圈養中之蓬萊草蜥（Takydromus stejnegeri）連續四窩蛋的生產現象

A Production of Four Successive Clutches of Eggs by a Female Grass Lizard (Takydromus stejnegeri van Denburgh) in Captivity

A female grass lizard Takydromus stejnegeri van Denburgh was captured after mating in the field on 24 April 2003. It was immediately brought back to the laboratory and kept under observation. It produced four clutches of eggs from10 May to 22 June. The average time interval of the successive clutches was 14.75 days, and the average clutch size was 2.75 eggs. The production of the successive clutches without mating in captivity may be due to the sperm storage in the female reproductive tract. The fertilization ratio and hatching ratio were 100% for the first three clutches, but only 33.3% and none, respectively, for the fourth clutch. The clutch order was significantly positively correlated with egg width and also with egg weight. T. stejnegeri was an intermediate egg retainer, whose gestation (egg retention) period was at an average of 25% of the total embryonic development period. 2003年4月24日於野外捕捉到一隻剛交配過的雌性蓬萊草蜥，隨即帶回實驗室飼養及觀察。被隔離的雌蜥於同年5月10日至6月22日間連續產下四窩蛋，此四窩蛋產出的間隔平均為14.75 天，每窩平均2.75個蛋。此圈養後無再次交配的連續性生產現象，表示該雌蜥可能具有精子儲存的能力。前三窩的受精率及孵化率均為100%，而第四窩其值則分別降為33%及0%。此四窩蛋的產出順序與蛋的寬度及重量呈現顯著性地正相關。蓬萊草蜥所產下的蛋屬於居中型的胚胎發育，其胚胎保存在雌蜥體中的平均時間約佔總成長時間的25%。