Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Passeriformes Monarchidae

Scientific Name: Chasiempis sclateri
Species Authority: Ridgway, 1882
Common Name(s):
English Kauai Elepaio, Kaua`i `Elepaio
Chasiempis sandwichensis BirdLife International (2004, 2008)
Chasiempis sandwichensis Sibley and Monroe (1990, 1993)
Taxonomic Notes: Chasiempis sandwichensis has been split into C. sandwichensis, C. sclateri and C. ibidis following AOU (2010).

Identification information: 14 cm. Small monarch flycatcher that often cocks its tail. Adults have white tips to tail feathers, white rump, and white wing bars. Immatures are reddish-brown and have rufous wingbars (VanderWerf 2001). Adult grey above, white below, rusty-tinged breast has indistinct sooty border, white throat. Similar spp. Introduced Japanese Bush-warbler Cettia diphone duller with prominent eyebrow and no white markings. Introduced juvenile White-rumped Shama Copsychus malabaricus larger, darker above, with dark spots on breast and pink legs. Voice Song a lively whistled eh-leh-PYE-o, given in series of two or three with all phrases equally emphasised (del Hoyo et al. 2006); calls include sharp chup, two-note squeak-it like dog's toy, and raspy chatter.

Assessment Information [top]

Red List Category & Criteria: Vulnerable D2 ver 3.1
Year Published: 2012
Date Assessed: 2012-05-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Contributor(s): Camp, R., Fretz, S., Gorresen, M., Pratt, T., VanderWerf, E. & Woodworth, B.
Facilitator/Compiler(s): Benstead, P., Derhé, M., Stattersfield, A., Stuart, T., Taylor, J.
This species qualifies as Vulnerable because it is restricted to a single island, on which it has a very small range, and where it is susceptible to the impacts of catastrophic events, such as hurricanes or the introduction of new alien species, that could render the species eligible for uplisting to Critically Endangered in a short space of time.

Previously published Red List assessments:
2011 Vulnerable (VU)
2008 Not Recognized (NR)
2004 Not Recognized (NR)
2000 Not Recognized (NR)
1994 Not Recognized (NR)
1988 Not Recognized (NR)

Geographic Range [top]

Range Description: Chasiempis sclateri is endemic to Kaua`i in the Hawaiian Islands (USA) (VanderWerf et al. 2009). It had an estimated population of nearly 40,000 individuals in 1968-1973, apparently reduced by c. 50% in the 1990s (Jacobi and Atkinson 1995), although this apparent decrease may be due to differences in methodology, rather than a genuine population decrease. The species now appears to be recovering well, with an increase of 13% in the mean density recorded on the Akala`i Plateau and Kôke`e region between 2000 and 2008, resulting in an estimated population size of 28,506 individuals (95% CI: 14,256-36,666) in 2008 (M. Gorresen in litt. 2011).

Countries occurrence:
United States
Continuing decline in area of occupancy (AOO): Unknown
Extreme fluctuations in area of occupancy (AOO): No
Estimated extent of occurrence (EOO) - km2: 420
Continuing decline in extent of occurrence (EOO): Unknown
Extreme fluctuations in extent of occurrence (EOO): No
Number of Locations: 1
Continuing decline in number of locations: Unknown
Extreme fluctuations in the number of locations: No
Lower elevation limit (metres): 900
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Surveys in the Alaka`i Plateau and Kôke`e region in 2008 yielded a population estimate of 28,506 individuals (95% CI: 14,256-36,666) (M. Gorresen in litt. 2011), thus the population is placed in the band 20,000-49,999 individuals.

Trend Justification:  The population was apparently reduced by c.50% by the effects of Hurricane Iniki in 1992 (Pratt 1994, Jacobi and Atkinson 1995); however, there is recent evidence from surveys that the species is now recovering, with a 13% increase in mean density in the Alaka`i Plateau from 2000 to 2008 (M. Gorresen in litt. 2011).

Current Population Trend: Increasing
Additional data:
Continuing decline of mature individuals: No
Extreme fluctuations: No Population severely fragmented: No
No. of subpopulations: 1 Continuing decline in subpopulations: Unknown
Extreme fluctuations in subpopulations: No All individuals in one subpopulation: Yes
No. of individuals in largest subpopulation: 100

Habitat and Ecology [top]

Habitat and Ecology: The species is most abundant in wet to mesic montane forest, also occurring in mesic woodland at lower densities. It feeds on insects and other invertebrates (Scott et al. 1986).

Systems: Terrestrial
Continuing decline in area, extent and/or quality of habitat: Unknown
Generation Length (years): 5.9
Movement patterns: Not a Migrant

Threats [top]

Major Threat(s): In 1992, Hurricane Iniki drastically reduced all populations (Pratt 1994). Although the species is recovering well (M. Gorresen in litt. 2011), it remains vulnerable to future catastrophic events such as hurricanes. Diseases, such as avian pox and malaria, spread by mosquitoes, are a problem at low and middle elevations, increasing mortality and possibly preventing birds from nesting (E. VanderWerf in litt. 1999, USFWS 2001, VanderWerf et al. 2006). High prevalence of mosquito-borne diseases and local declines in the species's population are associated with high rainfall (USFWS 2006, VanderWerf et al. 2006). The species is increasing despite the potentially negative impacts of introduced species, with cats (Felis catus) and rats (Rattus spp.) being potential predators, and ungulates and alien plant species causing habitat degradation. It remains susceptible, however, to the consequences of further introductions.

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
The species is monitored to a limited extent (M. Gorresen in litt. 2011) and there are several protected areas within its range.

Conservation Actions Proposed
Continue to monitor the population. Monitor actual and potential threats, particularly diseases.

Citation: BirdLife International. 2012. Chasiempis sclateri. The IUCN Red List of Threatened Species 2012: e.T22736432A39432795. . Downloaded on 10 October 2015.
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