Mixed flock of insectivorous birds in Gunung Gede-Pangrango National Park, West Java, Indonesia

Abstract

Although mixed flock has been widely studied in various locations elsewhere, very little information was reported from Indonesia. This study was aimed at re-discovering the mixed-flocks that were reported existed in Gunung Gede-Pangrango National Park three decades ago. Transects between 1,600m and 2,400m with 200 m interval were surveyed for 50h in Gunung Putri Resort. Flock size, composition, dominance and sighting probability were calculated. Five mixed flocks were re-discovered in the study site (probability 0.10), decreased in number compared to previous research (probability 0.57). The flocks were found between 2,000m and 2,300m asl, consisted of 9 species, averaging 39.6 individual birds (ranged 9-11 birds) and. Blue Nuthatch, Mountain White-eye and Little Pied Flycatcher were dominant and always part of every flock member. Ashy Drongo and Lesser Racquet-tailed Drongo could play role as flock leaders.