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Tachycineta cyaneoviridis

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA AVES PASSERIFORMES HIRUNDINIDAE

Scientific Name: Tachycineta cyaneoviridis
Species Authority: (Bryant, 1859)
Common Name(s):
English Bahama Swallow
Synonym(s):
Callichelidon cyaneoviridis cyaneoviridis Stotz et al. (1996)

Assessment Information [top]

Red List Category & Criteria: Endangered C2a(ii) ver 3.1
Year Published: 2013
Date Assessed: 2013-11-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S.
Contributor(s): Gape, L., Lloyd, J., Mitchell, A., Moore, D., Rivera-Milan, F., Stahala, C., Wardle, C., White, A. & Wunderle, J.
Facilitator/Compiler(s): Bird, J., Isherwood, I., Pilgrim, J., Pople, R., Sharpe, C J, Wege, D. & Symes, A.
Justification:
This species is listed as Endangered because it has a small and declining population, which faces a number of threats that may increase in severity in the future. Renewed logging and planned housing developments may result in further declines in available breeding habitat.

History:
2012 Endangered

Geographic Range [top]

Range Description: Tachycineta cyaneoviridis breeds on Grand Bahama, Great Abaco and Andros in the northern Bahamas (AOU 1998, Raffaele et al. 1998). It may be extinct as a breeding bird on New Providence (Raffaele et al. 1998), but a few birds are seen each breeding season suggesting the presence of a relict but severely threatened population (A. White in litt. 1999). The winter distribution is poorly defined, but there are a number of records from the southern Bahamas and eastern Cuba, and small numbers appear to be resident on the breeding islands (A. White in litt. 1999). On migration, it occurs irregularly in the lower Florida Keys and through southern Florida, USA (AOU 1998). The area of breeding habitat is c.2,000 km (Allen 1996), and a population of 2,400 pairs was crudely estimated in the late 1980s (Smith and Smith 1989). There are no empirical data to confirm population trends, but anecdotal reports suggest that the species has declined considerably in numbers and is now a scarce species even in suitable habitat (J. Lloyd in litt. 2009, D. Moore in litt. 2009, F. Rivera-Milan in litt. 2009).

Countries:
Native:
Bahamas; Cuba; United States
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Smith and Smith (1989) previously estimated a global population of 2,400 pairs, i.e. 4,800 mature individuals. Anecdotal evidence suggests that the population has declined substantially since then and available survey data suggests the species occurs at low densities, even in apparently suitable habitat; consequently we cautiously assume a population of 1,000-2,499 mature individuals. This equates to 1,500-3,749 individuals in total, rounded here to 1,500-4,000 individuals.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: It nests in natural cavities and old woodpecker holes in pine Pinus caribaea woodlands (Smith and Smith 1989). It also occurs locally in towns and around human habitation, where it nests in artificial cavities and other human structures (Allen 1996). It tends to feed in open areas such as clearings in woodland, marshes, fields and along coastlines (Turner and Rose 1989). Breeding takes place in April-July (Turner and Rose 1989, Allen 1996). Movements are poorly known, but some birds undertake small-scale migrations during winter.

Systems: Terrestrial; Freshwater

Threats [top]

Major Threat(s): Logging of pines in the northern Bahamas has probably had a major impact (Smith and Smith 1989). Logging was terminated in the early 1970s, but much of the secondary forest is now approaching maturity and there are opportunities for renewed logging (Allen 1996). Planned housing developments could eliminate 8% of remaining breeding habitat (Allen 1996) and there is potential for considerable future building developments on Grand Bahama (L. Gape in litt. 2009), though in recent decades habitat loss has been modest (J. Lloyd in litt. 2009). There is competition for nest-sites with introduced cavity-nesters such as House Sparrow Passer domesticus and European Starling Sturnus vulgaris (Allen 1996). The small area of remaining habitat exacerbates the risk of hurricane-induced habitat loss (Allen 1996); the only notable habitat loss in recent years has resulted from saltwater intrusion associated with large storm surges following hurricanes in 2004 (J. Lloyd in litt. 2009). The frequency of hurricanes within the species's range may increase in coming years as a consequence of global climate change. Fire management may be important for the species as fire suppression may render areas of forest unsuitable over time (J. Lloyd in litt. 2009).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
A nest box scheme was initiated on Grand Bahama in 1995 to remedy the lack of suitable nest-holes (Allen 1996, A. Mitchell in litt. 1998). A total of 227 boxes were erected at several sites and three were occupied (Allen 1996, A. Mitchell in litt. 1998).

Conservation Actions Proposed
Survey all suitable breeding habitat and assess the status of the species and its habitat; gathering empirical evidence to clarify population trends is a priority. Assess winter distribution and habitat requirements. Study the impacts of fire suppression on the species. Maintain natural nest-sites through a pine snag management programme (Allen 1996), and potentially fire management. Assess and monitor the success of the nest box scheme. Protect remaining forest in the Bahamas and minimise the area lost to housing development and logging. Assess the impact of starling and house sparrows on the population and develop appropriate measures to reduce the threat.


Citation: BirdLife International 2013. Tachycineta cyaneoviridis. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 22 October 2014.
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