摘要
青海沙蜥是分布于青藏高原的卵胎生蜥蜴 ,雌性性成熟的最小 SVL是 5 0 .0 mm.窝卵数 1～ 5枚 ,平均 2 .74± 0 .86枚 (n=2 3) ,常见窝卵数 2～ 3枚 ,窝卵数随 SVL的增加而明显增加 (r=0 .70 30 ,P<0 .0 0 2 ) .单卵干重 0 .10～ 0 .2 0 g,平均 0 .14± 0 .0 0 5 g,随窝卵数的增加而显著变轻 (r=- 0 .70 77,P<0 .0 0 2 ) .窝卵干重 0 .2 0～ 0 .5 5 g,平均 0 .38± 0 .0 0 7g,随窝卵数和 SVL的增加而增加 (r=0 .8730 ,P<0 .0 0 1;r=0 .8776,P<0 .0 0 1) .与其卵生的近缘种相比 ,青海沙蜥雌性发育缓慢 ,性成熟较晚 ,年产单窝和较多窝卵数 .其生殖对策及进化是高寒环境选择的结果 .
Phrynocephalus vlangalii is only encountered in QinghaiXizang Plateau to be an endemic species of China.The lizard is ovoviviparous species.Its female reproduction was investigated at Yanchiwan,Subei County,Gansu Province in July 2000.This paper dealt with the female reproductive strategy and its evolution of the lizard.A snoutvent length (SVL) of 50 mm was selected as the minimum size for sexual maturity of the female.Its clutch size was from 1 to 5,averaging 2.74±0.86 (n=23). The common clutch size was 2～3 eggs.The number of young produced per female was dependent on body size of the female.This relationship between numbers of eggs and females SVL was highly significant (r=0.703 0,P<0.002,n=23).Single egg dry weight was 0.10～0.20 g,averaging 0.14±0.005 g,and was negative relative with clutch size(r=-0.707 7,P<0.002).Brood egg dry weight ranged from 0.20 to 0.55 g,averaging 0.38±0.007 g.There was positive significant correlation between brood egg weight and SVL(r=0.877 6,P<0.001),and clutch size (r=0.873 0,P<0.001).Comparison with its relative oviparous lizards,Phrynocephalus vlangalii produced only one brood a year and developed more slowly,age at maturity was greater and its clutch size was more.Its reproductive strategy and evolution was the result of the selection of alpine enviroment.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2002年第6期99-103,共5页
Journal of Lanzhou University(Natural Sciences)
基金
国家自然科学基金资助项目 (395 70 0 97) .
关键词
青海沙蜥
雄性
生殖对策
进化
Phrynocephalus vlangalii
female
reproductive strategy
evolution
