安徽省宣州扬子鳄饲养种群繁殖现状分析

ANALYSIS ON REPRODUCTION OF CAPTIVE POPULATION OF ALLIGATOR SINENSIS IN XUANZHOU, ANHUI

对１９９３ ～１９９８ 年安徽省扬子鳄繁殖研究中心内的亲代与子代鳄的繁殖情况进行了统计研究，结果表明：扬子鳄亲代卵的平均受精率为（７５．６６±２．２９） ％ ，子一代为（６９ ．２４ ±５ ．１２） ％ ，经ｔ 检验，两者差异显著；亲代产卵孵化幼鳄的平均畸形率为（０．３０ ±０．２０） ％ ，而子一代产卵幼鳄平均畸形率为（１ ．８５±０．９５） ％ ，经ｔ 检验，两者差异显著．但受精卵幼鳄孵化率在两代间差异不显著．通过饲养种群的家系和有效群体大小分析，作者认为造成子代鳄的繁殖率下降和畸形率上升的原因与近亲繁殖有关．对扬子鳄的遗传保护研究提出了建议．

The reproduction rates of captive population of Chinese alligator ( Alligator sinensis ) were analyzed in the preiod from 1993 to 1998. The results showed that the mean fertilization rate was (75.66±2.29)% in the parent generation and (69.24±5.12)% in the first filial generation. The difference between them was significant by t test. The mean rate of malformed hatchling was (0.30±0.20)% in the parent generation and (1.85±0.95)% in F 1, which differed from each other significantly by t test. However, there was no difference in the mean hatching rate between the two generations. Based on the analysis of pedigree and effective population size of the captive breeding population of Alligator sinensis in Xuanzhou, The authors think that the decline of the reproduction rate and increase of malformed hatchling should be probably attributed to inbreeding. The genetic conservation research of Alligator sinensis is proposed in this paper.