似刺鳊鮈的两性异形和雌性个体生育力  

Sexual Dimorphism and Female Individual Fecundity of Paracanthobrama guichenoti

作　　者：林植华[1] 雷焕宗[1] 

机构地区：[1]丽水学院生物系,丽水323000

出　　处：《上海交通大学学报（农业科学版）》2006年第2期138-142,共5页Journal of Shanghai Jiaotong University(Agricultural Science)

基　　金：浙江省自然科学基金(Y505273)资助项目;丽水学院重点教改项目

摘　　要：测定了似刺鳊鮈成体的两性异形和雌性个体生育力。结果表明,雌性个体的体长显著大于雄性个体。特定体长的雌性个体的头长、眼后头长、眼径显著小于雄性个体,眼间距、体高、腹鳍基前距大于雄性个体,其他的局部特征不存在显著的两性异形。成体15个形态特征变量的主成分分析(Eigenvalue≥1)发现,前二个主成分共解释55.4%的变异。头长、头宽和眼后头长在第一主成分有较高的正负载系数,体高在第二主成分有较高的正负载系数。雌雄两性在第一和第二主成分的分值差异显著。似刺鳊鮈的怀卵数量与体长和体重回归关系显著,雌性通过个体的增长增加其个体生育力。We measured the sexual dimorphism and female individual fecundity in a population of Paracanthobrama guichenoti, from Oujiang river, Lishui city, Zhejiang province. Our results show the body length of adult females is significantly larger than that of adult males. The adult females with speeial body length are significantly shorter than adult males in head length, postorbital head length and eye diameter.The females are larger than adult males in interorbital width,body depth and pelvic fin preeoxal length. There doesn＇t exist apparent sexual difference among other morphological traits. A principal component analysis resolve two components （with eigenvalues≥ 1） from fifteen size （body length）-free morphological variables, aoeounting for 55.4 % of variation in the original data. The first eomponent （31.8 % variance explained） has high positive loading for size-free values of head length, head width and postorbital head length, the seeond eomponent （23.6 % variance explained） has high positive loading for size-free value of body depth. The scores on the first and seeond axis of a principal component analysis differ significantly .between adult females and adult males. The individual fecundity of P. guichenoti is positively correlated with the body length and body mass. That adult females increase the individual fecundity through increasing the individual size.

关 键 词：似刺鳊鮈 性别比例 两性异形 个体生育力 

分 类 号：Q958[生物学—动物学]