摘要
丽水分布的中国石龙子 ( Eumeceschinensis)摄入的食物均为无脊椎动物 ,分别属于环节、软体和节肢动物 ,涉及 3 0余科。成体和幼体的食物生态位宽度分别为 7.2 6和 6.69,成体和幼体的食物生态位重叠度为 0 .59。性成熟雄性个体大于雌体。成雄和幼体的头长和头宽随体长 SVL的增长速率大于成雌 ,成雄头长随 SVL的增长速率显著大于幼体 ,成雌和幼体的头长随 SVL的增长速率无显著差异。成雄头部大于成雌 ,幼体特定 SVL的头长大于成雌。雌性性成熟个体的最小 SVL为 88.1 mm,大于此 SVL的雌体在繁殖期内均产单窝卵 ,产卵起讫时间为 5月 3 1日～ 6月 2 8日。窝卵数为 9～ 2 5(平均 1 5.3 )枚 ,窝卵重为 5.2 0～ 1 8.98(平均 1 0 .4 9) g,相对窝卵重为 0 .1 88～ 0 .4 3 8(平均 0 .3 2 7)。窝卵数和窝卵重与雌体 SVL呈正相关 ,卵长径与短径呈正相关 ,卵长径和短径与窝卵数无显著的相关性 ,卵大小与窝卵数无显著的相关性 ,卵大小与雌体 SVL呈正相关。
Eumeces chinensis from a Lishui population consumed a broad range of annelid, molluscan and arthropod invertebrates covering more than 30 families. Food niche breadth was 7.26 for adults and 6.69 for juveniles. Food niche overlap between adults and juveniles was 0.59. Males were the larger sex in E. chinensis. Head size(head length and head width)increased more rapidly with SVL in adult males and juveniles than in adult females. Adult males had larger heads than did adult females juveniles had large size(SVL) specific head length than did adult females. The smallest female that could lay eggs in our sample was 88.1 mm SVL, and all females surpassing this size produced a single clutch per breeding season. Egg laying occurred between 31 May and 28 June. Clutch size and clutch mass varied from 9 to 25 (mean=15 3) and from 5.20 to 18.98g (mean=10.49g), respectively. Relative clutch mass varied from 0.188 to 0.438 (mean=0.327).Clutch size and mass and egg size were positively correlated with female SVL. The increase of egg length was accommodated by an increase of egg width. Egg length, egg width and egg size were independent of clutch size. Females increased reproductive output through increasing clutch size(hence clutch mass)and egg size.
出处
《生态学报》
CAS
CSCD
北大核心
2000年第2期304-310,共7页
Acta Ecologica Sinica
基金
国家自然科学基金! ( 3 92 70 1 2 4 )
浙江省自然科学基金青年人才专项基金
关键词
中国石龙子
食性
两性异形
雌性繁殖
Eumeces chinensis
food habits
sexual dimorphism
female reproduction
