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Overview

Distribution

Range Description

Troglodytes tanneri is endemic to Isla Clarión in the Revillagigedo Islands, Mexico. Only 20 individuals were recorded in 1986 (Everett 1988), but subsequent visits to the island have found the species to be common (Howell and Webb 1989, Santaella and Sada 1991, Wanless et al. 2009). The population was estimated at 170-200 pairs in 1988, with the highest densities around buildings and adjacent areas (Howell and Webb 1989).

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Range

Isla Clarión (Revillagigedo Islands off w Mexico).

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Physical Description

Type Information

Type for Troglodytes tanneri Townsend
Catalog Number: USNM 117515
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Birds
Sex/Stage: Female; Adult
Preparation: Skin: Whole
Collector(s): C. Townsend
Year Collected: 1889
Locality: Clarion Island, Isla Clarion, Revillagigedo Islands, North Pacific Ocean
  • Type: Townsend. September 9, 1890. Proc. U.S. Nat. Mus. 13: 133.
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Source: National Museum of Natural History Collections

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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
It occurs in all habitats throughout the island from rocks on the beach to shrubbery at the highest elevations (Santaella and Sada 1991). Nests are built in bushes, cacti, buildings and derelict vehicles (Santaella and Sada 1991, Howell and Webb 1995a).


Systems
  • Terrestrial
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Troglodytes tanneri

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 4
Species With Barcodes: 1
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
VU
Vulnerable

Red List Criteria
D1+2

Version
3.1

Year Assessed
2012

Assessor/s
BirdLife International

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

Contributor/s
Keitt, B. & Tershy, B.

Justification
This species qualifies as Vulnerable owing to its very small population and range, and hence its susceptibility to invasion by a mammalian predator.

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Population

Population
The population is estimated to number 340-400 individuals, roughly equating to 230-270 mature individuals.

Population Trend
Stable
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Threats

Major Threats
Introduced herbivores have extensively modified the native vegetation on Clarión (Stattersfield et al. 1998), but this has not had an impact upon this species. However, introduced rabbits Oryctolagus cuniculus may subsidise native predators, such as Burrowing Owl Athene cunicularia and racer snake Coluber sp. and increase their impact on wren populations. The introduction of a mammalian predator would have extremely serious consequences. The possibility of a cat introduction is small, but mouse or rat introductions are more likely (B. Tershy in litt. 1999), and there is no active introduction prevention plan in place (B. Tershy and B. Keitt in litt. 2007).

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Management

Conservation Actions

Conservation Actions
Conservation Actions Underway
The Revillagigedo Islands were declared a biosphere reserve in 1994 (Stattersfield et al. 1998). There is a plan to eradicate introduced herbivores from Clarión; pigs and sheep have already been eradicated but rabbits remain (B. Tershy in litt. 1999, Wanless et al. 2009). The Mexican navy restricts access to the island and helps to prevent further introductions (B. Tershy in litt. 1999, B. Tershy and B. Keitt in litt. 2007).

Conservation Actions Proposed
Carry out surveys to obtain an up-to-date population estimate. Monitor population trends through regular surveys. Eradicate introduced rabbits from Clarión. Continue to prevent the introduction of mammalian predators.

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Wikipedia

Clarión Wren

The Clarión Wren (Troglodytes tanneri) is a species of bird in the Troglodytidae family. It is endemic to Clarión Island off Pacific Mexico.

It looks much like a House Wren but is larger with a prominently longer bill, somewhat approaching the Carolina Wren in form.[2]

Its natural habitats are the less arid patches of shrubland,[1] notably thickets of Ipomoea halierca morning glory.[2] It also appears to occur in the garrison buildings and garden at Sulfur Bay,[1] but usually avoids the rocky shores and other exposed areas. In dense undergrowth, territories are some 10 meters (30–40 ft) in diameter.[2]

In late March 1953, males were found to be singing and threatening intruding competitors. Egg laying takes place between mid-March and mid-April.[2]

The eggs are similar to those of the House Wren, but larger and more elongated. They measure approximately 20×14 mm and also are colored basically like those of House Wrens but with fewer and crisper markings noticeably denser at the blunt end.[2]

References[edit]

  1. ^ a b c BirdLife International (2012). "Troglodytes tanneri". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013. 
  2. ^ a b c d e Brattstrom, Bayard H. & Howell, Thomas R. "The Birds of the Revilla Gigedo Islands, Mexico". Condor 58 (2): 107–120. doi:10.2307/1364977. JSTOR 1364977. 


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