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Overview

Distribution

Range Description

Troglodytes sissonii inhabits arid lowland scrub and semi-deciduous forest on Isla Socorro (c.150 km2) in the Revillagigedo Islands, Mexico (Howell and Webb 1995). It was described as the second most common landbird on the island in 1991 (Santaella and Sada 1991) and remains very common at all elevations (J. Martnez Gmez in litt. 1998).

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Range

Socorro I. (Revillagigedo Islands off w Mexico).
  • Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2014. The eBird/Clements checklist of birds of the world: Version 6.9. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/

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Physical Description

Type Information

Cotype for Thryomanes sissonii
Catalog Number: USNM 50811
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds
Sex/Stage: unknown; Adult
Preparation: Skin: Whole
Collector(s): A. Grayson
Year Collected: 1865
Locality: Socorro Island, Isla Socorro, Revillagigedo Islands, North Pacific Ocean
  • Cotype: Grayson. January 9, 1868. California Farmer And Journal Of Useful Sciences. 29 (1): 7.
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© Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds

Source: National Museum of Natural History Collections

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Cotype; Type for Thryomanes sissonii
Catalog Number: USNM 50810
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds
Sex/Stage: Male; Adult
Preparation: Skin: Whole
Collector(s): A. Grayson
Year Collected: 1865
Locality: Socorro Island, Isla Socorro, Revillagigedo Islands, North Pacific Ocean
  • Cotype: Grayson. January 9, 1868. California Farmer And Journal Of Useful Sciences. 29 (1): 7.; Type: Lawrence. February-March 1871. Ann. Lyc. Nat. Hist. New York. 10 (1-3): 3.
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© Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds

Source: National Museum of Natural History Collections

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Cotype for Thryomanes sissonii
Catalog Number: USNM 39991
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds
Sex/Stage: unknown; Adult
Preparation: Skin: Whole
Collector(s): A. Grayson
Year Collected: 1865
Locality: Socorro Island, Isla Socorro, Revillagigedo Islands, North Pacific Ocean
  • Cotype: Grayson. January 9, 1868. California Farmer And Journal Of Useful Sciences. 29 (1): 7.
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© Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds

Source: National Museum of Natural History Collections

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Cotype for Thryomanes sissonii
Catalog Number: USNM 58259
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds
Sex/Stage: Male; Adult
Preparation: Skin: Whole
Collector(s): A. Grayson
Year Collected: 1865
Locality: Socorro Island, Isla Socorro, Revillagigedo Islands, North Pacific Ocean
  • Cotype: Grayson. January 9, 1868. California Farmer And Journal Of Useful Sciences. 29 (1): 7.
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© Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds

Source: National Museum of Natural History Collections

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Cotype for Thryomanes sissonii
Catalog Number: USNM 50815
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds
Sex/Stage: unknown; Adult
Preparation: Skin: Whole
Collector(s): A. Grayson
Year Collected: 1865
Locality: Socorro Island, Isla Socorro, Revillagigedo Islands, North Pacific Ocean
  • Cotype: Grayson. January 9, 1868. California Farmer And Journal Of Useful Sciences. 29 (1): 7.
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© Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds

Source: National Museum of Natural History Collections

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Cotype for Thryomanes sissonii
Catalog Number: USNM 50813
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds
Sex/Stage: unknown; Adult
Preparation: Skin: Whole
Collector(s): A. Grayson
Year Collected: 1865
Locality: Socorro Island, Isla Socorro, Revillagigedo Islands, North Pacific Ocean
  • Cotype: Grayson. January 9, 1868. California Farmer And Journal Of Useful Sciences. 29 (1): 7.
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© Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds

Source: National Museum of Natural History Collections

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Cotype for Thryomanes sissonii
Catalog Number: USNM 50812
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds
Sex/Stage: Male; Adult
Preparation: Skin: Whole
Collector(s): A. Grayson
Year Collected: 1865
Locality: Socorro Island, Isla Socorro, Revillagigedo Islands, North Pacific Ocean
  • Cotype: Grayson. January 9, 1868. California Farmer And Journal Of Useful Sciences. 29 (1): 7.
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© Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds

Source: National Museum of Natural History Collections

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Cotype for Thryomanes sissonii
Catalog Number: USNM 50812
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds
Sex/Stage: Male; Adult
Preparation: Skin: Whole
Collector(s): A. Grayson
Year Collected: 1865
Locality: Socorro Island, Isla Socorro, Revillagigedo Islands, North Pacific Ocean
  • Cotype: Grayson. January 9, 1868. California Farmer And Journal Of Useful Sciences. 29 (1): 7.
Creative Commons Attribution 3.0 (CC BY 3.0)

© Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds

Source: National Museum of Natural History Collections

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Cotype for Thryomanes sissonii
Catalog Number: USNM 50815
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds
Sex/Stage: unknown; Adult
Preparation: Skin: Whole
Collector(s): A. Grayson
Year Collected: 1865
Locality: Socorro Island, Isla Socorro, Revillagigedo Islands, North Pacific Ocean
  • Cotype: Grayson. January 9, 1868. California Farmer And Journal Of Useful Sciences. 29 (1): 7.
Creative Commons Attribution 3.0 (CC BY 3.0)

© Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds

Source: National Museum of Natural History Collections

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Cotype for Thryomanes sissonii
Catalog Number: USNM 50811
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds
Sex/Stage: unknown; Adult
Preparation: Skin: Whole
Collector(s): A. Grayson
Year Collected: 1865
Locality: Socorro Island, Isla Socorro, Revillagigedo Islands, North Pacific Ocean
  • Cotype: Grayson. January 9, 1868. California Farmer And Journal Of Useful Sciences. 29 (1): 7.
Creative Commons Attribution 3.0 (CC BY 3.0)

© Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds

Source: National Museum of Natural History Collections

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Cotype for Thryomanes sissonii
Catalog Number: USNM 58259
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds
Sex/Stage: Male; Adult
Preparation: Skin: Whole
Collector(s): A. Grayson
Year Collected: 1865
Locality: Socorro Island, Isla Socorro, Revillagigedo Islands, North Pacific Ocean
  • Cotype: Grayson. January 9, 1868. California Farmer And Journal Of Useful Sciences. 29 (1): 7.
Creative Commons Attribution 3.0 (CC BY 3.0)

© Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds

Source: National Museum of Natural History Collections

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Cotype for Thryomanes sissonii
Catalog Number: USNM 39991
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds
Sex/Stage: unknown; Adult
Preparation: Skin: Whole
Collector(s): A. Grayson
Year Collected: 1865
Locality: Socorro Island, Isla Socorro, Revillagigedo Islands, North Pacific Ocean
  • Cotype: Grayson. January 9, 1868. California Farmer And Journal Of Useful Sciences. 29 (1): 7.
Creative Commons Attribution 3.0 (CC BY 3.0)

© Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds

Source: National Museum of Natural History Collections

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Cotype for Thryomanes sissonii
Catalog Number: USNM 50813
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds
Sex/Stage: unknown; Adult
Preparation: Skin: Whole
Collector(s): A. Grayson
Year Collected: 1865
Locality: Socorro Island, Isla Socorro, Revillagigedo Islands, North Pacific Ocean
  • Cotype: Grayson. January 9, 1868. California Farmer And Journal Of Useful Sciences. 29 (1): 7.
Creative Commons Attribution 3.0 (CC BY 3.0)

© Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds

Source: National Museum of Natural History Collections

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Cotype; Type for Thryomanes sissonii
Catalog Number: USNM 50810
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds
Sex/Stage: Male; Adult
Preparation: Skin: Whole
Collector(s): A. Grayson
Year Collected: 1865
Locality: Socorro Island, Isla Socorro, Revillagigedo Islands, North Pacific Ocean
  • Cotype: Grayson. January 9, 1868. California Farmer And Journal Of Useful Sciences. 29 (1): 7.; Type: Lawrence. February-March 1871. Ann. Lyc. Nat. Hist. New York. 10 (1-3): 3.
Creative Commons Attribution 3.0 (CC BY 3.0)

© Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds

Source: National Museum of Natural History Collections

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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
This species inhabits woodland and brushy hillsides (del Hoyo et al. 2005). Its diet is unknown, but it has been observed foraging low in vegetation, on the ground, and on tree trunks. Families with fledged young have been observed in April, suggesting early breeding. One nest has been found in the knothole of a decayed tree (del Hoyo et al. 2005).


Systems
  • Terrestrial
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Troglodytes sissonii

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 2
Species With Barcodes: 1
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Source: Barcode of Life Data Systems (BOLD)

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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
NT
Near Threatened

Red List Criteria

Version
3.1

Year Assessed
2012

Assessor/s
BirdLife International

Reviewer/s
Butchart, S. & Symes, A.

Contributor/s
Keitt, B., Martnez-Gmez, J. & Tershy, B.

Justification
This species is listed as Near Threatened because it has an extremely small range on one island, but it remains very common. Any evidence of a decline in the population would qualify it for a higher threat category.


History
  • Near Threatened (NT)
  • Near Threatened (NT)
  • Lower Risk/near threatened (LR/nt)
  • Lower Risk/near threatened (LR/nt)
  • Threatened (T)
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Population

Population
Partners in Flight estimated the population to number fewer than 50,000 individuals (A. Panjabi in litt. 2008), thus it is placed in the band 20,000-49,999 individuals here.

Population Trend
Unknown
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Threats

Major Threats
The proliferation of sheep on the island since the 19th century has led to deforestation of large parts of the southern lowlands, where the species is no longer common (J. Martnez Gmez in litt. 1998). Until sheep are eradicated from the island or effectively controlled, the continuing effect of intensive grazing may reduce its already very small range. There is no direct evidence that it is preyed upon by Socorro Mockingbird Mimodes graysoni (J. Martnez Gmez in litt. 1998 contra Parkes 1990).

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Management

Conservation Actions

Conservation Actions
Conservation Actions Underway
The eradication of sheep was planned for 2008-2009 (B. Tershy in litt. 2007).

Conservation Actions Proposed
Carry out surveys to assess the population size. Monitor population trends through regular surveys. Eradicate sheep from Socorro.

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Source: IUCN

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