Comparative studies of testicular structure and sperm morphology among copulatory and non-copulatory sculpins (Cottidae : Scorpaeniformes : Teleostei)
Comparative studies of testicular structure and sperm morphology among copulatory and non-copulatory sculpins (Cottidae : Scorpaeniformes : Teleostei)
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交配与非交配杜父鱼睾丸结构和精子形态的比较研究（鲉科：蝎形目：硬骨鱼）
DOI：
10.1007/s10228-010-0196-9
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发表时间：
2011
影响因子：
1.2
通讯作者：
Hiroyuki Munehara
中科院分区：
文献类型：
--
作者：
Yasunori Koya;Youichi Hayakawa;Alexander Markevich;Hiroyuki Munehara
为探讨杜父鱼雄性生殖器官的形态特征与生殖方式（交配或不交配）的关系，对9种杜父鱼的精巢结构和19种杜父鱼的精子头形态进行了观察。根据精子转运和贮存系统的不同，将精巢的形态结构分为以下5种类型：（1）无导管型，其外部无明显的输精管，输精管作为内部结构沿精巢穿行;（3）后管型，前精管沿着睾丸背门，后精管延伸至睾丸后部，（4）前管后囊型，前精管沿睾丸背门沿着延伸，左右精管在睾丸后部融合形成贮精囊;（5）无导管后囊型，其中精子导管不伴随睾丸，并且睾丸和储精囊直接或通过后精子导管连接。一般认为，杜父鱼科的非导管型生殖器官是原始的，而前导管型生殖器官是所有非交配物种所共有的。精巢和伴随的贮精囊仅见于交配种。精子头形态按长宽比分为3种类型：卵圆形≤2，中间型>2且≤3，细长型>3。精子头的类型与生殖方式密切相关，非交配种精子头呈椭圆形，交配种精子头呈中间形或细长形。这些结果表明，杜父鱼精巢的结构和精子头的形态从具有前输精管和卵圆形精子头的精巢进化到具有相关储精囊和细长精子头的精巢，与杜父鱼从非交配生殖到交配生殖的进化有关。
Testicular structure of 9 species and sperm head morphology of 19 species of Cottidae were observed in order to clarify relationships between morphological characteristics of the male reproductive organ and reproductive mode (copulation or non-copulation). Morphological structure of the testis was divided into the following five types based on the sperm transfer and reservoir system: (1) a non-duct type in which the sperm duct is not a distinct exterior structure, but the tube for sperm transport traverses along the testis as an interior structure; (2) an anterior duct type with distinct anterior sperm ducts traversing along the testis; (3) a posterior duct type with distinct anterior sperm ducts traversing along the dorsal hilus of testis and posterior sperm ducts extending to the rear of the testis; (4) an anterior duct posterior vesicle type with distinct anterior sperm ducts traversing along the testis, and the right and left sperm ducts fusing in the rear of testis, forming the seminal vesicle; (5) a non-duct posterior vesicle type in which sperm ducts do not accompany the testis, and the testis and seminal vesicle are connected directly or through posterior sperm ducts. It is thought that in Cottidae the non-duct type of reproductive organ is primitive, and the anterior duct type is common to all non-copulating species. The testes and accompanying seminal vesicle were seen only in copulating species. Sperm head morphology was divided into three types according to the length/width ratio: oval type ≤2, intermediate type >2 and ≤3, and slender type >3. The type of sperm head corresponded closely to the reproductive mode; non-copulating species had oval sperm head, and copulating species had intermediate or slender ones. These results suggest that the structure of the testis and the morphology of the sperm head evolved from testes with anterior sperm ducts and oval sperm heads to testes with an associated seminal vesicle and slender sperm heads in association with the evolution from non-copulatory to copulatory reproduction in Cottidae.