Yu, Du, Longhui, Lin, Yuntao, Yao, Chixian, Xiang, Ji
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引用次数: 3
Abstract
Body size and female reproduction in the water monitor lizard (Varanus salvator) were studied. Forty-two adult females larger than 500 mm SVL and 32 adult males larger than 400 mm SVL were donated by local people in Ledong, Hainan under permit to our laboratory in Hainan in 2013 and 2014. The largest male and female measured 745 and 755 mm SVL, respectively. The mean SVL was greater in adult females than in adult males. Males had larger heads (head width) than females of the same SVL. The smallest reproductive female in our sample was 565 mm SVL. Females produced a single clutch of 17.1 (10−23) pliable-shelled eggs per breeding season stretching from mid-June and mid-September. Clutch size and clutch mass were all positively related to female SVL. However, there was no significant linear relationship between egg mass and female SVL. Larger females generally produced more eggs, and thus heavier clutches than did smaller ones. There was no significant linear relationship between relative clutch mass and female SVL. Phylogenetic generalized least squares (PGLS) analysis, accounting for phylogenetic relationships, showed that clutch size was positively correlated with mean maternal SVL in varanid lizards. PGLS analysis showed that phylogenetic relationships did not affect clutch (or/and egg) mass and the SVL although there were significant linear relationship between clutch (or/and egg) mass and mean maternal SVL. Therefore, we could draw some general conclusions about the body size and reproductive tactics in varanid lizards that larger females generally produced more eggs, larger eggs and thus heavier clutches than did smaller ones.
对水蜥的体型和雌性繁殖进行了研究。2013年和2014年,经许可,海南乐东当地居民将SVL大于500 mm的成年女性42名和SVL大于400 mm的成年男性32名捐赠给我们海南实验室。最大的雄性和雌性的SVL分别为745和755毫米。成年女性的平均SVL高于成年男性。在相同SVL下,雄性的头(头宽)大于雌性。我们样本中最小的生殖雌性为565 mm SVL。从6月中旬到9月中旬的每个繁殖季节,雌性产一窝17.1(10−23)枚柔壳蛋。离合尺寸、离合质量与女性SVL均呈正相关。但卵量与雌性SVL之间无显著的线性关系。体型较大的雌性通常产下更多的卵,因此比体型较小的雌性产下更多的卵。相对离合器质量与雌性SVL无显著的线性关系。基于系统发育关系的广义最小二乘(PGLS)分析表明,蜥蜴的产蛋数与母系平均SVL呈正相关。PGLS分析显示,系统发育关系不影响卵窝(或/和卵)质量和SVL,但卵窝(或/和卵)质量与母系平均SVL存在显著的线性关系。因此,我们可以得出一些关于蜥蜴体型和繁殖策略的一般性结论,即体型较大的雌性通常比体型较小的雌性产更多的卵,更大的卵,因此更重的卵。
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