Distribution and Density Estimation of Siamang (Symphalangus syndactylus) in Way Rilau Block, Way Sekampung Resort, Batutegi Protection Forest, Lampung Province
DOI:
https://doi.org/10.26740/lenterabio.v15n1.p94-102Keywords:
primates, distribution patterns, sightings , groupsAbstract
Siamang (Symphalangus syndactylus) is a seed-dispersing primate in forest conservation. Batutegi Protection Forest is one of the siamang habitats, but there is little information on siamangs in this location, including distribution and population density. Therefore, this study was conducted to (1) map the spatial distribution and analyze the distribution pattern of siamangs, (2) analyze the individual composition of siamangs, and (3) estimate the group density of siamangs in Way Rilau Block, Way Sekampung Resort, Batutegi Protection Forest, Lampung Province. Data collection of siamangs was conducted using two methods, namely roaming (direct data) and concentration point center count modification based on the direction of siamang sounds (indirect data). Roaming was conducted on three distinct transect with two repetitions. Point centers were determined by purposive sampling according to siamang sound detection points within a radius of <700 m and the distance between siamang groups ≥200 m. The area of Way Rilau Block that became the location of this study amounted to 3 km2 or 300 ha. The results of nine days of data collection showed five groups in direct encounters and an estimated nine groups in indirect encounters from 67 sound detections. The distribution pattern of siamangs in Way Rilau Block was random (Id = 1 and Ip = 0). The individual composition of siamangs from direct encounters was 12 individuals with the highest number in the adult age class (83.3%). Based on direct encounters, the siamang group size was 2.4 individuals/group with an estimated density of 1.6 groups/km2, while the estimated density in indirect encounters was 3 groups/km2.
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