Myrmotherula surinamensis 


Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Passeriformes Thamnophilidae

Scientific Name: Myrmotherula surinamensis
Species Authority: (Gmelin, 1788)
Common Name(s):
English Guianan Streaked Antwren, Guianan Streaked-Antwren
Taxonomic Source(s): SACC. 2006. A classification of the bird species of South America. Available at: #
Taxonomic Notes: Myrmotherula surinamensis (Sibley and Monroe 1990, 1993) has been split into M. surinamensis, M. pacifica and M. multostriata following SACC (2005).

Identification information: 9-10 cm. Small, dimorphic, relatively long-billed antwren. Male streaked black and white. Black wings with two white wing-bars. Black tail with narrow white streaks. Underparts whiter, with more sparse black streaks. Female is rufous-cinnamon on the crown and face, scaling to orange-buff on throat. Belly and flanks paler buff; wings similar to male. Similar spp. Male Cherrie's Antwren M. cherriei is more heavily streaked black, and hence looks blacker. Female M. cherrei has a much paler orange colouration than that of M. surinamensis. Voice A rattle of unmusical notes.

Assessment Information [top]

Red List Category & Criteria: Vulnerable A3c ver 3.1
Year Published: 2012
Date Assessed: 2012-05-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Taylor, J.
Contributor(s): Lees, A.
Facilitator/Compiler(s): Butchart, S., Ekstrom, J., Khwaja, N., Pilgrim, J. & Symes, A.

Based on a model of future deforestation in the Amazon basin, and the species’s susceptibility to habitat fragmentation, it is suspected that its population will decline rapidly over the next three generations, and it has therefore been uplisted to Vulnerable.

Previously published Red List assessments:
2009 Least Concern (LC)
2008 Least Concern (LC)
2004 Least Concern (LC)
2000 Not Recognized (NR)
1994 Not Recognized (NR)
1988 Not Recognized (NR)

Geographic Range [top]

Range Description: Myrmotherula surinamensis has a large range in the Guyana Shield region of South America, and is generally uncommon to fairly common (del Hoyo et al. 2003, Restall et al. 2006). In south Venezuela, it occurs in southern Delta Amacuro, Bolívar (where it is uncommon and local) and Amazonas, including presence in Yapacana National Park, Duida National Park, La Neblina National Park and Alto Orinoco-Casiquiare Biosphere Reserve (del Hoyo et al. 2003, Hilty 2003). It is found across Suriname, Guyana and French Guiana, being frequent in the latter two (del Hoyo et al. 2003, Restall et al. 2006). In north Brazil, it ranges from eastern Roraima eastwards as far as Amapá (del Hoyo et al. 2003).
Countries occurrence:
Brazil; French Guiana; Guyana; Suriname; Venezuela, Bolivarian Republic of
Continuing decline in area of occupancy (AOO): Unknown
Extreme fluctuations in area of occupancy (AOO): No
Estimated extent of occurrence (EOO) - km2: 1200000
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
Upper elevation limit (metres): 450
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The global population size has not been quantified, but this species is described as "fairly common" (Stotz et al. 1996).

Trend Justification:  This species is suspected to lose 32.5-34.4% of suitable habitat within its distribution over three generations (15 years) based on a model of Amazonian deforestation (Soares-Filho et al. 2006, Bird et al. 2011). Given the susceptibility of the species to fragmentation and/or edge effects, it is therefore suspected to decline by ≥30% over three generations.
Current Population Trend: Stable
Additional data:
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

Habitat and Ecology [top]

Habitat and Ecology: This is an understorey and middle storey species of Amazonian lowland "várzea" (seasonally flooded forest), "igapó" (permanently flooded forest) and shrubby secondary growth, occurring up to 550 m. It forages in  tangles and other dense foliage overhanging water, usually in pairs or individually, but occasionally in mixed-species flocks. It is usually confined to the bands of shrubby vegetation that immediately border rivers, streams and oxbow lakes (del Hoyo et al. 2003).
Systems: Terrestrial
Continuing decline in area, extent and/or quality of habitat: Unknown
Generation Length (years): 5.1
Movement patterns: Not a Migrant

Threats [top]

Major Threat(s):

The primary threat to this species is accelerating deforestation in the Amazon basin as land is cleared for cattle ranching and soy production, facilitated by expansion of the road network (Soares-Filho et al. 2006, Bird et al. 2011). It is thought that it may be particularly susceptible to forest fragmentation (A. Lees in litt. 2011). Proposed changes to the Brazilian Forest Code reduce the percentage of land a private landowner is legally required to maintain as forest (including, critically, a reduction in the width of forest buffers alongside perennial steams) and include an amnesty for landowners who deforested before July 2008 (who would subsequently be absolved of the need to reforest illegally cleared land) (Bird et al. 2011).

Conservation Actions [top]

Conservation Actions:

Conservation Actions Underway
None is known.

Conservation Actions Proposed

Expand the protected area network to effectively protect IBAs. Effectively resource and manage existing and new protected areas, utilising emerging opportunities to finance protected area management with the joint aims of reducing carbon emissions and maximizing biodiversity conservation. Conservation on private lands, through expanding market pressures for sound land management and preventing forest clearance on lands unsuitable for agriculture, is also essential (Soares-Filho et al. 2006). Campaign against proposed changes to the Brazilian Forest Code that would lead to a decrease in the width of the areas of riverine forest protected as Permanent Preservation Areas (APPs), which function as vital corridors in fragmented landscapes.

Citation: BirdLife International. 2012. Myrmotherula surinamensis. The IUCN Red List of Threatened Species 2012: e.T22701445A38338227. . Downloaded on 26 May 2016.
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