Sex differentiation pattern in the annual fish Austrolebias charrua (Cyprinodontiformes: Rivulidae)
Sex differentiation pattern in the annual fish Austrolebias charrua (Cyprinodontiformes: Rivulidae)
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DOI：
10.1016/j.tice.2007.01.004
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发表时间：
2007-04-01
期刊：
影响因子：
2.6
通讯作者：
Berois, N.
中科院分区：
文献类型：
--
作者：
Arezo, M. J.;D'Alessandro, S.;Berois, N.
建立了一年生鱼澳小鳞鱼的性别分化过程、性策略的确定和配子发生的研究。在孵化前阶段，观察到组织学性别分化的前后梯度的证据。性策略对应于“差异化的生殖器分布”模式。成体性腺的组织学分析表明，一个异步产卵模式的女性和男性连续产卵。成熟卵母细胞呈液性卵黄。睾丸组织符合限制性精原细胞模型。在此，我们报告了卵黄囊的超微结构组织和精子的主要特征。charrua。综合这些结果也有助于系统发育研究，并提供基线数据，提出了A。charrua作为一个生物监测污染的保护区。(C)2007爱思唯尔有限公司版权所有。
Sex differentiation process, determination of sexual strategy, and gametogenesis of the annual fish Austrolebiascharrua 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. (C) 2007 Elsevier Ltd. All rights reserved.