Research conducted by Flora Fauna Nusantara (FFN) in the Garahan Forest area documented diverse dragonfly species, including endemic Javan species that indicate the presence of well-preserved freshwater and forest habitats.
Research conducted by the Flora Fauna Nusantara (FFN) team in the Garahan Resort area, Sempolan region (Perhutani Forest Management Unit of Jember), revealed that the forest still functions as a suitable habitat for various dragonfly species (Odonata). Through explorations carried out in two habitat types—pine forest and natural forest—the research team documented 13 dragonfly species from several different groups.
The diversity of dragonflies recorded during the study indicates that environmental conditions within the Garahan area remain relatively stable, particularly in supporting dragonfly life cycles that are closely associated with water quality and microhabitat conditions. Dragonflies were actively observed around water sources, forest openings, and shaded vegetation areas in both habitat types.
Interestingly, each habitat contributed different characteristics to the dragonfly community structure. Natural forest habitats tended to provide more complex environmental conditions, while pine forests still supported several species adapted to more open environments.
Endemic Javan Dragonflies: Indicators of Habitat Quality
One of the notable findings of this study was the presence of dragonfly species endemic to Java, namely Paragomphus reinwardtii and Heliocypha fenestrata. Both species possess relatively specific habitat preferences and are known to be sensitive to environmental disturbances.
Paragomphus reinwardtii was commonly observed perching on rocks near moderately flowing streams, indicating the importance of maintaining natural river conditions within forest ecosystems. Meanwhile, Heliocypha fenestrata was more frequently encountered in shaded vegetated areas, especially around clear-flowing streams where it perched on surrounding leaves and branches.
The presence of these endemic species suggests that habitat quality within the Garahan forest area remains relatively good, as endemic dragonflies generally have low tolerance toward environmental changes and habitat degradation.
Paragomphus reinwardtii
Heliocypha fenestrata
💡 Interesting Insight
Dragonflies are not only visually attractive insects, but also important ecological components within freshwater ecosystems. Besides functioning as natural predators that help control insect populations, dragonflies are widely recognized as biological indicators of environmental health. Diverse and active dragonfly communities generally reflect aquatic ecosystems that are still capable of supporting stable ecological processes.
These findings demonstrate that the Garahan forest area possesses important ecological value in supporting dragonfly diversity, including endemic species. Therefore, maintaining habitat quality—especially water sources and surrounding vegetation—remains essential for preserving ecosystem balance and biodiversity sustainability within the area.
