Abstract:
The aim of the present study was to document the population size, distribution and habitat
preferences of the Grey Slender Loris (Loris lydekkerianus) in the Popham Arboretum in Dambulla, Sri
Lanka. The Popham Arboretum is a small and isolated forest patch nestled in an urbanized landscape
that serves as a refuge for L. lydekkerianus. The study was carried out over 15 nights for a period of ten
months from September 2016 to June 2017, with nocturnal searches being conducted between 1900 to
2200 hrs. A total of 55 sightings were made, with the number of sightings per night ranging from one to
eight. The sightings suggest that the arboretum supports a population of at least 15 individuals. The loris
was more frequently sighted in core areas of the arboretum than towards the edges, with preference
shown for areas which were relatively cooler and secluded. Furthermore, the lorises were sighted in areas
with greater canopy cover and a higher richness of trees, shrubs and woody creepers. Two species, a tree
Diplodiscus verrucosus and a woody climber Derris parviflora, were selectively used by the lorises. Our
findings highlight the possible dangers of urban expansion on this arboreal primate and the need to
strengthen its protection within the arboretum.
