Evaluation of census techniques to estimate the density of slender Loris (Loris lydekkerianus) in Southern India

Publication Type:

Journal Articles


Current Science, CURRENT SCIENCE ASSOCIATION, Volume 104, Number 8, p.1083–1086 (2013)




Density estimate, distance sampling, Loris lydekkerianus, nocturnal primate, strip transects.


Reliable estimates of species density are fundamental to planning conservation strategies for any species; further, it is equally crucial to identify the most appropriate technique to estimate animal density. Nocturnal, small-sized animal species are notoriously difficult to census accurately and this issue critically affects their conservation status. We carried out a field study in southern India to estimate the density of slender loris, a small-sized nocturnal primate using line and strip transects. Actual counts of study individuals yielded a density estimate of 1.61 ha?1; density estimate from line transects was 1.08 ha?1; and density estimates varied from 1.06 ha?1 to 0.59 ha?1 in different fixed-width strip transects. We conclude that line and strip transects may typically underestimate densities of cryptic, nocturnal primates.


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