Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Passeriformes Turdidae

Scientific Name: Turdus haplochrous
Species Authority: Todd, 1931
Common Name(s):
English Unicoloured Thrush, Unicolored Thrush
Taxonomic Source(s): SACC. 2006. A classification of the bird species of South America. Available at: #

Assessment Information [top]

Red List Category & Criteria: Near Threatened ver 3.1
Year Published: 2012
Date Assessed: 2012-05-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Contributor(s): Lane, D.
Facilitator/Compiler(s): Butchart, S., Gilroy, J., Mahood, S., Sharpe, C J, Taylor, J.
This species is considered Near Threatened as it has been recorded at only a handful of sites, and appears to be rare and patchily distributed. It may therefore have a moderately small population. Although this may currently be stable, future loss or degradation of its forest habitat could seriously impact the species. Conversely, if surveys locate additional populations in surrounding areas, it may qualify for downlisting to Least Concern.

Previously published Red List assessments:
2011 Near Threatened (NT)
2008 Near Threatened (NT)
2004 Near Threatened (NT)
2000 Lower Risk/near threatened (LR/nt)
1994 Lower Risk/near threatened (LR/nt)
1988 Near Threatened (NT)

Geographic Range [top]

Range Description: Turdus haplochrous is known from only a few localities in south-east Beni and west Santa Cruz, north Bolivia (Ridgely and Tudor 1994, White et al. 1995), and is apparently rare and local even within suitable habitats.

Countries occurrence:
Bolivia, Plurinational States of
Continuing decline in area of occupancy (AOO): Unknown
Extreme fluctuations in area of occupancy (AOO): No
Estimated extent of occurrence (EOO) - km2: 192000
Continuing decline in extent of occurrence (EOO): Unknown
Extreme fluctuations in extent of occurrence (EOO): No
Continuing decline in number of locations: Unknown
Extreme fluctuations in the number of locations: No
Lower elevation limit (metres): 250
Upper elevation limit (metres): 350
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: In the absence of sufficient data, this species is suspected to have a moderately small population, preliminarily estimated at 10,000-19,999 individuals, as it only occurs at a few locations and has been described as 'uncommon'. This estimate equates to 6,667-13,333 mature individuals, rounded here to 6,000-15,000 mature individuals.

Trend Justification:  This species is suspected to lose 5.8-18.9% of suitable habitat within its distribution over three generations (18 years) based on a model of Amazonian deforestation (Soares-Filho et al. 2006, Bird et al. 2011). It is therefore suspected to decline by <25% over three generations.
Current Population Trend: Decreasing
Additional data:
Number of mature individuals: 6000-15000 Continuing decline of mature individuals: Unknown
Extreme fluctuations: No Population severely fragmented: No
Continuing decline in subpopulations: Unknown
Extreme fluctuations in subpopulations: No All individuals in one subpopulation: No
No. of individuals in largest subpopulation: 100

Habitat and Ecology [top]

Habitat and Ecology: It occurs in seasonally flooded riverine forest (várzea), gallery forest, semi-open forest and semi-deciduous woodland at 250-350 m (White et al. 1995, D. Lane in litt. 2011).

Systems: Terrestrial
Continuing decline in area, extent and/or quality of habitat: Unknown
Generation Length (years): 6.1
Movement patterns: Not a Migrant

Threats [top]

Major Threat(s): The habitat occupied by this species is widespread in the Bolivian lowlands and is not currently subject to particular threat (White et al. 1995). However, the very small and patchy range implies that future changes in land-use could rapidly cause an increase in threat status.

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
Occurs in Beni Biosphere Reserve and Isiboro Secure National Park, Bolivia.

Conservation Actions Proposed
Conduct further surveys to fully determine the distribution and abundance of this species. Monitor threats to key habitats within the range. Ensure the effective protection of protected areas where it occurs.

Citation: BirdLife International. 2012. Turdus haplochrous. The IUCN Red List of Threatened Species 2012: e.T22708931A38167516. . Downloaded on 10 October 2015.
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