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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. Martínez Gómez 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 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 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 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 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 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 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; 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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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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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., Martínez-Gómez, 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.

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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. Martínez Gómez 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. Martínez Gómez 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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Wikipedia

Socorro wren

The Socorro wren (Troglodytes sissonii) is a species of bird in the Troglodytidae family. It is endemic to Socorro Island, Mexico. It was formerly placed in Thryomanes but was moved to Troglodytes considering "manners, song, plumage, etc."[2] and by biogeography and mtDNA NADH dehydrogenase subunit 2 sequence analysis.[3]

Its natural habitats is the tropical arid Croton masoniiprickly pear[Note 1] shrubland and occasionally the more humid forest. It appears to prefer this habitat, limiting its presence above 600 m (2000 ft) although it does range over the whole island.[1][4]

During visits in 1953, the birds were observed to be out of breeding season in mid-March; territorial males were observed in mid-late November.[4]

The main limiting factors are by habitat destruction due to feral sheep and predation by feral cats. In 1953, it was noted to be unwary.[4] However, the IUCN does not yet consider it threatened, because especially compared to the larger birds of Socorro, it has fared not too badly and remains among the most common local landbirds.[1]

Footnotes[edit]

References[edit]

  1. ^ a b c BirdLife International (2012). "Troglodytes sissonii". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013. 
  2. ^ Howell, Steven N.G. & Webb, Sophie (1995): A Guide to the Birds of Mexico and Northern Central America. Oxford University Press, Oxford & New York. ISBN 0-19-854012-4
  3. ^ Martínez Gómez, Juan E.; Barber, Bruian R. & Peterson, A. Townsend (2005). "Phylogenetic position and generic placement of the Socorro Wren (Thryomanes sissonii)". The Auk 122: 50. doi:10.1642/0004-8038(2005)122[0050:PPAGPO]2.0.CO;2. 
  4. ^ a b c d Brattstrom, Bayard H. & Howell, Thomas R. (1956). "The Birds of the Revilla Gigedo Islands, Mexico". The Condor 58 (2): 107–120. doi:10.2307/1364977. 


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