黄喉拟水龟母体大小对繁殖性能的影响

对黄喉拟水龟Mauremys mutica同一种群中3种规格（小型个体783.0 g±55.2 g、中型个体991.3 g±62.3 g和大型个体1248.5 g±122.9 g）母体的繁殖性能进行了研究。结果表明：在繁殖季节,不同规格母体的月产卵量差异较明显,其中小型母体在产卵期首月和末月产卵量所占比例相对较高;3种规格母体的平均产卵量、受精率和孵化率与母体的大小呈正相关,平均窝数与母体大小则呈负相关;窝卵数、卵重、卵宽也与母体规格呈正相关,其中窝卵数的差异极显著（P〈0.001）。在代表卵形状的卵长径与短径比值中,小规格母体产的卵略长,但差异不显著;大规格母体产的稚龟则显著大于小规格母体产的稚龟（P〈0.05）。本研究结果表明,以大规格母体作为繁殖亲本,可以获得更多的后代。

Effects of maternal body size on reproductive parameters in Asian yellow pond turtle Mauremys mutica

The Asian yellow pond turtle Mauremys mutica as a common turtle species in East Asia is a candidate for aquaculture in China. In this paper, the effects of maternal body size （small, 783.0 g±55.2 g; middle,991.3 g±62.3 g; large, 1248.5 g±122.9 g） on reproductive parameters were studied in the turtle. There were significant differences in monthly fecundity in different maternal body sizes during the reproduction period, higher fecundity in the small maternal body size on first and last month than those in the other maternal body sizes. There was a positive relationship among egg quantity, average fecundity and incubation rate and the maternal body size within population while there was a negative relationship between the average nest number and the maternal body size. The clutch size and egg mass and egg width increased with increase in the maternal body size, very significant differences in the clutch size among the maternal body sizes （P 〈 0. 001 ）. There was greater ratio of egg length and width in the small maternal body size than that in the large maternal body sizes without significant difference, indicating that the female turtles with large body size had more offspring.