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The Caves of Nam Nao National Park, Phetchabun, Thailand



Data and surveys of caves in the Nam Nao National Park, Phetchabun, Thailand.
... The SMCC continued their work in Thailand with three expeditions to the Nam Nao National Park in Phetchabun between 2003 and 2006. Here they extended Tham Yai Nam Nao to 9,817 m and explored the Tham Phaya Naak system (1,285 m, -133 m) (Ellis 2006). ...
... 716 m. First explored by a British expedition in 1992 to 4.1 km (Standing 1992) the cave was extended by the Shepton Mallet Caving Club between 2003 and 2006 to 10.1 km.(Ellis 2006). The long main streamway collects water from at least 5 large dolines. ...
... Revision of biospeleological studies and the cavedwelling fauna of Thailand has been previously done by Deharveng and Bedos (2001) and more recently the terrestrial cave-dwelling fauna was reviewed by Ellis (2006Ellis ( , 2012. Investigations on cave-dwelling fauna have been carried out since the early 20 th century but focussed only on terrestrial fauna from some caves in southernmost Thailand (Annandale et al., 1913). ...
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Groundwater fauna consists of organisms that are adapted to live their whole life-time in different types of groundwater (=aquifers): with fissured (karstic) and porous (alluvium) types as the most common. About 3800 species of obligate groundwater species (stygobionts) have been recorded worldwide and 2000 of them from groundwater in Europe. Before 1970, 19 species of stygobionts were known from Southeast Asia. After 1980, the number of stygobionts from this region started to increase, and, at present, 122 stygobionts are known here. Most of them are crustaceans, with the Copepoda, Isopoda, Amphipoda and Decapoda as the most abundant groups. Intensification of research on groundwater fauna can considerably increase the total number of stygobionts known from the region, which could rises up to several times the current tally if the intensity of research was comparable with that in Europe.
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