. Asiatic herpetological research. Reptiles -- Asia Periodicals; Amphibians -- Asia Periodicals. 1999 Asiatic Herpetological Research Vol. 8, p. 33 Hrs. 12 14 16 1! 20 22 00 02 04 06 08 10 12. Hrs. 13 15 17 19 21 23 01 03 05 07 09 11 13 No. Figure activity of two Ranodon sibiricus speci- mens kept in an aquarium under natural lighting condi- tions for eight days and nights in December 1994, based on the IR light/photocell method. Level of statis- tical significance: * P< light intensity there was a bit lower and the activity probably started at a light value very close to 5 lux.
. Asiatic herpetological research. Reptiles -- Asia Periodicals; Amphibians -- Asia Periodicals. 1999 Asiatic Herpetological Research Vol. 8, p. 33 Hrs. 12 14 16 1! 20 22 00 02 04 06 08 10 12. Hrs. 13 15 17 19 21 23 01 03 05 07 09 11 13 No. Figure activity of two Ranodon sibiricus speci- mens kept in an aquarium under natural lighting condi- tions for eight days and nights in December 1994, based on the IR light/photocell method. Level of statis- tical significance: * P< light intensity there was a bit lower and the activity probably started at a light value very close to 5 lux. It increased gradually over the next hour (Fig. 5). Observations of aquatic and terrestrial ran- odons By far the majority of active ranodons were found in the water, not on land. The frequencies of finds made on land relative to the total number of ranodon counts were only (N=425) and (N=279) for August 1994 and June 1995, respectively. The number of ranodons counted on land alongside the brooks was thus relatively low, but sometimes increased when the number counted in the water increased. Animals walking on the moist grassy ground beside the brooks had a wet skin and were considered not to be really terrestrial, but aquatic ani- mals which had only left the water temporarily for some reason. Not all ranodons were active to the same degree at the same time, not even near midnight. In June 1993, when we counted ranodons on land at hrs., when the activity was at its highest, 14 were seen walking along the bank, but another 11 really ter- restrial specimens (with a dry skin) were still passive and very sluggish, hiding under stones. Discussion The activity pattern Ranodon sibiricus proved to be highly nocturnal, with very little, if any, activity during the day. An exception was the young larvae (0+) in August, in part also the one-year old larvae (1 + ) in June, which showed a cer- tain amount of diurnal as well as nocturnal activity. The 5-min. read
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