Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Passeriformes Parulidae

Scientific Name: Dendroica cerulea
Species Authority: (Wilson, 1810)
Common Name(s):
English Cerulean Warbler
Taxonomic Source(s): AERC TAC. 2003. AERC TAC Checklist of bird taxa occurring in Western Palearctic region, 15th Draft. Available at: # _the_WP15.xls#.
Identification information: 12 cm. Small canopy-dwelling wood-warbler. Male has sky-blue upperparts, with two white wing-bars. Underparts are mostly white with a narrow blue breast band and flank streaks. Female plumage mirrors that of the male but the blue is replaced by a greenish-blue. Voice Song is a high-pitched rather musical buzz.

Assessment Information [top]

Red List Category & Criteria: Vulnerable A2c+3c+4c ver 3.1
Year Published: 2012
Date Assessed: 2012-05-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Contributor(s): Butcher, G., Sharpe, C J, Rengifo, C. & Islam, K.
Facilitator/Compiler(s): Benstead, P., Bird, J., Harding, M., O'Brien, A., Sharpe, C J
This species is listed as Vulnerable, because its population is estimated to have undergone a rapid decline owing to continuing habitat loss and fragmentation on its breeding and wintering grounds.

Previously published Red List assessments:
2008 Vulnerable (VU)
2004 Vulnerable (VU)
2000 Lower Risk/least concern (LR/lc)
1994 Lower Risk/least concern (LR/lc)
1988 Lower Risk/least concern (LR/lc)

Geographic Range [top]

Range Description: Dendroica cerulea breeds from Quebec and Ontario (Canada), east to Nebraska and south to northern Texas, Louisiana, Mississippi, Alabama and Georgia (USA) (A.O.U. 1983). A four year study from 1997-2000 identified several seemingly key sites that support large populations (Rohrbaugh et al. 2001). These included the Cumberland Mountains north-west of Knoxville, Tennessee; the Montezuma wetlands complex and adjacent areas in central New York; the Kaskaskia River Valley and Shawnee National Forest in south eastern Illinois; Big Oaks National Wildlife Refuge (formerly Jefferson Proving Ground), Morgan-Monroe and Yellowwood state forests, and Hoosier National Forest of southern Indiana (Register and Islam 2008); Queens University Biological Station in south eastern Ontario; the Kalamazoo River of south western Michigan; the Eleven Point and Upper Current rivers in Missouri; the Shenendoah National Park and Blue Ridge Highway in western Virginia; and the Delaware River Valley and adjacent highlands of north western New Jersey. These areas may represent primary areas for population monitoring and conservation (Rohrbaugh et al. 2001). It migrates south through the south-eastern USA, the Bahamas, Cuba, Jamaica, the Caribbean slope of Mexico, Belize, Guatemala, Honduras, Costa Rica and Panama, and winters from Colombia and Venezuela south, mainly east of the Andes, to eastern Ecuador, south-eastern Peru and perhaps occasionally to northern Bolivia (A.O.U. 1983, Herzog et al. 2009). Breeding Bird Survey results show declines equating to 26% per decade over the period 1980-2002, but longer-term declines are even more severe (Sauer et al. 2003).

Countries occurrence:
Bahamas; Barbados; Belize; Bolivia, Plurinational States of; Canada; Colombia; Costa Rica; Cuba; Ecuador; Guatemala; Honduras; Jamaica; Mexico; Nicaragua; Panama; Peru; United States; Venezuela, Bolivarian Republic of
Bonaire, Sint Eustatius and Saba; Brazil; Cayman Islands; Curaçao; Puerto Rico; Saint Lucia; Sint Maarten (Dutch part); Trinidad and Tobago
Continuing decline in area of occupancy (AOO): Unknown
Extreme fluctuations in area of occupancy (AOO): No
Estimated extent of occurrence (EOO) - km2: 815000
Continuing decline in extent of occurrence (EOO): Unknown
Extreme fluctuations in extent of occurrence (EOO): No
Number of Locations: 11-100
Continuing decline in number of locations: Unknown
Extreme fluctuations in the number of locations: No
Lower elevation limit (metres): 500
Upper elevation limit (metres): 2000
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Rich et al. (2003).

