Arezo M J, D'Alessandro S, Papa N, de Sá R, Berois N
Biología Celular, Facultad de Ciencias, Universidad de la República, Iguá 4225, Montevideo 11400, Uruguay.
Tissue Cell. 2007 Apr;39(2):89-98. doi: 10.1016/j.tice.2007.01.004. Epub 2007 Mar 30.
Sex differentiation process, determination of sexual strategy, and gametogenesis of the annual fish Austrolebias charrua are established. Evidence of histological sex differentiation in an antero-posterior gradient was observed in pre-hatching stages. Sexual strategy corresponds to the "differentiated gonochoric" pattern. Histological analyses of adult gonads showed an asynchronous spawning mode for females and continuous spawning for males. Mature oocytes presented fluid yolk. Testis organization corresponded to a restricted spermatogonial model. Herein, we report the ultrastructural organization of the vitelline envelope and the main features of the sperm of A. charrua. Taking together these results also contribute to phylogenetic studies and provide base line data to propose A. charrua as a biomonitor of contamination in a protected area.
一年生鱼类奥氏南美鳉的性别分化过程、性策略的确定以及配子发生已被明确。在孵化前阶段观察到了沿前后梯度的组织学性别分化证据。性策略对应于“分化雌雄异体”模式。成年性腺的组织学分析表明，雌性为异步产卵模式，雄性为连续产卵模式。成熟卵母细胞呈现出液状卵黄。睾丸组织对应于一种受限的精原细胞模型。在此，我们报告了奥氏南美鳉卵黄膜的超微结构组织以及精子的主要特征。综合这些结果也有助于系统发育研究，并为将奥氏南美鳉提议作为保护区污染生物监测指标提供基线数据。
