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蒙绍权,贝永建,李桂芬,吴德峰,祁保民.2016.版纳鱼螈胚胎和幼体鳃的退化观察.动物学杂志,51(2):221-227.
版纳鱼螈胚胎和幼体鳃的退化观察
Degenerative Characteristics by Observation of the Gills of Ichthyophis bannanicus
投稿时间:2015-09-27  修订日期:2016-02-23
DOI:DOI: 10.13859/j.cjz.201602008
中文关键词:  两栖纲  蚓螈  版纳鱼螈    退化
英文关键词:Amphibian  Caecilian  Branchia  Degeneration  Loss
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
蒙绍权 福建农林大学 福州 350002玉林师范学院 玉林 537000 msq2008@126.com 
贝永建 玉林师范学院 玉林 537000  
李桂芬 玉林师范学院 玉林 537000  
吴德峰 福建农林大学 福州 350002 zj99289@yeah.net 
祁保民 福建农林大学 福州 350002  
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中文摘要:
      为了解版纳鱼螈(Ichthyophis bannanicus)胚胎和幼体鳃的退化特征,同窝8枚胚胎成熟阶段早期的卵被随机取出剖产;随后余下的9枚卵,在胚胎成熟阶段晚期时孵出或剖产,观察幼体或胚胎鳃的变化。结果显示,成熟阶段早期的胚胎,初时其鳃色鲜红,鳃枝充盈,鳃丝与鳃轴近乎垂直;随后鳃色发白,鳃枝疲软,鳃丝卷曲,鳃丝与鳃轴夹角变小。成熟阶段晚期的胚胎和刚孵出的幼体,初时其鳃色纯白,鳃枝疲软,鳃丝卷曲,鳃丝与鳃轴夹角较小;随后逐渐脱落。结果表明,版纳鱼螈胚胎或幼体鳃的退化模式不是重吸收,不是既重吸收也脱落,而仅为脱落;退化过程经历外鳃供血减少-供血停止-鳃枝组织死亡和脱落三个阶段,有明显的外部形态征兆;胚胎进入成熟阶段后,越早孵化,鳃枝留存越多,反之,鳃枝留存越少;发白后的鳃枝随机性脱落。
英文摘要:
      In order to make clear the degenerative characteristics of gill external morphology in Ichthyophis bannanicus, 8 eggs at early stage of mature embryo were picked out randomly from the same clutch and the larvae were released from the capsule. Soon afterwards the left 9 eggs were monitored at late stage to observe the changes of gills before and after hatching. At early stage of mature embryo, initially embryonic gills (Fig. 1a) were red and inflated, filaments at almost right angle to gill axis; afterwards, the gill rami (Fig. 1b) were paled and the filaments turned curled and the angle between filament and gill axis smaller. At late stage of mature embryo and at the outset of newly born larvae, at the start the gill rami (Fig. 1c, d) were white, soft, filaments curled, angles smaller between filament and axis; subsequently, the gill ramus (Fig. 1e) striped off gradually. The result showed that the mode of the gills degeneration was not resorption, nor resorption with stripping, but only stripping, that obvious signs of external morphological changes can be seen during the degeneration process which includes 3 steps: less blood supply, halt of blood supply as well as death and stripping of gill rami and that at late stage of mature embryo, earlier hatching, more gill rami, otherwise, less rami will be kept and paled gill rami will fall off randomly.
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