Trend Justification:  This species has undergone a large and statistically significant decrease over the last 40 years in North America (-83% decline over 40 years, equating to a -35.8% decline per decade; data from Breeding Bird Survey and/or Christmas Bird Count: Butcher and Niven 2007).
Current Population Trend: Decreasing
Additional data:
Continuing decline of mature individuals: Unknown
Extreme fluctuations: No Population severely fragmented: No
No. of subpopulations: 2-100 Continuing decline in subpopulations: Unknown
Extreme fluctuations in subpopulations: No All individuals in one subpopulation: No
No. of individuals in largest subpopulation: 1-89

Habitat and Ecology [top]

Habitat and Ecology: Breeds in mature deciduous forest (A.O.U. 1983, Sibley and Monroe 1990), often in the vicinity of swamps (Curson et al 1994). Birds preferentially locate territories in forests with higher canopy height, greater canopy cover (c. 85%) and larger trees (Roth and Islam 2008). Wintering birds are found in Andean submontane forest, mainly between 1,000 and 2,000 m (Curson et al. 1994). Traditional shade coffee plantations are an important wintering habitat supporting densities of cerulean warblers 3-14 times higher  than those of neighbouring primary forest (Bakermans et al. 2009). Migrating birds are recorded from a variety of forest woodland, secondary growth and scrub habitats (A.O.U. 1983). and dead birds have been found in páramo at 3550 m around Laguna de Mucubají, Mérida (Rengifo et al. 2005). The nest is built on the branch of a tree, and breeding takes place between May and July (Curson et al. 1994).

Systems: Terrestrial
Continuing decline in area, extent and/or quality of habitat: Unknown
Generation Length (years): 3.6
Movement patterns: Full Migrant

Threats [top]

Major Threat(s): Degradation of habitat through land use change is the major threat to this species. Conversion of mature deciduous forest to agricultural or urban areas, fragmentation and increasing isolation of remaining mature deciduous forest, the change to shorter rotation periods and even-aged management, and loss of key tree species to disease are all breeding season constraints (Hamel 2000). Mountaintop mining constitutes a known but as yet uncontrolled threat on the breeding grounds, primarily in West Virginia, Virginia, Tennessee and Kentucky (G. Butcher in litt. 2003). Wintering habitat is also threatened by conversion to other land uses such as pastureland, subsistence crops and coffee plantations, and is converted into coca plantations which have a detrimental effect on suitable primary forest habitat. Conversion from shade to sun coffee reduces habitat quality for cerulean warblers; Colombia has converted 70% of its plantations, while Venezuela lost 38% of its plantations between 1950 ansd 1990 (Bakermans et al. 2009). Attempts to eradicate coca plantations will also potentially damage forests (Hamel 2000). 

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
It is listed as a species of concern on the U. S. Fish and Wildlife Service website where full details of the species's status and conservation actions are listed. Current activities include planning projects that use estimates of minimum tract size for the species as criteria for habitat acquisition and protection, land protection and acquisition projects to increase the amount of forest in certain areas such as the Interior Low Plateaus and Coastal Plain of Tennessee, and the Cerulean Warbler Atlas Project, an information gathering project managed by Cornell Laboratory of Ornithology (Hamel 2000). A symposium was held in 2006 to address the species's conservation (Dawson 2006), followed by a summit in 2007 focussing on the development and implementation of conservation actions (Anon 2007). A reserve was created specifically for the species in Colombia managed by ProAves Colombia, the first reserve in South America specifically for a neotropical migrant landbird. Shade grown coffee is promoted as Cerulean warbler friendly. Over 1 million acres of bottomland forest in the USA have been replanted with native hardwoods.

Conservation Actions Proposed
Understand fully the requirements of the species in terms of ideal or high quality breeding habitat. Develop and test forest-stand management techniques that result in "ideal" or "high quality" habitat. Protect intact primary forest ecosystems to maintain wintering populations. Prevent the conversion of shade coffee agroecosystems (which support high densities of wintering Cerulean warblers) into cattle lands (C. Rengifo in litt. 2012). Urgently protect key sites for the species in its breeding and non-breeding range. Conduct thorough environmental impact assessment prior to any mining operations to ensure that measures are taken to avoid destroying habitat and to mitigate against any negative impacts.

Citation: BirdLife International. 2012. Dendroica cerulea. The IUCN Red List of Threatened Species 2012: e.T22721740A39855975. . Downloaded on 09 October 2015.
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