||del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.
||14 cm. Yellow-olive, masked bird. Yellow-olive upperparts and crown with narrow sulphur fringe bordering black mask. Bright yellow underparts, washed ochraceous on flanks. Female lacks mask and has olive head with pale eye-ring and pale buff supercilium. Yellow underparts, washed brown on flanks and becoming white on belly. Pinkish legs. Black bill. Subspecies goldmani is duller overall with more olive upperparts and brownish wash on flanks. Border behind mask is more whitish in males. Similar spp. Common Yellowthroat G. trichas is smaller with pink on lower mandible. Males have grey border to mask (some G. trichas can have yellow border). Females duller with more indistinct facial pattern. Voice Song is rich, powerful series of phrases. Harsh tchech call.
|Red List Category & Criteria:
||Butchart, S. & Symes, A.
||Devenish, C., Howell, S., Rodríguez-Estrella, R. & Matheson, B.
||Bird, J., Calvert, R., Capper, D., Isherwood, I., Pople, R., Sharpe, C J, Symes, A., Taylor, J., Khwaja, N., Westrip, J.
This species's known range remains very small, within which suitable habitat is severely fragmented, and it has recently been extirpated from at least two sites, with rapid declines suspected in the species's range and population owing to continued habitat loss and degradation. For these reasons it qualifies as Endangered.
|Previously published Red List assessments:|
- 2012 – Endangered (EN)
- 2011 – Endangered (EN)
- 2010 – Critically Endangered (CR)
- 2009 – Critically Endangered (CR)
- 2008 – Critically Endangered (CR)
- 2004 – Critically Endangered (CR)
- 2000 – Critically Endangered (CR)
- 1996 – Vulnerable (VU)
- 1994 – Vulnerable (VU)
- 1988 – Lower Risk/least concern (LR/lc)
|Range Description:||Geothlypis beldingi has a fragmented distribution on the Baja California peninsula, Mexico. The nominate race is known from at least 15 sites (C. Devenish in litt. 2010) with important concentrations of 70 birds at Punta San Pedro, >100 or c.120 birds at Todos Santos (B. Matheson in litt. 2016) R. Rodríguez-Estrella in litt. 2016), ≤150 birds at Santiago (R. Rodríguez-Estrella in litt. 2016), and at San José del Cabo the population increased to 487-700 mature individuals probably related to a chance increase in the quality of habitat (Pronatura in litt. 2009). The race goldmani is now known from at least 12 sites including large numbers at San Ignacio (537-648 birds) and La Purísima (Rodríguez-Estrella et al. 1999, Erickson et al. 2008). However, despite being relatively common at these site, the area of suitable habitat is probably very restricted (Rodríguez-Estrella et al. 1999). It appears to have been extirpated from at least two sites, El Triunfo and San Pedro de la Presa (Erickson et al. 2008, R. Rodríguez-Estrella in litt. 2016); but, in 2009 up to three adults were present at El Oro. This might be the location referred to as El Triunfo, where the species was collected in 1924 (C. Devenish in litt. 2010). Another small breeding population was recently found at Las Cuevas (Erickson et al. 2008) and San Dionisio (Pronatura in litt. 2009), near Santiago. |
|♦ Continuing decline in area of occupancy (AOO):||Yes|
|♦ Extreme fluctuations in area of occupancy (AOO):||No||♦ Estimated extent of occurrence (EOO) - km2:||3800|
|♦ Continuing decline in extent of occurrence (EOO):||Yes||♦ Extreme fluctuations in extent of occurrence (EOO):||No|
|♦ Number of Locations:||27||♦ Continuing decline in number of locations:||Yes|
|♦ Extreme fluctuations in the number of locations:||No|
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||The current known population includes important concentrations at Punta San Pedro (70 birds), Todos Santos (120 individuals) Santiago (up to 150 birds) and San José del Cabo (487-700 adults in 2009) (Pronatura in litt. 2009, B. Matheson in litt. 2013, R. Rodríguez-Estrella in litt. 2016). Although the total population size has not been precisely estimated, it is best placed in the band 1,000-2,499 mature individuals. This equates to 1,500-3,749 individuals in total, rounded here to 1,500-4,000 individuals.|
Trend Justification: This species is suspected to be undergoing a rapid population decline owing to pressures on Baja California's oases and the resultant conversion of habitat at many sites.
|Current Population Trend:||Decreasing|
|♦ Number of mature individuals:||1000-2499||♦ Continuing decline of mature individuals:||Yes|
|♦ Extreme fluctuations:||No||♦ Population severely fragmented:||Yes|
|♦ No. of subpopulations:||10||♦ Continuing decline in subpopulations:||Yes|
|♦ Extreme fluctuations in subpopulations:||No||♦ All individuals in one subpopulation:||No|
Conservation Actions Underway
Recent surveys have improved knowledge of the species's distribution (Rodríguez-Estrella et al. 1999, Erickson et al. 2008, Pronatura in litt. 2009). The IBA Estero de San José del Cabo, a 42 ha freshwater coastal lagoon at the southern tip of the peninsula of Baja California, incorporates habitat for Belding's Yellowthroat, and was designated as a RAMSAR site in February 2008. Angeles del Estero and Agrupación Ciudadana Ecologista, two small local NGOs in the adjacent town of San José del Cabo, have a history of involvement in the conservation of the IBA. The inclusion of oases in Ordenamiento Ecológico Territorial of SEMARNAT in Mexico provides them with official protection in Baja California Sur state and municipalities that can aid in the protection of this species (R. Rodríguez-Estrella in litt. 2016). As part of the BirdLife International Preventing Extinctions Programme, Species Guardian Pronatura Noroeste are implementing the following actions (C. Devenish in litt. 2010): a conservation area plan for the Estero de San José del Cabo was developed to identify conservation targets, assess the viability of these targets, identify critical threats and develop conservation strategies; research and monitoring is underway to determine current status and threats in the Estero de San José del Cabo Ecological Reserve, and at other sites historically important for the species; clean-up days have been conducted; educational sign boards were erected at the San José del Cabo reserve; two bird festivals have been held and outreach materials have been distributed to local schools, and local bird guides are being trained (86 by the end of 2009) to raise the species's profile and strengthen livelihood links with its conservation. A conservation action plan was published in 2011 (Palacios and Galindo-Espinosa 2011).
Conservation Actions Proposed
Use standardised survey techniques to survey all potential nesting habitat in Baja California Sur and adjacent south-eastern Baja California, identifying potential new locations using satellite imaging. Conduct a thorough census of each site by counting singing males in spring in order to ascertain the current population, and repeat at regular intervals to detect local and regional trends. Conduct a formal dispersal study in order to design long-term management actions for the Belding's Yellowthroat metapopulation system. Undertake genetic studies to address questions concerning such issues as the validity of recognising two subspecies or the genetic consequences of population patchiness and potential bottlenecks (Erickson et al. 2008). Incorporate marsh creation into plans for the development of golf courses and resorts within this species's range (Erickson 2006, Erickson et al. 2008). Prohibit burning and cutting of the water-edge vegetation at all sites (Rodríguez-Estrella et al. 1999). Initiate a public awareness programme. Promote bird tourism to generate income for protecting key sites. Increase the capacity of San José del Cabo in water treatment and quality monitoring. Ensure an adequate supply of water to the oasis at San José del Cabo through water rights. Implement an education and outreach programme on the importance and environmental services of the watershed at San José del Cabo. Promote better cattle ranching practices and law enforcement (C. Devenish in litt. 2010).