不同近交程度对三疣梭子蟹(Portunus trituberculatus)繁殖性能的影响

Effects of Different Inbreeding Degree on Reproductive Performance of Swimming Crab (Portunus trituberculatus)

中文关键词: 近交  三疣梭子蟹  家系  繁殖

英文关键词: Inbreeding  Portunus trituberculatus  Family  Reproduction

中文摘要:

      以本实验室建立的三疣梭子蟹(Portunus trituberculatus)全同胞家系为研究对象，通过连续观测6代三疣梭子蟹近交家系的抱卵量、排幼量、孵化率、单位体重抱卵量、单位体重排幼量及幼体发育各阶段的变态率6个指标来评价近交对三疣梭子蟹繁殖性能的影响。方差分析显示，在实验亲蟹的规格大小对测量数据无影响的条件下，近交系数每增加10%，各近交代与非近交代F1m在单位体重抱卵量与单位体重排幼量的差异不显著(P>0.05)，这2个指标的近交衰退系数分别为–2.789% ~ –6.620%和–1.188% ~ –5.938%；孵化率的差异也不显著(P>0.05)，衰退系数为–1.859% ~ –7.222%，表明没有明显的近交衰退；由溞状幼体(Z)阶段、大眼幼体(M)阶段到Ⅱ期幼蟹阶段的变态率变化趋势可知，随着近交代数的增加，各阶段的变态率呈下降趋势。

英文摘要:

      This study investigated the effects of inbreeding on the reproductive performance of swimming crab Portunus trituberculatus, by comparing reproductive traits, including fecundity, egg production, fecundity per unit body weight, egg production per unit body weight, hatchability and metamorphosis rate, in full-sib families of six generations (F1m to F6m). The results showed that the range of inbreeding depression coefficients were –2.789% ~ –6.620%, –1.188% ~ –5.938% and –1.859% ~ –7.222% for fecundity per unit body weight, egg production per unit body weight and hatching rate, respectively, and there was no significant inbreeding depression in these three traits (P > 0.05). As inbreeding level increased, metamorphosis rate from zoea Ⅰ to juvenile crab Ⅱ presented a downward trend.