. Asiatic herpetological research. Reptiles -- Asia Periodicals; Amphibians -- Asia Periodicals. ad., juv. N=425 0+ larvae N=151 Brook 1 ad., juv. N=75 1+ larvae N=52 18-21 June 1995 Brook 5 ad., juv. N=279 1+ larvae N=409. Figure 6. Relative degree of activity (%) of Ranodon sibiricus adults/juveniles and larvae in Brooks 1 and 5 (cf. Figs. 1-2). Young larvae (0+, and in part 1+) exhibit a markedly greater degree of diurnality than older life stages. tures reached °C. A few larvae were counted during the warmest periods, too. We made no specific study of the possible influ- ence of
. Asiatic herpetological research. Reptiles -- Asia Periodicals; Amphibians -- Asia Periodicals. ad., juv. N=425 0+ larvae N=151 Brook 1 ad., juv. N=75 1+ larvae N=52 18-21 June 1995 Brook 5 ad., juv. N=279 1+ larvae N=409. Figure 6. Relative degree of activity (%) of Ranodon sibiricus adults/juveniles and larvae in Brooks 1 and 5 (cf. Figs. 1-2). Young larvae (0+, and in part 1+) exhibit a markedly greater degree of diurnality than older life stages. tures reached °C. A few larvae were counted during the warmest periods, too. We made no specific study of the possible influ- ence of moonlight on the activity of ranodons. How- ever, when we compared our data on activity with notes on the weather, etc, we found no trend of, for instance, decreasing activity when the half moon (at the most) was sometimes shining. The light regime under such circumstances was also always well below the 5-lux limit. Ranodon sibiricus is clearly more nocturnal than, for instance, the Triturus species studied by Dolmen (1983a,b). It can also be seen that the activity period of R. sibiricus in June was shorter than in August, which is in conformity with the length of the night. A similar phenomenon was shown for the more crepus- cular Triturus vulgaris and T. cristatus in Norway (Dolmen 1983a,b). Moreover, although normally two- peaked, in northern latitudes at midsummer the crep- uscular peaks of the Triturus species fused, and the activity curve thus revealed only one, long midnight peak when real nights (<5 lux) disappeared. Espe- cially T. vulgaris, being the more crepuscular species, takes advantage of these long periods of twilight in northern latitudes in that its hunting day thereby becomes longer and its growth better. The activity period of the strictly nocturnal Ran- odon sibiricus, however, becomes shorter at midsum- mer. It is advantageous for an animal to have the opportunity to seek food for as many hours as possi- ble; the ranodons in fact spends the whole nigh
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