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MOULTING IN THE ANURA: THE NORMAL MOULTING CYCLE OF BUFO REGULARIS REUSS

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SUMMARY

  • 1The normal behaviour pattern of Bufo regularis while moulting is described.
  • 2The frequency of moulting has been determined in various conditions. At 20° C. these toads moult once every four to seven days. The frequency of moulting is not influenced by size, age or feeding, nor does there appear to be any difference in this regard between the sexes; any seasonal variation is slight.
  • 3The frequency of moulting is greater at higher temperatures. Abrupt changes of temperature do not upset the moulting rhythm.
  • 4At 25° C. less than an hour before moulting the toads pale markedly. The return to normal coloration is slower, taking more than four hours.
  • 5The frequency of moulting is higher in toads kept in constant light than in those in constant darkness. In conditions of alternating light and dark there is a well marked preference for moulting during the hours of illumination at 25° and 30° C., but at 20° C. the effect is abolished. It is suggested that light can trigger the events which lead to the shedding of the skin.

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