温州厚唇鱼形态特征的两性异形和雌性个体生育力  

Sexual Dimorphism in Morphological Traits and Female Individual Fecundity of Acrossocheilus wenchowensis

作　　者：徐德钦[1] 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4期335-340,共6页Journal of Shanghai Jiaotong University(Agricultural Science)

基　　金：浙江省自然科学基金(No.Y505273);丽水学院科研项目

摘　　要：测定了温州厚唇鱼形态特征的两性异形和雌性个体生育力。结果表明,成体和幼体雌雄两性个体的体长无显著差异。特定体长的雌性幼体的头长、吻长、眼径、腹鳍基前距和体重大于雄性幼体。特定体长的雌性成体的头高和尾柄高小于雄性成体,腹鳍臀鳍间距大于雄性成体。成体和幼体的两性间其他局部特征不存在显著的两性异形。8个形态特征变量的主成分分析(Eigenvalue≥1)发现,前3个主成分共解释65.6%的变异。头长、吻长和腹鳍基前距在第一主成分有较高的正负载系数,尾柄高和体重在第二主成分有较高的正负载系数,腹鳍臀鳍间距在第三主成分有较高的负负载系数。成幼体和雌雄两性之间在第一、第二和第三主成分的分值差异显著性,雌性在第一主成分的分值显著大于雄性,在第三主成分的分值显著小于雄性;第一、二主成分的分值2因素的相互作用显著;其余主成分分值的各因素的影响和相互作用不显著。温州厚唇鱼的怀卵数量与体长和体重回归关系显著。偏相关分析表明,怀卵数量与体重呈显著的正相关,怀卵数量与体长相关不显著。雌性通过个体大小特别是体重的增长来增加个体生育力,提高繁殖输出。We measured the sexual dimorphism in morphological traits and female individual fecundity in a population of Acrossoeheilus wenchowensis, from Oujiang River, Lishui City, Zhejiang Province. Our resuhs showed that there were no sexual dimorphism in the body length jnveniles and adults. The juvenile females with special body length ate significandy larger than juvenile males in head length, snout length, eye diameter, pelvic fin precoxal length and body mass. The adult females with special body length are significandy shorter than adult males in head height and caudal peduncle height. However, adult females have a larger space between pelvic fin and anal fin than adult males. There＇s no significant sexual difference among other morphological traits of juveniles and adults. A principal component analysis resolve three components （with eigenvalues ≥ 1） from eight size （body length）- free morphological variables, accounting for 65.6 % of variation in the original data. The first component （27.9 % variance explained） has high positive loading for slze-free values of head length, snout length and pelvic fin precoxal length, the second component （23.2 % variance explained） has high positive loading for size-free value of caudal peduncle depth and body mass, the third component （14.5 % variance explained） has high negative loading for slze-free value of space between pelvic fin and anal fin. Females had significantly larger scores on the first axis, but had lower scores on the third axis of a principal component analysis than did males. The interaction between the first and the second axis scores were significandy, but not in other major component scores. The individual fecundity is positively correlated with the body length and body mass in A. wenchowensis. When the influence of variation in body length was removed, the individual fecundity is positively correlated with the body mass in A. wenchowensis. However, there＇s no conelation between the individual fecundity and the body length when the

关 键 词：鲤科 巴亚科 温州厚唇鱼 形态 性别比例 两性异形 个体生育力 

分 类 号：Q958[生物学—动物学]