SPECIES DIVERSITY OF CAVE-DWELLING SPIDERS ON SIARGAO ISLAND, PHILIPPINES
|Michael Henry D. Cabili and Olga M. NuÃ±eza*
Department of Biological Sciences, College of Science and Mathematics, MSU-Iligan Institute of Technology, Andres Bonifacio Avenue, Tibanga, 9200 Iligan City, Philippines
|Corresponding Author: Olga M. NuÃ±eza, Department of Biological Sciences, College of Science and Mathematics, MSU-Iligan Institute of Technology, Andres Bonifacio Avenue, Tibanga, 9200 Iligan City, Philippines,E-mail: [email protected]|
|Received: 15 February 2014 Accepted: 23 March 2014|
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Siargao Island is home to many caves that are interesting habitats because of their extreme environments. Spiders that are good indicators of biodiversity are also known to be common cave dwellers. However, studies on cave spiders in Siargao Island are poorly known. This study was conducted to determine the species diversity of spiders in Siargao caves. Sampling was done through modified cruising method. Eight species belonging to six families were recorded in 10 caves sites of Siargao. Caves 1 and 4 where rich guano material was present had the highest species richness. The dark zone of these caves was found to have more number of species and individuals than the entrance or twilight zone. Low species diversity with more or less even distribution was recorded in Siargao caves. It appears that the presence of guano material contributes to the higher number of spiders in caves especially in the dark zone. Physico-chemical factors such as temperature and relative humidity appear to play an important role in the distribution and abundance of spiders in the different cave zones.