LC
Coiba Spinetail Cranioleuca dissita



Justification

Justification of Red List Category
Although this species may have a small range, it is not believed to approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km² combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend appears to be increasing, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size may be moderately small to large, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.

Population justification
The species is described as fairly common. Based on transect data, the population has been estimated to number roughly 14,000-25,000 individuals (Angehr and Blewett 2010), equating to 9,000-17,000 mature individuals.

Trend justification
Following the regeneration of formerly cleared areas on Coíba Island, the population is thought to be increasing slowly (G. Angehr in litt. 2020).

Distribution and population

Cranioleuca dissita is endemic to Coiba Island and nearby Ranchería Island, Panama (Angehr and Blewett 2010). Despite suverys, to date is has not been found on other islands of the Coiba archipelago (G. Angehr in litt. 2020). The total area of primary and secondary forest on Coiba and Ranchería is estimated at c. 500 km2 (Angehr and Blewett 2010).

Ecology

The species is fairly common in dense undergrowth and vine tangles in forest and forest edge (Ridgely and Gwynne 1989, Angehr and Blewett 2010).

Threats

The species is currently not facing any severe threats. Nest predation by native predators was found to be high (Angehr and Blewett 2010). Introduced predators like rats (Rattus sp.) do not appear to be present in forested areas on Coiba (C. Monteza per G. Angehr in litt. 2020). In recent years, Coiba was colonised by Yellow-headed Caracara (Milvago chimachima), but this species is mostly confined to open areas (G. Angehr in litt. 2020).

Conservation actions

Conservation Actions Underway
The entire range is protected within Coiba National Park (G. Angehr in litt. 2020).

Conservation Actions Proposed
Prevent the introduction of invasive predators. Encourage the continued regeneration of forest in formerly deforested areas.

Acknowledgements

Text account compilers
Hermes, C.

Contributors
Angehr, G., Butchart, S., Monteza, C., Symes, A., Taylor, J. & Westrip, J.R.S.


Recommended citation
BirdLife International (2022) Species factsheet: Cranioleuca dissita. Downloaded from http://www.birdlife.org on 08/12/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 08/12/2022.