EVALUATION OF LEAF LITTER BAITS FOR SAMPLING INSECTS IN BULALON CAVE, BURDEOS, POLILLO ISLAND, QUEZON PROVINCE, PHILIPPINES
Altogether, 18 traps collected 1,822 insects in 24 hours. The insects were identified to 11 orders, 54 families and 102 species, with the general assumption that each morphologically different individual belongs to a different species or morpho-species. The two baits did not differ significantly (α = 0.05) in terms of average efficiency and effectiveness in all of the three zones in the cave. However, the taxonomic composition of the catches of the two traps were different (Sørensen Index of Similarity: entrance zone = 52.174, twilight zone = 55.814, dark zone = 49.123). The results suggest that both traps should be used in tandem with visual and other methods if a collection representing the entire cave insect community is desired.
Key words: cave arthropods, cave biodiversity, cave ecology, litter baiting, Polillo Island, sampling effectiveness, sampling efficiency
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