The effect of different habitat complexity structure on the feeding success of predatory Dragonfly and Damselfly over the four of three hours trials was tested using an artificial habitat complexity structure. Complexity of artificial habitat structure was performed using woody bamboo stick of 5 cm in length and 2 mm in diameter. The artificial habitats were set in plastic tank with length and wide of 17 cm and 11.5 cm, respectively and 5.5 cm high. The deep of water colom was about 4.5 cm. Preys were larvae of mosquitoes. There was highly significant of feeding success of predators in simple structure of habitats and significant enough in complex structure of habitats. In other words, feeding success of predatory Dragonfly and Damselfly was much higher in the simple habitats structure compared to that of the complex one. Key Words : Artificial Habitat, Damselfly, Dragonfly, Feeding, and Predatory AbstrakPengaruh kompleksitas struktur habitat terhadap keberhasilan pemangsaan predator Dragonfly dan Damselfly selama empat kali tiga jam perlakuan diteliti di laboratorium menggunakan habitat buatan. Kompleksitas struktur habitat dibuat dengan tongkat dari bambu berukuran panjang 5 cm dengan diameter 2 mm. Habitat buatan dibuat di bak plastik berukuran panjang dan lebar masing-masing 17 cm dan 11,5 cm, dan tinggi 5,5 cm dengan kedalaman kolom air sekitar 4,5 cm. Larva nyamuk digunakan sebagai pangsa dalam penelitian ini. Setiap perlakuan terdiri dari dua ulangan. Setiap perlakuan berlangsung empat kali masing-masing selama tiga jam. Hasil memperlihatkan, keberhasilan pemangsaan Dragonfly dan Damselfly sangat signifikan pada habitat stuktur sederhana, dan cukup signifikan pada habitat yang kompleks. Dengan kata lain, keberhasilan pemangsaan Dragonfly dan Damselfly jauh lebih tinggi pada habitat berstruktur sederhana dibanding dengan pada habitat berstruktur kompleks.
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