004), but Europe forms <5% of the global range.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: The taxonomy of the species has been in flux, and much more research and analysis is needed on variations in song and measurements to resolve this situation (Collar 2004).
Systems: Terrestrial

Threats [top]

Major Threat(s): Subspecies major is threatened by deforestation and invasive alien predators (BirdLife International 2000, Clement and Hathway 2000).

Citation: BirdLife International 2012. Zoothera dauma. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 27 August 2014.
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