Countries of Occurrence:
Saint Helena - British Overseas Territory
Pryce, D. & White, L.
Facilitators / Compilers/s:
This species was common at intermediate and higher elevations in the mid- to late-1960s (Clark and Benoit 1977). The most recent island-wide survey (Mendel, Ashmole and Ashmole 2008) found the species still to be common in the higher parts of its range; however, it was only found at one site at intermediate levels from which it is inferred that the species is declining. It has an extent of occurrence (EOO) and area of occupancy (AOO) both of 20 km² and occurs at eight locations. Therefore, it is assessed as Vulnerable.
This species is endemic to the island of St Helena, in the South Atlantic Ocean, where it is mostly present at intermediate levels and the uplands
During the Peaks survey of 2005-6 (Mendel, Ashmole and Ashmole 2008) this species was found to be quite widespread in the highest portions of the island. However, this species was found only twice at lower elevations where it had been found to be much more widespread during the two Belgian expeditions to the island in the mid- to late-1960s (Clark and Benoit 1977). With the spread of invasive non-native plant species and an increase in predators that compete for resources with it (as well as potential direct predation), a population decline is inferred
The species is mostly associated with intermediate and especially the higher elevations on the island but has also been found once at Lemon Grove in the lower Sandy Bay valley (Clark and Benoit 1977). It appears to have a preference for more moist habitats at middle levels; otherwise its ecology is unknown
Habitat quality decline due to the spread of invasive non-native plant species and an increase in non-native predators that will also be competing for resources threaten this species
Any research and monitoring of this species would be of value. Of critical importance is the continued expansion and linking of habitat fragments as well as removal of invasive non-native species where this is possible