Keanekaragaman Jenis Pohon Pakan Siamang (Symphalangus syndactylus) di Jalur Ekowisata Taman Wisata Alam Sicike-Cike

Abstract

Siamangs plays an important role in the forest ecosystem, contributing to forest regeneration by consuming fruits and leaves. This study aims to identify the types of food plants and the parts eaten by Siamang (Symphalangus syndactylus), and to analyze the important value index (INP), diversity index (H’), species evenness index (E), and dominance index (C) of Siamang (Symphalangus syndactylus) food plants in the Sicike-Cike Nature Tourism Park (TWA), Dairi Regency. The method used was the transect line with vegetation observation across four growth stages (seedling, sapling, pole, and tree). The results showed 27 species of food plants, with fruits and leaves being the most consumed parts. Daphniphyllum glaucescens had the highest IVI across all growth stages, while Litsea cubeba had the lowest IVI. The diversity index (H’) ranged from 3.29 to 3.45, indicating high diversity, and the evenness index (E) ranged from 0.88 to 0.92, indicating an even distribution of species, meanwhile, the dominance index (C) ranged from 0.040 to 0.052 and was classified as low. These findings indicate that the vegetation structure in Sicike-Cike is well-suited to support the survival of the Siamang and is important for sustainable habitat conservation management.