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Macro-invertebrates help maintain the stability of the wide niches of faunal assemblage of caves. This study was conducted to determine the diversity and relative abundance of macro-invertebrates in the recently-explored Mighty Cave in Tagoloan, Lanao del Norte. Sampling was conducted using hand-searching, direct counting and pitfall trap methods in four cave zones. Ten species of macro-invertebrates belonging to six orders were recorded. Pachyrrhynchus sp. and Aceraius sp. under Order Coleoptera were found only in the twilight zone. The highest species richness and abundance were found in the deep zone where guano deposit was thickest. Macropathus sp. was the most abundant. Of the four cave zones, the transition zone 2 had the highest diversity while the twilight zone had the lowest diversity. Distribution in each of the site was more or less even. Temperature and relative humidity were significantly correlated to the presence and number of macro-invertebrate species. Cave development for ecotourism was identified as the major threat to the cave biodiversity.
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