Camera-trapping successfully and non-invasively reveals the presence, activity and habitat choice of the Critically Endangered White-winged Flufftail Sarothrura ayresi in a South African high-altitude wetland

• Published in: Bird conservation international 2019-09, Vol.29 (3), p.463-478
• Main Authors: COLYN, ROBIN B., CAMPBELL, ALASTAIR, SMIT-ROBINSON, HANNELINE A.
• Format: Article
• Language: English
• Subjects: Activity patterns; Altitude; Aquatic habitats; Cameras; Density; Display behavior; Endangered species; Genetic diversity; Habitat preferences; Habitat utilization; Habitats; High altitude; Occupancy; Pattern analysis; Polls & surveys; Population; Population status; Rare species; Research Article; Rope; Sarothrura ayresi; Territorial behavior; Threatened species; Trapping; Vegetation; Vegetation cover; Water depth; Wetlands
• ISSN: 0959-2709; 1474-0001
• DOI: 10.1017/S0959270918000400

The ‘Critically Endangered’ White-winged Flufftail Sarothrura ayresi is regarded as one of the rarest and most threatened rallids in Africa. Due to the species’ low density, habitat preference, cryptic colouration, elusive behaviour and lack of auditory cues has resulted in it being one of the most challenging species to survey using traditional methods such as auditory surveys and rope dragging. Numerous data deficiencies exist regarding facets of the species’ ecology, distribution, habitat-use and population status. A stratified array of nine camera localities was used within high-altitude palustrine wetland habitat to ascertain if this non-invasive technique could successfully document the first estimate of site occupancy, fine scale habitat use and activity patterns of this very rare species. Our study accumulated a total of 626 camera days and eight independent sightings of White-winged Flufftail across the respective austral summer season. Furthermore, our study confirms the applicability of camera trapping to other rare and elusive rallid species. Our results confirm that White-winged Flufftail is a low-density habitat specialist species, with site occupancy influenced positively by basal and canopy vegetation cover and detection probability influenced negatively by water depth within associated wetland habitats. Activity pattern analyses displayed that peak activity occurred at dawn and dusk, which yielded the highest degree of activity overlap with the only other migratory rallid recorded, Spotted Crake Porzana prozana. Our study also recorded the first apparent territorial display behaviour noted for the species. Our study supports the need for conservation initiatives focused on securing contiguous sections of suitable wetland habitat in order to accommodate the persistence of this globally threatened species.