DIVERSITY OF ODONATA IN BATU HIJAU PROJECT, WEST SUMBAWA, WEST NUSA TENGGARA

• Main Author: Alifah Humaira, Anggita
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/42500
• Institution: Institut Teknologi Bandung

Increased human activity can cause changes in ecosystems that have the potential to reduce insect diversity. Batu Hijau located in West Sumbawa, West Nusa Tenggara is a mining area in which in addition to mining activities, mining and reclamation processing industries, there are residential areas, secondary forests and natural forests. Allegedly, human activity in the Batu Hijau area has an influence on ecosystem components such as aquatic ecosystems. Dragonflies and damselflies are insects that part of their life cycle in the waters and that changes in aquatic ecosystems are thought to affect the presence of dragonflies and damselflies. This study aims to examine the diversity of dragonflies and damselflies around Batu Hijau, West Sumbawa, West Nusa Tenggara. Sampling locations divided into 3 parts based on the type of water body consisting of ponds, rivers (river banks), and canals (channels). The water body type is divided into 6 stations using transect method (200 x 10 m) along the Sejorong River, Sekongkang River, Kanyolo River, Tatarloka River, reclamation canals and townsite ponds. Dragonflies and damslflies collected by using insect nets up to a range of up to 2 meters. This research was conducted for 2 months (January 2019-March 2019) in the wet month period. Sampling time is carried out in two periods, morning (08.00-11.00) and afternoon (13.00-16.00) with repetition at each station 3 times. The overall identification results found 2 sub-orders, 6 families, 16 genera, and 22 species of dragonflies and damslflies. The Libellulidae family has the highest number of species (10 species), while the Gomphidae and Euphaedidae families have the fewest species (1 species). Pantala flavescens and Euphaea lara lombokensis are the species with the most frequent encounters. The highest Shannon-Wiener diversity index is in the townsite pond in the residential area (station 2; H '= 2.14) and the lowest is in the reclamation canal (station 1; H' = 1.24) followed by the highest species richness found in the Townsite pond at residential area (station 2; S = 17) and lowest in the reclamation canal (station 1; S = 8). Pielou's evenness index is in the range (E = 0.37-0.64). There is no dominance in all stations with a value (0 <D <0.5). The body of water around Batu Hijau which includes ponds, canals and rivers are suitable habitat for dragonflies and damselflies.