LC
Jos Plateau Indigobird Vidua maryae



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). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size has not been quantified, 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
This is a poorly known species and no population estimates are available.

Trend justification
The population is suspected to be in decline owing to extensive habitat loss as much of its range is converted to agriculture.

Distribution and population

Vidua maryae was first discovered in 1968, but has only been considered a distinct species since 1995. It is endemic to the Jos Plateau and its north and eastward extensions, in northern Nigeria, where it is known from Panshanu, Taboru near Jos and Kagoro (Payne 1998), and has an estimated global Extent of Occurrence of 26,000 km2. The global population size has not been quantified, but the species is not believed to approach the thresholds for the population size criterion of the IUCN Red List (i.e. less than 10,000 mature individuals in conjunction with appropriate decline rates and subpopulation qualifiers). Global population trends have not been quantified, but populations appear to be stable; one site (Panshanu) is within the Magama Forest Reserve, where the vegetation is apparently little changed since 1968 (Payne 1998). It may be more common and widespread than records suggest, as it is difficult to identify outside the breeding season (J. Abalaka in litt. 2007, S. Hogberg in litt. 2007). Therefore, the species is not believed to approach the thresholds for the population decline criterion of the IUCN Red List (i.e. declining more than 30% in ten years or three generations). For these reasons, the species is evaluated as Least Concern.

Ecology

It occupies the same habitat as the Rock Firefinch Lagonosticta sanguinodorsalis, bushy and grassy rocky outcrops on the plateau and wooded, grassy inselbergs to the north and east. The species is apparently restricted to areas above 900 m (Payne 1998). V. maryae mimics the songs of L. sanguinodorsalis and, whilst there are no direct observations of brood parasitism, their association as host and brood parasite is assumed, as in other species in which indigobird parasitism has been observed the indigobird male mimics the song of the host that is known to rear its young (P. Hall in litt. 1999).

Threats

The Jos Plateau has a high human population density and has consequently suffered from major agricultural expansion. Most of the original woodland vegetation has been lost, with the remainder restricted to inaccessible areas or river margins. One known site (Taboru) is intensely grazed and the remaining wooded vegetation is rapidly being removed for fences and firewood (Payne 1998).

Conservation actions

Conservation Actions Underway
There are plans to establish a conservation programme at Taboru (P. Hall in litt. 1999). A study of this species and L. sanguinodorsalis began in 2006 (J. Abalaka in litt. 2007).

Identification

12 cm. A small, black finch with a pale bill. Nuptial plumage male has an all black plumage with a green glossy sheen. The flight feathers are brown and appear pale in contrast to remainder of plumage. The bill, legs and toes appear white in the field. Close inspection of legs and toes show a purplish cast. Similar spp. Within its very restricted range there no other indigo birds have been seen. Voice Mimics the trilling song and calls of the Rock Firefinch. Hints A search in the breeding season of the Panshanu Pass, Taboru Hill near Jos and at Kagora in northern Nigeria might produce this species.

Acknowledgements

Text account compilers
Ekstrom, J., Gilroy, J., Symes, A., Butchart, S., Fisher, S., Harding, M.

Contributors
Hogberg, S., Hall, P., Nursahid, R.


Recommended citation
BirdLife International (2022) Species factsheet: Vidua maryae. Downloaded from http://www.birdlife.org on 18/05/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 18/05/2022.