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Lowering body temperature induces embryonic diapause during prolonged egg retention in the lizard, Calotes versicolor
Bhagyashri A Shanbhag1, Srinivas K Saidapur, Rajkumar S Radder
1Department of Zoology, Karnatak University, Dharwad-580 003, India. bhagyashri_shanbhag@hotmail.com
Die Naturwissenschaften
|January 25, 2003
Abstract:
The lizard Calotes versicolor delays oviposition of oviductal eggs for as long as 6 months or more under unfavourable conditions. During this period of prolonged egg retention, the growth of oviductal embryos is arrested at stage 34. The present study shows for the first time among reptiles that the "embryonic diapause" is manifested by the gravid females by lowering their body temperature ( T(b)) by 3-5 degrees C during the period of egg retention by mechanism(s) presently unknown.