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We used telemetry to track the movements of the females of two sympatric green pit viper species, Cryptelytrops macrops and Viridovipera vogeli, in north-eastern Thailand. This has generated information on their home ranges, lengths of displacements, and vertical niche partitioning. Five female vipers were tracked simultaneously within the same general habitat for 78 days in the cold, dry season for a mean of 113.6 ± 5.38 (range: 101 129) fixes. The data show that V. vogeli had larger home ranges and greater displacements than C. macrops (0.49 ± 0.02 and 0.26 ± 0.07 ha, 38.01 ± 9.72 and 25.12 ± 2.40 m; respectively). Interestingly, V. vogeli selected arboreal sites significantly more frequently (mean 53.0 ± 14.4 % of observations, range 38.6 67.5) than sympatric C. macrops (mean 23.4 ± 13.2 %, range 5.3 49.2). We cautiously suggest that vertical stratification of these two sympatric vipers may be one factor facilitating the co-existence of otherwise morphologically similar species.

Are the habitat niches of female green pit vipers Cryptelytrops macrops and Viridovipera vogeli partitioned by vertical stratification?